SPECIFICATIONFOR
ISO METRIC
SPECIFICATIONFOR ISOMETRIC PRECISIONHEXAGONBOLTS SCREWSANDNUTS
BS3692:1967
Incorporating amendment issuedApril 1975(AMD 1720).
BS 3692 :1967
THIs BRrTISH STANDARD having been approved by the Mechanical EngineeringIndustry Standards Committee andendorsed by the.Chairman of the Engineering DivisionalCouncilwas published under the authority of the General Council on 31st August 1967.
First published，19thDecember 1963.First revision August 1967.
The Institution desires to call attention to the fact that thisBritishStandard does not purport to include all the necessaryprovisions of a contract.
In order to keep abreast of progress in the industriesconcerned British Standards are subject to periodical review.course brought tothe notice of the mittees chargedwith Suggestions for improvements will be recorded and in duetherevision of the standards to which they refer.
A plete list of British Standards numbering over 9 000fullyindexed and with a note ofthe contents ofeach will be found in the BSI Catalogue which may be purchased fromBSI Sales Department.The Catalogue may be consulted inmany public libraries and similar institutions.
This standard makes reference to the following BritishStandards:
BS 18. Methods for tensile testing of metals.BS 131. Methods for notched bar tests. Part 3.The Charpy U-notch impact test onmetals.BS 240. Method forBrinell hardness test.Part 1.Testing of metals.BS 427. Part 1. Testing of metals. Method forVickers hardness test.BS 891. Method forRockwell hardness test.BS 1574. Split cotter pins Part 1.Testing of metals.BS 1916. Limits and fits for engineering.BS 3382. Electroplated coatings onthreaded ponents.Part 2.Zinc on steel ponents. Part 1.Cadmium on steel ponents.
BS 3382.Electroplated coatings on threaded ponents.Part 3. Nickel or nickel plus chromium on stcelponents.and copper alloy (including bras) -ponents.brass)ponents.ing brass)ponents.Part 7.Thicker platings for threaded ponents.BS 3580.Guide to design considerations on the strength ofBS 3643. ISOmetric screw threads. screw threads.Part 1.Thread data and standard thread series.Part 2.Limits and tolerances for coarse pitchseries threads.
Britishandardsrerevisedwhncessarybytheissuerofamendment slips orofrevisededitions.Itisimportant thatpossessionof the latest amendments oreditlons. usersofBritishStandardsshouldascertainthat they arein
CONTENTS
Co-operating organizations Foreword
SPECIFICATION
1.Scope 2.Finish 103. General dimensions 11 104.Length of bolts and screws 115.Ends of bolts and screws 6. Screw threads 11 117. Length of thread 12.8. Angularityandeccentricityfboltsscrews9. Chamfering and nuts washer facing.andcounter- 12sinking 1310. Strength grade designation system for steel bolts and screws11. Material andmanufactureof steelbolts and 13screws 1412. Mechanical screws propertiesofsteelbolts and 1613. Strength grade designation system for steelnuts 1615. 14. Mechanical properties of steelnuts Material and manufacture of stcel nuts 17 1716. Drilled bolts with split pin holes 1717. Marking and identification Inspection and testing 17 1918. 19. Complete designation for the purpose of anenquiry or order 19
APPENDICES
Remended gauge for checking squarenessA. of thread to face ofnutB Chemical position of steel bolts andc. Chemical position of steel nuts screws 35 37D.. Testing of mechanical properties of steel bolts. -E.Testing of mechanical properties of steel nuts and screws 85.44
