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1、BRITISH STANDARD BS 1083:1965 Incorporating Amendment Nos. 1 and 2 Specification for Precision hexagon bolts, screws and nuts (B.S.W. & B.S.F. threads) Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:05:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1083:1965 This British Standard, havin
2、g been approved by the Mechanical Engineering Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the authority of the General Council on 20 August 1965 BSI 02-2000 First published 1942 First revision March 1951 Second revision August
3、1965 The following BSI references relate to the work on this standard: Committee reference MEE/60 Draft for comment D64/4771 ISBN 0 580 35088 6 Co-operating organizations The Mechanical Engineering Industry Standards Committee, under whose supervision this British Standard was prepared, consists of
4、representatives from the following Government departments and scientific and industrial organizations: The Government department and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted wi
5、th the preparation of this British Standard: Associated Offices Technical CommitteeInstitution of Civil Engineers Association of Consulting EngineersInstitution of Gas Engineers Association of Mining Electrical andInstitution of Heating & Ventilating Engineers Mechanical EngineersInstitution of Mech
6、anical Engineers Board of TradeInstitution of Mechanical Engineers British Chemical Plant Manufacturers(Automobile Division) AssociationInstitution of Production Engineers* British Compressed Air SocietyLocomotive and Allied Manufacturers British Electrical and Allied ManufacturersAssociation of Gre
7、at Britain* Association*London Transport Board British Gear Manufacturers AssociationMachine Tool Trades Association* British Internal Combustion EngineMinistry of Defence. Army Department Manufacturers Association*Ministry of Defence, Navy Department* British Iron and Steel Federation*Ministry of L
8、abour (H.M. Factory Inspectorate) British Mechanical Engineering Federation*Ministry of Power British Railways Board*Ministry of Public Building and Works Crown Agents for Oversea Governments andMinistry of Technology National AdministrationsEngineering Laboratory Electricity Council, The Generating
9、 Board andMinistry of Transport the Area Boards in England and WalesNational Coal Board Engineering Equipment Users Association*National Physical Laboratory (Ministry of Gas CouncilTechnology)* High Commission of India*Radio Industry Council Institute of Marine EngineersRoyal Institute of British Ar
10、chitects Agricultural Engineers AssociationElectronic Engineering Association Association of Hydraulic EquipmentFasteners and Turned Parts Institute ManufacturersHeat Treated Bolt Association Bright Bolt & Nut ManufacturersInstitute of Iron and Steel Wire Manufacturers AssociationMinistry of Aviatio
11、n Bright Steel Bar AssociationPost Office British Constructional Steelwork AssociationRolled Thread Screw Association British Cycle & Motor Cycle IndustriesSociety of Motor Manufacturers & Association LimitedTraders, Ltd. Council of British Manufacturers of PetroleumWasher Manufacturers Association
12、Equipment Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:05:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1083:1965 BSI 02-2000i Amendment No. 1, published 11 August, 1966 to BS 1083:1965 Precision hexagon bolts, screws and nuts
13、At a fully representative conference held on 23rd November, 1965 consideration was given to the action to be taken in relation to the move to metric as far as British Standards for screw threads were concerned and it was decided that: British industry should be strongly recommended to adopt the inte
14、rnationally agreed ISO metric threads1) or ISO inch threads2) but that the ISO inch threads should be regarded as second choice. The implementation of this recommendation means that B.A., B.S.F. and B.S.W. threads should become obsolescent and should not be used in new designs. ACCORDINGLY IT HAS BE
15、EN AGREED THAT BS 1083 BE RENDERED OBSOLESCENT: IT WILL BE MADE OBSOLETE IN DUE COURSE. NOTEThe equivalent metric standard is BS 3692, “Dimensions of ISO metric precision hexagon bolts, screws and nuts”. 1) BS 3643, “ISO metric screw threads”. 2) BS 1580, “Unified screw threads”. Licensed Copy: shef
16、fieldun sheffieldun, na, Fri Nov 24 06:05:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:05:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1083:1965 BSI 02-2000iii Contents Page Co-operating organizationsInside front cover Forewordi
