ASME_B18.31.2-2014.pdf

AN AM E R IC AN NAT IO NAL STANDARD ASME B18.31.2-2014(Revision of ASME B18.31.2-2008)Continuous Thread Stud,Double-End Stud,and Flange Bolting Stud(Stud Bolt)(Inch Series)INTENTIONALLY LEFT BLANK ASME B18.31.2-2014(Revision of ASME B18.31.2-2008)Continuous ThreadStud,Double-EndStud,and FlangeBolting Stud(StudBolt)(Inch Series)AN AMERICAN NATIONAL STANDARDTwo Park Avenue New York,NY 10016 USADate of Issuance:October 29,2014This 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.Interpretations are published on the Committee Web page and under go.asme.org/InterpsDatabase.Periodically certain actions of the ASME B18 Committee may be published asCases.Cases are published on the ASME Web site under the B18 Committee Page at go.asme.org/B18committee 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 B18 Committee Page can be found at go.asme.org/B18committee.There is an option availableto automatically 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 EngineersTwo Park Avenue,New York,NY 10016-5990Copyright 2014 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.viCorrespondence With the B18 Committee.vii1Introduction.12Comparison With ISO Documents.13Referenced Standards.14Terminology.25Dimensions.26Body Diameter.27Stud Length.28Stud Ends.79Thread Length.710 Screw Threads.711 Materials and Mechanical Properties.712 Identification Symbols.813 Finish.814 Workmanship.815 Straightness.816 Inspection and Quality Assurance.817 Clearance Holes.818 Stud Designation.8Figure1Relationship of Dimensions,L and U,on Flange Bolting Studs(Stud Bolts).2Tables1Dimensions for Continuous Thread Studs.32Dimensions for Clamping Type Studs.43Dimensions for Tap-End Studs(1.5D Engagement).54Body Diameters for Double-End Studs.65Continuous Thread and Double-End Stud Length Tolerances.76Flange Bolting Stud(Stud Bolt)Length Tolerances.7iiiFOREWORDASMEStandardsCommitteeB18fortheStandardizationofBolts,Nuts,Rivets,Screws,Washers,and Similar Fasteners(formerly American National Standards Committee B18)was organizedin March 1922 as Sectional Committee B18 under theaegis of the American Engineering StandardsCommittee(later the American Standards Association,then the United States of AmericaStandards Institute,and,as of October 6,1969,the American National Standards Institute,Inc.ANSI)with the Society of Automotive Engineers(SAE)and the American Society of MechanicalEngineers(ASME)as joint sponsors.In 1995,the SAE Ship Systems and Equipment Committee that was preparing fastener partstandards for the shipbuilding industry asked ASME Committee B18 if there was an interest indeveloping dimensional standards for studs.At the December 1995 meeting of B18 in Atlanta,it was reported