2009_2021.pdf

AN AMERICAN NATIO NAL STANDARD ASME B18.31.4M-2009Threaded Rod(Metric Series)REAFFIRMED 2021Intentionally left blank ASME B18.31.4M-2009Threaded Rod(Metric Series)AN AMERICAN NATIONAL STANDARDDate of Issuance:January 11,2010This 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 thisStandard.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 assumes 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 2010 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B18 Committee.vi1Introduction.12Comparison to ISO Documents.13Referenced Standards.14Terminology.15Dimensions.16Length.17Ends.18Screw Threads.29Straightness.210 Material and Mechanical Requirements.211 Finish.312 Workmanship.313 Alloy and Property Class Symbol and Manufacturers Marking.314 Inspection and Quality Assurance.315 Coating Thickness Conformance.316 Material and Mechanical Conformance.317 Reporting of Inspection Results.318 Designation.3Table1Dimensions for Metric Threaded Rod.2iiiFOREWORDIn September 2008,ASME B18 Subcommittee 31 received a request to develop a standard forinch dimensioned threaded rod.This resulted in the development and balloting of a draft forASME B18.31.3,Threaded Rod(Inch Series).Subsequently it was decided that a companiondocumentformetricthreadedrodshouldbedeveloped.Althoughthreadedrodiswidelyavailablein the marketplace,there were no current ISO or American National Standards for threadedrod.DOD-S-63543 and DOD-S-63543/2 specifications,covering metric threaded rod in severalmaterials,were cancelled in 1995.This Standard specifically identifies many of the most common materials and coatings availablein threaded rod but is also applicable to other materials and coatings as specified by a purchaser.Standard lengths are identified but this Standard permits other lengths to be ordered.The first draft was balloted in March 2009 with a single disapproval.Subcommittee 31 adjudi-catedthecommentsandagreedtomakeseveralchanges.Thechangeswereballotedandapprovedby B18 Subcommittee 31 and by the B18 Standards Committee with the closure of a ballot inAugust 2009.This Standard was approved by the American National Standards Institute onDecember 2,2009.ivASME B18 COMMITTEEStandardization of Bolts,Nuts,Rivets,Screws,Washers,and Similar Fasteners(The following is the roster of the Committee at the time of approval of this Standard.)STANDARDS COMMITTEE OFFICERSJ.Greenslade,ChairD.S.George,Vice ChairR.D.Strong,Vice ChairC.J.Gomez,SecretarySTANDARDS COMMITTEE PERSONNELV.Cartina,Autocraft IndustrialD.A.Clever,ConsultantA.P.Cockman,Ford Motor Co.C.A.Dugal de la Garza,TSP,Inc.D.S.George,ND IndustriesC.J.Gomez,The American Society of Mechanical EngineersJ.Greenslade,Industrial Fasteners InstituteJ.J.Grey,Contributing Member,Fastener Consulting Services,Inc.B.Hasiuk,Contributing Member,Defense Supply CenterPhiladelphiaA.Herskovitz,Cons