17、i 1Scope1 2Material1 3Finish1 4Dimensions1 5Length of bolts and screws1 6Ends of bolts and screws2 7Screw threads2 8Length of thread2 9Nuts squareness of thread to face3 10Chamfering and washer facing3 11Split-pin holes and slots3 12Marking4 13Inspection and testing4 Appendix A Mechanical properties
18、 of finished steel hexagon head bolts and screws and hexagon nuts11 Appendix B Recommended gauges13 Appendix C Standard sizes of steel hexagon head precision bolts and screws 16 Figure 1 Hexagon head bolt, washer faced5 Figure 2 Hexagon head screw, washer faced5 Figure 3 Full bearing5 Figure 4 Round
19、ed end5 Figure 5 Rolled thread end5 Figure 6 Hexagon ordinary nut, full bearing7 Figure 7 Double chamfered7 Figure 8 Washer faced7 Figure 9 Hexagon lock-nut7 Figure 10 Enlarged view of nut countersink see Subclause 10 b)7 Figure 11 Hexagon slotted nut, full bearing9 Figure 12 Double chamfered9 Figur
20、e 13 Washer faced9 Figure 14 Hexagon castle nut, full bearing9 Figure 15 Double chamfered9 Figure 16 Washer faced9 Figure 17 Eccentricity gauge13 Figure 18 Nut squareness gauge14 Figure 19 Split pin hole gauge for bolts15 Figure 20 Slot gauge for nuts15 Table 1 Hexagon head bolts and screws5 Table 2
21、 Hexagon ordinary nuts and lock-nuts7 Table 3 Hexagon slotted nuts and castle nuts9 Table 4 Mechanical properties of steel bolts and screws11 Table 5 Mechanical properties of steel nuts12 Table 6 Standard sizes of Grade A bright hexagon bolts16 Table 7 Standard sizes of Grade A bright hexagon screws
22、17 Table 8 Standard sizes of Grade R heat-treated hexagon bolts18 Table 9 Standard sizes of Grade R heat-treated hexagon screws18 Table 10 Shortest lengths designated as bolts19 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24 06:05:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1083:1965 iv
23、 BSI 02-2000 Foreword This standard makes reference to the following British Standards: BS 84, Parallel screw threads of Whitworth form. BS 131, Methods for notched bar tests Part 1: The Izod impact test on metals. BS 240, Method for Brinell hardness test. BS 860, Table of approximate comparison of
24、hardness scales. BS 919, Screw gauge limits and tolerances Part 2: Gauges for screw threads other than those of Unified form. BS 969, Plain limit gauges: Limits and tolerances. BS 1574, Split cotter pins. This British Standard has been prepared under the authority of the Mechanical Engineering Stand
25、ards Committee. Since the last revision of BS 1083 was published in 1951, an ISO Recommendation has established an ISO inch (Unified) thread and an ISO metric thread as world standards for the future. Fasteners having the ISO inch thread are already being used in many fields and it may be expected t
26、hat fasteners having the ISO metric thread will come increasingly into use. If this occurs, the extent of use of fasteners covered by BS 1083 will obviously diminish. It is recognized that any change-over period will necessarily be longer in some industries than in others and as fasteners to BS 1083
27、 are still widely used it is considered that the standard should be brought up to date as far as general requirements are concerned. The principal changes in this revision are the deletion of the 2 B.A. fasteners and of tables for short and long bolts, some alterations in the thicknesses of bolt hea
28、ds and lock-nuts to bring them into line with present-day practice and alignment of the provisions for features such as length tolerances, eccentricity of bolts and countersinking of nuts with those for Unified fasteners. No change has been made in the requirements for material. A British Standard d
29、oes not purport to include all the 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 in
30、side front cover, pages i to iv, pages 1 to 20, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fr
31、i Nov 24 06:05:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1083:1965 BSI 02-20001 1 Scope This British Standard covers precision hexagon bolts, screws and nuts having B.S.W. or B.S.F. threads in a range of nominal sizes from 1/4 in to 2 in inclusive. The dimensional requirements of this standar
32、d apply to both ferrous and non-ferrous bolts, screws and nuts. Mechanical properties are given only in respect of steel bolts, screws and nuts and the finishes in which they are normally supplied are described in Clause 3. 2 Material The steel used for the manufacture of the bolts, screws and nuts
33、shall be such that the finished products possess the mechanical properties appropriate to the particular class of bolts, screws and nuts ordered by purchaser, as designated by the grade letter and as set out in Table 4 and Table 5 of Appendix A. If the bolts and screws are produced by cold forging t
