BS 3692.pdf

S T D - B S I BS 3692-ENGL 2003

3624669 0897249 433 111

BS 3692:2001

BRITISH STANDARD

IS0 metric precision hexagon bolts, screws and nuts Specification -||| |||| |||||||| ||| |||| ||||| | | | || | |---

I C s 21.060.10;21.060.20

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S T D - B S I BS 3b9Z-ENGL Z O O L

BS 3692:2001

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Lb24bb9 0897250 L55

Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee, FME/S, Bolts, nuts and accessories (+ &A and hose clamps), upon which the following bodies were represented: British Constructional Steelwork Association Ltd Confederation of British Forgers Electricity Association Society of Motor Manufacturers and Traders Limited

UK Steel Association

This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Committee and comes into effect on 15 February 2001 --

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Amendments issued since publication Amd. No

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First published December 1963 Second edition August 1967 Third edition February 2001

IDate

I Comments

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The following BSI references relate to the work on this British Standard: Committee reference FME/9 Draft for comment 00/711040DC | | || | |---

ISBN O 580 33262 4

COPYRIGHT 2002; British Standards Institution on ERC Specs and Standards


STD-BSI B S 3672-ENGL 2001 m lb24bb7 0877253 O91 m

BS 3692:2001

Contents Committees responsible Foreword

Page Inside front cover

Scope Normative references Finishes General dimensions Length of bolts and screws Ends of bolts and screws Screw threads Length of thread on bolts and screws Angularity and eccentricity of bolts, screws and nuts Chamfering, washer facing and countersinking Strength grade designation system for steel bolts and screws Material and manufacture of steel bolts and screws Mechanical properties of steel bolts and screws Strength grade designation system for steel nuts Material and manufacture of steel nuts Mechanical properties of steel nuts (excluding thin nuts) Drilled bolts with split pin holes Marking and identification (see also Annex E) Inspection and testing Complete designation for the purpose of an enquiry or order

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2 3 4 5 6 7 8 9 10 11

12 13 14 15 16 17 18 19 20

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1 1

2 2 2 2 2 3 3 4 4 4 5 5 6 6 6 6 6 7

Annex A (normative) Recommended gauge for checking squareness of 18 thread to face of nut (see clause 9) Annex B (normative) Chemical composition of steel nuts (see 15.2) 18 Annex C (normative) Testing of mechanical properties of steel nuts (see clauses 16 and 19) 19 Annex D (informative) Association of bolt and screw lengths and diameters (see clause 8) 21 Annex E (informative) Basis for the derivation of tolerances 24 Annex F (informative) Manufacturers’ recommended range of sizes 30 Bibliography 32 Figure 1- Depth of decarburization on steel bolts and screws Figure 2 - Hexagon head bolt Figure 3 - Hexagon head screw Figure 4 - Full bearing head washer face Figure 5 - Rounded end Figure 6 - Rolled thread end Figure 7 - Normal thickness nut Figure 8 -Thin nut Figure 9 - Enlarged view of nut countersink Figure 10 - Slotted nut. Sizes M4 to M39 only (Six slots) Figure 11- Castle nut. Sizes M12 to M39 only (Six slots) Figure 12 - Castle nut. Sizes M42 to M68 only (Eight slots) Figure A.l- Nut squareness gauge Figure C.1- Proof load test for nut Figure C.2 - Examples of marking of forged nuts

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Figure C.3 - Examples of marking of bar turned nut Figure E.l- Widths across flats Figure E.2 -Widths across corners Figure E.3 - Heights of heads Figure E.4 - Shank diameter of full size bolts Figure E.5 - Nominal length Figure E.6 - Thread lengths Figure E.7 - Eccentricity of the head Figure E.8 -Angularity of the hand Figure E.9 - Eccentricity between shank and thread Figure E.10 - Eccentricity of split pin hole Figure E. 11-Widths across flats Figure E.12 -Widths across flats Figure E.13 - Thicknesses of nuts Figure E.14 - Dimensions of slots Figure E.15 - Eccentricity of the hexagon Figure E.16 - Eccentricity of the slots Figure E.17 -Angularity of the nuts

3 Table 1- Basis for standard thread lengths Table 2 - Strength grade designations of steel bolts and screws 4 5 Table 3 - Strength grade designations of steel nuts 6 Table 4 - Recommended bolt and nut combinations Table 5 - IS0 metric precision hexagon bolts and screws 9 Table 6 - IS0 metric precision hexagon nuts and thin nuts 13 Table 7 - IS0 metric precision hexagon slotted nuts and castle nuts 15 Table 8 - Tolerances on the standard nominal lengths of bolts and screws 16 16 Table 9 - Mechanical properties of steel nuts 17 Table 10 - Proof loads for steel nuts (coarse pitch series) 18 Table B. 1- Chemical composition of steel nuts Table C.l- Strength grade designation marking of nuts 20 Table D. 1- Preferred standard sizes of IS0 metric precision hexagon bolts and screws 21 Table D.2 - Standard thread lengths and the shortest lengths designated as bolts, related to diameter 23 30 Table F.l- Hexagon head bolts 31 Table F.2 - Hexagon head screws

