1、Double Coil Helical Spring Lock Washers for Wood StructuresAN AMERICAN NATIO NAL STANDARDASME B18.21.3-2008Copyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies/5914950002 Not for Resale,05/13/2009 00:36:00 MDTNo reproduction or networking permitted without l
2、icense from IHS-,-,-ASME B18.21.3-2008Double Coil HelicalSpring Lock Washersfor Wood StructuresAN AMERICAN NATIONAL STANDARDCopyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies/5914950002 Not for Resale,05/13/2009 00:36:00 MDTNo reproduction or networking pe
3、rmitted without license from IHS-,-,-Date of Issuance:September 19,2008This 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 this
4、document.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 Engineer
5、s.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
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9、nment 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 repr
10、oduced 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
11、.Copyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies/5914950002 Not for Resale,05/13/2009 00:36:00 MDTNo reproduction or networking permitted without license from IHS-,-,-CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B18 Committee.vi1Introduc
12、tory Notes.12General Data.1Figure1Washer Twist Test.4Tables1Dimensions for Double Coil Helical Spring Lock Washers for Wood Structures.32Dimensions for Extended Travel Double Coil Helical Spring Lock Washers for WoodStructures.43Decarburization Limits.44Standard Travel Limits.45Extended Travel Limit
13、s.4iiiCopyright ASME International Provided by IHS under license with ASME Licensee=FMC Technologies/5914950002 Not for Resale,05/13/2009 00:36:00 MDTNo reproduction or networking permitted without license from IHS-,-,-FOREWORDOn November 29,2006,a proposed draft for a new standard to cover double c
14、oil helical springlock washers for high voltage wood structures was presented to the members present at theASME B18 Subcommittee meetings.The Committee agreed that Subcommittee 21 should proceedwith the proposed standard,eliminating the words“high voltage”so the standard could be usedby anyone looki
15、ng for a lock washer for wooden structures,with the designation being B18.21.3.ASME B18.21.3-2008 was approved by B18 Subcommittee 21 and the B18 Standards Committeeon December 21,2007.This Standard was approved by the American National Standards Instituteon March 28,2008.ivCopyright ASME Internatio
16、nal Provided by IHS under license with ASME Licensee=FMC Technologies/5914950002 Not for Resale,05/13/2009 00:36:00 MDTNo reproduction or networking permitted without license from IHS-,-,-ASME 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 OFFICERSD.A.Clever,ChairR.D.Strong,Vice ChairS.W.Vass,Vice ChairR.L.Crane,SecretarySTANDARDS COMMITTEE PERSONNELV