1、AN AM E R IC AN NAT IO NAL STANDARD ASME B18.5-2012(Revision of ASME B18.5-2008)Round Head Bolts(Inch Series)REAFFIRMED 2017ASME B18.5-2012(Revision of ASME B18.5-2008)RoundHeadBolts(Inch Series)AN AMERICAN NATIONAL STANDARDThree Park Avenue New York,NY 10016 USADate of Issuance:August 13,2012This S
2、tandard will be revised when the Society approves the issuance of a new edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisStandard.Periodically,certain actions of the ASME B18 Committee may be published as Cases.Casesand interpretations are publi
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11、Three Park Avenue,New York,NY 10016-5990Copyright 2012 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.viCorrespondence With the B18 Committee.vii1Introductory Notes.12General Data.12Tables1Dimensions of Round Head Bolts.22Dimensi
12、ons of Round Head Square Neck Bolts.33Dimensions of Round Head Short Square Neck Bolts.44Dimensions of Round Head Ribbed Neck Bolts.55Dimensions of Round Head Fin Neck Bolts.66Dimensions of Step Bolts.77Dimensions of Countersunk Bolts and Slotted Countersunk Bolts.88Dimensions of 114-deg Countersunk
13、 Square Neck Bolts.99Dimensions of Flat Countersunk Head Elevator Bolts.1010Dimensions of T-Head Bolts.11Mandatory AppendixIGaging Length of Square Neck.15iiiFOREWORDAmerican National Standards Committee B18 for the standardization of bolts,screws,nuts,rivets,and similar fasteners was originated in
14、March 1922 as Sectional Committee B18,underthe aegis of the American Engineering Standards Committee later the American StandardsAssociation,the United States of America Standards Institute,and as of October 6,1969,theAmerican National Standards Institute,Inc.(ANSI),with the Society of Automotive En
15、gineers(SAE)andthe AmericanSociety of MechanicalEngineers(ASME)as joint sponsors.Subcommittee5 was subsequently established and charged with the responsibility for technical content ofstandards covering round unslotted head bolts.The initial proposal completed by the Subcommittee in February of 1923
16、 consisted of standardscovering head dimensions for carriage,step,and round head machine bolts.Circulation of theoriginal draft and numerous revisions thereto culminated in a document that was issued as aTentative American Standard on February 20,1928.In 1934,Subcommittee 5 initiated work on a revision of the standard to bring it into linewith altered consumer requirements and refinements in manufacturing technology.A proposalcontaining dimensional changes and additional data was duly approved a
