ANSI B4.1-1967 Preferred Limits and Fits for Cylindrical Parts

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2 5 7 5 5 3 20 0 8 1 5 8 22 3 4

ANSI84.1-1967 4 January 1972

ACCEPTANCE NOTICE The above IndustryStandardization Document wasadopted on 4 January 1972and i s approved for use by the DOO. The indicated industry groups have furnished the clearances required by existing regulations. Copies of the document are stocked by DoD Single Stock Point, U.S. Naval Publications and Forms Center, Philadelphia, Pennsylvania 19120, for issue to DoD activities only. Title of Document: Preferred Limits and Fits for Cylindrical Parts Date of Specific Issue Adopted: 18 September 1967

- Plus Errata

Releasing Industry Group: The American Society of Mechanical Engineers Custodians: Army MU Navy - SH Air Force 70

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Military Coordinating Activity: Air Force 70 Project No. MISC-0596

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No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise. without the prior writtun permission of the publisher.

Copyrrghr, Q. 1967, by THE AMERICAN SOCIETY O F MECHASICAL ENGINEERS

Printed in U.S.A.

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COPYRIGHT 2003; American Society of Mechanical Engineers

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S T A N D A R D

Preferred Limits and Fits for Cylindrical Parts USAS 84.1-1967 (R1974) Note For soft conversion of nominal dimensions and limits given in this standard, 1 inch = 25.4 For explanation of conversion techniques see American National Standard 2210.1-1 972, Metric Practice Guide.

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SpOndoP The American Society of Mechonicol Engineers

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MECHANICAL

345 East 47th Street

ENGINEERS

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HIS standard represents the latest result of vork which began w i t h the organization of Sectional Committee B4 in June 1920 under the namf “Sectional Committee on the Standardization of PlainLimitGages forGeneralEngineering Work. ” Thisoriginalcommitteeproduced AmericanStandard ASA B4a-1925, “Tolerances, Allowances and Gages for Metal Fits,” which w a s u s e d i n varying degree for many years. In December 1930, SectionalCommittee B4 wasreorganizedandthenamechangedtothe presentform,“SectionalCommittee on t h e StandardizationofAllowancesandTolerancesfor to a more Cylindrical Parts and Limit Gages.” The change in name indicated a significant shift definite and somewhat more restricted mission for the committee. Duringtheyears of World War II an ASA War Committeeformed i n 1943 workedon the proje c t but produced no completed results, and t h e activity was turned back to Sectional Committee the Unification of B4.AfterthewarthesubjectwasdiscussedattheCanadianConferenceon Engineering Standards held i n Ottawa in 1945, attended by d e l e g a t e s from Great Britain, Canada, York later in t h e same year. and the United States, and again at another joint meeting in New Thesemeetingsaresignificantbecausesince1945 work i n thisprojecthasbeenstronglyinfluenced by theseandsimilarABCconferences.Properevaluationofthepresentstandard will depend upon an appreciation of the important effects of progress towards agreement on unification of standards between the ABC countries. of theactivitiesimmediatelyfollowing World War II wasAmericanStandard Theresult I), ASA B4.1-1947.” In the preface to “ L i m i t s a n d F i t s for Engineeriw and Manufacturing (Part that document i t was stated that the ABC meetings resulted in agreement on five baslc principles, and since the first four of these principles, w i t h certain minor and obvious variations, apply to m u s t be a t h i s p r e s e n t s t a n d a r d , i t is considered worth w h i l e torepeat them here. First, there commonlanguage(definitions)throughwhichanalyses may berecordedandconveyed.Second, i n reducingthenumber of differentdiameterscommonly a table of preferred basic sizes helps used in agivensizerange.Third,preferredtolerancesandallowancesarealogicalcompleaid the designer i n se!ectingstandardtolerances.Fourth, menttopreferredsizesandshould uniformity of method of applying tolerances is e s s e n t i a l . i n N e w York i n June 1952 and February 1953. DelegaAdditional ABC conferences were held tions fromSectionalcommittee B4 were active in these conferences, which resulted in a draft proposalforanABCsystem of Limits and Fits, published as ASA B4/30.TheSectionalCommittee B4 d e l e g a t e s to these conferences voted to recommend approval of the ABC proposals as t h e b a s i s for an American standard i f and when such a standard were developed. of thisstandardthere h a s beenadditionaldiscussionsatABCconSincethepublication 1960 and at Arden House, New York, in September 1962. There ferences held i n Ottawa in June hasbeen a n expansion o f definitionsunder ASA 8 1 . 7 , andtheyarereflectedintherevision. The revisedproposalwassubmittedtothesponsororganizationandtothe USA Standards Institute (formerly American Standards Association) for final approval as a USA Standard. This approval was granted on August 3. 1966. This revision, however, was never published as it was noted that other rhanges, agreed CO a t the Arden House ABC Conference, had not been incorporated i n the standard. A newrevisionwasissued,andfollowingapproval by the USA StandardsCommitteeB4, it was approved by the sponsor and on September 18, 1967 by the USA Standards Institute.

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T h i s USA Standardisone of nearly 3000 standardsapprovedasAmerican standards by the American Standards Asscciation. On August 24, 1966, t h e ASA of America standards Institute. Standards was reconstituted as the United States USA Standards. There is no approved a s American Standards are now designated change in their.index identification or technical content.

UDC 621.753.1.3

...

111



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USA STANDARD

ASME B'4.3 67

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07596700573635722

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USA StandardsCommittee B4, Standardizationof AllowancesandTolerancesforCylindricalPartsandLimitGages OFFICERS G. H. Stimson, Chairman

COMMITTEE MEMBERS AMERICAN SOCIETY FOR QUALITY CONTROL R. J . Morris, International Harvester Co., Chicago, I11 AMERICAN SOCIETY OF MECHANICAL ENGINEERS, THE Z. R. Bliss, Brown University, Providence, R.I. R: T. Woythal, Kearney & Trecker Corp., Milwaukee, Wisconsin AMERICAN SOCIETY OF TOOL ANDMANUFACTURING ENGINEERS G. H. Stimson, Greenfield Tap and Die, Division of United-Greenfield Corp., Greenfield, Mass. ANTI-FRICTION BEARING MANUFACTURERS ASSOCIATION, INC. H. L. Potter, The Fafnir Bearing Co., N e w Britain, Com. BUSINESS EQUIPMENT MANUFACTURERS ASSOCIATION A. E. Mall, Interhational Business Machines Corp., Endicott,

N. Y.

METAL CUTTING TOOL INSTITUTE A. F. Miller, Jr., Wells Tool Co., Greenfield, Mass.


NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION F. V. Kupchak, Westinghouse Electric Corp., Pittsburgh, Pa. L. D. Price, Alternate, National Electrical Mfgrs. Association, New York, N. Y. NATIONALMACHINE TOOL BUILDERS' ASSOCIATION F. S. Blackall, III, The Taft-Peirce Mfg. Co., Woonsocket, R. I. SOCIETY O F AUTOMOTIVE ENGINEERS, INC. R. F. Holmes, General Motors Technical Center, Warren, Michigan SPORTING ARMS 8z AMMUNITIONS MANUFACTURERS ASSOCIATION J . F. Walsh, Olin Mathieson Chemical Co., New Haven, Conn. U. S. DEPT. OF THE ARMY C.B. Keane, Frankford Arsenal, Philadelphia, Pa. U. S. DEPT. OF COMMERCE I. H. Fullmer, National Bureau of Standards, Washington, D. C. U. S. DEPT. OF THE NAVY Code 609.3C, Bureau of Ships, Navy Dept., Washington, D. C. J, C. Reid, Alternate, Bureau of Ships, Navy Dept., Washington, D.C. U. S. MACHINE, CAP, WOODAND TAPPING SCREW BUREAUS H. G. hluenchinger, Holo-Krome Screw Corp., Hartford, Com.

INDIVIDUALMEMBERS W. S. Brown, Roanoke, Virginia H. W. Fahrlander, Sr., St. Pet.ersburg, Fla. W. H. Gourlie, West Hartford, Conn. R. E. W. Harrison, Harrison Engineering Services, Inc., Washington, Ronald Jones, Westinghouse Electric Corp., Philadelphia, Pa. A. O. Schmidt, The Pennsylvania State University, University Park, L. F. Spector, Hitchcock Publishing Co.,Wheaton, Ill. H. D. Stover, Timken Roller Bearing Co., Canton, Ohio

D. c. Pa.

iv

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ASME B4.L

6 7 D 0 7 5 7 b 7 0 057LbLb 6 6 9 D

USA Standard

PreferredLimits

and Fits forCylindricalParts

1. Scope and Application.

of magnitude, 2.3 Size. Size i s adesignation When a value is a s s i g n e d to a dimension it is referred to hereinafter a s t h e s i z e of that dimension.