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STD*BSI BS 3b92-ENGL 2001

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BS3692:2001

Foreword

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This new edition of the British Standard has been prepared by Sub-committee FME/9/6, General purpose fasteners and accessories, on behalf of Technical Committee FME/9, Bolts, nuts and accessories. It supersedes BS 3692:1967, which is withdrawn. This new edition embodies the text of amendment No. 1 (AMD 1720) and amendment No. 2 (AMD 8227). The need for bolts, screws and nuts covered by this British Standard has been reviewed and it has been decided, in the interests of safety, to delete BS 3692:1967 Tables 10 and 13 (mechanical properties for bolts and screws) and to produce a new edition. In this edition, BS EN IS0 898-1 has been referred to as it reflects current thinking and practice of the mechanical properties for such products. This edition cross-refers to tables for mechanical properties of bolts, and brings the specification into line with BS EN IS0 898-1. Annex A and Annex B are normative. Annex C, Annex D, Annex E, and Annex F, are informative. It has been assumed in the drafting of this British Standard that the execution of its provisions is entrusted t o appropriately qualified and experienced people, for whose guidance it has been prepared. A British Standard does not purport to include all necessary provisions of a contract. Users of British standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1to 32, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.

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BS 3692:2001

1 Scope This British Standard gives the general dimensions and tolerances of precision hexagon bolts, screws and nuts with IS0 metric threads in diameters from 1.6 mm to 68 mm inclusive. Mechanical properties are given only in respect of carbon or alloy steel bolts, screws and nuts, which are not to be used for special applications, such as those requiring weldability, corrosion resistance or ability to withstand temperatures above 300 OC or below 50 O C . NOTE Nuts with an effective height of less than 0.6d and/or with a width across flats or outside diameter of less than 1.45d are excluded from the mechanical requirements specified.

The dimensional requirements of this standard also apply to non-ferrous and stainless steel bolts, screws and nuts. NOTE It is considered that the range of nominal sizes included in this standard is adequate for most of the applications for which this series is likely to be employed, but for the convenience of users requiring larger sizes, further information in relation to the derivation of tolerances is provided in Annex E.

2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this British Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. For undated references, the latest edition of the publication referred t o applies. BS 1916-1:1953, Limits and fits for engineering - Part 1: Limits and tolerances. BS 1916-2:1953,Limits and fits for engineering - Part 2: Guide to the selection of fits in BS 1916-1. BS 1916-3:1963,Limits and fits for engineering - Part 3: Recommendations for tolerances, limits and fits for large diameters. BS 3580:1964,Guide to design considerations on the strength of screw threads. BS 3643-1:1981, I S 0 metric screw threads -Part 1: Thread data and standard thread series. BS 3643-2:1981,IS0 metric screw threads -Part 2: Limits and tolerances for coarse pitch series threads. BS EN 10045-1:1990,Charpy impact test on metallic materials -Part 1: Test method (V- and U-notches). BS EN 10109-1:1996,Metallic materials - Hardness test - Part 1: Rockwell test (scales A, B, C, O,E, F, G, H, K) and Rockwell superficial test (scales 15 N, 30 N, 45 N, 15 T, 30 T a n d 45 T). BS EN 10109-2:1996, Metallic materials - Hardness test -Part 2: Verification of Rockwell hardness testing machines (scales A, B, C, O,E, F, G, H, K, N, T). BS EN 10109-3:1996, Metallic materials - Hardness test -Part 3: Calibration of standardized blocks to be used for Rockwell hardness testing machines (scales A, B, C, O,E, F, G, H, K, N, T). BS EN 20286-1:1993, I S 0 system of limits and fits -Part 1: Specification for uses of tolerances, deviations and fits. BS EN 20286-2:1993, I S 0 system of limits and fits -Part 2: Tables of standard tolerancegrades and limit deviations for holes and shafts. BS EN 20898-2:1994, Mechanical properties of fasteners - Nuts with specified proof load values Coarse thread. Mechanical properties of fasteners made of carbon steel and alloy steel BS EN IS0 898-1:1999, Part 1: Bolts, screws and studs. BS EN IS0 1234,Split pins. BS EN IS0 4042:2000,Fasteners - Electroplated coatings. BS EN IS0 4759-1,Tolerances for fasteners -Part 1: Bolts, screws, studs and nuts -Product grades A, B and C. BS EN IS0 6506-1:1999,Metallic materials -Brinell hardness test -Part 1: Test method. BS EN IS0 6506-2:1999, Metallic materials -Brinell hardness test - Part 2: Verification of Brinell hardness testing machines. BS EN IS0 6506-3:1995, Metallic material - Brinell hardness test - Part 3: Calibration of reference blocks. --

