ASME_B18-21.3-2008.pdf

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 license 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 permitted 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 thisdocument.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 assume 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 2008 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll rights reservedPrinted in U.S.A.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.vi1Introductory 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 Limits.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 coil 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 looking 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 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-,-,-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