Iso 286-1 (Limites y Ajustes)

INTERNATIONAL

STANDARD

IS0 286-l First edition 1988-09-15

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEXJJYHAPOAHAR OPTAHM3A~Mfl f-t0 CTAHflAPTM3A~MM

IS0 system

of limits

Part I : Bases of tolerances,

and fits deviations

Syst&me IS0 de tokkances et d’ajustements Partie 7: Base des tokances,

harts

and fits

-

et ajustements

Reference number IS0 286-l : 1988 (E) © ISO 2009 - This is a single-user license for personal use only. All other uses prohibited.

Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (is0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. This part of IS0 286 has been prepared by ISO/TC 3, Limits and fits, and, together with IS0 286-2, completes the revision of ISO/R 286, /SO system of limits and fits. ISO/R 286 was first published in 1962 and subsequently confirmed in November 1964; it was based on ISA Bulletin 25 first published in 1940. The major changes incorporated

in this part of IS0 286 are as follows:

a) The presentation of the information has been modified so that IS0 286 can be used directly in both the design office and the workshop. This has been achieved by separating the material dealing with the bases of the system, and the calculated values of standard tolerances and fundamental deviations, from the tables giving specific limits of the most commonly used tolerances and deviations. b) The new symbols js and JS replace the former symbols js and Js (i.e. s and S are no longer placed as subscripts) to facilitate the use of the symbols on equipment with limited character sets, e.g. computer graphics. The letters “s” and “S” stand for “symmetrical deviation”. c) Standard tolerances and fundamental deviations have been included for basic sizes from 500 to 3 150 mm as standard requirements (these were previously included on an experimental basis only). d)

Two additional standard tolerance grades, IT17 and IT18, have been included.

e) Standard tolerance grades IT01 and IT0 have been deleted from the main body of this part of IS0 286, although information on these grades is given in annex A for users who may have a requirement for such grades. f)

Inch values have been deleted. aligned

9) The principles, terminology and symbols bY contemporary

required

technology.

Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated.

0

International

Organization

for Standardization,

1988

0

Printed in Switzerland

© ISO 2009 - This is a single-user license for personal use only. All other uses prohibited.

ii

ISO286-1:1988

EI

Contents Introduction.

.......................................................

1

Scope .............................................................

1

Field of application

1

..................................................

References .........................................................

1

Terms and definitions ................................................

2

Symbols, designation and interpretation of tolerances, deviations .......................................................... andfits..

6

.............................................

9

6

Graphical representation

7

Reference temperature ...............................................

10

8

Standard tolerances for basic sizes up to 3 150 mm. ......................

10

9

Fundamental deviations for basic sizes up to 3 150 mm ...................

10

Bibliography ........................................................

16

IO

Annexes A

Bases of the IS0 system of limits and fits ...............................

17

B

Examples of the use of IS0 286-l .......................................

23

C

Equivalentterms

....................................................


24

. .. III

This page intentionally

left blank


INTERNATIONAL

IS0 system

of limits

Part 1: Bases of tolerances, 0

IS02864

STANDARD

and fits deviations

Introduction

: 1988 (E)

and fits 2

Field of application

The need for limits and fits for machined workpieces was brought about mainly by the inherent inaccuracy of manufacturing methods, coupled with the fact that “exactness” of size was found to be unnecessary for most workpieces. In order that function could be satisfied, it was found sufficient to manufacture a given workpiece so that its size lay within two permissible limits, i.e. a tolerance, this being the variation in size acceptable in manufacture.

The IS0 system of limits and fits provides a system tolerances and deviations suitable for plain workpieces.’

Similarly, where a specific fit condition is required between mating workpieces, it is necessary to ascribe an allowance, either positive or negative, to the basic size to achieve the required clearance or interference, i.e. a “deviation”.

In particular, the general term “hole” or “shaft” can be taken as referring to the space contained by (or containing) the two parallel faces (or tangent planes) of any workpiece, such as the width of a slot or the thickness of a -key.

With developments in industry and international trade, it became necessary to develop formal systems of limits and fits, firstly at the industrial level, then at the national level and later at the international level.

The system also provides for fits between mating cylindrical features or fits between workpieces having features with parallel faces, such as the fit between a key and keyway, etc.

This International Standard therefore gives the internationally accepted system of limits and fits. Annexes A and B give the basic formulae and rules necessary for establishing the system, and examples in the use of the standard are to be regarded as an integral part of the standard.

For simplicity and also because of the importance of cylindrical workpieces of circular section, only these are referred to explicitly. It should be clearly understood, however, that the tolerances and deviations given in this International Standard equally apply to workpieces of other than circular section.

NOTE - It should be noted that the system is not intended to provide fits for workpieces with features having other than simple geometric forms. For the purposes of this part of IS0 286, a simple geometric form consists of a cylindrical surface area or two parallel planes.

3 Annex C gives a list of equivalent terms used in IS0 286 and other International Standards on tolerances.

References

NOTE - See also clause 10.

IS0 1, Standard reference measurements.

1 Scope This part of IS0 286 gives the bases of the IS0 system of limits and fits together with the calculated values of the standard tolerances and fundamental deviations. These values shall be taken as authoritative for the application of the system (see also clause A. 1). This part of IS0 286 also gives terms and definitions together with associated symbols.

of

temperature

for industrial

length

IS0 286-2, IS0 system of limits and fits - Part 2: Tables of standard tolerance grades and limit deviations for holes and shafts. IS01 R 1938, IS0 system of limits and fits - Inspection of plain workpieces. 1) IS0 8015, Technical principle.

drawings

-

Fundamental

tolerancing

1) At present under revision.


1

Is0 286-1 : 1988 E)

4

Terms and definitions

4.5

For the purposes of this International Standard, the following terms and definitions apply. It should be noted, however, that some of the terms are defined in a more restricted sense than in common usage.

zero line: In a graphical representation of limits and fits, the straight line, representing the basic size, to which the deviations and tolerances are referred (see figure 7).

According to conventio n, the zero line is drawn horizontally, with positive deviations shown above and negative deviations below (see figure 2).

4.1

shaft: A term used, according to convention, to describe an external feature of a workpiece, including features which are not cylindrical (see also clause 2).

4.1.1 basic shaft: Shaft chosen as a basis for a shaft-basis system of fits (see also 4.11.1). Zero line (4.5)

For the purposes of the IS0 system of limits and fits, a shaft the upper deviation of which is zero. ti zf

4.2

hole : A term used, according to convention, to describe an internal feature of a workpiece, including features which are not cylindrical (see also clause 2).

.-w cn .a0 8 M :

4.2.1 basic hole: Hole chosen as a basis for a hole-basis system of fits (see also 4.11.2).

Es

For the purposes of the IS0 system of limits and fits, a hole the lower deviation of which is zero.

4.3

size : A number expressing, in a particular numerical value of a linear dimension.

unit, the

4.3.1 basic size; nominal size: The size from which the limits of size are derived by the application of the upper and lower deviations (see figure 1). NOTE - The basic size can be a e.g. 32; 15; 8,75; 0,5; etc.

4.3.2 actual measurement.

size:

or a

The size of a feature,

number,

obtained

by

4.3.2.1 actual local size: Any individual distance at any cross-section of a feature, i.e. any size measured between any two opposite points. 4.3.3 limits of size: The two extreme permissible sizes of a feature, between which the actual size should lie, the limits of size being included. 4.3.3.1 maximum limit of size: size of a feature (see figure 1).

The greatest permissible

limit system: deviations.

Basic size, and maxim urn and minimum limits of size

4.6

deviation: The algebraic difference between a size (actual size, limit of size, etc.) and the corresponding basic size.

NOTE - Symbols for shaft deviations are lower case letters (es, ei) and symbols for hole deviations are upper case letters (Es, EI) (see figure 2).

4.6.1

limit deviations

: Upper deviation and lower deviation.

4.6.1.1 upper deviation (ES, es) : The algebraic difference between the maximum limit of size and the corresponding basic size (see figure 2). 4.6.1.2 lower deviation (EL ei) : The algebraic difference between the minimum limit of size and the corresponding basic size (see figure 2). 4.6.2 fundamental deviation: For the purposes of the IS0 system of limits and fits, that deviation which defines the position of the tolerance zone in relation to the zero line (see figure 2). NOTE - This may be either the upper or lower deviation, but, according to convention, the fundamental deviation is the one nearest the zero line.

4.3.3.2 minimum limit of size : The smallest permissible size of a feature (see figure 1).

4.4

Figure 1 -

A system of standardized tolerances and

4.7

size tolerance: The difference between the maximum limit of size and the minimum limit of size, i.e. the difference between the upper deviation and the lower deviation. NOTE - The tolerance is an absolute value without sign.


2

IS0 286-l I 1988 E)

-

Lower deviation (EI, ei 1 (4.6.1.2)

+

r

Tolerance zone (4.7.3)

Clearance (4.8)

tolerance (4.7)

5 P 0

l -

I

0 z .-

2 n

-

Zero line (4.5) A

(ES, es) (4.6.1.1) ,~ w

T

-Fti s .-8cn .-0 Ei m

Figure 2 - Conventional tolerance

representation zone

4.7.1 standard tolerance (IT) : For the purposes of the IS0 system of limits and fits, any tolerance belonging to this system. NOTE - The letters of the symbol Tolerance” grade.

Figure 3 - Clearance

of a

IT stand for “International

4.7.2 standard tolerance grades: For the purposes of the IS0 system of limits and fits, a group of tolerances (e.g. IJ7), considered as corresponding to the same level of accuracy for all basic sizes. 4.7.3 tolerance zone : In a graphical representation of tolerances, the zone, contained between two lines representing the maximum and minimum limits of size, defined by the magnitude of the tolerance and its position relative to the zero line (see figure 2).

4.8.1 minimum clearance: In a clearance fit, the positive difference between the minimum limit of size of the hole and the maximum limit of size of the shaft (see figure 4). 4.8.2 maximum clearance: In a clearance or transition fit, the positive difference between the maximum limit of size of the hole and the minimum limit of size of the shaft (see figures 4 and 5).

4.9

interference : The negative difference between the sizes of the hole and the shaft, before assembly, when the diameter of the shaft is larger than the diameter of the hole (see figure 6).

4.9.1 minimum interference: In an interference fit, the negative difference, before assembly, between the maximum limit of size of the hole and the minimum limit of size of the shaft (see figure 7).

4.7.4 tolerance class: The term used for a combination of fundamental deviation and a tolerance grade, e.g. h9, D13, etc. 4.7.5 standard tolerance factor (i, I): For the purposes of the IS0 system of limits and fits, a factor which is a function of the basic size, and which is used as a basis for the determination of the standard tolerances of the system. NOTES 1 The standard tolerance factor i is applied to basic sizes less than or equal to 500 mm. 2 The standard tolerance factor I is applied to basic sizes greater than 500 mm.