1.1 T h i s s t a n d a r d p r e s e n t s d e f i n i t i o n s of terms plain (non-threaded) applying to fits between cylindrical parts and makes recommendations on fits preferred sizes, allowances, tolerances, and for u s e wherever they are applicable. The standard through 20 in. diameter i s in accord with the recommendations of American-British-Canadian Conferences. Experimental work i s being carried on and when results are available, agreement in 20 in.willbesought.Itrepretherangeabove sentsthecombinedthinkingandexperience of groups who have been interested in standards in it shouldhaveapplicationfora thisfield,and of products.Therecommendations, widerange therefore, are presented for guidance and for use wheretheymightservetoimproveandsimplify products, practices, and facilities. Many factors,such a s length of engagement, bearing load, speed, lubrication, temperature, humidity, surface texture,andmaterials,must betakenintoconsiderationintheselection of fits for a particular application, and modifications to intheserecommendationsmightberequired satisfyextremeconditions.Subsequentadjusta s the result of exments might also be desired periencein a particularapplication to suitcritical functional requirements or to permit optimum manufacturingeconomy.Selection of departure from theserecommendationswilldependupon consideration of theengineeringandeconomic factors that might be involved.

NOTE: It is r e c o g n i z e d that thewords“dimension” to c o n v e y t h e meanand “size” are both used at times i n g of magnitude.

2.4 Nominal Size. Thenominalsize

is thedeof general signation which is used for the purpose identification.

2.5Basic Size. T h eb a s i cs i z ei st h ast i z e from which the limits of s i z e a r e d e r i v e d by the application of allowances and tolerances. 2.6Reference Size. A r e f e r e n c e s i z e i s a size without tolerance used only for information puror inspecposes and does not govern machining tion operations. 2.7Design Size. T h ed e s i g ns i z ei st h eb a s i c size with allowance applied, from which the limitsof size arederived by theapplicationof tolerances. If t h e r ei sn oa l l o w a n c et h ed e s i g n size is the same as the basic size.

2.8 ActualSize.

An a c t u a ls i z ei s

a measured

size. 2.9 Limits of Size. T h el i m i t s applicable maximum and minimum 2.14, Tolerance Limit)

of s i z ea r et h e sizes. (See

2.10 MaximumMaterialLimit. A maximum mais thatlimit of sizethatprovides teriallimit t h e maximum amount of material for the part. Normally i t i s t h e maximum limit of s i z e of an external dimension or the minimum limit of s i z e of an internal dimension.

2. Definitions

2.11 Minimum MaterialLimit. A minimum material limit is that limit of size that provides the minimum amount of material for the part. Normall y i t is the minimum limit of s i z e of an external dimension or the maximum limit of size of an internal dimension.

2.1Termsrelating to t h es i z ea n df i t of p a r t s to mechanical whicharegenerallyapplicable parts, are defined a s follows: 2.2 Dimension.Adimension i s a geometrical c h a r a c t e r i s t i c s u c h a s diameter, length, angle, or centerdistance.Theterm“dimension”isalso to i n d i c a t et h es i z e or usedforconvenience numerical value of a dimension as specified o n the drawing.

NOTE: Anexample

of e x c e p t i o n s :a ne x t e r i o rc o r n e r r a d i u sw h e r e the m a x i m u m r a d i w i s the minimummateriallimitand the minimumradius is the maximum material limit.

1



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USA STANDARD

NOTE: Theplural term "tolerances" i s sometimes usedtodenotethepermissiblevariations from the i s exspecified or designsize, when thetolerance pressedbilaterally. In this sense the term i s identical to "Tolçrance limit."

2.14 Tolerance Limit. A tolerancelimit is the variation, positive or negative, by which a size i s permitted to depart from the design size. (See 2.9, Limits of Size) 2.15 UnilateralTolerance. A unilateraltolerance i s atolerancein which variation is permitted only in one direction from the design size. 2.16 BilateralTolerance. A bilateraltolerance is a tolerance in which variation i s permitted in both directions from the design size. 2.17 Fit. Fit i s the general term used to signify therange of tightness or looseness which may result from the application of a specific combination of allowances and tolerances in the design of mating parts. 2.18 Actual Fit.Theactualfit between two mating parts i s therelationexisting between them with respect to the amount of clearance or interferencethat i s present when theyare assembled.

2.24 Basic Hole System. A basicholesystem is asystem of fits inwhich the design size of the hole i s rhe basic size and the allowance, if any, i s applied to the shaft. 2.25 Basic Shaft System. A basicshaftsystem i s asystem of fits inwhich thedesign size of the shaft i s the basicsize and theallowance, if any, i s applied to the hole.

3. Preferred Basic Sizes

In specifying fits, the basicsize of mating parts shall be chosen from the following tables (one for fractionalandone for decimal sizes) whenever possible. All dimensions are given in inches.

TABLE 1 Preferred Basic Sizes Fractional


NOTE: Fits are of threegeneraltypes:clearance, transition, and interference.

2.19 Clearance Fit. A clearance fit i s one having limits of size so prescribed that a clearancealwaysresults when mating partsareassembled. 2.20 Interference Fit. An interference fit i s one having .limits of size so prescribed that an interferencealwaysresults when mating parts are assembled.

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1/64 1/32 1/16 3/32 1/8 5/3 2 3/16 1/4 5/16 3/8 7/16 1/2 9/16 5/8 11/16 3/4 7/8

2.21 Transition Fit. A transition fit i s one havinglimits of size so prescribedthateither aclearance or an interference may result when mating parts ace assembled.

1 1:/4 1 1/2 1 3/4 2 2 1/4 2 1/2 2 3/4

2.22 Unilateral Tolerance System. A design plan which uses only unilateral tolerances i s known a s a unilateral tolerance system.

3 3 1/4 3 1/2 3 3/4

2.23 BilateralTolerance System. A design plan which uses only bilateral tolerances i s known a s a bilateral tolerance system.

4 4 1/4 4 1/2 4 3/4

0.015625 0.03125 0.0625 0.09375 0.1250 O. 15625 0.1875 0.2500 0.3125 0.3750 0.4375 0.5000 0.5625 0.6250 0.6875 0.7500 0.8750 1.0000 1.2500 1.5000 1.7500 2.0000 2.2500 2.5000 2.7500 3.0000 3.2500 3.5000 3.7500 4.0000 4.2500 4.5000 4.7500

5 5 1/4 5 1/2 5 3/(4

6 6 1/2 7 7 1/2 8 8 1/2

4 9.112 10 10 1/2 11 11 1/2 12 12 1/2 13 13 1/2 14 14 1/2 15 15 1/2 16 16 1/2 17 17 1/2 18 18 1/2 19 17 1/2 20

5.0000 5.2500 5.5000 5.7500 6.0000 6.5000 7.0000 7.5000 8.0000 8.5000 9.0000 9.5000 10.0000 10.5000 11.0000 11.5000 12.0000 12.5000 13.0000 13.5000 14.0000 14.5000 15.0000 15.5000 16.0000 16.5000 17.0000 17.5000 18.0000 18.5000 19.0000 17.5000 20.0000

2




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2.12 Allowance, An allowance is aprescribed difference between the maximum-material-limits of mating parts. It is the minimum clearance (positive allowance) or maximum interference (negative allowance) between such parts.(See 2.17 Fit.) 2.13 Tolerance. A tolerance i s the total permissible variation of asize.Thetolerance i s the difference between the limits of size.

P R E F E R R E D LIMITS AND.FITS

5 . AcceptanceofParts

TABLE 2 Preferred Basic Sizes

5.1 Acceptability. A part shall be dimensionally a c c e p t a b l e if i t s a c t u a l size d o e s n o t e x c e e d t h e limits of sizespecifiedinnumericalvalueson the drawing or in writing. It does not meet dimensionalspecification if its a c t u a ls i z ee x c e e d s those limits.

Decimal

2.00 2.20 2.40 2.60

0.010 0.012 0.0 16 0.020 0.025 0.032 0.040 0.05 0.06

8.50 9.00

9.50 10.00 10.50 11.o0 11.50 12.00 12.50 13.o0 13.50 14.00 14.50 15.00 15.50 16.00 16.50 17.00 17.50 18.00 18.50 19.00 19.50 20.00

2.80 3.00

3.20 3.40 3.60

0.08

3.80

0.10 0.12 0.16 0.20 0.24 0.30 0.40 0.50 0.60 0.80 1.o0 1.20 1.40 1.60 1.80

4.00 4.20 4.40 4.60 4.80 5.00 5.20 5.40 5.60 5.80 6.00

6.50 7.00 7.50

5.2 ReferenceTemperature. Limits of s i z ea s derived from the tolerances shown herein are the extremevalues,withinwhichtheactualsize of the dimension shall lie, at the standard temperature of 20C or 68F. For Length deviations per inch (or per centi68F, andfor meter)fortemperaturesotherthan of thermalexpansion,refvariouscoefficients erenceshouldbemadetothetablesinAppendix II.