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BS EN IS0 6507-1:1998, Metallic materials - Viehers hardness test - Part 1: Test method. BS EN IS0 6507-2:1998, Metallic materials - Vickers hardness test - Part 2: Verification of testing machines. BS EN IS0 6507-3:1998, Metallic materials - Vickers hardness test -Part 3: Calibration of reference blocks.

3 Finishes Steel precision bolts, screws and nuts are supplied with the following finishes: -Heat-treated bolts and screws. Components heat-treated after manufacture are customarily dull black, although the manufacturer may machine some of the surfaces of the larger size bolts and screws after heat treatment. -Bright finished bolts and screws. This term is used to describe bolts and screws which are finished bright on all surfaces or which have a finish on the hexagon, produced by bright drawing. - Nuts. These may be bright on all surfaces or dull black when heat-treated. - Other finishes. If the purchaser requires bolts, screws or nuts of steel (or other material) to be coated, they should state the type of coating required in their enquiry and order and it is recommended that reference be made to BS EN IS0 4042, in this respect. If steel bolts, screws or nuts are required finished bright all over, the purchaser should state this in their enquiry and order.

4 General dimensions The bolts, screws and nuts shall conform to the general dimensions given in Table 1, Table 5, Table 6, Table 7 and Table 8, and in clauses 5 to 10 inclusive.

5 Length of bolts and screws 5.1 Nominal length The nominal length of a bolt or screw is the distance from the underside of the head to the extreme end of the shank including any chamfer or radius. The standard nominal lengths shall be as given in Table 8. NOTE Preferred nominal lengths of bolts and screws, in association with diameters, are given in Annex D.

5.2 Tolerance on length The tolerance on the nominal length shall be as given in Table 8.

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The ends of bolts and screws may, at the option of the manufacturer, be finished with either a 45"chamfer to a depth slightly exceeding the depths of thread or a radius approximately equal t o one and a quarter times the nominal diameter of the shank. When bolts and screws are made with rolled threads, the lead formed at the end of the bolt by the rolling operation may be regarded as providing the necessary chamfer to the end with no other machining operation being necessary, and the end shall be reasonably square with the centre line of the shank. (See Figure 5 and Figure 6.)

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7 Screw threads

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7.2 Tolerances The screw threads shall be made to the tolerances for the medium class of fit (6H/6g) as specified in BS 3643-2, unless a purchaser requires other classes of fit or fine pitch threads when this shall be the subject of agreement between the purchaser and the manufacturer.

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The form of thread and diameters and associated pitches of standard IS0 metric bolts, screws and nuts shall be in accordance with BS 3643-1.

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7.1 General


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6 Ends of bolts and screws

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8 Length of thread on bolts and screws 8.1 Bolts 8.1.1 The length of thread on bolts shall be the distance from the end of the bolt (including any chamfer or radius) to the leading face of a screw ring gauge, which has been screwed as far as possible on to the bolt by hand. 8.1.2 The standard thread lengths, as given in Table D.2, are based on the formulae given in Table 1. Table 1 - Basis for standard thread lengths Nominal length of bolt 1

Up to and including 125 mm Over 125 mm up to and including 200 mm Over 200 mm

Length of thread

b

2d+6mm 2d + 12 mm 2d + 25 mm

8.1.3 The length of thread runout shall not exceed the values given in column 3 of Table 5. 8.1.4 Bolts that are too short for minimum thread lengths shall be threaded as screws and shall be designated screws. Guidance in this respect is given in Annex D. 8.2 Tolerances 8.2.1 The tolerances on bolt thread lengths shall be plus two pitches for all diameters, as given in Table D.2. 8.2.2 The eccentricity of the thread relative to the shank of bolts shall not exceed the values given in column 19 of Table 5. 8.3 Screws

Screws shall be threaded to permit a screw ring gauge being screwed by hand to within a distance from the underside of the head not exceeding two and a half times the pitch for diameters up t o and including 52 mm and three and a half times the pitch for diameters over 52 mm, in accordance with column 3 of Table 5.

