1、AN AMERICAN NATIO NAL STANDARD ASME B18.21.1-2009(Revision and consolidation of ASME B18.21.1 and ASME B18.22.1)Washers:Helical Spring-Lock,Tooth Lock,and Plain Washers(Inch Series)REAFFIRMED 2016Intentionally left blank ASME B18.21.1-2009(Revision and consolidation of ASME B18.21.1 and ASME B18.22.
2、1)Washers:HelicalSpring-Lock,ToothLock,and PlainWashers(Inch Series)AN AMERICAN NATIONAL STANDARDDate of Issuance:January 22,2010This 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 inquiri
3、es concerning interpretations of technical aspects of thisStandard.Periodically certain actions of the ASME B18 Committee may be published as Cases.Casesand interpretations are published on the ASME Web site under the Committee Pages athttp:/cstools.asme.org as they are issued.ASME is the registered
4、 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 conce
5、rned 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
6、,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 applica
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9、ations 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
10、OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.CONTENTSForeword.ivCommittee Roster.viiCorrespondence With the B18 Committee.viii1General Data Related to All Washers.12General Data for Helical Spring-Lock Washers.23General Data for Tooth-Lock Washers.84General Data for Plain Washers(Flat
11、and Fender).14Figures1Verifying Minimum Bearing Width.72Washer Twist Test.83Tooth Lock Washers.8Tables1Dimensions of Regular Helical Spring-Lock Washers.32Dimensions of Heavy Helical Spring-Lock Washers.43Dimensions of Extra-Duty Helical Spring-Lock Washers.54Dimensions of High-Collar Helical Spring
12、-Lock Washers.65Decarburization Limits.66Dimensions of Internal Tooth-Lock Washers.97Dimensions of Heavy Internal Tooth-Lock Washers.108Dimensions of External Tooth-Lock Washers.119Dimensions of Countersunk External Tooth-Lock Washers.1210Dimensions of Internal/External Tooth-Lock Washers.1311Dimens
13、ions of Preferred Sizes of Type A Plain Washers.1512Dimensions of Type B Plain Washers.1713Fender Washers.20iiiFOREWORDIn response to the request of the U.S.War Department the American National StandardsCommittee B27,for the standardization of plain and lock washers was organized between August1925
14、and March 1926 as Sectional Committee B27 under the aegis of the American StandardsAssociation(later the American Engineering Standards,then The United States of AmericaStandards Institute,the American National Standards Institute and in subsequent years,thecommittee came under the sole sponsorship
15、of the American Society of Mechanical Engineers(ASME).In May 1928,the B27 Committee established two subcommittees to carry on developmentwork,Subcommittee 1 on plain washers and Subcommittee 2 on lock washers.Subcommittee 2 circulated a tentative standard for helical spring-lock washers for industry
16、comment in November 1931,but failed to achieve acceptanceand committee activity was dormantfor some years.In 1940 the Subcommittee 2 project was reactivated and proceeded to draft aproposalcovering threeseries ofhelicalspring-lock washersdesignated light,medium,and heavy.In 1943 this proposal was amended to include the extra-heavy series washers and followingapproval by the B27 Committee and sponsor organizations it was accepted as an AmericanStandard under the designation ASA B27.1-1944.Subcomm