. AC4 s

1 I

ti ii 5 a z E

ci 06 5

.-i .;

4.8

clearance: The positive difference between the sizes of the hole and the shaft, before assembly, when the diameter of the shaft is smaller than the diameter of the hole (see figure 3).

Figure 4 - Clearance


fit

3

IS0 286-1 : 1988 (E)

r

Maximum clearance (4.8.2)

Maximum interference (4.9.2)

1

Maximum interference ‘-1

Figure 5 - Transition

Interference

Figure 7 -

2

fit

Minimum interference

I-

fit

4.10.1 clearance fit: A fit that always provides a clearance between the hole and shaft when assembled, i.e. the minimum size of the hole is either greater than or, in the extreme case, equal to the maximum size of the shaft (see figure 8).

Interference (4.9) Hole

Hole

Shaft Shaft

Figure 8 - Schematic

Figure 6 -

Interference

representation

of clearance

fits

4.10.2 interference fit: A fit which everywhere provides an interference between the hole and shaft when assembled, i.e. the maximum size of the hole is either smaller than or, in the extreme case, equal to the minimum size of the shaft (see figure 9). Shaft

4.9.2 maximum interference: In an interference or transition fit, the negative difference, before assembly, between the minimum limit of size of the hole and the maximum limit of size of the shaft (see figures 5 and 7).

Shaft

4.10

fit: The relationship resulting from the difference, before assembly, between the sizes of the two features (the hole and the shaft) which are to be assembled. NOTE - The two mating parts of a fit have a common basic size.


.

Hole

representation


4

Zero line

t Hole

of interference

fits

IS0 286-l : 1988 (El

4.11.2 hole-basis. system of fits : A system of fits in which the required clearances or interferences are. obtained by associating shafts of various tolerance classes with holes of a single tolerance class.

4.103 transition fit: A fit which may provide either a clearance or an interference between the hole and shaft when assembled, depending on the actual sizes of the hole and shaft, i.e. the tolerance zones of the hole and the shaft overlap completely or in part (see figure IO).

.Hole . .

For the purposes of the IS0 system of limits and fits, a system of fits in which the minimum limit of size of the hole is identical to the basic size, i.e. the lower deviation is zero (see figure 12).

Shaft

Zero line


representation

of transition

,

fits

4.10.4 variation of a fit: The arithmetic sum of the tolerances of the two features comprising the fit. NOTE - The variation of a fit is an absolute value without sign.

4.11 fit system : A system of fits comprising holes belonging to a limit system.

shafts and

4.11.1 shaft-basis system of fits: A system of fits in which the required clearances or interferences are obtained by associating holes of various tolerance classes with shafts of a single tolerance class. For the purposes of the IS0 system of limits and fits, a system of fits in which the maximum limit of size of the shaft is identical to the basic size, i.e. the upper deviation is zero (see figure I I).

-

Basic size (4.3.1)

NOTES 1 The horizontal continuous ations for holes or shafts.

lines represent the fundamental

devi-

2 The dashed lines represent the other limits and show the possibility of different combinations between holes and shafts, related to their grade of tolerance (e.g. H6/ h6, H6/js5, H6/p4).

Figure 12 -

Hole-basis

system

of fits

4.12

maximum material limit (MML): The designation applied to that of the two limits of size which corresponds to the maximum material size for the feature, i.e.

- the maximum feature (shaft),

Shaft “h”

(upper) limit of size for an external

- the minimum (lower) limit of size for an internal feature (hole). NOTE -

L Basic size (4.3.1)

4.13

least material limit (LMLI : The designation applied to that of the two limits of size which corresponds to the minimum material size for the feature, i.e.

NOTES 1 The horizontal continuous ations for holes or shafts.

Previously called “GO limit”.

lines represent the fundamental

devi-

2 The dashed lines represent the other limits and show the possibility of different combinations between holes and shafts, related to their grade of tolerance (e.g. G71h4, H6/h4, M5/h4).

Figure 11 - Shaft-basis

system

of fits

- the minimum (lower) limit of size for an external feature (shaft), - the maximum (upper) limit of size for an internal feature (hole). NOTE - Previously called “NOT GO limit”.


5

IS0 286-1 : 1988 (E)

5 Symbols, designation of tolerances, deviations 5.1

and interpretation and fits

Examples : 32H7 8OjsI5 10096 -0 012 IO0 -0:034

Symbols

5.1 .l

Standard

tolerance

grades

The standard tolerance grades are designated by the letters IT followed by a number, e.g. IJ7. When the tolerance grade is associated with (a) letter(s) representing a fundamental deviation to form a tolerance class, the letters IT are omitted, e.g. h7. NOTE - The IS0 system provides for a total of 20 standard tolerance grades of which grades IT1 to IT18 are in general use and are given in the main body of the standard. Grades IT0 and ITOl, which are not in general use, are given in annex A for information purposes.

- In order to distinguish between holes and ATTENTION shafts when transmitting information on equipment with limited character sets, such as telex, the designation shall be prefixed by the following letters:

-

H or h for holes;

-

S or s for shafts.

Examples : 5OH5 becomes H5OH5 or h5Oh5 5Oh6 becomes S5OH6 or s5Oh6

5.1.2

Deviations

5.1.2.1

This method drawings.

Position of tolerance zone

The position of the tolerance zone with respect to the zero line, which is a function of the basic size, is designated by (an) upper case letter(s) for holes (A . . . ZC) or (a) lower case letter(s) for shafts (a . . . zc) (see figures I3 and 14).

5.2.3

designation

shall

not

be

on

Fit

A fit requirement between mating features shall be designated bY

NOTE - To avoid confusion, the following letters are not used :

a)

the common basic size;

b) the tolerance class symbol for the hole;

I, i; L, I; 0, 0; Q, q; W, w.

c) 5.1.2.2

of

the tolerance class symbol for the shaft.

Upper deviations Examples :

The upper deviations are designated by the letters “ES” holes and the letters “es” for shafts. 5.1.2.3

Lower deviations

The lower deviations are designated by the letters “El” holes and the letters “ei” for shafts.

5.2

for

for

Ii7 52H7lg6 or 52 96 - In order to distinguish between the hole and ATTENTION the shaft when transmitting information on equipment with limited character sets, such as telex, the designation shall be prefixed by the following letters:

Designation

5.2.1

Tolerance

class

A tolerance class shall be designated by the letter(s) representing the fundamental deviation followed by the number representing the standard tolerance grade.

H7 (holes) h7 (shafts) Toleranced

H or h for holes;

-

S or s for shafts;

-

and the basic size repeated.

Examples : 52H7/g6 becomes H52H7/S52G6 This method drawings.

Examples :

5.2.2

-

5.3 5.3.1

size

A toleranced size shall be designated by the basic size followed by the designation of the required tolerance class, or the explicit deviations.

of

designation

Interpretation Tolerance

or h52h7/s52g6 shall

of a toleranced

indication

not

be

used

on

size

in accordance

with

IS0 8015

The tolerances for workpieces manufactured to drawings marked with the notation, Tolerancing IS0 8015, shall be interpreted as indicated in 5.3. I. I and 5.3.1.2.


Is0 286-I : 1988 (El

a)

Holes (internal features)

b)

Shafts (external features)

2

.-0 .-z $ u 5 E

E 3 z

NOTES I

According to convention, the fundamental deviation is the one defining the nearest limit to the zero line.

2

For details concerning fundamental deviations for J/j, K/k, M/m and N/n, see figure 14.


representation

of the positions

of fundamental


deviations

60286-1:1988

E) I

U

N 0 CL

1

P is

L t 0 I---

t 0 a

..

..

CL) l0 z

LLJ l0 z


l-

IS0 286-k

53.1 .I

6

Linear size tolerances

A linear size tolerance controls only the actual local sizes (twopoint measurements) of a feature, but not its form deviations (for example circularity and straightness deviations of a cylindrical feature or flatness deviations of parallel surfaces). There is no control of the geometrical interrelationship of individual features by the size tolerances. (For further information, see ISO/R 1938 and IS0 8015.) 5.3.1.2

Graphical

representation

The major terms and definitions given in clause 4 are illustrated in figure 15. In practice, a schematic diagram such as that shown in figure 16 is used for simplicity. In this diagram, the axis of the workpiece, which is not shown in the figure, according to convention always lies below the diagram. In the example illustrated, the two deviations of the hole are positive and those of the shaft are negative.

Envelope requirement

Single features, whether a cylinder, or established by two parallel planes, having the function of a fit between mating parts, are indicated on the drawing by the symbol @ in addition to the dimension and tolerance. This indicates a mutual dependence of size and form which requires that the envelope of perfect form for the feature at maximum material size shall not be violated. (For further information, see ISO/R 1938 and IS0 8015.)

K zi 8

rr

Upper deviation (4.6.1.1) Lower deviation (4.6.1.2) Hole (4.2)

1

NOTE - Some national standards (which should be referred to on the drawing) specify that the envelope requirement for single features is the norm and therefore this is not indicated separately on the drawing.

53.2 Tolerance IS0 6015

indication

not in accordance

with

The tolerances for workpieces manufactured to drawings which do not have the notation, Tolerancing IS0 6015, shall be interpreted in the following ways within the stipulated length : a)

For holes

The diameter of the largest perfect imaginary cylinder, which can be inscribed within the hole so that it just contacts the highest points of the surface, should not be smaller than the maximum material limit of size. The maximum diameter at any position in the hole shall not exceed the least material limit of size.

Minimum limit of size (4.3.3.2) Maximum limit of size (4.3.3.1)

b)

1988 a(E)

For shafts

Basic size (4.3.1) A

The diameter of the smallest perfect imaginary cylinder, which can be circumscribed about the shaft so that it just contacts the highest points of the surface, should not be larger than the maximum material limit of size. The minimum diameter at any position on the shaft shall be not less than the least material limit of size. The interpretations given in a) and b) mean that if a workpiece is everywhere at its maximum material limit, that workpiece should be perfectly round and straight, i.e. a perfect cylinder. Unless otherwise specified, and subject to the above requirements, departures from a perfect cylinder may reach the full value of the diameter tolerance specified. For further information, see ISO/R 1938. NOTE - In special cases, the maximum form deviations permitted by the interpretations given in a) and b) may be too large to allow satisfactory functioning of the assembled parts: in such cases, separate tolerances should be given for the form, e.g. separate tolerances on circularity and/or straightness (see IS0 1101).