9 Angularity and eccentricity of bolts, screws and nuts

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9.1 The axis of the thread of the nut shall be square to the face of the nut subject to the “squareness tolerance” given in column 9 of Table 6, which is equivalent to an out of squareness of A l o . The nut shall be screwed by hand on to a gauge having a truncated taper thread until the thread of the nut is tight on the thread of the gauge. A sleeve sliding on a parallel extension of the gauge, and which has a face of diameter equal to the minimum distance across flats of the nut and at exactly 90”to the axis of the gauge, shall be brought into contact with the leading face of the nut. The sleeve shall be in such a position so that it shall not be possible for a feeler gauge of thickness equal to the squareness tolerance to enter anywhere between the leading face of the nut and the face of the sleeve (see Annex A).

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9.2 The hexagon flats of bolts, screws and nuts shall be square to the bearing face, and the angularity of the head shall be within the limits of 90”f 1”(see Annex E).

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9.3 The eccentricity of the hexagon flats of nuts relative to the thread diameter shall not exceed the values given in column 10 of Table 6.

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9.4 The eccentricity of the head relative to the width across flats and eccentricity between the shank and thread of bolts and screws shall not exceed the values given in columns 18 and 19, respectively, of Table 5.

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O BSI 02-2001 COPYRIGHT 2002; British Standards Institution on ERC Specs and Standards


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BS 3692:2001

Strength grade designation 4.6 4.8 5.6 5.8 6.8 8.8 10.9 Tensile strength R, min. N/mm2 400 400 500 500 600 800 1000 240 320 300 400 480 Yield stress Re min. Nimm2 Stress at permanent set limit Romz N/mm2 - - - - 640 900

12.9 1200

1080

12 Material and manufacture of steel bolts and screws 12.1 Method of production

Steel bolts and screws may be produced by cold forging, hot forging or by turning from bar. The choice of method shall be left to the manufacturer. 12.2 Chemical composition

The chemical compositions of steels, given in Table 2 of BS EN IS0 898-1, are for guidance only. The choice of steels shall be at the discretion of the manufacturer. The steel used shall be such that the finished product possesses the mechanical properties appropriate to the strength grade quoted. 12.3 Heat treatment 12.3.1 Grades designated 8.8, 10.9 and 12.9 shall be heat-treated to give the mechanical properties given in BS EN IS0 898-1. 12.3.2 Other grades may be heat-treated if this is necessary to obtain the mechanical properties given

in BS EN IS0 898-1.


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BS 3692:2001

12.4 Decarburization 12.4.1 Decarburization of the thread surface shall not be greater than stipulated below for bolts and screws of grade designations 8.8, 10.9, and 12.9. 12.4.2 The depth of the non-decarburized zone shall be not less than two thirds of the depth of the basic thread. In the root of the thread, the decarburization shall not exceed one tenth of the depth of the basic thread. 12.4.3 The method of measuring the amount of decarburization shall be as specified in BS EN IS0 898-1.

Depth of basic thread

2 / 3 H , min

1/10H, max

IIIIIIIIIIIIIIIIIIIIIII

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Completely and partially decarburized zone

m

Non - decarburized zone

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Figure 1 - Depth of decarburization on steel bolts and screws

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Strength grade designation Proof load stress N/mm2

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4 400

5 500

6 600

8 800

10 1000

12 1200


STDOBSI BS 3692-ENGL 2001 W 1624669 0897257 382 BS 3692:2001

Grade of bolt Recommended grade of nut

4.6 4

4.8 4

5.6 5

5.8 5

6.8 6

8.8 8

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10.9 10

12.9 12

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NOTE Nuts of a higher strength grade may be substituted for nuts of a lower strength grade.

15 Material and manufacture of steel nuts 15.1 Method of production Steel nuts may be produced by cold forging, hot forging or by turning from bar. The choice of method shall be left to the manufacturer.

15.2 Chemical composition The chemical compositions of the steels from which nuts are made shall conform to those given in Annex B. NOTE The use of free-cutting steels at temperatures above 250 "C is not recommended. Free-cutting steel may be used where permitted in Annex B, or otherwise by special agreement between the purchaser and the supplier.

15.3 Heat treatment Nuts shall be heat-treated where this is necessary to obtain the mechanical properties given in clause 14.

16 Mechanical properties of steel nuts (excluding thin nuts) Steel nuts (excluding thin nuts) shall meet the requirements for mechanical properties given in Table 9. The nuts shall withstand the proof load stress given in Table 9 when tested in accordance with Annex C. Nuts that are proof load tested shall have a hardness not in excess of the maximum given in Table 9. Nuts which are not proof load tested shall have a hardness not less than the minimum agreed between the purchaser and the supplier and not more than the maximum given in Table 9. The tests shall be in accordance with Annex C.