5.3 Limitsandtolerancesareconsidered

to be of decimal a b s o l u t er e g a r d l e s s of thenumber as places. Limits and tolerances are to be used if they were continued with zeros beyond the last significant figure.

8.00


4. Preferred Seriesfor Tolerances and Allowances.

NOTE: T h i s m e a n s t h a t all i n a c c u r a c i e s of s i z e , d u e Allfundamentaltolerancesandallowances of to errors,wear, or changein tools, gages,machines, a l ls h a f t sa n dh o l e sh a v eb e e nt a k e n from the wichin p r o c e s s e s o r measurement, shall beincluded series given in the following table. All dimensions t h e s e l i m i t s . are given in thousandths of an inch.

5 . 4 E f f e c t of Surface Texture. Parts of n e c e s s i t y aremeasuredoverthecrests of surfaceirregularities, yet for moving parts such irregularities For SoOn wear off and clearances are increased. t h i s r e a s o n s u r f a c e f i n i s h is quite critical, espebe speciallyforthefinergrades,andshould For further cifiedwhenconsiderednecessary. to USA Standard d e t a iol nt h is u b j e crte f e r Surface Texture, USAS B46.1.

TABLE 3

o. 1 ... 0.15

... ...

0.2

...

0.25

...

0.3

...

0.4

...

0.5 0.6 0.7 0.8 0.9

1 1.2125 1.4 1.6 1.8 2 2.2 2.5 2.8 3 3.5 4 4.5 5 6 7

10

100

12 14 16

160

18 20

200

22 25

250

...

... ...

28

...

30 35

._. ...

40

45 50 60

8

70 80

9

...

6. StandardTolerances T h es e r i e s of standardtolerancesshownin T a b l e 4 a r e so arrangedthatforanyonegrade theyrepresentapproximatelysimilarproduction considerationsthroughouttherange of s i z e s . T h e t a b l e p r o v i d e s a suitablerange from which appropriatetolerancesforholesandshaftscan of standard b es e l e c t e d .T h i se n a b l e st h eu s e gages.Thesetoleranceshavebeenusedinarr a n g i n g t h e f i t s g i v e n i n T a b l e s 5 to 9 .

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

... ... ...

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USA STANDARD

TABLE 4 Tolerance values are in thousandths of an inch. Data in bold face are in accordance with ABC agreements. 7

Nominal Size Range Inches Over To

o

--

0.12 0.24 - 0.40 0.71 1.19 1.97 3.15 4.73 - 7.09 9.85 12.41 - 15.75 19.69 19.69 30.09 30.09 41.49 56.19 41.49 76.39 56.19 76.39 -100.9 100.9-131.9 131.9-171.9 171.9 -200

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0.12 0.24 0.40 0.71 1.19 1.97 3.15 4.73 7.09 9.85 12.41 15.75

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-

Grade

Grade

Grade

4

5

6

0.12 0.1s 0.15 0.2 0.25 0.3 0.3 O. 4 0.5 0.6 0.6 0.7 0.8 0.9 1“O 1.2 1 .6 2 .o 2.5 3 4

0.15 0.20 0.2s 0.3 0.4 0.4 0.s 0.6 0.7 0.8

0.9 1.o 1.0 1.2 1.6 2.0 2.5

Grade

Grade

8

9

Grade 10

Grade 11

0.4 0.5 0.6 0.7 0.8 1.o 1.2 1.4 1.6 1.S 2.0 2.2 2.5

0.6 0.7 0.9 1.o 1.2 1.6 1.8 2.2 2.5 2.8 3.0 3.5 4 5 6 8 10 12 16 20 25

1.0 1.2 1.4 1.6 2.0 2.5 3.0 3.5 4.0 4.5 5.0 6 6 8 10 12 16 20 25 30 40

1.6 1.8 2.2 2.8 3.5 4.0 4.5 S 6 7 8 9 10 12 16 20 25 30 40 50 60

2.5 3.0 3.4 4 .O 5.0 6 7 9 10 12 12 14 16 20 25 30 40 50 60 80 1O0

0.25 0.3 0.4 0.4 0.5 0.6 0.7 0.9 1.o 1.2 1.2 1.4 1.6 2.0 2.5

3

3

4 5

4

6

5

8 10

6

Grade 7

3 4 5

6 8 10 12 16

Grade 12

Grade 13

4 5 6

7 8 10 12 14 16 18 20 22 2s 30 40 50 60 80 100 125 160


7. Selection of F i t s

been extended to include a wider range of s i z e s . Standard fits are represented graphically by Figures 1 to S.

In s e l e c t i n g l i m i t s of s i z e foranyapplication,

the type of fit is determined first, based on

the

8.2 Designation of StandardFits.Standardfits aredesignated by means of thesymbolsgiven below to facilitate reference to classes of fit for educationalpurposes.Thesesymbolsarenot intended to be shown on manufacturing drawings; instead,sizesshouldbespecified ondrawings. The letter symbols used are a s follows: RC Running or Sliding Clearance Fit L C L o c a t i o n a l C l e a r a n c e Fit L T T r a n s i t i o n C l e a r a n c e or Interference Fit LN Locational Interference Fit FN Force or Shrink Fit These letter ‘symbols are used in conjunction with numbers representing the class of fit; thus “ F N 4” r e p r e s e n t s a c l a s s 4, force fit. Each of these symbols (two letters and a number) represents a complete fit, for which the minimum and maximum clearance or interference, and the limits of s i z e for the mating parts, are given directly in the tables.

u s e or service required from the equipment being designed;thenthelimits of s i z e of themating parts are established, to assure that the desired fit will be produced. Theoretically an infinite number of fits could be chosen, but the small number of standard fits shownhereinshouldcovermostapplications.

8. Standard Fits 8.1 T a b l e s S to 9 havebeendevelopedtogive a s e r i e s of standard types and classes of fit on a unilateral hole basis, such that the fit produced by matingparts i n anyoneclasswillproduce approximatelysimilarconditionsthroughoutthe range of s i z e s . T h e s e t a b l e s p r e s c r i b e the fit for any given size, or type of fit; they also prescribe thestandard limits for thematingpartswhich will produce the fit. In developing Tables 5 to 9 i t has been recognized that any fit will usually be required to perby the form one of .three functions, as indicated three general typesof fits: running fits, locational fits, and force fits. S to 9 containall The fits l i s t e di nT a b l e s ABC proposalbuthave thoseintheapproved

8.3 Description of Fits. 8.3.1 Running and SIiding Fits. Runningand of clearanceare sliding fits, forwhichlimits a simgiven in Table 5 , are intended to provide

4


6 7 9 10 12 16 18 22 2s 28 30 35 40 50 60 80 100 125 160 200 250



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P R E F E R R E D LIMITS AND F I T S ilarrunningperformance,withsuitablelubricationallowance,throughouttherange of s i z e s . T h ec l e a r a n c e sf o rt h ef i r s tt w oc l a s s e s ,u s e d chiefly a s slidefits,increasemoreslowlywith so that accurate diameter than the other classes, locationismaintainedevenattheexpenseof free relative motion.

.-

8 6 4

2

O -2

T h e s e f i t s may be described briefly a s follows:

g 5

-4

i 1;

R C 1 C h s e slidingfits areintendedfortheaccuratelocation of partswhichmust assemperceptible without play. ble

-

m

-12 H O L E S

-16. - 18 --14.