Figure 15 - Graphical

+ 5 ii O.-0 .-% n2 -

Figure 16 - Simplified


representation

Hole

Shaft

schematic

diagram

IS0 286-l : 1988 (El

7

Reference

temperature

9.2

Fundamental

deviations

for holes

[except deviation JS (see 9.311 The temperature at which the dimensions of the IS0 system of limits and fits are specified is 20 OC (see IS0 I).

8 Standard 315Omm 8.1

tolerances

for basic sizes up to

The fundamental deviations for holes and their respective sign ( + or - ) are shown in figure 18. Values for the fundamental deviations are given in table 3. The upper deviation (ES) and lower deviation (H) are established from the fundamental deviation and the standard tolerance grade (IT) as shown in figure 18.

Basis of the system Deviations A to H

The bases for calculating the standard tolerances are given in annex A.

8.2

Values of standard

tolerance

Deviations K to ZC (not valid for tolerance grades less than or equal to IT8 of deviation K and tolerance class M8)

grades (IT)

Values of standard tolerance grades IT1 to IT18 inclusive are given in table 1. These values are to be taken as authoritative for the application of the system.

Zero line

NOTE - Values for standard tolerance grades IT0 and IT01 are given in annex A.

9 Fundamental to315Omm

deviations

9.1

deviations

Fundamental

for basic sizes up

ES = negative ( - 1 fundamental deviation

ES = EI + IT

EI = ES - IT

for shafts

[except deviation js (see 9.3)]

Figure 18 -

The fundamental deviations for shafts and their respective sign ( + or - 1 are shown in figure 17. Values for the fundamental deviations are given in table 2. The upper deviation (es) and lower deviation (ei) are established from the fundamental deviation and the standard tolerance grade (IT) as shown in figure 17.

Deviations a to h

EI = positive (+ 1 fundamental deviation

Deviations k to zc

9.3

Fundamental

deviations

for holes

js and JS

(see figure 19) The information given in 9.1 and 9.2 does not apply to fundamental deviations js and JS, which are a symmetrical distribution of the standard tolerance grade about the zero line, i.e. for js: es = ei = -IT 2 and for JS: ES = EI.=

Zero line

Deviations

IT 2

IT

r ES

r2

es

h w

El es = negative ( - 1 fundamental deviation

ei = positive ( + ) funda-

ei = es - IT

es = ei + IT

Figure 17 -

mental deviation

Deviations

for shafts

.

Shaft

Hole

I

L IT 2

Figure 19 -

Deviations


js and JS

IS0 286-1 : 1988 (EI

9.4

Fundamental

deviations

j and J

The information given in 9.1 to 9.3 does not apply to fundamental deviations j and J, which are, for the most part, asymmetrical distributions of the standard tolerance grade about the zero line (see IS0 286-2, tables 8 and 24). Table 1 - Numerical

values of standard

tolerance Standard

Basic size mm

IT7

-

tolerance

grades

IT8 1 IT8 1 IT10 ] IT11 1 IT12 1 IT13 1lTl43)1 IT153) 1 IT1631 ITl73)I IT1831

I

up to Above

grades IT for basic sizes up to 3 150 mm ‘)

Tolerances

and including

mm

IJm

33)

0,8

I,2

2

3

4

6

10

14

25

40

60

0,l

0,14

0,25

0,4

0,6

3

6

1

1,5

2,5

4

5

8

12

18

30

48

75

0,12

0,18

0,3

0,48

0,75

1,2

I,8

6

10

1

I,5

2,5

4

6

9

15

22

36

58

90

0,15

0,22

0,36

0,58

0;9

I,5

2,2

10

18

I,2

2

3

5

8

11

18

27

43

70

110

0,18

0,27

0,43

0,7

1,1'

I,8

2,7

18

30

I,5

2,5

4

6

9

13

21

33

52

84

130

0,21

0,33

0,52

0,84

I,3

2,l

3,3

30

50

I,5

2,5

4

7

11

16

25

39

62

100

160

0,25

0,39

0,62

1

1,6

2,5

3,9

50

80

2,,

3

5

8

13

19

30

46

74

120

190

0,3

0,46

0,74

1,2

I,9

3

4,6

80

120

2,5

4

6

10

15

22

35

54

87

140

220

0,35

0,54

0,87

I,4

2,2

3,5

5,4-

120

180

3,5

5

8

12

18

25

40

63

100

160

250

0,4

0,63

1

I,6

2,5

4

613

180

250

4,5

7

10

14

20

29

46

72

115

185

290

0,46

0,72

I,15

1,85

2,9

4,6

7,2

250

315

6

8

12

16

23

32

52

81

130

210

320

0,52

0,81

I,3

2,l

3,2

5,2

8,l

315

400

7

9

13

18

25

36

57

89

140

230

360

0,57

0,89

I,4

2,3

3,6

5,7

8,9

d-00

500

8

10

15

20

27

40

63

97

155

250

400

0,63

0,97

1,55

2,5

4

6,3

9,7 ;

500

6302)

9

11

16

22

32

44

70

110

175'

280

440

0,7

I,1

I,75

2,8

4,4

7

11

630

8002)

10

13

18

25

36

50

80

125

200

320

500

0,8

I,25

2

3,2

5

8

12,5

800

10002)

11

15

21

28

40

56

90

140

230

360

560

0,9

I,4

2,3

3,6

5,6

9

14

1000

12502)

13

18

24

33

47

66

105

165

260

420

660

I,05

I,65

2,6

4,2

6,6

IO,5

16,5

1250

16002)

15

21

29

39

55

78

125

195

310

500

780

I,25

I,95

3,l

5

718

12,5

19,5

1600

20002)

18

25

35

46

65

,92

150

230

370

600

920

I,5

2,3

3,7

6

9,2

15

23

2000

25002)

22

30

41

55

78

110

175

280

440

700

1100

1,75

2,8

4,4

7

11

17,5

28

2500

31502)

26

36

50

68

96

135

210

330

540

860

1350

2,l

3,3

5,4

86

13,5

21

33

1

114

-

1) Values for standard tolerance grades IT01 and IT0 for basic sizes less than or equal to 500 mm are given in annex A, table 5. 2)

Values for standard tolerance grades IT1 to IT5 (incl.) for basic sizes over 500 mm are included for experimental use.

3)

Standard tolerance grades IT14to IT18 (incl.) shall not be used for basic sizeslessthan

or equal to 1 mm.


11

IS0 286-l : 1988 E)

Table 2 - Numerical

values of the

Fundamental Basic size

Upper deviation

I

es

mm All standard

al) 1 bl) -

61

- 270 1 -140 - 2801 -150

IO

+-I-+

c

1 -

I .

I I

+-+-I-

3001 -160

95 1

I I

I

I -110

I

40

-

310

-170

-120

40

50

-

320

-180

-130

340

50

65 80

-

cd

70

30

65 I 80 I

1

60 1 -34

I -46 I - 80 I -56 I -

- 2901 -1501-

I I

-190

-140

I-

3601 -200

I -150

I

loo I-

3801 -220

I -170

100 I

120

I-

414

-240

I -180

I I

120

140

I -7i6-l

-260

I

I ~~

I

140 I

160 I-

520 1 -280

160

180

580

-

-200

1 -210

-310

1

180

200 225

I 250 I

250 280

I- 7401-380 I -260 I I- 827 -420 1 -280 1 I-zzl -480 I -300 I

280 I

315

I-105oL5401~3301

-660-340

315

355

-1200

-600

-360

400

-1350

-680

-400

400

450

-1500

-760

-440

450

500

-1650

-840

-480

500

560

560

630

630

710

710

800 900

900 1000 1 120

1000

I

1120 1 250

1250

1400

1400

1600

1600

1800

1800

2000

2000

2240

2240

2500

2500

2800

2800

3 150

I

I

ef

f

e

- 20

-

- 30 -40

-

25

-50

-

32

-

-40

65

-80

-50

-100

-60

-120

-

-145

- 85

72

IT5 and IT6 h 10

-

13

-

16

IT7

IT8

i

6

-18

T

-T-4

t -6

-6 -8

- 25

- 36

-15

-43

-18

-240

355

800

d

grades

- 230

200 I 225

1)

1

2701 -140

tolerance

I

I

-170

-21

-190

-110

-210

-125

-

- 230

-135

-68

-260

-145

-

- 290

-160

-80

- 320

-170

-

86

I

-350

-195

-

98

1 -28

-390

-220

-430

-240

-480

-260

- 520

- 290

62 0

-16

-26

-18

-28

-20

-32

76 -24 -26

-32

c

-34

Fundamental deviations a and b shall not be used for basic sizes less than or equal to 1 mm.

For tolerance classes js7 to jsll, if the IT value number, n, is an odd number, this may be rounded to the even number immediately below, so that the ITn resulting deviations, i.e. + , can be expressed in whole micrometres. 2

2)

12


IS0 286-1 : 1988 E)

fundamental

deviations

of shafts Fundamental deviation values in micrometres

deviation

values Lower deviation

IT4 to IT7

Up to IT3 (incl.) and above IT7 k

0

All standard

t m 0 0 0 0

n +

4

+

+4

+

8

+6

+ 10

+7

r

P

+2

+ 12

6

t

S

U

tolerarke V.

grades

18

+ 20

+

26

+

32

+

40

+

60

+ 12

+ 15

+

19

+

23

+ 28

+

35

+

42

+

50

+

80

+ 15

+ 19

+

23

+

28

+34

+

42

+

52

+

67

+

97

+40

+

50

+

64

+

90

+

130 150

+ 18

+ 23

+

28

+

33

+ 39

+ 45

+

60

+

77

+

108

+

+

41

+47

+54

+

63

+

73

+

98

+

136

+

188

+28

+

357

0

+9

+17

+26

+34

+

43

+41

+

53+66+

+43

+

59

+

75

+51

+

71

+

+54

+

79

+

+63

+

92

+

122

+

170

+202

+248 1 +

300

+

+ 65

+

100

+

134

+

190

+228

+280

+

340

+

+ 68

+

108

+

146

+

210

+252

+310

+

380

+

0

0

0 0 0 0

+ 32

+13

+ 23

+ 37

+I5

+ 27

+ 43

-+-I7

+20 +21 +23 +26

+ 31

+ 34 + 37 +40 +44

zc

+

+22

0

zb

14

+I5

+ 20

_

+

+8

+I1

za

Z

Y

X

+I0

0

0

0

ei

+ 50

+ 56 + 62 r +68, -1-78

0

0

+30

+50

+88

0

0

+34

+56

+lcw

0

+40

+ 66

+I20

0

+48

+78

+140-

0

+58

+ 92

+I70

0

+68

+I10

+I95

0

+76

+I35

+240 '