17 Drilled bolts with split pin holes 17.1 Bolts with split pin holes will be supplied only when specially ordered. The purchaser should state, in his enquiry and order, dimension E,,' as illustrated in Figure 2. A tolerance of -0 + 0.8 mm shall be permissible on the specified dimension Zp. 17.2 The split pin holes shall be drilled through the centre of the bolt as specified in BS EN IS0 1234. --

18 Marking and identification (see also Annex E) ||| |||| |||||||| ||| ||||

18.1 General The marking and identification requirements of this standard are only mandatory for steel bolts, screws and nuts of 6 mm diameter and larger; manufactured to strength grade designations 8.8 (for bolts or screws) and 8 (for nuts) or higher. ||||| |

18.2 Bolts and screws Marking of bolts and screws shall be as specified in clause 9 of BS EN 20898-21994. | | || | |---

19 Inspection and testing 19.1 The manufacturer shall take the necessary steps to ensure that the requirements of this standard are fulfilled but if, in addition the purchaser desires the manufacturer to certify or demonstrate that the bolts, screws and nuts conform to this standard, the details and cost of any further inspection shall be the subject of agreement between the purchaser and the manufacturer. 19.2 Tests for mechanical properties shall be in accordance with Annex C and BS EN IS0 898-1.



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20 Complete designation for the purpose of an enquiry or order 20.1 Information to be given When designating IS0 metric precision bolts, screws and nuts for the purpose of an enquiry or order, the following information shall be given. a) General product description, i.e. “bolts”,“screws”, “nuts”, “slotted nuts”, etc., and material (if other than steel). b) The letter “M“ indicating that the product is IS0 metric. c) The nominal size (thread diameter) if a fine pitch is also t o be included in the designation, e.g. M10 X 1.25. d) The nominal length in millimetres. This applies only to bolts and screws. e) The number of this British Standard, i.e. BS 3692. i) The strength grade symbol - this applies to steel products only. g) The plating (if required), in accordance with appropriate part of BS EN IS0 4042. 20.2 Examples a) Bolts 10 mm diameter, 50 mm long, manufactured from steel of strength grade 8.8, would be designated: a) “Bolts M10 x 50,8.8to BS 3692”. b) Brass screws 8 mm in diameter, 20 mm long, would be designated: “Brass screws M 8 X 20 to BS 3692”. c) Nuts 12 mm in diameter, manufactured from steel of strength grade 6,cadmium plated, would be designated: “Nuts M12,6 to BS 3692,plated to BS EN IS0 4042”. 20.3 Special requirements Special requirements, not covered by this standard, relating to classes of fit, fine pitch threads, etc., shall be specifically set out and agreed between the purchaser and the manufacturer.

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Figure 2 - Hexagon head bolt

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Figure 3 - Hexagon head screw

I

Figure 4 - Full bearing head washer face

1.25úapprox.

Figure 5 - Rounded end

Figure 6 - Rolled thread end



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Figure 7 - Normal thickness nut

t Figure 8 - Thin nut

BSI 02-2001

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Countersink da see clause 10.2.2

Figure 9 - Enlarged view of nut countersink

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Figure 10 - Slotted nut. Sizes M4 to M39 only (Six s l o - ~ )

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Figure 11 - Castle nut. Sizes M12 to M39 only (Six slots)

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Figure 12 - Castle nut. Sizes M42 to M68 only (Eight slots)



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Table 8 - Tolerances on the standard nominal lengths of bolts and screws Dimensions in millimetres Nominal length 1

5 6 (7) 8

(9)

L Tolerance

h0.24

Nominal leng&h 1

Tolerance

k0.70 *0.70 h0.70 *O. 70 ho. 70 h0.70 h0.70 h0.80

90 (95) 100 (105) 110 (115) 120 (125) 130 140 150 160 170 180 190 200 220

*0.24 h0.29 'h0.29 h0.29 h0.29 *0.35 *0.35 M.35 h0.35 h0.35 *0.42 *0.42 h0.42 h0.42 h0.42 h0.50 h0.50 *0.50 h0.50 *0.50 h0.50

h0.80

*o. 80 à4.80 k0.80 h0.80 h0.80

h0.925 h0.925 k0.925 h0.925 h1.05 h1.05 h1.05 h1.15 h1.15 k1.15 h1.15 h1.25 11.25 *1.25 k1.25

240

260 280 300 325 350 375 400 425 950 475

h0.60 M.60

*O.60 70 75 80 85

h0.60

NOTE 1 Lengths shown in NOTE 2 See also Annex F.

:kets are non-preferred.

*O.60 h0.60 *0.70

500

Table 9 - Mechanical properties ofsteel nuts Strength grade designation

4

5

6

8

10

N/mm2 Proof load stressa 400 302 Brinell hardness (HB) max. Rockwell hardnessb (HRC)max. 30 310 Vickers hardness (HV)max.