6 4

2

-20 -

- 22

! o

~

~

SHAFTS "_

-~

~~~

-2

3-4

FIG.2 GRAPHICAL REPRESENTATION O F STANDARD LOCATIONAL CLEARANCE FITS (SHOWN IN TABLE 6)

-6 -8 -10

'

8.3.2 Locational Fits. L o c a t i o n a l f i t s a r e f i t s intended to determineonlythelocation of the or a c c u r a t e mating parts; they may provide rigid or provide location, a s withinterferencefits, R C 2 Sliding fits are intended for accurate locagreater maximumclearancesomefreedomoflocation, a s withclearancefits. tionbutwith this fit Accordingly they are divided into three groups: than ,-lass RC 1. parts made and turn easilybutarenotintendedClearancefits,transitionfits,andinterference fitstorunfreely,andinthelargersizes may T h e s ea r e morefullydescribed a s follows: seize with small temperature changes. L C Locationalclearance fits areintendedfor R C 3 Precision running fits a r e a b o u t t h e c l o s e s t partswhicharenormallystationary,but to runfreely, f i t sw h i c hc a nb ee x p e c t e d which can be freely assembled or d i s a s s e m and are htended for precision work at slow bled. They run from snug fits for parts respeeds and light journal pressures, but are of location,throughthe quiring accuracy not suitable where appreciable temperature fits for p a r t ss u c h as mediumclearance CO be encountered differencesarelikely ball,raceandhousing, to t h e looser fasR C 4 C l o s e running fits areintendedchieflyfor tenerfitswherefreedom of a s s e m b l y i s of runningfitsonaccuratemachinerywith primeimportance. moderatesurfacespeedsandjournalpressures, where accurate location and minimum LT Locationaltransitionfits a r e a compromise between clearance and interference fits, for play is desired. of location is applicationwhereaccuracy important,buteither a smallamount of R C 5 Medium running fits are intended for higher c l e a r a n c e or interference is permissible. running speeds, or heavy jaurnal pressures, R C 6 or both. F'G.

GRRUAN~~EA~RR5E~~:NSCENCfAETAIROANNOCFE IN TABLE 5)


t

R C 7 Free running /its are intended for use where or wherelarge a c c u r a c yi sn o te s s e n t i a l , to beentemperaturevariationsarelikely countered, or under both of these conditions.

2 : !

Y

a

O - 1

-2

R C 8 ) L o o s e running fits are intended for use (wherewidecommercialtolerancesmaybe necessary,togetherwithanallowance,on RC member.external the

.

SCLLE FOR Ai THOUSANDTHS DIAMETER OF OF ONEANINCH W H

FIG. 3 GRAPHICAL REPRESENTATION OF STANDARD LOCATIONAL TRANSITION FITS (SHOWN IN TABLE 7 )

5


"_

Continued on page 12


ASME B4.L

67 W 0759b70 057162L T2b

m

USA STANDARD

TABLE 5 RUNNING AND SLIDING FITS Limits are in thousandths of an inch. Limits for hole and shaft are applied algebraically to the basic size to obtain the limits of size for the parts. Data in bold face are in accordance with ABC agreements. Symbols H5, g5, etc., are Hole and Shaft designations used in ABC System (Appendix 1).

Nominal Size Range Inches Over

To

o

-0.12

a 12 - 0.24

0.71

- 0.40 - 0.71 - 1.19

1.19

- 1.97

1.97

- 3.15

3.15

- 4.73

4.73

- 7.09

7.09

- 9.85

0.24 0.40


9.85-12.41 3.0 + 2.2

12.41-15.75

O

6-6

4.0

15.75 -19.69 '

C

2.5

- 3.0 - 4.4 - 4.0

~~

2.5 8.2 2.8

+ 3.5 ~-2.5 O

+ 4.0

- 4.7 -

2.8

19.69-30.09 30.09 -41.49

56.19 -76.39 76.39-100.9 100.9

-13 1.9

131.9 -171.9 171.9

-200

+ 2.0 o 5.7 3.0 + 2.5 O 7.1 4.0 + 3.0 O 9.0 5.0 t 4.0 O 11.5 6.0 + 5.0 2.5

14.0

8.0 18.0

O

+

6.0 O

- 2.5 - 3.7 - 3.0 - 4.6

-- 64.0.0

- 5.0 - 7.5 - 6.0 - 9.0 - 8.0 -12.0

2.5 7.5 3.0 9.5

+ 3.0

4.0

+ 5.0

12.0 5.0 15.0 6.0 19.0

8.0 22.0

- 2.5

+

6.0

O

+

- 4.5 - 3.0 - 5.5 - 4.0 - 7.0 - 5.0 - 9.0

8.0

- 6.0

o

+ 4.0 O O

O

+10.0 O

8.0 !6.0 0.0

+ 5.0 O

+

6.0

- 8.0 -11.0 -10.0

- 8.0 8.0 +-6.O O -13.0 21.01 10.0 I +10.0-10.0

O

-26.0

-11.0 - 8.0 -12.0

Continued on page 7

6




--``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---

41.49 -56.19

PREFERRED LIMITS AND FITS

--``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---

T A B L E 5 RUNNING AND SLIDING

FITS (continued from p a g e 6 )

Limits are in thousandths

<

of an inch.

L i m i t s for hole and shaft are applied algebraically to the basic size

to o b t a i n t h e l i m i t s of s i z e for t h e p a r t s

Data in bold face are in accordance with ABC agreements Symbols Hg, e7, etc., are Hole and Shaft designations used in ABC System (Appendix C l a s s RC 5

6

C lRa C ss

7

C lRa C ss

Class RC 9

8

C lRa C ss

'm

I

4.0

7.0

-

tt +

3do

I

-

-

--

+ 3.5 -

-

6.0 8.2

6.0 17.5

+ 6.0 - 6.0 0

-

7.5

2.0 3 .0 2.5 3.7 3.0 4.6 4.0 13.5 5.8 5.0 7.2 6.0 8.5 18.0

10.0 19.5

+

-

-

o 4.5 O - 79.: 5.0 O 6.0 O

1

-

8.0

11.0 10.0 13.5

I

I

2.8 O 3.5 O 4.0 O 4.5 O 7 . 0 + 5.0 15.5 O 8 . 0 + 6.0 3.5+ 7.9 4.5 + 10.0 5.0 + 11.5 6.0 +

40.0

-

-

3.5 5.1 4.3 6.3 5.0 7.5 6.a 9.a 7.d 10.5 8.0 12.0

-33.0

1

-30.0 -40.0 -35.0

"47.0

45.0 +40.0 -45.0 o -70.0

11O.O

80.0 +40.0

145.0

O

O

-

-

5.0 16.7 6.0 12.87.0 15.5 ~~

2.51-

-

-

4.0

o

+ 4.0 + 5.0 -

+

3.5

O

+

+

-

5.0

l2O0 -

1-19

0.711.191.97

15.: 12.0 18.0 15*0 22.0 18.0 26.0

12.0 O

-

+

20.0

+

25.0

+

30.0

- 30.0 - 42.0 - 40.0 - 30.0956.0 41.49 - 50.0 - 70.0

-

0.24

0.400.71

8.8 7.0 10.5

-3.15 1.9713.5 - 10.

o -

O '0 10.0

0.12

0.240.40

6io1 l!)i 7.0 - 9.0 O

-

0.12-

1- 1/I l.:

t:!

3.154.73

4. 73-

7-09

7.09-

9.85

9.85-

12.41

14.C

20.C 16.C 22.C

-- 20.c 28.C - 25.C -

~

1: 9.0

Over To

H 1 1 IShaft Hole I

20.5 10.0 + 24.0 12.0 + 28.0 15. + 34.: - 12.0 18.0 + - 17.E 38.0 l

25.0 t16.0 O - 35.C 51.0 - 30.C 30.0+20.0 62.0 O 42.C 40.6 +25.0 - 40.C O - 56.C 81.0 50.0+30.0 - 50.C 100 O - 70.C 60.0 +40.0 - 60.C 125 O - 85.c 80.0 +50.0 - 8O.c 1160 o -110 - 80.0 100 +60.0-100 -105.0 200 o 1-140

-

"25.0

1-25.0 -45.0 -61.0 O

o

10.0 + 7.0 21.5 O 12.0 + 8.0 25.0 l O 14.0 + 9.0 29.0 O 16.0+10.0 32.0 O

20.0+12.0

:15.:1 1-

-26.0

1

-

26.0 25.0 +12.0 - 25.0 33.0 30.0 +16.0 30.0 - 40.0 - 40.0 40.0+20.0 72.0 - 52.0 50.0 +25 O - -50.0 91.01 d - 66.0 - 60.0 60.0 +30.0

~

45.0 86.0

1.6 O 2.0 O 2.5 O 3.0 O 3.5 O 4.0

1

I

-

t

67.0

I

8.0

-10.5 -10.0 .O -13 -12.0 I -16.0 __ -16.0 -21.0 -20.0

22.0

I

Nominal Size Range Inches

ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ -

tt

1

I

I

1 . 2 1.2 + 1 . 6 - 1.2 2.0 + 1.9 3.8 - O - 2 . 2 4.6 1.6 1.6 + 2.0 - 1.6 2.5 + - 2.4 4.8 - O - 2.8 5.7 - 2.0 2.0 + 2.5 - 2 . 0 3 . 0 + - 3 . 0 6.1 O 3.6 7.1 2.5 2.5 + 3 . 0 - 2 . 5 4.0 + - 84 . 83 -3.7 7.3 - 0 - 3.0 3 . 0 + 3.5 - 3.0 5.0 + - 4.4 8.7 - O 5.2 10.7 - 3.53.5 + 4 . 0 - 3.56.0 + - 5.1 10.0 o 6.0 12.5 - 4.4. + 4 .45.. + I - 11.; 5.; O - 6.; l i . ! 5.0 5.0 + 5.0 5.0 8.0 + 7.0 13.n 8.0 1 16.0 I -,.- n-

t1;: 6.0

1

i!I+

J-

I

I).

30.0 62.0 40.0 81.0

50.0 L O0

O0 !O0

O O O

19.69- 30.07

4 1.49- 56.19

-100 100.9 -131.9 I + 60.0 1-140 I O

131.9-171.9

I I

E n d of Table 5

7



USA STANDARD

TABLE 6 LOCATIONAL CLEARANCE FITS Limits are i n thousandths of an inch. Limits for hole and shaft are applied algebraically to the basic size to obtain the limits of size for the parts. Data in bold face are in accordance with ABC agreements. Symbols H6, h5, etc., are Hole and Shaft designations used in ABC System (Appendix I). ~~

Class LC Nominal Size Range Inches

2

I

Class LC 5

Class LC 4

Class LC 3

Standard

Standard Limits

%$

Over 0

-

+

O 0.12

-

0.45

I

12-41-. 15-75-

12'41

1.3

O

+0.4

+ O

-

-0.2

-0.25

O

+0.4

-

O

+0.5 0

-

-

O

+0.8

-

-

0.4

+

O

- 0.5

O

+ 0.6 - 0 O + 0.7 + o 1.2 - o 0.5 o + 0.9 t o O

1

o

+0.9

+ O

1.5

- O

-0.62.3

O

+1.0

+ O

1.7

O

2.0

I

- O

2.1

O 2.4

19-69

O 2.6

I

-0.7 2.6

+1.2

+ O

- O

-0.83.0

I o I-

15-75

+1.2

O

+1.4

-

0

+1.6

- O

+ o

1-0.9

+

O -1.0 + O -1.0

O

+1.4

O

+1.6 - O I +1.8 -O

I

O

IoI

+2.0

3.2 - O

O

+ O - 0.9

- O

+2.2 3.6 0

-

O +2.5 4.1 - O

I

+

O

+

O

- 1.0 - 1.2

I-+

+

+

o

1.2

O 1.4 O

- 1.6

o

3.6

O 4.1

O

I+

0.K 0.751

0

+ 0.4 1 - 0.1 - O

I

-

O

+

5

O

16.0

+ 8.0 +

-0 +10.0 -O

O -5.0 + O

-6.0

O

20 36

O

+12

-

0

+16

-

O

+

-

+

O 8 O

-10

- 0.4 - 1.1 - 0.5

2.8 t

O 3.0

-

- 1.4 - 0.6 - 1.6

-

0.6 1.8 0.7 - 1.9 - 0.7 - 2.1 - 0.8 - 2.4

o

1.8

+ o

- 2.0 O - o - 2.2

- 0

7o +

5.7

o

6.5

3.5 +

+ 4 - O + S - 0

+ o

- 2.5

+

- 3

O

I

I

-

O +12.0 20 - 0

1

+

I

I

O

"8

0.9

+

3.0

5 . 9 - 0

+ 6

- o

+ E

-

o

+12

-

+20

-

o 32 O

41

O

- 7.6

1.8

- 9.8 - 1.8

O

+25

-

1.4

- 6.4 - 1.6.

-o +16 -O -

2.9

- 4.2 - 1.2 - 5.2

-O

+10

-

0.9

- 1.0 - 3.5 - 1.2

o

20 O 26 O 13 .O

+

I- 0.35 - 0.15 - 0.45 - 0.2 - 0.6 - 0.25 - 0.65 - 0.3 - 0.8 - 0.4 - 1.0

+ 2.2 t o - O 1.4 + 2.5 + o - 'O - 1.6

4.6

8 O 10 O 13

56.19

- 171.9 - *Oo

6

- O -

o +

16

l3l.9

O +16

0.6 1.0 t o 0.7 1.7 - O o + 1.2 t o - 0.8 2 - 0 O + 1.6 t o 1 2.6 - O -__ O + 1.8 t o 3 - 0 - 1.2 1.5

o

4 1.49-

2.61-


4'73

7*09

9*85"

-0.4

+o

0.9

9*85

+ O

O

+0.3

O

7.09-

1.1

- O

0.7

4.73-

O

O

O

3*15-

-0.3

O

-0.2

0.5

0.65

'm7'-

+ O

O + 0.4 + O 0.65 - O "0.25 O +0.5 + O 0.8 - O - 0.3 O +0.6 + O 1.0 - O - 0.4 O +O.? + 0

+

0.25

-11.8

O

Continued on page 9

8




--``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---

To

R

C l a s s LC 2

1