+

41

+

48

+55

+64

+

75

+

88

+

118

+

160

+

218

+

48

+

60

-1-68

+80

+

94

+

112

+

148

+

200

+

274

+

54

+

70

+ 81

+ 97

+

114

+

136

+

180

+

242

+

325

87

+102

+122

+

144

+

172

+

226

+

300

+

405

+

102

+I20

+I46

+

174

+

210

+

274

+

360

+

480

91

+

124

+I46

+I78

+

214

+

258

+

335

+

445

+

585

104

+

144

+I72

+210

+

254

+

310

+

400

+

525

+

690

365

+

470

+

620

+

800

415

+

535

+

700

+

900

465

+

600

+

780

+I 000

+ 77

+

122

+

166

+

236

+284

+350

+

425

+

520

+

670

+

880

+1150

+ 80

+

130

+

180

+

258

+310

+385

+

470

+

575

+

740

+

960

+I 250

+ 84

+

140

+

196

+

284

+340

+425

+

520

+

640

+

820

+I 050

+l 350

+ 94

+

158

+

218

+

315

+385

+475

+

580

+

710

+

920

+l 200

+I 550

+ 98

+

170

+

240

+

350

+425

+525

+

650

‘+

790

+I000

+I300

+I700

+I08

+

190

+

268

+

390

+475

+590

+

730

+

9o(l

+I‘150

+I 500

+I 900

+114

+

208

+

294

+

435

+530

+660

+

820

+I000

+I300

+I650

+2100

+126

+

232

+

330

+

490

+595

+740

+

920

+I100

+1450

+I850

+2400

+I32

+

252

+

360

+

540

+660

+820

+I000

+1250

+1600

+2100

+2600

+I50

+

280

+

400

+

600

+I55

+

310

+

450

+

660

+I75

+

340

+

500

+

740

+I85

+

380

+

560

+

840

+210

+

430

+

620

+

940

+220

+

470

+

680

+l 050

+250

+

520

+

780

+I 150

+260

+

580

+

840

+I300

+300

+

640

+

960

+I450

+330

+

720

+I050

+370

+

820

+1200

+I850

+400

+

920

+I350

+2000

+440

+I000

+I500

+2300

+460

+I100

+I650

+2500

+550

+I250

+I900

+2900

+580

+I400

+2100

+3200

+I600


13

Is0 286-l : 1988 E)

.

Table 3 - Numerical

values of the

Fundamental Basic size

Lower deviation

mm All standard

1 Upto Icluding(

3

~1)

c

ICDI

D

I

E

IEFI

F

IFGIG

/HI

IT7

IT8

up to IT8 (incl.)

J

JS2)

Above IT8

ulFio

Above IT8

(incl. 1

M3)4)

KS)

+

270

+140

+ 60

+34

+ 20

+ 14

+lO

+

6

+4

+ 2

0

+2+4+6

6

+

270

+140

+ 70

+46

+ 30

+ 20

+'4

+ '0

+6

+ 4

0

+ 5

+ 6

+lO

-'+A

l-4+41

-4

+

280

+'w

+ 80

+56

+ 40

+ 25

+18

+ '3

+8

+ 5

0

+ 5 + 8

+12

-‘+A

-6+A

-6

290

+150

+95

+50

+32

+ 16

+60

+ 6

+lO

+15

-‘+A

-7+-A

-7

+

300

+160

+llO

+65

+40

+20

+7

+ 8

+12

+20

-2+A

-8+A

-8

+80

+50

+lO

+14

+24

-2+A

-9+A

-9

+13

+18

+28

-2+A

-11 +A

-11

+22

+34

-3+A

-13+A

-13

6

10 14

14

18

18

24

24

30

.+

30

40

+

310

+170

+120

40

50

+

320

+180

+130

50

65

+

340

+190

+140

65

80

+

360

+200

+150

80

100

+

380

+220

+170

100

120

+

410

+240

+180

120

140

+

460

+260

+200

140

160

+

520

+280

+210

160

180

+

580

+310

+230

180

200

+

660

+340

+240

200

225

+

740

+380

+260

225

250

+

820

+420

+280

250

280

+

920

+480

+300

280

315

+1050

+540

+330

315 355

355 400

+1200 +1350

+600 +680

+360 +400

400

450

+1500

+760

+440

450

500

+1650

+84O

+480

500

560 630

710

800

800

900

900

1000

1250

1400

1400

1600

1600

1800

1800

2000

2000

2240

2240

2500

2500

2800

2800

13150

I

--

0 -

-

I + 25I I’ gl”l

0

0

I

I

I-21 I

+120

+ 72

+36

+12

0

+16

+145

+85

+43

+14

0

I I I +18 1 +26 1 +41 I-3+4

+170

+lOO

+50

+15

0

+22

+30

-1-47 -4+A

-17+A

-17

+190

+llO

_-

-

--

I 1

I l-15+41

I

-15

I”‘1 oI

+25

+36

+55

-4+A

-rn+A

-20

1 +210 1 +125 1

1 + 62 /

1+181

+29

+39

+60

-4+A

-21 +A

-21

/+23OI+l35I

' . M'

'-nA'A'

+33

+43

+66

-5+A

-23+A

0 1

I’“1 I’“1 “I I +. -A I 1 ,,ILl I /D I II’“1 “I

+260

+145

+290

+160

+80

+24

0

+320

+170

+86

+26

0

I

+220

+430

+240

+120

+32

0

+480

+260

+130

+34

0

a-

a

+520

I

+290

I +-l-lo I l+mlol

A m-

I +1+3 I

I 1

-23

0

-26

0

-30

I II01

- _-

+390

I 1

I

I I I l+3501+‘g51 I+981 I+28101I I loI I I l--l-l

I

l-2

I’“1

710

f+ii+s-l

1)

I

IT6

grades

3'15)

10

560 630

I

1~1)

tolerance

deviation

EI

0

-48

0

-58

I I loI 0

-68 -76

Fundamental deviations A and B shall not be used for basic sizes less than or equal to 1 mm.

For tolerance classes JS7 to JSll, if the IT value number, n, is an odd number, this may be rounded to the even number immediately below, so that the ITn resulting deviations, i.e. + -, can be expressed in whole micrometres. 2

2)

3) For determining the values K, M and N for standard tolerance grades up to IT8 (incl.) and deviations P to ZC for standard tolerance grades up to IT7 (incl.), take the d values from the columns on the right.

14


ISO286-1 :1988 E)

fundamental

deviations

of holes Fundamental deviation values in micrometres

values Upper deviation

ES

u/Go (incl.)

I

N3)5)

Standard

grades above IT7

lulvlx

PtoZC31

VI

6

-

10

-

14

-

18

-20

-8+A

0

-

12

-

15

-

19

-

23

-28

-lO+A

0

-

15

-19

-

23

-

28

-34

-12+A

0

-

18

- 23

-

28

-

33

-28

-

-22 0 -26 -17+A

0

-23+A

0

-27+A

0

-3l+A

0

-34+A

0

-37+A

0

-4O+A

0

1

-34

0

-2O+A

- 32 -

37 '

-43

-50 -56

- 78 -50

-88

-56

-100

-66

-120

- 78

-140

- 92

-170

-110 -135

Standard tolerance grades

I

-

-15+A

t

tolerance

-4

-4

Values for A

I

-195 -240

35.

-

-39

,

Z

1 ZA 26-

32-

-

35-

42-

-

97

-

64

-

90

-

130

50

-47

48

-

55

43.r -

48

-

60

-

68

- 80

-

-

54

-

70

-81

- 97

-

-54 -

64

801

67

60-

41

50-

-

-

40-

52

-

-

IT3 IT4 IT5 IT6 IT7 ITE 600 0 0 0

-

-45

41

1 ZC

42

-40

-

1 ZB

-

77-108-150

-

63

-

73

-

-

75

-

88

-

94

-

112 -

148

-

200

-

274

114 -

136 -

180 -

242

-

325

98

-

118 -

136 -

188

160

218

-

- 4'

-

53

-

66

-

87

-102

-122

-

144 -

172

-

226

-

300

-

405

- 43

-

59

-

75

-

'02

-120

-146

-

174 -

210

-

274

-

360

-

480

-

5'

-

7'

-

9'

-

124

-146

-178

-

214

-

258

-

335

-

445

-

585

-

54

-

79

-

'04

-

144

-172

-210

-

254

-

310

-

400

-

525

-

690 9al

I--631-65

921~ml-170 'o(j - '34

-202

-248

-300-3651-470-620-80(j-

-

-

'90

-228

-280

-

340

-

415l-

535

-

700

-

-68

-

'08

-

210

-252

-310

-

380

-

465l-

600

-

780

-loo0 -1'50

-

'46

-77

-

'22

-

'66

-

236

-284

-350

-

425

-

52Ol-

670

-

880

-80

-

'30

-

'80

-

258

-310

-385

-

470

-

575I-

740

-

960

-84

-

'40

-

1%

-

284

-340

-425

-

520

-

640

-

820

-1050

-1350

-94

-

158

-

218

-

315

-385

-475

-

580

-

710

-

9m

-1 mo

-1 !%o

-98

-

'70

-

240

-

350

-425

-525

-

650

-

790

-‘IO00

-1300

-1700

-150

-280-400-600

-155

-

310

-

450

-

660

-175

-

340

-

500

-

740 940

-1250

1

',5

1

1,5

2

6

1

6 -7 9

8

',5 ',5 2

6

16

2

3

4

6

7

15

23

3

4

6

9

17

26

4

m

-185-380-560-840 -210

-

430

-

620

-

-220

-

470

-

680

-1050

-250

-

520

-

780

-1150

-260

-

580

-

840

-1300

-300-640-960-1450 -370

-

820

-1200

-1850

-400

-

920

-1350

-2000

-440

-1000

-1500

-2300

-460

-1100

-1650

-2500

-550

-1250

-1900

-2900

-580

-1400

-2100

-3200

3) (concl. ) Examples : K7 in the range 18 to 30 mm : A = 8 pm, therefore ES = -2 + 8 = + 6 pm S6 in the range 18 to 30 mm : A = 4 pm, therefore ES = -35 + 4 = - 31 pm 4)

Special cases: for tolerance class M6 in the range from 250 to 315 mm, ES = -9 pm (instead of - 11 pm).

5)

Fundamental deviation N for standard tolerance grades above IT8 shall not be used for basic sizes less than or equal to 1 mm.


15

IS0 286-l : 1988 (E)

10

IS0 1947, System of cone tolerances for conical workpieces from C = 1 : 3 to 1 : 500 and lengths from 6 to 630 mm.

Bibliography

The following international Standards on tolerancing and tolerance systems will be useful with regard to the application of this part of IS0 286: IS0 406, Technical drawings ances - lndica tiuns on drawings.