500

600 302 30 310

800 302 30 310

1 O00 353 36 370


302 30 310

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12 1200 375 Allnuts 39 Allnuts 395 Allnuts

oBSI 02-2001


STDOBSI BS 3b92-ENGL 2001

BS 3692:2001

Lb24669 0897270 T 4 3 9

Table 10 - Proof loads for steel nuts (coarse pitch series) Nominal size of nut

Tensile stress area of bolt

Strength grade designation 4

5

8

6

10

12

1 O00

1 200

Stress under proof load N/mm*

400

600

I

600

800

Proof load mm

M1.6 M2 M2.5 M3 M4

M5 M6 M8 M10 M12 M14 M16 M18 M20 M22 M24 M27 M30 M33 M36 M39 M42 M45 M48 M52 M56 M60 M64 M68

mm*

1.27 2.07 3.39 5.03 8.78 14.2 20.1 36.6 58.0 84.3 115 157 192 245 303 353 459 561 694 817 976 1120 1300 1470 1 760 2 030 2 360 2 680 3 060

N

510 830 1360 2 O10 3 510 5 680 8 040 14 600 23 200 33 700 46 O00 62 800 76 800 98000 121000 141 O00 184 O00 224000 278 O00 327 O00 390 O00 448000 520000 588000 . 704000 812000 944000 1072000 1224000

640 1030 1 700 2 520 4 400 7 100 10 O00 18 300 29 O00 42 100 57 500 78 500 98000 122000 151000 175 O00 230 O00 280000 347 O00 408 O00 488 O00 560000 650000 735000 880000 1015000 1180000 1340000 1530000

760 1240 2 030 3 020 5 250 8 500 12 O00 22 O00 35 O00 50 500 69 O00 94 O00 115000 147000 182000 212 O00 276 O00 336000 416 O00 490 O00 585 O00 672000 780000 882000 1060000 1220000 1420000 1610000 1840000

1020 1650 2 710 4 O00 7 O00 11 400 16 O00 29 O00 46 O00 67 O00 92000 125 O00 154 O00 196 O00 242000 282 O00 367 O00 448000 555 O00 653 O00 780000 896000 1040000 1180000 1410000 1620000 1890000 2140000 2450000

1270 2 070 3 390 5 O00 8 750 14 200 20 O00 36 500 58 O00 84000 116000 157 O00 192 O00 245 O00 303000 353 O00 459 O00 561000 694 O00 817 O00 976000 1120000 1300000 1470000 1760000 2030000 2 360000 2680000 3060000

1 520 2 480 4 070 6 O00 10 500 17 O00 24 O00 43 O00 69 500 100000 138000 188 O00 230 O00 294 O00 364000 423 O00 550 O00 673000 833 O00 980 O00 1170000 1340000 1560000 1760000 2110000 2440000 2 830000 3220000 3670000

NOTE 1 Proof load = Stress under proof x tensile stress area of bolt NOTE 2 For stress under proof load, see Table 9. NOTE 3 Nuts with a specified proof load above 500 O00 N force may be exempted from proof load testing, see clause 14 and Table 9.

--

BSI 02-2001

COPYRIGHT 2002; British Standards Q Institution on ERC Specs and Standards

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17


BS 3692:2001

-

3624bb9 0897273 98T

Annex A (normative) Recommended gauge for checking squareness of thread to face of nut (see clause 9) Figure A.l shows the recommended gauge for checking the squareness of the thread to the face of the nut.

Dia. of gauging surface equal to the minimum across distance flats o f nut

Small end of thread = nom. effect dia. of nut minus 0.02 rnrn approx. on 3 rnm dia. up to 0.1 2 mm approx on 39 mm dia.

/------

\

/ Thread tapered at an included angle of approx. 0.5"

Large end o f thread = course fit max. effect dia. of nut plus 0.035 mm approx. on 3 rnm dia. up to 0.12 mm approx. on 39 mm dia.

gauged Feeler gauge equal A L t o squareness toîerance(rnax.)

Figure A.l- Nut squareness gauge

Annex B (normative) Chemical composition of steel nuts (see 15.2) The chemical composition of materials from which steel nuts shall be made are given in Table B.l. Table B.1- Chemical composition of steel nuts Chemical composition limits (check analysis)

Phosphorus max.

Sulfur max.

%

%

%

%

0.30 0.45

0.110 0.060 0.048

0.150 0.150 0.058

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NOTE 1 Free cutting steel may be used only by special agreement between the purchaser and the supplier. In such cases, the following maximum phosphorus, sulfur and lead contents are permissible: Phosphorus, 0.12 %; Sulfur,0.34 %; Lead, 0.35 %. NOTE 2 Alloying elements may be added if necessary to develop the mechanical properties of the nuts stipulated in clause 16.

|| |

0.50 0.58 0.58

Manganese min.

| |

4,5 and 6 (See notes) 8 10 and 12 (See notes)

Carbon max.

|

Strength grade designation



STDoBSI BS 3b92-ENGL 2001

Lb24bb9 0897272 8 L b

BS 3692:2001

Annex C (normative) Testing of mechanical properties of steel nuts (see clauses 16 and 19) C.1 Proof load test C.l.l The proof load test consists of applying the relevant proof load given in Table 10 which was obtained from the proof load stress given in Table 9.