~~~~~

ASME B 4 . L

67

m 0759670 O573624 735 m


T A B L E 6 LOCATIONALCLEARANCEFITS(continued Limits are in thousandths of an inch. L i m i t s for hole and shaft are applied algebraically

from p a g e 8 )

to t h e b a s i c s i z e to obtain the limits of size for the parts.

D a t a i n bold face are in accordance with ABC agreements. Symbols H9, f8, etc., a r e H o l e a n d S h a f t d e s i g n a t i o n s u s e d i n ABC Systrm (Appendix I).

Class LC 6 Standard Limits

c e, 0 U

m =

.g.- 29

0.6 3.2 0.8 4.0

+

+

+

+

S9

:E 2

1.0'- 0.3 O -0.9 1.2 - 0.4 O - 1.1 1.4-0.5 O - 1.4

0.6 3.2 0.8 3.8 1.0 4.6

+

1.6-0.6 O - 1.6 2.0 - 0.8 O -2.0

1.2 5.6 1.6 7.1

+

H7

+

Standard Limits

E

Shaft f8

Hole

0.3 1.9 0.4 2.3 0.5 2.8

5

az

+

+

+

Shaft

e7

- 0.6 -1.6 - 0.8 - 2.0 - 1.0 - 2.4

2.8 - 1 . 2 O - 2.8 3.5 .- 1.6 O -3.6

2.0 + 4 . 0 - 2 . 0 1.0 + 2 . 5 - 1 . 0 O - 2.6 8.5 O - 4.5 5.1 1.2 + 3.0 - 1.2 2.5 + 4.5 2.5 O - 3.0 10.0 O - 5.5 6.0

1.4 1.6 8.1 2.0 9.3 2.2 10.2 2.5 12.0 2.8 12.8

3.0 16.0

+

3.0 11.5 4.0 - 1.6 3.5 O - 4.1 13.5

+ 4.5 - 2.0 O - 4.8 + 5.0 - 2.2 O - 5.2 + 6.0 - 2.5 O - 6.0 + 6.0 - 2.8 8.0

- 3.0

0 - 8.0 +10.0 - 3.5

- 3.0 O - 6.5 6.0 - 3.5 O - 7.5

4.0 i~ 7.0 15.5 O 4.5 + 8 . 0 17.5 O 5.0 20.0

+ +

O - 6.8 21.0 +

+ 5.0 +

Hole H10

c

Shaft d9

+ 1.6 -1.01.0 3.6 - 0 1.2 + 1.8 - 1.2 4.2 - O - 2.4 1.6 t- 2.2 - 1.6 5.2 - O - 3.0

Standard Limits

~

;z '2 5 26

Hole H11

Shaft c10

2.5 + 2 . 5 6 . 6 - - 2 O. 0 2.8 + 3 . 0 7.6 - O 3.0 + 3 . 5 8.7 - O -

3.5 + 4 .0 2.0 + 2 . 8 - 2 . 0 6.4 - O - 3.6 10.3 - O 2.5 + 3.5 - 2.5 4.5 + 5 .0 8.0 - 0 - 4 . 5 1 3 . 0 - O -

y.

2

-2

'B 2 ZÜ

Stand.ard Limlts

O

.e $ 2s

Shaft

I-

2.5 4 + 4 4 4.1 12 - 0 , - 8 2.8 4.5 + 5 - 4.5 4.6 14.5 - O - 9.5 3.0 5 + 6 - 5 5.2 17 - O 11

5 + 6 - 5 3.0 + 4 . 0 - 3 . 0 9.5 - O - 5.5 15 - O - 9 6 + 7 - 6 4.0 + 4.5 - 4.0 11.5 - O - 7.0 17.5 - O - 10.5

6 + 7 - 6 20 - O - 13 7 + 8 - 7 23 - O - 1 5 8 t 1 0 - 8 28 - O - 18 10 + 12 IO 34 - O - 22 11 + 14 - 11 39 - O - 25 + 16 12 - 12 44 - O - 28

Hole

Shaft

6 0-11 6 6 + 7 13 20 - O 7 + 9 7 25 - O - 16

0

8 +lo- 8 28 - O - 18 lo l2 34 - O

' x i!

0.71

12+16-12 44 - O - 28 14 + 18 - 14 50 - O - 32

4.0 8.5 4.5 9.5

5.0 + 5.0 - 5.0 13.5 - O - 8.5 6 + 6 -6 16 - O -10

7 + 9 - 7 21 - O - 12 8 + 10 - 8 24 - O - 14

+ 7 7- 7 18.5 - O -11.5 7 +8 -7 20 - O "12

10 + 12 29 - O 12 + 12 32 - O

8 +9 9.0- 5 O -11 23 - O 9 10.0- 55.0 -O O 25 -11

6.0 +12.0 - 6 26.0 - 0 -14 7.0 +16.0 - 7

-8 -14 -9 -15

10

+12

-10

-30

-O

-18

12

+16

-12

10 17 12 20 14 - 23 - 16 - 26

16 + 18 - 16 52 - O - 34 20 + 20 - 20 60 - O - 40 22 + 22 - 22 66 - 0 - 44 25 + 25 - 25 75 - O - 50

-

28 + 30 - 28 88 - O - 58 30 + 40 - 30

14 -

14 + 37 - O +1016 + 16 42 - O

18 + 20 50 - O 20 + 2 5

18 30 20

I

O"'

-

1.19

3'15

3-15 - 4.73

4.73 - 7-03 "O7

-

9.85

3.85 - 12.41

","

12.41

* I;!

