2008_2016.pdf

Metric Continuous and Double-End StudsAN AM E R IC AN NAT IO NAL STANDARDASME B18.31.1M-2008(Revision of ASME B18.31.1M-2005)REAFFIRMED 2016Intentionally left blankASME B18.31.1M-2008(Revision of ASME B18.31.1M-2005)Metric Continuousand Double-End StudsAN AMERICAN NATIONAL STANDARDDate of Issuance:October 24,2008This Standard will be revised when the Society approves the issuance of a new edition.There willbe no addenda issued to this edition.ASME issues written replies to inquiries concerning interpretations of technical aspects of thisdocument.Periodically certain actions of the ASME B18 Committee may be published as Cases.Cases and interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org as they are issued.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 2008 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.15Dimensions.16Body Diameter.27Length.28Points.29Thread Length.210Screw Threads.211Materials and Mechanical Properties.212Identification Symbols.313Finish.314Workmanship.315Straightness.316Inspection and Quality Assurance.317Dimensional Conformance.318Clearance Holes.319Designation.3Tables1Dimensions for Continuous-Thread Studs.42Dimensions for Clamping-Type Studs.53Dimensions for Tap-End Studs(1.5D Engagement).64Body Dimensions for Double-End Studs.75Length Tolerances:LTfor Continuous-Thread and Clamping-Type Studs,and L forTap-End Studs.7Mandatory AppendixIStud Straightness,Referee Gage,and Gaging Procedures.9iiiFOREWORDAmerican National Standards Committee B18 for the standardization of bolts,screws,nuts,rivets,and similar fasteners was organized in March 1922 as Sectional Committee B18 underthe aegis of the American Engineering Standards Committee(later the American StandardsAssociation,then the United States of America Standards Institute and,as of October 6,1969,the American National Standards Institute,Inc.)with the Society of Automotive Engineers andthe American Society of Mechanical Engineers 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 B18 meeting in Atlanta,itwas reported that a survey by ASME showed considerable interest in establishing a subcommitteeto develop stud standards and 11 representatives indicated their willingness to serve on thesubcommittee.Subcommittee(SC)31 was established and drafts of SAE customary and metricstud standards were distributed for review.The first meeting of SC 31 on studs was held in April 1996 in conjunction with the ASME B18meetings in Chicago.Existing stud standards(IFI 136 Studs and Bolts and IFI 528 Metric Studsand Bolts)were compared with the draft of SAE standards J2271 Part Standard for StudsContinuous and Double End(Inch Series)and J2271M Part Standard for StudsContinuous andDouble End(Metric).The Subcomittee then identified the configurations to be developed alongwith thread sizes and diameters