C.1.2 Assemble the nut to be tested on a hardened and tempered mandrel as shown in Figure C.1 and apply the specified load in an axial direction.

Hardened and tempered test plate

O = d with limits to Class O1 1 (BS 1916)

\ Hardened and tempered mandrel

I

t

Load -||| |||| |||||||| |||

Figure C.1- Proof load test for nut

||||

C.1.3 The nut shall withstand this load without failure by stripping or rupture, and should be removable by the fingers after the load is released. If the threads of the mandrel are damaged during the test, the test shall be discarded.

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C.1.4 It may be necessary to use a manual wrench to start the nut in motion. Such wrenching is permissible providing it is restricted to a half turn and the nut is then removable by the fingers after this initial loosening.

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C.2 Hardened mandrel

|---

The mandrel shall have a hardness of not less than Rockwell C45. The thread shall be tolerance class 5h except that the tolerance on the major diameter shall be the last quarter of the 6g range on the minimum material side.

Q BSI 02-2001



19

BS 3692:2001


Lb24bb9 0897273 752 9

C.3 Hardened test plate

The test plate shall have a hardness of not less than Rockwell C38. C.4 Hardness test on nuts

Brinell, Rockwell and Vickers hardness may be determined. Apply the impression to the top and bottom face of the nut, otherwise on the side of the nut. C.4.1 Perform a Brinell hardness test in accordance with the requirements of BS EN IS0 6506-1 t o -3. C.4.2 Perform a Rockwell hardness test in accordance with the requirements of BS EN 10109-1. C.4.3 Perform a Vickers hardness test in accordance with the requirement of BS EN IS0 6507-1 to -3.

Table C.l-

Strength grade designation marking of nuts

marking system”

I

Figure (3.2 - Examples of marking of forged nuts

@ yx --

Y

X

NOTE Although it is permissible for the metric symbol “M“ t o be indented singularly,or rolled contiguously(as shown in view ‘Y),the marking of the strength grade symbol should never be contiguous (e,g view “Y‘) and a gap t 0.5 mm should be maintainedbetween figures.

Figure C.3 - Examples of marking of bar turned nut


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O BSI 02-2001


STD*BSI BS 3672-ENGL 2001 W 1624669 087727q 699

BS 3692:2001

.Li

a

9m

*,

CI

O

a

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8 BSI 02-2001



21

STD-BSI BS 3692-ENGL 2 O O L

Lb24bbî 0897275 525

BS 3692:2001

% 3

.v

o

o

2 a

B

Q)

&

51 a E (d

m

Y

&

O

P

o

M (d

b4

3 a

O

.rl

a

o:

.rl

a

Ø

o

.rl

&

Y

i

O

3 cw O

m

N

.rl

m

2

(d

a

o)

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Cp1

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9 m 2 42




=

L b 2 4 6 6 7 0 8 7 7 2 7 b Lib1

BS 3692:2001

D.2 Table D.2 gives standard thread lengths and the shortest lengths designated

as bolts, related to diameter. Table D.2- Standard thread lengths and the shortest lengths designated as bolts, related to diameter Dimensions in millimetres Nominal size and bolt diameter

I

Up to 125 mm d

M1.6 M2 M2.5 M3 M4 M5 M6 M8 M10 M12 0414) M16 W18) M20 W22) M24 0427) M30 0433) M36 0439) M42 0445) M48 0452) M56 0460) M64

,WW

9 10 11 12 14 16 18 22 26 30 34 38 42 46 50 54 60 66 72 78 84 90 96 102 -

-


I

-

+O. 7 +0.8 +0.9 +LO +1.4 +1.6 +2.0 +2.5 +3.0 +3.5 +4.0 +4.0 +5.0 +5.0 +5.0 +6.0 +6.0 +7.0 +7.0 +B.O +B.O +9.0 +9.0 +10.0 +10.0 +11.0 +11.0 +12.0 +12.0

-

-

-

-

-

-

-

32 36 40 44 48 52 56 60 66 72 78 84 90 96 102 108 116 124 132 140 148

-

-

Shortest length designated as a bolt

I

b

-

-

thread length

Above 200 mm

Over 125 mm and up to 200 mm

57 61 65 69 73 79 85 91 97 103 109 115 121 129 137 145

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8 BSI 02-2001

I Tolerance on bolt I

Length of thread b for nominal bolt length I

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(38) 45 45 50 55 60 65 70 80 85 90 100 (105) 110 120 (125) 140 150 160 170

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BS 3692:2001

STD-BSI BS 3692-ENGL 2 0 0 1

Lb24bb9 0897277 3 T B

Annex E (informative) Basis for the derivation of tolerances E.l Hexagon bolts and screws The following figures (Figure E.l to Figure E.10 inclusive) illustrate the basis for the derivation of tolerances for hexagon bolts and screws.