35 115 - O +

-

l.'"

22 + 28 - 22 78 - O - 50 28 + 30 - 28 58 88 - 0 3 :-

0.12

-

+ 22 -1616 60 - O - 38 18 + 25 - 18 68 - O - 4 3

lg ~

-

I

-

To

Over

H13

5 + 17-

-

3.5 6.3 4.5 8.0

2

2 s

Hole H12


Standard Limits

LI

- 15.75

15.75 - 19.69

40 + 50 13.69- 30.09 140 - 0 - 45 I 45 + @ 30.09- 41-47

$

--``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---

3.5

+ 3.5 - 1.4 O - 3.6

5 -IZ

'B .-

Standard Limits

Class L C 11

ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ -

7.1

O U

2:

Hole H10

1.6 O 1.8 O 2.2 O

c

C l a s s LC 10

Class LC 9

Class LC 8

Class LC 7

End of T a b l e 6

9




4.73

-

-

-

-

-

-

- 12.41

- 15.75

-

0.71

1.19

1.97

3.15

4.73

7.09

9.85

12.41

15.75


3.15

-

0.40

19.69

9.85

7.09

1.97

1.19

0.71

0.40

-

0.24

0.24

0.12

-

-

TC

0.12

0

over


Limits

and

Class

Symbols

a.6

-0.4

I 1 +2.0

1+1.4

1

H7,

I 1 +0.6

1 +0.4

+0.3 -0.3

shaft

LT

,) represents

hole

3:: I -0+le2I

“Fit

for

the

1 +3.0

I-l.0

bold

+0.6 -0.6

2

1 +l.O

I

I 1 +0.7

I

LT

Hole

interference ate

in

algebraically

Limits

-

-0

t2.5 -0

z.8 t2.3

+2.2

-1.6

t2.0

-0

-0

t1.6

+2.0

+1.8

-1.4

t1.8

+1.6 -0

-1.1 t1.5

-1.4

-0

t1.3

+1.4

-1.0

-0.8 -0

+1.2

-0.7 +0.9 tl.1

-0

+l.O -0

to.7

+0.8

+2.5

+3.4 +1.8

LT

5

wto.4

-2.0

-1.7 +0.3

Class

LT

+1.7

6

:-i-1 +I.0

+1.41+2/i-

I

-0 +0.7 t1.2 +2.0 - 0 + 0.8

f1.0

parts.

+o.z

+ 1.8

+ 1.6 +0.2

t1.4 fO.2

+0.2

+1.4

+O.l

-0

Gi”L6”1+1.4

End

of Table

;‘,::

Xii

61 +2.8

7

- -i-I Y , +I.2

-

1' QI +3.2

-3,4 f0.7

Class

I).

values).

mating

to.4 -2 3

t2.7 to.2

(plus (Appendix

the

~1

-0

4

clearance System

for

-2.8

LT

ABC

size

t1.1

in

of

+.O.l

.+4.0

Class

used

maximum

ABC

agreements.

the

with

-2.7 -3.8

and

limits

the

FITS

to obtain

inch.

-2.4 +0.4

+l.O

+O.l

+0.8

+O.l

+0.7

+O.l

+0.6

+O.l

+ 0.5

-0.6

+O.l

+0.6

Shaft k6

3

+0.5

Standard Limits

LT

designations

size

of an

TRANSITION

, AI.5 +0.7 , to.6 -0

-0.5

values)

accordance

basic

thousandths

fble H7

Shaft

Class

to.5

Fit

in

(minus

are

to the

in

-0

-

and

face

ate

7 LOCATIONAL


I

1+2.2

I +1.80

I

l-0.7

+2.4 -0.6

Class

etc.,

maximum

Data

applied

js6,

I

I

ate

TABLE


--``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---

ASME B4.L

b7

m

0759b70 0573626 5 0 8

P R E F E R R E D LIMITS AND FITS

TABLE 8 LOCATIONAL INTERFERENCE FITS Limits are in thousandths of an inch. Limits for hole and shaft are applied algebraically to the basic size to obtain the limits of si ze for the parts. Data i n bold face are in accordance with ABC agreements, Symbols H7, p6, etc., are Hole and Shaft designations used in ARC System (Appendix I).

0.24 -

0.40


100.9

-13 1.9

131.9 -171.9 171.9

-200

+ +

6.0 0

8.0

2 18

- 0

4 24

+10.0 - 0

30

4

11

+18 - O +12 +24 +12 - O +16

15 31 18 38

+10

+30 - O +ZO

24 50

+16 - O

+10

+16

- O

+31 +25

+12

+38

-

O +30 +50 +40

End of Table 8

--``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---



USA STANDARD Continued from page 5

9. ModifiedStandard Fits

2 0 m -3 -2

9.1 Bilateralholeorbasicshaftsystemfits havingthe same amounts of c l e a r a n c e or interference remain the same as those shown in Tables 5 to 9 , but the limits of s i z e a r e c a l c u l a t e d f o r h o l e s or shafts and differ from those shown in the t a b l e s . T h i s may be accomplished by one of the following:

L N Z L N J

HOL ES

=WAFTSSCALE:THMISANOTHS OF ANINCH FOR A DIAMETER OFONEINCH

-

FIG. 4 GRAPHICAL REPRESENTATION OF STANDARD L O C A T I O N A L I N T E R F E R E N C E F I T S (SHOWN I N T A B L E 8)

LN

(a)Bilateralholes (SymbolB)-Thiswillres u l t in nonstandard holes and shafts. (b) A basic shaft system (Symbol S)-This will result in nonstandard holes and shafts.

Locationalinterferencefits areusedwhere accuracy of location is of prime importance andforpartsrequiringrigidityandalignment with no special requirements for bore fits arenotintendedfor pressure.Such partsdesignedtotransmitfrictionalloads from oneparttoanother by virtue of the t i g h t n e s s of fit, a,s theseconditionsare covered by force fits.

9.2 BilateralHole

Fits (Symbol B). T h e common c a s e is where holes are produced with fixed as drillsorreamers;toprovidea tools,such longer wear life for such tools a bilateral tolera n c e is desired.

8.3.3 Force Fits. F o r c e or shrink fits constitute a special type of interference fit, normally characterized by maintenance of constant bore pressuresthroughouttherange of s i z e sT. h e interference therefore varies almost directly with diameter, and the difference between its minimum is smalltomaintainthereandmaximumvalue sulting pressures within reasonable ‘limits. T h e s e f i t s may be described briefly a s follows:

The symbols used for these fits are identical withstandardfitsexceptthattheyarefollowed by the letter “B.” Thus “LC4B”is a locational clearance fit, class 4, except that is is produced with a bilateral hole.


The limits of c l e a r a n c e or interference are iden5 to 3 forthe tical with those shown in Tables corresponding fits.

FN 1 Lightdrivefits arethoserequiringlight or assemblypressuresandproducemore less permanent assemblies. They are suitor long fits, or in ableforthinsections cast-iron external members. FN 2 Medium drive fits are suitable for ordinary s t e e l p a r t s or forshrink fits onlight sections. They are about the tightest fits that c a n be usedwithhigh-gradecast-ironexternal members. FN 3 Heavydrivefits aresuitableforheavier steel p a r t s or forshrinkfitsinmedium sections. Force f i t s are suitable for parts which can or for shrink fits where be highly stressed pressing forces required are

The hole tolerance is changed s o that the plus limit isthatforonegradefinerthanthevalue showninthetables,theminuslimitequalsthe amount by which the plus limit was lowered, and theshaftlimitsarebothlowered by thesame amount asthelowerlimit of s i z e of thehole. Thefinergradeoftolerancecanbefoundin T a b l e 4.

9.3 BasicShaftFits

(Symbol S). For t h e s e f i t s the maximum s i z e of the shaft is basic and the a l l o w a n c ei sa p p l i e dt ot h eh o l e .T h el i m i vo f c l e a r a n c e or interference are identical with”@se 5 to 3 forthecorresponding showninTables. fits. The symbols used for these fits are identical with those used for standard fits except that “S.” T h u s “ L C theyarefollowedbytheletrer 4, e x 4 s ” is alocationalclearancefit,class cept that it is produced on a basic shaft basis.

FNS

3 W

2”-FNI

T

I

$

0

FN2

FN3

FN4 I

T h e limits for hole and shaft as given in Tables 5 to 9 areincreasedforclearancefits, or dec r e a s e d for transition or interference fits, by the value of theuppershaftlimit;thatis, by the amount required to change the maximum shaft to the basic size.