Linear and angular

toler-

IS0 1829, Selection of tolerance zones for general purposes.

IS0 2692, Technical drawings Maximum material principle.

Geometrical

tolerancing

-

IS0 2768-1, General tolerances for dimensions without tolerance indications - fart 1: Tolerances for linear and angular dimensions. 1) IS0 5166, System of cone fits for cones from C = 1 : 3 to 1 : 500, lengths from 6 to 630 mm and diameters up to 500 mm.

1) At present at the stage of draft. (Revision, in part, of IS0 2768 : 1973.)


16

-

1

IS0 286-l : 1988 E)

Annex

A

Bases of the IS0 system

of limits

and fits

(This annex forms an integral part of the standard.)

A.1

General

A.2

This annex gives the bases of the IS0 system of limits and fits. The data are given primarily so that values can be calculated for fundamental deviations, which may be required in very special circumstances and which are not given in the tables, and also so that a more complete understanding of the system is provided.

For convenience, the standard tolerances and fundamental deviations are not calculated individually for each separate basic size, but for steps of the basic size as given in table 4. These steps are grouped into main steps and intermediate steps. The intermediate steps are only used in certain cases for calculating standard tolerances and fundamental deviations a to c and r to zc for shafts, and A to C and R to ZC for holes.

It is once more emphasized that the tabulated values in either this part of IS0 286 or IS0 286-2, for standard tolerances and fundamental deviations, are definitive, and shall be used when applying the system.

Table 4 -

Basic size steps

The values of the standard tolerances and fundamental deviations for each basic size step are calculated from the

Basic size steps

Values in millimetres a)

Basic sires up to 500 mm (incl.1

Main steps Above

-

Values in millimetres b)

I

Up to and including

Intermediate Above

I

steps 1)

I

Up to and including

6

6

10

IV

18

40 IO

30

*n

Main steps

I

Up to and including

Above

3 3

Basic sizes above 500 mm up to 3 150 mm (incl.1 Intermediate

steps2) Up to and including

Above

500

630

500 560

560 630

630

800

630 710

710. 800

800 900

900 1000

I im

1000

1 120 1 250

No subdivision

10 14

14 18

800

1000

18 24

24 30

1000

1250

30

50

30 40

40 50

1 250

1600

80

65 80

1400 1600

50

50 65

1250 1400

1600

2000

120

100 120

1800 2000

80

80 100

1600 1800

I

I

~~

120

180

120 140 160

140 160 180

180

250

180 200 225

200 225 250

250

315

250 280

280 315

315

400

315 355

355

400

500

450

2000 2500

I

2500

I

3 150

2000 2240 2500 2800

I

2240 2500

~~

2800 3 150

450 500

1) These are used, in certain cases, for deviations a to c and r to zc or A to C and R to ZC (see tables 2 and 3). 2)

These are used for the deviations r to u and R to U (see tables 2 and 3).


17

IS0 286-l : 1988 E)

geometrical mean (D) of the extreme sizes (0, and 02) of that step, as follows: D=

J&XT&

A.3.2 Derivation of standard tolerances basic sizes up to and including 500 mm A.3.2.1

For the first basic size step (less than or equal to 3 mm), the geometrical mean, D, according to convention, is taken between the sizes 1 and 3 mm, therefore D = 1,732 mm.

A.3

Standard

A.3.1

Gerieral

tolerance

tolerance

grades IT01 to IT4

The values of standard tolerances in grades ITOl, IT0 and IT1 are calculated from the formulae given in table 6. It should be noted that no formulae are given for grades IT2, IT3 and IT4. The values for tolerances in these grades have been approximately scaled in geometrical progression between the values for IT1 and lT5.

grades Table 6 - Formulae for standard tolerances in grades ITOI, IT0 and ITI for basic sizes up to and including 500 mm

The IS0 system of limits and fits provides for 20 standard tolerance grades designated ITOI, ITO, ITl, . . . , IT18 in the size range from. 0 up to 500 mm (incl.), and 18 standard toCerance grades .& the‘size range from 500 mm up to 3 150 mm (i&l.), designated tT1 to IT18. As stated in the “Foreword”, the IS0 system is derived from ISA Bulletin 25, which only covered basic sizes up to 500 mm, and was mainly based on practical experience in industry. The systems was not developed from a coherent mathematical base, dnd ti’ence there are .discontinuities in the system and differing formulae for the deviation of IT grades up to 500 mm.

\

Standard

(IT) for

Values in micrometres Formula for calculation where D is the geometric mean of the basic size in millimetres

Standard tolerance grade

0,3 + 0,008D

IT01 ‘1 ITOI)

0,5 + 0,012.D

’

0,8 + 0,OZOD

IT1 1)

See the “Foreword”

and A.3.1.

, :8

The-values’for standard tolerances for basic sizes from 500 mm up to 3 l’@. tim (incl.) were subsequently developed for experimental purposes; and since they have proved acceptable to industry they are now given as a part of the IS0 system. It should be noted that values for standard tolerances in grades IT0 and IT01 are not given in the main body of the standard because they have little use in practice; however, values for these are given in table 5.

A.3.2.2

Numerical values for standard in grades IT01 and IT0

Standard tolerance grades

Basic size mm Ab.ove

tolerances

IT0

IT01 Up to and including

...I.3 6 10 18 30

3 6 10 18 30 50

50 80 120 180 250 315 400

80 120 180 250 315 400 500

Tolerances w Ot3 014 Of4 0,5

Of5

Or6 016 Or8

016 Or6 W3

1 1

1

115 2 3 4 5 6

12 2 2,5 3' 4

12

tolerance

The standard tolerance factor, i, in micrometres, from the following formula: 0,45 m

is calculated

+ 0,OOID

where D is the geometric mean of the basic size step in millimetres (see clause A.2). This formula was empirically derived, being based on various national practices and on the premise that, for the same manufacturing process, the relationship between the magnitude of the manufacturing errors and the basic size approximates a parabolic function. The values of the standard tolerances are calculated in terms of the standard tolerance factor, i, as shown in table 7. It should be noted that from IT6 upwards, the standard tolerances are multiplied by a factor of 10 at each fifth step. This rule applies to all standard tolerances and may be used to extrapolate values for IT grades above IT18. Example : IT20 = IT15 x IO = 64Oi x 10 = 64OOi NOTE - The above rule applies except for IT6 in the basic size range from 3 to 6 mm (incl.).


18

grades IT5 to IT18

The values for standard tolerances in grades IT5 to IT18 for basic sizes up to and including 500 mm are determined as a function of the standard tolerance factor, i.

i= Table 5 -

Standard

ISO286-1:1988

Table 7 -

Formulae

for standard

Standard

Basic size mm Above

ITll)

IT211 IT311 IT41)

IT5

up to and including

I1)

tolerances

IT6 Formulae

21

2,71

3,71

51

1Oi

7i 71

.

101

IT7

161

grades

I-j=10 [J-II

for standard 16i

in grades ITl to IT18

tolerance

lT8

(I3

tolerances

lTl2

lT13

lT14

lTl5

ln8

lT17

IT18

\

(Results in micrometres)

25i

40i

64i

1OOi

160i

250i

400i

640i

251

401

641

1OOI

1601

2501

4OOr

6401 looor imr

1OOOi 16OOi 2500i

25mr

See A.3.2.1.

A.3.3 Derivation of standard tolerances (IT) for basic sizes from 500 mm up to and including 3150mm The values for standard tolerances in grades IT1 to IT18 are determined as a function of the standard tolerance factor, I. The standard tolerance factor, I, in micrometres, from the following formula:

is calculated

Table 8 -

Rounding for IT values up to and including standard tolerance grade IT11 Rounding values in micrometres Basic size

Calculated values obtained from the formulae given in A.3.2 and A.3.3

Above

I = 0,004D + 2,l

0

where D is the geometric mean of the basic size step in millimetres (see clause A.2).

60 100 200 500 1000 zoo0 5ooo 10 ooo 20 ooo

The values of the standard tolerances are calculated in terms of the standard tolerance factor, I, as shown in table 7. It should be noted that from IT6 upwards, the standard tolerances are multiplied by a factor of 10 at each fifth step. This rule applies to all standard tolerances and may be used to extrapolate values for IT grades above lT18.

Above 500mm up to 315Omm (incl.)

up to 500mm (incl.)

Up to and including

Rounding

60 100 200 500 1000 zoo0 5ooo loo00 20 000 5oooo

1 1 5 10 -

in multiples

of

1 2 5 10 20 50 100 200 500 1000

Example : NOTES

IT20 = IT15 x 10 = 6401 x 10 = 64001

1 The formulae for standard tolerances in grades IT1 to IT5 are given on a provisional basis only. (These did not appear in ISO/R 286 : 1962.)

1 For the small values in particular, it has sometimes been necessary to depart from these rules, and, in some instances, even from the application of the formulae given in A.3.2 and A.3.3 in order to ensure better scaling. Therefore the values given for the standard tolerances in tables 1 and 5, as appropriate, shall be used in preference to calculated values when applying the IS0 system.

2 Although the formulae for i and I vary, continuity of progression is assured for the transition range.

2 Values for standard tolerances in grades IT1 to IT18 are given in table 1 and for IT0 and IT01 in table 5.

A.3.4 Rounding tolerances

A.4

NOTES

of values for standard

Derivation

of fundamental

Fundamental

deviations

deviations

For each basic size step, the values obtained from the formulae given in A.3.2 and A.3.3, for standard tolerances in grades up to and including IT1 1, are rounded off in accordance with the rules given in table 8.

A.4.1

for shafts

The calculated values of standard tolerances in grades above IT1 1 do not require rounding off because they are derived from values of tolerance grades IT7 to IT1 1, which have already been rounded off.

The fundamental deviation given by the formulae in table 9 is, in principle, that corresponding to the limits closest to the zero line, i.e. the upper deviation for shafts a to h and the lower deviation for shafts k to zc.

The fundamental deviations for shafts are calculated from the formulae given in table 9.


IS0 286-l : 1988 E)

Except for shafts j and js, for which, strictly speaking, there is no fundamental deviation, the value of the deviation is independent of the selected grade of tolerance (even if the formula includes a term involving ITn!.

