-6-4_R2005_E1998.pdf

ASME B18.6.4-1998Revision of ANSI B18.6.4-1981(R1997)THREAD FORMING AND THREAD CUTTINGTAPPING SCREWS ANDMETALLIC DRIVE SCREWS(INCH SERIES)A N A M E R I C A N N A T I O N A LS T A N D A R DASME B18.6.4-1998Revision of ANSI B18.6.4-1981(R1997)THREAD FORMING AND THREAD CUTTINGTAPPING SCREWS ANDMETALLIC DRIVE SCREWS(INCH SERIES)A 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.REAFFIRMED 2005FOR CURRENT COMMITTEE PERSONNELPLEASE E-MAIL CSasme.orgAN AMERICAN NA TIONALST ANDARDTHREAD FORMING AND THREAD CUTTINGTAPPING SCREWS ANDMETALLIC DRIVE SCREWS(INCH SERIES)ASME B18.6.4-1998Revision of ANSI B18.6.4-1981(R1997)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:December 31,1999The 1998 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 2003.ASME issues written replies to inquiries concerning interpretations oftechnical aspects of this Standard.The interpretations will be included withthe above addenda service.Interpretations are not part of the addenda tothe Standard.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 insureanyoneutilizingastandardagainstliabilityforinfringementofanyapplicableLettersPatent,norassumesany 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 preclude 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 1999 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.FOREWORDAmerican National Standards Committee B18 for the standardization of bolts,screws,nuts,rivets,and similar fasteners was organized in March 1922,as Sectional CommitteeB18 under the aegis of the American Engineering Standards Committee(later the AmericanStandards Association,then the United States of America Standards Institute and,as ofOctober 6,1969,the American National Standards Institute,Inc.),with the Society ofAutomotive Engineers and the American Society of Mechanical Engineers as joint sponsors.Subcommittee 31was subsequently established and charged with the responsibility fortechnical content of standards covering slotted and recessed head screws.An American Standard setting forth slotted head proportions was approved and publishedin April of 1930.Over the years following the issuance of this document,the need for standards morecomprehensive than head configurations became apparent.At a meeting held on April 14,1942,Subcommittee 31was reorganized and enlarged,and the following operating scopewas established:The scope of Subcommittee 31shall consist of the development and promulgation ofAmerican Standards embracing screw products variously known as machine screws,woodscrews,tapping screws,slotted head cap screws and slotted headless set screws and machinescrew nuts.The standards shall comprise co