FIG. 5 GRAPHICAL REPRESENTATION OF STANDARD FORCE OR SHRINK FITS (SHOWN I N T A B L E 9 )

12




--``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---

f

~~

~~

ASME 84.1 67 0759670

0573628 380

P R E F E R R E D LIMITS AND FITS

9.4 If s t a n d a r d s t o c k s i z e s or special conditions r e q u i r et h ?u s eo fo t h e rh o l es i z e sa n ds h a f t sizes, reference should be made for the required I which are taken fit to tables in Appendix the ABC proposal.

LAPPING

froh

a

HONING

CYLINDRICAL GRlNOlN SURFACE GRINDING DIAMONDTURNING DIAMOND BORING BROACHING

10. Machining Processes.

REAMING TURNING

To indicatethemachiningprocesseswhich may normally be expected to produce work within thetolerancesindicated by thegradesgivenin this Standard, Fig. 6 has been provided. This information is intended merely as a guide in selecti n gs u i t a b l ep r o c e s s e s for a particulargrade.

BORING MILLING PLANING B SHAPINC DRILLING

D

FIG . 6 MACHINING PROCESSES


13

--``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---



USA STANDARD T A B L E 9 FORCE ANDSHRINK Limits are in thousandths

FITS

of an inch.

L i m i t s for h o l e a n d s h a f t a r e a p p l i e d a l g e b r a i c a l l y t o t h e b a s i c s i z e Data in bold face are in accordance with

to obtain the limits of s i z e for the parts. ABC agreements.

I).

Symbols H 7 , s6, etc., are llole and Shaft designations used in ABC System (Appendix

I

C l a s s FN 1

C l a s s FN 2

I

C l a s s FN 3

C l a s s FN 4

I

C l a s s FN 5

Inches

To

Over O

-

0.12

0.12

-

0.24.

I 0.05

0.1

1.97

-

2.56

2.56

-

3.15

3.94

-

4.73

4.73

-

5.52

5.52

-

6.30

6.30

-

7.09

I I

ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ 1.1 2.6 1.2 2.9 1.5 3.2 18 3:5

7.88

-

8.86

8.86

-

9.85

3.8 2.3 4.3 2.3 4.3

- 17.72

4.4 7.0

7.09

15.75

7.88

Continued on page

14 --``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---




15


T A B L E 9 F O R C E AND SHRINK FITS (Continued

from p a g e 14)

L i m i t s a r e i n t h o u s a n d t h s of an inch. Limits f o r h o l e a n d s h a f t a r e a p p l i e d a l g e b r a i c a l l y

of size for the parts.

to t h e b a s i c s i z e t o o b t a i n t h e l i m i t s

face are in accordance with ABC agreements.

Symbols H7, s 6 , etc., are Hole and Shaft designations used in ABC System (Appendix

C l a s s FN 2

Class FN 1 Nominal Size Range Inches To

Over

19.69

- 24.34

24.34 - 30.09 30.09 - 35.47 35.47 -41.49,

cru o g

: E ! Ëa ._ 9

48.28 - 56.19 56.19 -65.54 65.54 - 76.39 76.3 9 - 87.79

O '

Hole Shaft H6

'

2 2

.* al E2 22

z:

-u

Y &

Hole

H7

+

2.0 - O t 2.0 - O

+

9.2 8.0 +10.2 + 9.0

9.0 14.0 11.0 16.0

+

7.5 11.6

+

tll.6 +10.0

14.0 20.5 16.0

+ 4.0 - O

16.0 13.0 18.0

2.5 - O + 2.5 - O + 3.0 - O + 3.0 - O

14.0 20.5

t 4.0 - O

+20.5 24.0 +18.0 34.0

+

+

+2/r.5 29.0 +22.0 39.0 +28.0 32.0

t 6.0

+

C l a s s FN 3

Standard Limits

al

6.0 9.2 7.0 10.2

3.0 - O + 3.0 - O

'

Shaft s6

+

+

:$$

ds

Standard Limits __ Hole Shaft H7 c6

14.0 15.0 + 3.0 12.0 20.0 - O 16.0 17.0 + 3.0 14.0 22.0 - O

+

+ + +

Class FN 5

Class FN 4 Standard Limits

$g

23

Hole H7

20.0 22.0 + 18.0 27.0 22.0 27.0 + 20.0 32.0 -

3.0 O 3.0

+ + O + 20.5 21.0 + 4.0 t 27.5 31.0 + 4.0 + 18.0 27.5 - O + 25.0 37.5 - O + 22.524.0 t 4.0 + 30.5 36.0 + 4.0 + 20.0 30.5 - O + 28.0 43.5 - O + 25.0 30.0 + 5 . 0 + 38.0 45.0-t 5.0 + 22.0 38.0 - O + 35.0 53.08.- O + 28.0 35.0 + 5.0 + 43.055.0 + 5.0 + 25.0 43.0 - O + 40.0 63.0 - O + 34.0 39.0 t 6.0 t 49.0 64.0 + 6.0 + 30.0 49.0 - O -t 45.0 74.0 - O + 39.044.0 + 6.0 + 54.0 7 4 . 0 + 6.0 +/35.0 54.0 - O + 50.0 84.0 - O + 45.0 52.0 + 8.0 + 65.082.0 + 8.0

Shaft u6

+

+

+ + + +

Standard Limits

'i;

22

$: 9

Hole H8

30.0 + 38.0 35.0 + 43.0 -

11.0

18.0 24.5 20.0

4.0 - O + 5.0

+13.6 +12.0 22.5

17.0 +14.0 25.0 +18.0 20.0 +16.0 28.0 +lG.O

+ 4.0 - O + 5.0

- O + 5.0

I -

O

6.0 - O

- O

+

8.0

+ +

+ + +

+

+

38.0 35.0 43.0 40.0

37.5 44.0 + 6.0 35.0 54.0 - O 43.5 54.0 + 6.0 40.0 64.0 - O 53.0 62.0 + 8.0 50.0 75.0 - O 63.0 72.0 + 8.0 60.0 85.0 - O

+ + +

54.0 50.0

+

85.0 80.0

+ + +

64.0 60.0 + 75.0 + 70.0

+

+

90.0 +10.0 106 - O

+lo6 +lo0

84.0 110 +10.0 +126 80.0 126 - O 95.0 128 +12.0

+120 +148

t 74.0 t 70.0

+ + +

Shaft x7

'

5.0 O 5.0 O

27.0 25.0 32.0 30.0


9.5

13.6 41.49 -48.28

Standard Limits

1).

87.79-100.9 100.9 -1 15.3

115.3 -13 1.9 131.9 - 1 5 2 . 2 152.2-171.9 171.3 -200 End of T a b l e 9

15



--``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---

Data in bold

ASME 84.1 b7

0759670 057Lb31 975

APPENDIX

I

--``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---





ASME 84.3 67

m 0759670 0573632 B O 3

W

APPENDIX I Limits for Holes C to X (Continued from p a g e 16) Tolerance Unit 0.001 in. U-Upper Limit L-Lower Limit

N -4

d .Y

E

.M

I

O

7

o. 1 0.3 0.0

8

u+ 0.0

6

-

L-

6

L- 0.6 -

N

-

8

9-1 1 9 10 11

ULUL-

0.2

0.4 o. 1 0.5 u- o. 1 L- 0 .7 U- 0.0 L- 1.0 L- 1.6 ~

7

0.4

~

L- 2.5

P


R --``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---

6 - LU7 L-

"I-

6 7

6

U

-

i + ... ... u- ... L- ... uL-

+ UL-

0.c

O.$

* 7

6

V

0.8 0.5 0.E

7

uL-

O.( 1.c

L-

...

... L U- L- 1.1

0.5 1.;

-



APPENDIX I

LIMITS FOR SHAFTS c to x Tolerance Unit 0.001 in. U-Upper L-Lower Limit Limit

Y W

l d

c m C

11.5 14.0 119.0 19.0

;::

d

I I I 10.0 12.0 15.0 7.0

I

11.5 14.0 17.0 8.0 22.0

I

13.0 15.0

9. O 19.0 25.0

e

ｗｗｗ．ｂｚｆｘｗ．ｃｏｍI

0.7

1 1 1:;

1.6

1.8

4.4

6.0

4.8

0.6 1.4

3.5 6.0 6.0

I

I

I

4.0 6.0 6.0

0.8

0.7 1.4 1.7

1.2

I

I [

4.5 7.0 7.0

I

I

I

5.0 8.0 8.0

Continued on page 19

18 --``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---




--``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---

APPENDIX I

LIMITS FOR SHAFTS c to x ( c o n t i n u e d from p a g e 181 Tolerance Unit 0.001 in. U-UpperL-Lower Limit Limit

I

I I

D i a m e t e r s Over: To (Inches)