A.4.2

Fundamental

deviations

Hole-basis fit

Shaft-basis fit

(ei) + ITbl)=

for holes

(ES) + ITn ITh-I)

The fundamental deviations for holes are calculated from the formulae given in table 9 and, therefore, the limit corresponding to the fundamental deviation for a hole is exactly symmetrical, in relation to the zero line, to the limit corresponding to the fundamental deviation for a shaft with the same letter. This rule applies to all fundamental following:

deviations except for the

a) deviation N, for standard tolerance grades IT9 to IT16 in basic sizes above 3 mm up to 500 mm (incl.), for which the fundamental deviation is zero ; b)- shaft or ho& basis fits, for basic sizes above 3 up to 500 mm (incl.), im!which a hole of a given standard tolerance grade is associated with a shaft of the next finer grade (e.g. H7/p6 and P7/h6), and which are required to have exactly the same clearance or interferences, see figure 20.

,

In these cases, the fundamental deviation, as calculated, is adjusted ‘by algebraically adding the value of ,4 as follows : Es = ES (as calculated) + d

: where d is the difference ITn - IT(n - 1) between the .I standard tolerance, for the basic size step in the given , grade, and that ih. the next finer grade. v Example :

Figure 20 -

Diagrammatic representation given in A.4.2b)

of the rule

The fundamental deviation given by the formulae in table 9 is, in principle, that corresponding to the limits closest to the zero line, i.e. the lower deviation for holes A to H and the upper deviation for holes K to ZC. Except for holes J and JS, for which, strictly speaking, there is no fundamental deviation, the value of the deviation is independent of the selected grade of tolerance (even if the formula includes a term involving ITn).

For P7 in the basic size range from 18 up to 30 mm: A = IT7 - IT6 = 21 - 13 = 8 pm NOTE - The rule given in b) above is only applicable for basic sizes bier 3 mm for fundamental deviations K, M and N in standard tolera’nce grades up to’and including IT8, and deviations P to ZC in qtandard tolerance grades up to and including IT7.

20

A.4.3 Rounding deviations

of values for fundamental

For each basic size step, the values obtained from the formulae given in table 9 are rounded off in accordance with the rules given in table 10. *


60286-l

Formulae

Table 9 Basic size mm

for fundamental

Shafts

1

120

120

500

es

=: 140 + 0,850

II

c I - I es

520 Of2

1

10

0

1

0

131501

0

/ ---

0

131501

3150

10

0 /

)

cd

1

1

d e

1

-

/

es

1

-

1

es

I

-

I

es

ef

/

-

1

es

f

1

-

1

es

0

I 3150 I

g

I

0

1

h

1 No sign I

0

15001

0

1

0

I

5003)

is k

3 150 mm/ 500

500

3 150

0

500

500

3 150

0

3 150

n

7ik-E-I 24 0

1

I

01

3150

+

I

500

I

I-++&

B

1

j

+

ei

1 1 I I 1

EI

+

D

0

3 150

11Dot41 Geometric mean of the values for E, e and F, f

EI

+

E

0

3 150

EI

+

1

EF---

+

1

F

1

+

1

FG

-I

+

I

5,500#41 Geometric mean of the values for F, f and G, g

I

1

EI

ei ei ei ei

- 0,6 G

G

I’

0

I

1 No sign I

H

I

0

1~ ~Yi~

I

I

J

101

I

JS

I

EI l70 c3

+

I

I

-

-

ES

-

M4)

.

Sk--j 3zei--l

EsI EsI - I p4)II N4)

_ /

Geometric mean of the values for P, p and S, s

++kzi+l EsI IT7 + 0,630

1

IT7 + D

I 1

ES

R4)

/ 9) T4)

’

1

1

-

1

ES I

-

I

u4) 1

ES

-

1

v4)

1

1

ES I ES 1 Es 1 -

I x4) 1 1 Y4) 1 1 24) 1

I

ei

IT8 + 3,15D

1

ES

1

-

1

ZA4)

+

I

ei

IT9 + 40

1

ES

i

-

I

ZB4)

+

I

ei

IT10 + 5D

I

ES I

-

I

zc4) 1

+

0

I

500

1

za

I

+

0

I

zb

I

0

I

500 I 500 I

zc

I

5005)

0 500

3 150

0

500

500

3 150

/+-zE&

IT7 + W

+

I

3 150

1 --/,,

IT7 + 2,5D

1

z

0

500

3 150

ei

y

m--1--

I 0

K4)

ei

5001

I

3150

I

EI

I I I

0

3150

No sign

IT7 - IT6

IT7 + 1,6D

1

EI

ES

IT7 + 1,250

0

I

II

0,5 ITn

El

0,024D + 12,6

r

+ + + +

16D@44

Deviation = 0

ei

40 500 10

I

ei

0 40 0

No formula2)

ei

C-

160 500

CD

I 1

2

+

1 160

+

Deviation = 0

ei

u v x

A

EI

2,5D(‘tN

+

1 1 I I

1

+

EI

95 + 0,8D Geometric mean of the values for C, c and D, d

es

P

t

5001

181

“_

+

EI

es

s I + I ei

131501

14

H+ I +I 1

No sign

31 0

I

i

3 150

500

-

posYtLe) 1

Basic size mm

Fundamental deviation

= 1,8D

101 fg / 3150

Sign (negative

EI

b I -

I

Holes

+--I

7i#+--l 0

for shafts and holes

Formulael) where D is the geometric mean of the basic size in millimetres

-

a

deviations

:I988 (E)

24

1

3150 3150

0

1

14

1

500

0

I

500

18

1

500-

1

0 -1 0 I

500

I

0

I

500

0

1

500

1)

Fundamental deviations (i.e. results from formulae) in micrometres.

2)

Values only given in tables 2 and 3.

3)

Formula only applies to grades IT4 to IT7 inclusively; fundamental

4)

Special rule applies [see A.4.2b)l.

5)

Formula only applies to grades up to IT8 inclusively ; fundamental deviation K for all other basic sizes and all other IT grades = 0.

deviation k for all other basic sizes and all other IT grades = 0.


21

IS0 286-I :,I988 E)

Table 10 -

Rounding

for fundamental

deviations Rounding values in micrometres Basic size

Calculated values obtained from the formulae given in table 9 w Above

Up to and including

5 45 60 100 200 300 500 560,. 600 800 :l ooo 2 ooo

45 60 100 200 300 500 560 600 800 1000 2000 5ooo

. . .

. . .

20 x 10n 50 x 10n loo x 10n

50 x 10n loo x 10n 200 x 10n

above 500 mm up to 3 150 mm (incl.)

up to 500 mm (incl.1 Fundamental a to g A to G

k to zc K to ZC Rounding

1 2 5 5 10 .lO 10 20 20 20 50

deviations d to u D to U

in multiples

of

1 1 1 2 2 5 5 5 10 20 50 100


1 1 2 5 10 10 20 20 20 20 50 100 I

. . . 1 x 10n 2 x 10n 5 x 10n

*

IS0 286-1 : 1988 (E)

Annex Examples

B

of the use of IS0 286-l

(This annex forms an integral part of the standard.)

B.1

.B.3

General

This annex gives examples in the use of the IS0 system of limits and fits, in determining the limits for shafts and holes. The numerical values of the upper and lower deviations for the more generally used basic size steps, fundamental deviations and tolerance grades have been calculated and are tabulated in IS0 286-2.

Examples

8.3.1

Determining

the limits of size for a shaft

0 4og11 Basic size step : 30 to 50 mm (from table 4) Standard tolerance = 160 pm (from table 1) Fundamental deviation = -9 pm (from table 2)

In special cases, not covered by IS0 286-2, the appropriate upper and lower deviations, and hence the limits of size, can be calculated from the data given in tables 1 to 3, and tables 4 to 6 in annex A in this part of IS0 286.

Upper deviation = fundamental

deviation = -9 pm

Lower deviation = fundamentaJ deviation - tolerance = -9 -16Opm= -169pm rI Limits of size:

B.2

Review of special features

A summary of the features and factors which shall be taken into consideration when using this part of IS0 286 to derive upper and lower deviations for special cases is given below: shafts and holes a, A, b, B are provided only for basic sizes greater than 1 mm; shafts j8 are provided only for basic sizes less than or equal to 3 mm; holes K in tolerance grades above IT8 are provided only for basic sizes less than or equal to 3 mm; shafts and holes t, T, v, V and y, Y are only provided for basic sizes greater than 24 mm, 14 mm and 18 mm, respectively (for smaller basic sizes, the deviations are practically the same as those of the adjacent tolerance grades) ; tolerance grades IT14 to IT18 are only provided for basic sizes greater than 1 mm; holes N of tolerance grades above IT8 are only provided for basic sizes greater than 1 mm.

Maximum

= 40 - 0,009 = 39,991 mm

Minimum

= 40 - 0,169 = 39,831 mm

B.3.2 Determining 0 13ON4

the limits of size for a hole

Basic size step : 120 to 180 mm (from table 4) Standard tolerance = 12 vrn (from table 1) Fundamental deviation = -27

+ d pm (from table 3)

Value of d = 4 pm (from table 3) Upper deviation

= fundamental deviation = -27 + 4 = -23 pm

Lower deviation = fundamental deviation - tolerance = -23 - 12 pm = -35 pm Limits of size: Maximum

= 130 - 0,023 = 129,977 mm

Minimum

= 130 - 0,035 = 129,965 mm


23

Is0 286-I : 1988 (El

Annex Equivalent

C terms

(This annex does not form an integral part of the standard.)

C.1

General

This annex establishes a list of terms used in IS0 286 (and in other International Standards on tolerances). NOTE - In addition to terms used in the three official IS0 languages (English, French and Russian), the equivalent terms in German, Spanish, Italian, Swedish and Japanese are also given. These have been included at the request of Technical Committee ISO/TC 3 and are published under the responsibility of the member bodies for Germany, F.R. (DIN), Spain (AENOR), Italy (UNI), Sweden (SIS) and Japan (JISC).

C.2

Notes on, presentation

The numerals 01 to 90 give the alphabetical order for the first language (i.e. English) only (for reference). clause, sub-clause, etc. in

The column “Reference clause” refers to the important place) in this part of IS0 286. The words given in “parentheses”

the term is

(or the most

indicate that the part of the term placed between them may be omitted.

Synonyms have been separated by a semi-colon. some of the preceding words.

Square brackets indicate that the word(s) placed between them may replace all or

Short explanations as regards the term have been presented in note form.

C.3

Recommendations

for the user

It is recommended that the users, for convenience, re-arrange accordingly on the left-hand side of the table.

24

vocabulary alphabetically in their own languages and number


w


serrage eff ectif

caractere d’ajustement

NOTE En descriptions verbales.

actual interference

actual size

approximate size

basic size ; nominal size

character of fit

NOTE In verbal descriptions.

