1、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
2、 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 200
3、5FOR 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()
4、,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 revision
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12、 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
13、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
14、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 31wa
15、s 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
16、 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
