2012_2017.pdf

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 Standard 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 published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org/as they are issued.Errata to codes and standards may be posted on the ASME Web site under the Committee Pages toprovide corrections to incorrectly published items,or to correct typographical or grammatical errorsin codes and standards.Such errata shall be used on the date posted.The Committee Pages can be found at http:/cstools.asme.org/.There is an option available toautomatically receive an e-mail notification when errata are posted to a particular code or standard.ThisoptioncanbefoundontheappropriateCommitteePageafterselecting“Errata”inthe“PublicationInformation”section.ASME is the registered trademark of The American Society of Mechanical Engineers.This code or standard was developed under procedures accredited as meeting the criteria for American NationalStandards.The Standards Committee that approved the code or standard was balanced to assure that individuals fromcompetent and concerned interests have had an opportunity to participate.The proposed code or standard was madeavailable forpublic review andcomment thatprovides an opportunityfor additional publicinput from industry,academia,regulatory agencies,and the public-at-large.ASME does not“approve,”“rate,”or“endorse”any item,construction,proprietary device,or activity.ASME does not take any position with respect to the validity of any patent rights asserted in connection with anyitems mentioned in this document,and does not undertake to insure anyone utilizing a standard against liability forinfringement of any applicable letters patent,nor assume any such liability.Users of a code or standard are expresslyadvised that determination of the validity of any such patent rights,and the risk of infringement of such rights,isentirely their own responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not to be interpreted asgovernment or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued in accordance with the establishedASME procedures and policies,which precludes the issuance of interpretations by individuals.No part of this document may be reproduced in any form,in an electronic retrieval system or otherwise,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree 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.22Dimensions 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 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 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 Engineers(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 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