1、AN AMERICAN NATIO NAL STANDARD ASME B18.2.4.5M-2008Revision of ANSI B18.2.4.5M-1979(R2003)Metric Hex Jam NutsCopyright 2009 by the American Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted material licensed to Stanford Universi
2、ty by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when printed.ASME B18.2.4.5M-2008Revision of ANSI B18.2.4.5M-1979(R2003)Metric HexJam NutsAN AMERICAN NATIONAL STANDARDCopyright 2009 by the American Soc
3、iety of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrol
4、led when printed.Date of Issuance:March 31,2009This 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,ce
5、rtain 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
6、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 standa
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11、 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 2009 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.Copyright 2009 by the A
12、merican Society of Mechanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitte
13、d.Uncontrolled when printed.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B18 Committee.vi1Scope.12Comparison with ISO Standards.13Referenced Standards.14Terminology.15Dimensions.16Width Across Flats.37Thickness.38Tops and Bearing Surface.39Corner Fill.310 True Position of Hexagon to
14、the Tapped Hole.311 Countersink.312 Threads.313 Material and Mechanical Properties.314 Finish.315 Identification Symbols.316 Inspection and Quality Assurance.417 Dimensional Conformance.418 Designation.419 Workmanship.4Table1Dimensions of Hex Jam Nuts.2iiiCopyright 2009 by the American Society of Me
15、chanical Engineers.No reproduction may be made of this material without written consent of ASME.cCopyrighted material licensed to Stanford University by Thomson Scientific(),downloaded on Oct-05-2010 by Stanford University User.No further reproduction or distribution is permitted.Uncontrolled when p
16、rinted.FOREWORDThe B18 Standards Committee for the standardization of bolts,screws,nuts,rivets,and similarfasteners was organized in March 1922,as the B18 Sectional Committee under the aegis of theAmerican Engineering Standards Committee(later the American Standards Association,thenthe UnitedStates ofAmerica StandardsInstitute and,as ofOctober 6,1969,theAmerican NationalStandards Institute,Inc.),with the Society of Automotive Engineers and the American Societyof Mechanical Engineers as joint spo