34、hey shall except in the case of precision bolts and screws bright finished to grade letter A (see Appendix A), be heat-treated after forging. Bolts, screws and nuts produced by hot-forging or turning from the bar shall be heat-treated when this is necessary to give the requisite mechanical propertie
35、s. 3 Finish a) General. The bolts, screws and nuts shall be cleanly finished, sound and free from defects. b) Types of finish. Steel precision bolts, screws and nuts are normally supplied with the following finishes: i) Heat-treated bolts and screws. The surfaces of these bolts and screws are custom
36、arily dull black from heat treatment, although the manufacturer may machine some of the surfaces of the larger bolts and screws after heat treatment. ii) Bright finished bolts and screws. This term is used to describe bolts and screws which are machined on all surfaces or which have a finish on the
37、hexagons produced by bright drawing and regarded as a machined finish. iii) Nuts. These may be bright on all surfaces or dull black when heat treated. iv) Special finishes. If steel bolts, screws or nuts are required bright all over, the purchaser should state this in his enquiry and order. If the p
38、urchaser requires bolts, screws or nuts of steel or other material to be coated, he should state the type of coating required in his enquiry and order. 4 Dimensions The bolts, screws and nuts shall conform to the dimensions and tolerances given in Table 1 to Table 3 inclusive, and Clauses 5 to 11 in
39、clusive. 5 Length of bolts and screws a) The nominal length of a bolt or screw shall be the distance from the underside of the head to the extreme end of the shank including any chamfer or radius. NOTEThe nominal lengths of bolts and screws normally stocked are given in Appendix C. Licensed Copy: sh
40、effieldun sheffieldun, na, Fri Nov 24 06:05:42 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 1083:1965 2 BSI 02-2000 b) The tolerance on the nominal length shall be as given below: 6 Ends of bolts and screws The ends of bolts and screws may, at the option of the manufacturer, be finished with either
41、 a flat chamfer with a 90 included angle to a depth slightly exceeding the depth of thread or a radius approximately equal to 11/4 times the nominal diameter of shank. When bolts and screws are made with rolled threads the lead formed at the end of the bolt or screw by the thread rolling operation m
42、ay be regarded as providing the necessary chamfer to the end, no other machining operation being necessary, and the end shall be reasonably square with the centre line of the shank. 7 Screw threads a) General. The screw threads shall be B.S.W. or B.S.F. in accordance with BS 84, “Parallel screw thre
43、ads of Whitworth form” as specified by the purchaser. b) Bolts and screws. The screw threads may be cut or rolled at the option of the manufacturer and shall conform to the limits and tolerances for medium class specified in BS 84. c) Nuts. The screw threads shall conform to the limits and tolerance
44、s for normal class specified in BS 84. d) Gauging of screw threads. Screw threads shall be gauged in accordance with the system recommended in BS 919, “Screw gauge limits and tolerances”, Part 2, “Gauges for screw threads other than those of Unified form”. 8 Length of thread a) Bolts. The length of
45、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. The minimum thread length shall be twice the diameter. Bolts that are too short for minimum thr
46、ead length shall be threaded as screws and shall be designated screws. NOTEThe shortest designated lengths for bolts are tabulated for guidance in Appendix C. b) Screws. Screws shall be so threaded that a screw ring gauge can be screwed by hand to within a distance from the underside of the head not
47、 exceeding two and a half times the pitch for diameters up to and including 1 in, and three and a half times the pitch for diameters over 1 in. c) Tolerances. i) Tolerance on bolt thread length. The tolerance on thread length shall be plus 3/16 in or 21/2 threads, whichever is the greater, for all l
48、engths. ii) Tolerance on eccentricity. Tolerance on eccentricity (including out of parallelism) of thread in relation to body for sizes up to and including 3/4 in shall be 0.010 in for each inch of length when measured in a sleeve gauge. For sizes over 3/4 in, total eccentricity shall be the subject
49、 of agreement between manufacturer and purchaser. NOTEDetails of the sleeve gauge referred to above are given in Appendix B. Nominal lengthDiameterTolerance on length in Up to and including 1 Over 1 up to and including 2 Over 2 up to and including 6 Over 6 in Up to and including 3/4 Over 3/4 Up to and including 3/4 Over 3/4 Up to and including 3/4 Over 3/4 All diameters in + 0 1/32 + 0 1/16 + 0 1/16 + 0 1/8 + 0 3/32 + 0 3/16 + 0 3/16 Licensed Copy: sheffieldun sheffieldun, na, Fri Nov 24