-

-

Tolerance field for the width across flats s

S

mm

h 12 h 13 h 14 Figure E.1 -Widths across flats

s8mm >8 5 32 m m >32 mm

e-,

= 1.13 x s,,,h. for ali products according to BS EN IS0 4759-1.

Figure E.2 -Widths across corners

k . i c ) ,

The tolerance field for the height of head (It) js 14.

Figure E.3 - Heights of heads

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O BSI 02-2001


S T D - E S 1 BS 3b92-ENGL 2001

L b 2 4 b b 9 0897278 2 3 4 W

BS 3692:2001

The tolerance field for the shank diameter (d)h13.

|| |

|---

Figure E.4 - Shank diameter of full size bolts

| |

The tolerance field for the nominal length (1) f U ITlS.

--

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Figure E.5 - Nominal length

The tolerance on dimensions b i 2 p , wherep is the pitch of the thread.

Figure E.6 - Thread lengths

The tolerances field for eccentricityof the head IT13. The reference dimensionfor the eccentricityis the width across flats.

Figure E.7 - Eccentricity of the head

8 BSI 02-2001



BS 3692:2001

STD.BS1 BS 3bï2-ENGL 2 O O L

Angle a 90 i 1'; angle p 90'

L b 2 4 6 6 9 0897279 170

* 1".

Figure E.8 -Angularity of the hand

-||| |||| |||||||| |||

I

The tolerance field for eccentricity between shank and thread IT13. The reference dimension for the eccentricity is the thread diameter.

Figure E.9 - Eccentricity between shank and thread

|||| ||||| | | | || | |---

U

The tolerance field for eccentricity of split pin hole IT13. The reference dimension for the eccentricity is the thread diameter.

Figure E.10 -Eccentricity of split pin hole


Document provided by IHS Licensee=Qatar Petroleum/5943408103, User=, 12/21/2002 00:14:25 MST Questions or comments about this message: please call the Document Policy Management Group at 1-800-451-1584. ~

-~~

S T D - B S I B S 3b72-ENGL 2001 m 1 b 2 4 b b 9 0897280 972

=

BS 3692:2001

E.2 Hexagon nuts The following figures (Figure E.ll to Figure E.17inclusive) illustrate the basis for the derivation of tolerances for hexagon nuts.

Tolerance field for the width across flats 8

8

h12 h13 h14

58 m m >8 5 32 m m >32 m m

emb,= 1.13 x smb.for all products (according to BS EN IS0 4769-1).

Figure E.12 -Widths across flats

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27



BS 3692:ZOOl

STD.BSI BS 3692-ENGL 2001

1 6 2 4 b b 9 0897281 829 D

I

Width of slot n

Dimension

'olerance field

H 14

Depth of slot m

h 14

Diameter dz

h 14

The tolerance field for eccentricity of the hexagon IT13. NOTE The reference dimension for the eccentricity is the thread diameter.

Figure E.15 - Eccentricity of the hexagon

|---

1

|| |

The eccentricity of the slots IT13.

| |

The reference dimension for the eccentricity is the thread diameter.

--

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Figure E.16 - Eccentricity of the slots



-

~

~

~

STD-BSI BS 3692-ENGL 2001 W Lb24bb9 0897282 7b5 9

BS 3692:2001

*

Angle a 90" 1";angle 90" 1" NOTE The reference dimension for the eccentricityis the thread diameter.

Figure E.17 -Angularity of the nuts

--

8 BSI 02-2001


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29

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STDSBSI BS 3belZ-ENGL 2001 W 16211669 0897283 b T 1

BS 3692:2001

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H Lb24559 0897284 538 I

BS 3692:2001

o

i

o m 0 mmcD

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8 BSI 02-2001


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1624669 0897285 474

BS 3692:2001

Bibliography BS 1916-1:1953,Limits and fits for engineering -Part 1: Limits and tolerances. BS 1916-2~1953, Limits and fits for engineering- Part 2: Guide to the selection of fits in BS 1916-1. BS 1916-3~1963, Limits and fits for engineering -Part 3: Recommendations for tolerances, limits and fits for large diameters.

BS EN IS0 4042:2000, Fasteners - Electroplated coatings.

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BS 3692:ZOOl

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