1、AN AMERICAN NATIONAL STANDARD ASME B18.13.1M-2011Revision of ASME B18.13.1M-1998(R2008)Screw and Washer Assemblies:SEMS(Metric Series)REAFFIRMED 2022ASME B18.13.1M-2011Revision of ASME B18.13.1M-1998(R2003)Screw and WasherAssemblies:SEMS(Metric Series)AN AMERICAN NATIONAL STANDARDThree Park Avenue N
2、ew York,NY 10016 USADate of Issuance:October 21,2011This 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 ma
3、y 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
4、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 andc
5、omment 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 rig
6、hts 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 th
7、e 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 accep
8、ts 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
9、,without the prior written permission of the publisher.The American Society of Mechanical EngineersThree Park Avenue,New York,NY 10016-5990Copyright 2011 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.viCorrespondence With the B1
10、8 Committee.vii1Introduction.12General Data.123Helical Spring Lock Washer SEMS.144Tooth Lock Washer SEMS.155Conical Washer SEMS.156Plain Washer SEMS.15Figures1Unthreaded Length on Screws With Machine Screw Thread DiameterPitchCombinations.122Conical Spring Washer Twist Test.143Unthreaded Length on T
11、apping Screws With Spaced Thread DiameterPitchCombinations.15Tables1Dimensions of Helical Spring Lock Washers for SEMS With Machine and TappingScrews Having Machine Screw Thread DiameterPitch Combinations.22Dimensions of Helical Spring Lock Washers for SEMS With Screws HavingTapping Screw Thread Dia
12、meterPitch Combinations.33Dimensions of Internal Tooth Lock Washers for SEMS.44Dimensions of External Tooth Lock Washers for SEMS.55Dimensions of Conical Spring Washers for SEMS.66Dimensions of Plain Washers for SEMS.77Through-Hardened and Tempered SEMS.88Examples of SEMS Product Data.11Nonmandatory
13、 AppendicesAReference Information for Users of This Standard.17BPlain Washers on Tapping Screws.19CThe Relationship of This Revision to Previous Revisions of This Standard and toISO Standards.20DManufacturing.21EStatistical Expression of Hardness.22FRecovery Test.23GHow SEMS Function.24iiiFOREWORDAm
14、erican National Standards Committee B27 for theStandardization of plain and lock washers was orga-nized in March 1926 as Sectional Committee B27 underthe aegis of the American Standards Association(laterthe United States of America Standards Institute and,as of October 6,1969,the American National S
15、tandardsInstitute,Inc.)with the Society of Automotive Engineersand The American Society of Mechanical Engineers asjoint sponsors.(Since1950,this Committee hasalso beenassigned responsibility for standardization of washersand machine rings.)The Committee was reorganizedin May 1928,at which time two s
16、ubcommittees wereestablishedtocarryondevelopmentwork:Subcommittee 1*on plain washers and Subcommittee 2on lock washers.In 1940,the B27 Committee was reactivated,andSubcommittee 2 proceeded to draft a proposal coveringhelical spring lock washers.It was further amended in1943 and,following approval by the B27 Committeeand sponsor organizations,accepted as an AmericanStandard under the designation ASA B27.1-1994.A draft proposal completed by Subcommittee 2 inSeptember 1949 incorporated requirements