04

05

06

07

08

pa3Mep

nocaAKM

OTKJlOHeHMe

AonycK

&art

tolerance dimensionnelle

exigence de I’enveloppe

element exterieur [femellel d’un ajustement

deviation

dimensional tolerance ; size tolerance

envelope requirement

external [outer] part [component] of fit

12

13

14

15

pa3Mep

Hapymtiafr conpflraewafl Aeran b

K flOKpblTM0

Tpe6OBatiMR

paahnepa

3a4aHHblLil

dimension de consigne

desired size

c 3830-

11

POM

noca4Ka

ajustement avec jeu

clearance fit

10

sasop

jeu

clearance

Hide.

IlPMME~AHME Cnoi3ecHoeonwca-

xapaKTep

pa3Mep

HOMMHaJlbHblfi

Hbll;l

flpM6fll43MTenb-

pa3Mep

fielkTBMTeflbHblfi

HaTfIr

fiel&TBPlTeJlbHblti

OTKflOHeHMe

flefiCTBb4TeflbHOe

09

dimension nominale

dimension approximative

dimension eff ective

&art eff ectif

actual deviation

03

sasop

/JelkTBPlTeJlbHbll;r

jeu eff ectif

TOq(-

actual clearance

02

CTeneHb

Russian

HOCTM

accuracy grade

01

French

degre de precision

English

bference No.

enveloppkrav

condizione del inviluppamento condition del envolvente element0 [piezal exterior de un ajuste

Hiillbedingung

8ul3eres Paf3teil; Aul3enpaf3teil

pezzo esterno di un accoppiamento

dimensionstolerans ; m&tolerans

tolleranza dimensionale

tolerancia dimensional

MalZStoleranz

utvtindig passningsdel

avm8tt ; awikelse scostamento

desviacion (o diferencia 1

ijnskat m&t

Abmaf3

dimensione desiderata

spelpassning

accoppiamento con giuoco

medida teorica

ajuste con juego

Spielpassung

spel

NOT - Med verbal beskrivning.

passningskaraktar

basmatt ; nominellt m&t

ungeftirligt m&t ; cirkam&t

verkligt m&t

verkligt grepp

verkligt avm&t

verkligt spel

noggrannhetsgrad

Swedish

giuoco

NOTA - In descrizioni verbali.

carattere dell’accoppiamento

dimensione nominale

dimensione approssimativa

dimensione eff ettiva

interferenza eff ettiva

scostamento effettivo

giuoco effettivo

grado di precisione

Italian

Sollmaf3

juego

NOTA - En descripciones verbales.

carjrcter de ajuste

medida nominal

medida aproximada

medida efectiva 0 real

aprieto efectivo 0 real

desviacion efectiva 0 real

Spiel

ANMERKUNG In verbalen Beschreibungen.

Passungscharakter

Nennmal3

Ungeftihrmaf3

lstmaf3

lstiibermaf3

lsta bma13

juego efectivo 0 real

grad0 de precision

Genauigkeitsgrad lstspiel

Spanish

German l I

c

-

Japanese

See No. 64

5.3.1.2

4.7

4.6

-

4.10.1

4.8

-

4.3.1

-

4.3.2

-

-

-

-

Reference clause


element d’un ajustement

surface d’ajustement

tolerance d’ajustement

fit component

fit surface ; mating surface

fit tolerance ; variation of fit

17

18

19

~

06141~3 RonycK

OTBepCTLte

systeme d’ajustement

&art fondamental

tolerance fondamentale

tolerance g&&ale

alesage

serrage

ajustement avec serrage

element interieur [mtilel d’un ajustement

degre de tolerance internationale [ normalite] (IT . . .)

fit system

fundamental deviation

fundamental [standard] tolerance

general tolerance

hole

interference

interference fit

internal [inner] part [component] of fit

international [standard] tolerance grade (IT . . .)

22

23

24

25

26

27

28

29

30

nocaAKM

bl I;i

c HaTf+

bl fi 1

MewyHa-

(IT . . .)

POAH blX AOnyCKOB

Knacc

[CTaHflapTH

JJeTan b

conpriraervrafr

BHyTPeHHFlR

TOM

nocaCjKa

HaTflr

flonycK

OTKJlO-

CMCTeMbl

CTaHflapTH

AOnyCK

HeHMe

OCHOBHOe

;

cMcreMa nocaCjok

qeme

yCflOBHOe

0603Ha-

symbole de I’ajustement

fit symbol

21

nocaAKti

zone de tolerance d’ajustement AonycKa

nOCa&KM

fit tolerance zone ; variation zone

none

AOflyCK

nOBepXHOCTb

conpwaeMafi

AeTanb

conpfrraeMaR

nocaAka

Russian

20

[part1

ajustement

French

fit

English

16

Reference No.

.

element0 [ pieza] interior de un ajuste grado internacibnal de tolerancia (IT . . .)

internationaler [Standard-]Toleranzgrad (IT . . .)

grado di tolleranza internazionale (IT . . .)

internationell toleransgrad ; standardtoleransgrad (IT . i .)

invsndig passningsdel

greppassning

accoppiamento con interferenza ajuste con aprieto

pezzo interno di accoppiamento

WPP

interferenza

aprieto

h8il for0

agujero

grundtolerans ; grundtoleransvidd generell tolerans

tolleranza fondamentale

tolerancia fundamental

Egesavm&t

tolleranza generale

scostamento fondamentale

desviacion fundamental

passningssystem

tolerancia general

sistema di accoppiamenti

passningssymbol

simbolo di accoppiamento

simbolo de ajuste

sistema de ajuste

passningens toleransomrade

passningens toleransvidd ; passningsvariation

zona di tolleranza di accoppiamento

tolleranza d’accoppiamento

passningsyta

passningsdel

passning I

Swedish

zona de tolerancia de ajuste

Inneres Pat3teil; Innenpal3teil

0 bermat3passung

ubermaC3

Bohrung

Allgemeintoleranz

Grundtoleranz

Grundabmat3

Passungssystem ; ParJsystem

Passungssymbol ; Passungskurzzeichen

PaWoleranzfeld

Pa&oleranz

tolerancia de ajuste

superficie di accoppiamento

superficie de un ajuste

Pa(3fl8che

element0 [pezzo] di un accoppiamento

element0 [ pieza] de un ajuste

accoppiamento

PaMeil

’

Italian

ajuste-

Spanish

Passung

German

-

-

Japanese

5.1.1 and table 1

See No. 26

4.10.2

4.9

4.2

-

4.7.1

4.6.2

5.2.3

-

4.10.4

-

-

4.10

Reference clause

‘gg / E

iill L ..

0

5

Y


npefienbHble

systeme d’ajustements IS0 ((a arbre normal ))

dimension au minimum de matiere (LMC)

&arts limites

limites d’ajustement

IS0 “shaftbasis” system of fits

least material limit ( LM L)

limit deviations

limits of fit

limits of size

line of zero deviation; zero line

loosest extreme of fit

lower deviation

mating

33

34

35

36

37

38

39

40

41

42

,,OCHOBHOe

nocafloK

JlMHMfI ;

noca~Kl4

HMJ+tHee

&art inferieur

conpfrraeM bl

dimension d’appariement

surface d’ajustement

jeu maximal

mating size

mating surface; fit surface

maximum clearance

43

44

sasop

HaH60JlbUJMlij

flOBepXHOCTb

conpfrraeMafi

pa3Mep

conpm+teHMe

r;5

OTKJlOHe-

nocaAKa

appariement

Hue

6oAt.M

HaPl6OJ-I b UIafi CBO-

OTKJlOHeHMR

JlMHMFl HyJleBOrO

HyJleBafl

qeHMR

npeAenbHble

3Ha-

MMHMMYMa

,,06blr(HblL;i

OTKflOHeHMR

npeflen

Ban I‘

MC0

CwTeMa

eepcl-we“

OT-

MC0

cwTeMa noCaAoK MC0

ajustement limite le plus large

ligne d’ecart nul ; ligne zero

dimensions limites

MarepMana (L/W

systeme d’ajustements IS0 ((3 alesage normal ))

IS0 “holebasis” system of fits

32

fiOflyCKOB

pFI/J OCHOBH blX

serie de toI& rance internationale IS0

IS0 fundamental [standard] tolerance series

31

Russian

French

English

Reference No.

scostamento inferiore

connessione

dimensione di connessione superficie di accoppiamento

desviacion inferior

acoplamiento ; apareamiento medida de acoplamiento superficie de un ajuste juego maxim0

unteres Abmal3

Paarung

PaarungsmaQ

PallSflache

Hachstspiel ; GroWspiel

giuoco massimo

accoppiamento limite il piti largo [scioltol

ajuste limite con maxim0 juego

Hijchstpassung ; weiteste Grenzpassung

linea dello zero

-

lfnea cero ; lfnea de referencia

Linie des Abmaf3es Null ; Nullinie

maxspel

passningsyta

passningsmatt

tillpassning

undre grtinsavm&t

stijrsta passning

nollinje

gransm&t

dimensioni limiti

medidas limites

GrenzmallSe

Grenzpassungen

min. materialgrtins ; stoppgr&is

grtinspassningar

desviaciones ; diferencias)

GrenzabmallSe

dimensione di minim0 materiale

IS0 passningssystem “axeln has”

accoppiamenti limiti

medida de minim0 material

Minimum-MaterialMa13

sistema di accoppiamenti IS0 “al bero base”

IS0 passningssystem “halet has”

ISO-grundtoleransserie

ajustes limites

sistema de ajustes IS0 “eje tinico” (o “eje base”)

ISO-PaTJsystem , , Einheitswelle”

sistema di accoppiamenti IS0 ’ ‘f oro base”

.I

Swedish

grgnsavm&t ; grfinsawikelse

sistema de ajustes IS0 “agujero tinico” (0 “agujero base”)

ISO-Pat3system ,,Einheitsbohrung”

serie di tolleranze fondamentali IS0

Italian

scostamenti limiti

serie de tolerancias fundamentales IS0

Spanish

ISO-Grundtoleranz-Reihe

German

I

Japanese

4.8.2

-

-

-

4.6.1.2

-

4.5 and figure 13

4.3.3

-

-

4.11.2

Reference clause


1)

KanM6p-npo6Ka

jeu minimal

serrage minimal

dimension minimale

&art nega tif

dimension nominale

&arts permissibles

tige [ = arbre]

&art positif

minimum clearance

minimum interference

minimum limit of size

negative deviation

nominal size ; basic size

permissible deviations 1)

plug [ = shaft1

positive deviation

52

53

54

56

56

57

58

59

Equivalent to “limit deviations”.

