ASME_B18-12-2001.pdf

ASME B18.12-2001Revision of ASA B18.12-1962(R1991)GLOSSARY OF TERMSFOR MECHANICALFASTENERSA N A M E R I C A N N A T I O N A LS T A N D A R DASME B18.12-2001Revision of ASA B18.12-1962(R1991)GLOSSARY OF TERMSFOR MECHANICALFASTENERSA N A M E R I C A N N A T I O N A LS T A N D A R DCopyrighted 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 printed.AN AMERICAN NA TIONALST ANDARDGLOSSARY OF TERMSFOR MECHANICALFASTENERSASME B18.12-2001Revision of ASA B18.12-1962(R1991)Copyrighted 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 printed.Date of Issuance:April 19,2002The 2001 edition of this Standard is being issued with an automatic addendasubscription service.The use of an addenda allows revisions made inresponse to public review comments or committee actions to be publishedas necessary.The next edition of this Standard is scheduled for publicationin 2006.ASME issues written replies to inquiries concerning interpretations oftechnical aspects of this Standard.The interpretations will be included withthe above addenda service.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 forAmerican National Standards.The Standards Committee that approved the code or standardwas balanced to assure that individuals from competent and concerned interests have had anopportunity to participate.The proposed code or standard was made available for public reviewand comment that provides an opportunity for additional public input 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 inconnection withany itemsmentioned inthis document,and doesnot undertaketo insureanyoneutilizing a standard against liability for infringement of any applicable letters patent,nor assumeany such liability.Users of a code or standard are expressly advised that determination of thevalidity of any such patent rights,and the risk of infringement of such rights,is entirely theirown responsibility.Participation by federal agency representative(s)or person(s)affiliated with industry is not tobe interpreted as government or industry endorsement of this code or standard.ASME accepts responsibility for only those interpretations of this document issued inaccordance with the established ASME procedures and policies,which precludes the issuanceof 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 2002 byTHE AMERICAN SOCIETY OF MECHANICAL ENGINEERSAll Rights ReservedPrinted in U.S.A.Copyrighted 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 printed.CONTENTSForeword.ivCommittee Roster.vCorrespondence With the B18 Committee.viii1Introduction.12Terminology.12.11Basic Fastener Terminology.2.23Fastener Characteristics(Excluding Head Styles).2.37Fastener Head Styles.2.412Dimensional Terms and Size.2.517Terms Relating to the Manufacture of Fasteners.2.619Fastener Performance Terminology.2.720Terms Relating to Material and Heat Treatment of Fasteners.2.820Coatings and Finish Terminology.2.921Quality Assurance Including Inspection Terminology.2.1022Packaging.3Product Families.223.122Externally Threaded Products.3.238Internally Threaded Products.3.342Nonthreaded Products.3.451Miscellaneous Fasteners.Tables1Common Applications of Threaded Fastener Head Styles.82Type Designations for Tapping Screws and Metallic Drive Screws.323Screw and Washer Assembly Combinations.38Index.53iiiCopyrighted 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 printed.FOREWORDSectional Committee B18 on Dimensional Standardization of Bolts,Nuts,Rivets,Screws,and Similar Fasteners was organized in March 1922 under the procedure of the AmericanStandards Association with the Society of Automotive Engineers and The American Societyof Mechanical Engineers as joint sponsors.Subcommittee 10 on the Glossary of Terms for Mechanical Fasteners was organized inFebruary 1947.The purpose of the subcommittee was to promote and coordinate thestandardization of fastener nomenclature for those products falling under the scope of