End of Table

19



APPEND1X I I TO 98 F

LENGTH DIFFERENCES PER lNCH FROM STANDARD FOR TEMPERATURES 38 Temperature 5 Deg F

t

1

38 39 40 41 42 -25 -23

-18

--``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---

16 '17

-27 -26 -2 4

-22 -2 1

-60 -58 -56 -54 -52

-84 -8 1 -78

-120 -116 -1 12 -108 -104

-1 50 -145 -140 -135 -130

-300 -290 -280 -270 -260

-450 -43 5 -420 -405 -3 90

-600 -580 -560 -540 -520

-750 -725 -700 -675 -650

-900 -870 -840 -810 -780

-50 -48 -46 -44 -42

-75 -7 2 -69 -66 -63

-100 - 96 - 92 - 88 - 84

-125 -120 -1 15 -1 10 -105

-250 -240 -230 -220 -210

-375 -360 -345 -3 30 -315

-500 -480 -460 -440 -420

-625 -600 -575 -550 -525

-750 -720 -690 -660 -630

-40 -38 -36 -3 4 -3 2

-60 -57 -54 -5 1 -48

- 80 - 72 - 68

-100 - 95 - 90 - 85 - 80

-200 -190 -180 -1 70 -160

-300 -285 -270 -255 -240

-400 -3 80 -3 60 -3 40 -320

-500 -475 -450 -425 -400

-600 -570 -540 -510 -480

- 60 - 56 - 52 - 48 - 44 - 40 - 36 - 32 - 28

-

- 70 - 65 - 60

-150 -140 -130 -120 -Il0

-225 -2 10 -195 -180 -165

-300 -280 -260 -2 40 -2 20

-375 -350 -325 -300 -275

-450 -420

-3 90

-

-100 - 90 - 80 - 70 - 60

-1 50 -135 -120 -105 - 90

-200 -180 -160 -140 -1 20

-250 -225 -200 -175 -1 50

-300 -270 -240 -210 -180

-90 -8 7

48 49 50 51 52

-20 -19

53 54 55 56 57

-1 5

-14 -13 -12 -11

-3 O -28 -26 -24 -22

-45 -42 -3 9 -3 6 -33

58 59 60 61 62

-10 -9 - 8 - 7 -6

-20 -18 -16 -14

-30 -27 -2 4 -2 1 -18

66

15

-28

43 44 45 46 47

63 64 65

10

-30 -29

67 68 69 70 71 72 73 74 75 76 77 78

-17 -16

6

degree F, X 10 4 2 3 15 10 3020 25 Total change in length from standard, microinches per inch of length* Coefficient of thermal expansion of material per

-12

- 76 -

64

-

24

75

- 55

-

50 45 40 35 30


79 80 81 82 83

84 85 86 87 88 89

94 95

-

5 4 3 2

- 1 O

1 2 3 4 5 6 7 8

9

11

12

13 14

18 19 20 21

97

26 27 28 29

98

30

96

-10

- 8

- 6 - 4 - 2

O

-15 -12

-9 - 6

- 3 O 3 6 9 12

- 20

- 16 - 12

- 8 - 4

- 25

- 20 - 15 -

10 5

- 50

40 - 30 - 20 10

-'

- 75 -

60 45 30 15

-100 - 80 - 60 - 40 - 20

-125 -100 - 70 - 50

-

25

O

O

O

O

O

4 12 16 20

5 10 15 20 25

15 30 45 60 75

20 40 60 80 100

25 50 75 1O0 125

90 105 120 135 150

120 140 160 180 200

150 175 200 225 2 50

10 12 14 16 18 20

21 24 27 30

18

24 28 32 36 40

30 35 40 45 50

22 24 26 28 30

33 36 39 42 45

44 48 52 56 60

55 60 65 70 75

110 120 13O 140 150

165 180 195 210 225

2 20 240 260 280 3 O0

275 300 325 350 375

32 34 36 38 40 42 44 46 48 50

48 51 54 57 60 63 66 69 72 75

64 68 72 76 80 84

80 85 90 95 100

92 96 1O0

105 110 115 120 125

240 255 270 285 300 3 15 33O 345 3 60 375

320 3 40 3 60 3 80 400 420 440 460 480 500

52

78 81 84 87 90

104 1O8 112 116 120

130 135 140 145 150

160 170 180 190 200 210 220 230 240 2 50 260 270 280 290 300

3 90 405 420 43 5 450

520 540 560 5 80 600

400 425 450 475 500 525 550 575 600 625 650 675 700 725 750

4 6 8

54 56 58 60

15

8

88

For intermediate coefficients add appropriate listed values. For example, a length change

-150 -120 - 90 - 60 - 30 0

O

10 20 30 40 50 60 70 80 90 1O0

2

-360 -3 30

30 60 90 120 150 180 210 240 270 300 330

3 60 390 420 450 480 510 540 570 600 63 O 660 690 720 750 780 810 840 8 70 900

for a coefficient of

7 i s the sum of values in the 5 and 2 columns. Fractional interpolation maybe similarly calculated. *Or hundredths of micron (microns/100) per centimeter. COPYRIGHT 2003; American Society of Mechanical Engineers

Document provided by IHS Licensee=Cummins Engine/1232502100, User=, 10/17/2003 20 04:52:58 MDT Questions or comments about this message: please call the Document Policy Group at 1-800-451-1584. 标准分享网 www.bzfxw.com 免费下载

APPENDIX II

LENGTH DIFFERENCES PER CENTIMETER FROM STANDARDTEMPERATURE O TO 40

4 ature Deg

3

1 2 15 10 25 20 30 Total change in lengthfrom standard, hundredths of microns (microns/lOO)per centimeterof length.

c

O

-20 -19 -18 -17 -16

1 2

3 4 5

-30

6 7 8

-24

9 10 11 12 13 14

-20

15 16 17 18 19

-15 -14 -13 -12 -11

-26 -22

-10 9

-18

7 6

-16 -14 -12

-

8

- 8

-80

-45 -42 -39 -36 -33

-60 -56 -52 -48 -44

-30 -27 -24 -21

-40 -36 -32 -28 -24

-18

-15 -12 -9 - 6 - 3

-100 - 95

-76 -72 -68 -64

-3 O0 -285 -270 -255 -240

-400 -3 80 -360 -3 40 -3 20

-500 -475 -4 50 -425 -400

-600 -570 -540 -510 -480

-22 5 -2 10

- 60 - 55

-150 -140 -13 O -120 -1 10

-165

-3 O0 - 280 -2 60 -240 -220

-3 75 -3 50 -325 -3 O0 -275

-450 -420 -390 -360 -330

- 50

-100

-1 50 -13 5 -120 -105 - 90

-200 -180 -160 -140 -1 20

-250

-3 O0 -270 -240 -2 10

-

-1 O0 - 80

-125 -100 - 75 - 50 - 25

- 90 - 85 - 80 - 75 - 70 - 65 - 45 - 40

-

-20 -16 -12

35 30 25

- 20 - 15

-200 -190 -180 -170

-160

-

90 80

70 60 50

- 40 - 30

-195

-180

75 60 - 45 - 30 - 15

-22 5

-200 -175 -150

- 5

-

20 10

-

-

60 40 20

O

O

O

O

O

O

O

0

2

4 6

3 6 9 12

4

5

8

10

10 20 30 40

15 30 45 60

20 40 60

30

80

25 50 75 100

120

90

1O0 120 140 160 180

125 150 175 200 225

150 180 210 240 270

200 220 2 40 2 60 280

250 275 3 O0 325 3 50

3 O0 330 360 390 420

300 320 3 40 3 60 380 400

3 75 400 425 4 50 475 500

450 480 510 5 40 570 600

25

5 6 7

8

9

10 12 28 16 18

10

20

8

11 12

24

- 4

10

O

3 4

14

- 2

-

- 8

-1 50 -120 - 90 - 60 - 30

1

2

26

- 6 - 4

-180

O

22

35 36 37 38 39 40

-10

-60 -57 -54 -5 1 -48

ｗｗｗ．ｂｚｆｘｗ．ｃｏｍ - 2 - 1

23 24

30 31 32 33 34

-40 .-38 -36 -34 -32 -28

5 - 4 - 3

20 21

27 28 29

x 10

C, Coefficient of thermal expansion of material per degree

Temper-

5

CELSIUS

l14 3 l5 16 17

18

20 l9

18 l5 21 24

27

48 26 28

30 33 36 39 42

30 32 34 36 72 38 40

48 45 51 54 57 60

22

12 16

15 20

20 24

25 30 35 40 45

50 60 70

50 55 60 65 70

100

75

150 160 170 180 190 200

32 36

40 44 52 56 60 64 68 76 80

80

85 90 95

1O0

80 90

110 120 130 140

75 105 120 135 150 165 180

195 210 225

240 255 2 70 285 300

60 90

For intermediate coefficients add appropriate listed values. For example, a length change for a coefficient of 11 is the sum of the values in the 10 and 1 columns. Fractional interpolations may be similarly calculated. *Or microinches per inch. 1C = 1.8 F

21 --``,````,````,``,`````,,````,,-`-`,,`,,`,`,,`---



ANSI B4.1-1967 Preferred Limits and Fits for Cylindrical Parts

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