KnOHeHMR

moyenne des dimensions limites ; dimension moyenne

mean of the limits of size ; mean size

51 3Haqe-

HaTFir

OTKnOHeHMe

nonomMTen

[ = Ban1

AOnYCTMMble

pa3Mep

HOMMHanbHbfi

OTKnOHeHMe

bHoe

OT-

pa3Mep

OTpPlqaTenbHoe

AenbHblti

HaMMeHbWMI;1

HaTfir

HaMMeHbUJMti

sasop

ripe-

; cpefi-

HaMMeHbUlMti

HML;; pa3Mep

pasuepos

HMe npeAenbHblx

cpeAHee

CpeAHPlGl

HMe noca)qKM

serrage moyen

3Haqe-

sasop

mean interference

cpeAHee

cpeAHW

50

jeu moyen

mean clearance

48

MaKCM-

MyMa MaTepMana (MML)

npeflen

ajustement moyen

dimension du maximum de matiere (MML)

maximum material limit (MM-)

47

pa3Mep

tiaid6OnbUIM~ ripe_ I.

#eflbHblL;i

mean fit

dimension maximale

maximum limit of size

46

HaTFIr

HaM6OnbUIMfi

Russian

49

serrage maximal

French

maximum interference

English

45

Reference No.

positives Abmat3

Dorn [ = Wellel

Grenzabweichungen ; zulassige Abweichungen

Nennmaf3

negatives Abmaf3

Mindestmal3 ; Kleinstmaf3

Mindestubermaf3 ; Kleinstu bermaf3

Mindestspiel ; Kleinstspiel minim0

,.

limiti

; dimen-

desviacibn positiva

eje

scostamento positivo

perno [ = albero]

scostamenti ammessi [ammissibili]

dimensione nominale

medida nominal

desviaciones admisibles

scostamento negativo

dimensione minima

interferenza minima

giuoco minim0

sione media

sioni

media delle dimen-

intetferenza media

accoppiamento medio

giuoco medio

dimensione di massimo materiale

dimensione massim,a .

inter-ferentia massima

Italjan

desviacion negativo

medida minima

aprieto minim0

juego

media de medidas limites ; medida media

mittleres Grenzma13; Mittenmaf3

ajuste medio

juego medio

limite de material maxjmo

.-

medida maxima

aprieto maxim0

aprieto medio

L

Spanish

mittleres ii berma13; Mitteniiberma13

mittlere Passung ; Mittenpassung

mittleres Spiel ; Mittenspiel

Maximum-Material-Mat3

Hijchstmal3 ; Grijl3tmal3

Hochstiibermag j GrU3tiibermaf3

German

positivt avmatt

dorn [ = axel]

tillatna awikelser

nominellt m&t ; basm&t

negativt avmstt

undre grfinsm&t

mingrepp

minspel

grsnsm&tens mittvsrde

medelgrepp

medelpassning

medelspel

max. materialmstt ; gsgr&ns

ovre gt%nsm&t

maxgrepp

Swedish

Japanese

Figure 13

-

-

4.3.1

Figure 13

4.3.3.2

4.9.1

4.8.1

-

-

-

-

4.12

4.3.3.1

Reference clause

G

Q iii

I# L_* .. ma

0


I)

(960)

dimension sans indication (directe) de tolerances

douille E= al&age]

facteur de tolerance (i, I)

tolerance statistique

palier de dimensions nominales

&arts symetriques

dimension auxiliaire

dimension de reference theoriquement exacte

limite d’ajustement le plus etroit

size without (direct) tolerance indication

sleeve [ = hole1

standard tolerance factor (iI I)

statistical tolerance

step [range] of nominal sizes

symmetrical deviations

temporary size

theoretically exact reference size

tightest extreme of fit

66

67

68

69

70

71

72

In French a “dimension”

is named “tote”

pa3Mep

dimension ; tote 1)

size ; dimension

64

bH bl fi

TeM-

AonycKa

HOMM-

s;rpa3Mep

b-

ble

when it is on a drawing.

Hau6Onee nnorHaft nocwka

pa3Mep

TeopeTwlecKwl

H bl

BcnoMoraTen

OTKJlOHeHMFl

CMMMeTpWlH

POB

Han bH blX pa3Me-

MHTepBaJl

AonycK

CTaTMCTlNeCKMh

(i, I)

eAuH&a

[ = OTBepCTkle]

b40

yKa3aHvlfl

KaJWl[ip-KOJl

AonycKa

Moral

pa3Mep 6e3 [npn-

(%I

65

relative interference (%o)

63

Ban

OTHOCMTeJl

sasop

OTHOCMTeJlbHbl~

arbre

jeu relatif MO)

relative clearance (960)

62

bHaFl

nepa-rypa

HOpMaJl

POB

shaft

temperature de reference

reference temperature

61

HOMM-

Han bH blX pa3Me-

MHTepBaJl

HaTRr

palier de dimensions nominales

range [step] of basic [nominal] sizes

60

Russian

jeu relatif No)

French

English

Reference No.

gruppo di dimensioni nominali

unidad de tolerancia (i, I) tolerancia estadistica grupo de medidas nominales

Toleranzfaktor (i, I); Toleranzeinheit statistische Toleranz Nennmat3bereich

medida absoluta de referencia

I ajuste lfmite con minim0 juego

Mindestpassung ; engste Grenzpassung

medida auxiliar

theoretisc h genaues Bezugsmal3

Hilfsmaf3

desviaciones simetricas

tolleranza statistica

casquillo I= agujerol

Hiilse [ = Bohrungl

symmetrische Abmal3e

dimensione senza indicazione [diretta] di tolleranza

medida sin indicacion directa de tolerancias

Ma8 ohne [direktel Toleranzangabe ; Freimaf3

accoppiamento limite il piti, stretto

dimensione teoricamente esatto di riferimento

dimensione ausiliaria

metrici

scostamenti sim-

unita di tolleranza (i, I)

bossolo [ = forol

dimensione

albero

medida ; dimension

eje

Welle

interferenza relativa (960)

giuoco relativo 060)

temperatura di riferimento

grupo di dimensionali nominali

Italian

Ma13

aprieto relativo (960)

juego relativo 060)

relatives Spiel (960); bezogenes Spiel relatives ii berma13; bezogenes ijbermat3 (960)

temperatura de referencia

grupo de medidas nominales

Nennmaf3bereich

Bezugstemperatur

Spanish

German

I

min. granspassning

teoretiskt exakt referensmstt

hjUpm&t

symmetriska avmatt

steg (omr8den) av nominella m&t

statistisk tolerans

toleransenhet ii, I)

hylsa [ = haI]

icke direkt toleranssatta m&t

m&t ; dimension

axel

relativt grepp (960)

relativt spel (960)

referenstemperatur

basm&tsomraden

Swedish

-

-

-

-

-

-

Japanese

A.2

-

4.7.5

-

-

4.3

4.1

-

-

7

A.2

Reference clause

© ISO 2009 - This is a single-user license for personal use only. All other uses prohibited. none Aonycka pa3Mep c

4onyc.k nocaflw

riynesaa nwwrfl

degre de tolerance ; qualite de tolerance (ancien)

tolerance d’ajustement ; variation de I’ajustement

tolerance de forme

tolerance de position

position de la tolerance

serie de tolerances

symbole de to&rances

systeme de tolerances

zone de tolerance

dimension toleran&e

ajustement incertain

&art superieur

tolerance d’ajustement .

ligne zero

tolerance grade; grade of tolerante

tolerance of fit ; variation of fit

tolerance of form

tolerance of position

tolerance position

tolerance series

tolerance symbol

tolerance system

tolerance zone

toleranced size

transition fit

upper deviation

variation of fit; fit tolerance

zero line

77

78

79

80

81

82

83

84

85

86

87

88

89

90

b 4onycKa

C#lOPM bl

0603t-m

Hlfle

sepxriee OTKflOHe-

nepexofiHafr nocaAka

#qo-

AOnyCKOB

~OnycKoM

nyCKOB

CMCTeMa

Yewe

ycnosrioe

PflA JjOnyCKOB

p(OnyCKOB

pacnonomewe

XeHMFl

Aonyck pacnono-

AOnyCK

#onycr< noca&w

creneti

none Aonycka

classe de tolerance; serie de tolerances d’u ne zone

tolerance class

.

76

AonycK

Russian

tolerance

French

tolerance

English

75

efer!nce No.

formtolerans

serie av toleransvidder toleranssymbol

tolleranza di forma tolleranza di posizione posizione di tolleranza serie [gamma] di tolleranza simbolo di tolleranza

tolerancia de forma tolerancia de position posici&n de tolerancia serie de tolerancias

Nullinie

linea cero ; linea de referencia

tolerancia de ajuste

linea dello zero

tolleranza [variazione] di accoppiamento

scostamento superiore

desviacion superior

oberes Abmaf3

Pal3toleranz

accoppiamento incerto

ajuste indeterminado

0 bergangspassung

dimensione con tolleranza

zona de tolerancia

Toleranzfeld medida con tolerancia

zona di tolleranza

sistema de tolerancias

Toleranzsystem

toleriertes Ma13

sistema di tolleranze

simbolo de tolerancias

Toleranzsym bol ; Toleranzkurzzeic hen

Toleranzreihe

Toleranzlage

Lagetoleranz

Formtoleranz

nollinje

passningsvariation ; passnings toleransens vidd

ijvre gransavm&tt

mellanpassning

toleransbestamt mStt

toleransomrSde ; toleranszon

toleranssystem

toleranslage

IBgetolerans

passningens toleransvidd ; passningsvariation

tolleranza di accoppiamento

tolerancia de ajuste ; variation de ajuste

Pal3toleranz

toleransgrad

grado di tolleranza

grado de tolerancia

-

-

-

9

J!iH%

gs!ibs

C‘dt;&&L’o3

-m if&sgg

qqgjrg&

/k\EH

3ss~

-$-~~~~+j

Q$gga,

WSSE

mii!Js ,

l;f:ao$wcl)

/k\Ewi

/k\gjg

Toleranzgrad ; Toleranzqualitat (ehemals)

g-B/k\%

fi=

=j x

JapandO@

toleransvidd ; tolerans tolerans ; toleransklass

I

Swedish

cl&se-di tolleranze I.

tolleranza

Italian

. clase de tolerancia’s ; serie de tolerancias de un camp0

tolerancia, ’ ’ ,:-. .

Spanish

Toleranzklasse ; Toleranzfeldre/he e.

Tderanz

German

’

4.5

4.10.4

4.6.1 .I

4.10.3

-

4.7.3

1 and 2

5.2.2

-

497.3

-

5.3.2

4.10.4

4.7.2

4.7.4

4.7

Reference: clause

This page intentionally leff blank


Is0 286-l : 1988 E)

UDC 621.753X2 Descriptors

: dimensional tolerances,

fits, fundamental tolerances,

definitions’

symbols,

designation’

Price based on 30 pages


schematic representation’

dimensions.

Iso 286-1 (Limites y Ajustes)

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