1、ASME B18.16M-2004Prevailing-Torque TypeSteel MetricHex Nuts andHex Flange NutsRevision and Consolidation of ASME B18.16.1M,B18.16.2M,and B18.16.3MAN AMERICAN NATIONAL STANDARDThe American Society ofMechanical EngineersThree Park Avenue.New York,NY 10016CONTENTSForeword.ivCommittee Roster.,.Correspon
2、dence With the B18 Committee.vii1 Scope12Comparison With Iso Standards.3Reference StandardsA4Terminology25Dimensions36Nut Designs and Property Classes.27Width Across Flats28Thickness.29 Wrenching Heightw10 Gaging of Hex Portion of Hex Flange Nuts.311 Flange612 Bearing Surface.,.613 Countersink.b14 T
3、hreads615 Material,Mechanical,and Performance Properties616 Testing117 Identification Symbols.1018 Finish1019 Workmanship1020 Options.1021 Inspection and Quality Assurance1022 Designation10Figure1 Load Measuring Device.8Tables1Dimensions of Prevailing-Torque Hex Nuts-Property Classes 5,9,and 10.32Di
4、mensions of Prevailing-Torque Hex Flange Nuts-Property Classes 5,9,and 10.4Proof Loads,Clamp Loads,and Prevailing Torques for Nuts.4Examples for Test Clamp Torque Values.7Test Washers9i进FOREWORDAmerican National Standards Committee B18 for the standardization of bolts,screws,nuts,riv-ets,and similar
5、 fasteners was organized in March 1922 as Sectional Committee B18 under theaegis of the American Engineering Standards Committee(later the American Standards Associ-ation,the United States of America Standards Institute and,as of October 6,1969,the AmericanNational Standards Institute,Inc.)with the
6、Society of Automotive Engineers and the AmericanSociety of Mechanical Engineers as joint sponsors.Subcommittee 16 was established in 1961 andcharged with the responsibility for technical content of standards covering prevailing-torque nuts.In 1972 the International Organization for Standardization p
7、ublished standards ISO 2320 andISO 2358,covering the mechanical and performance properties and dimensions of metric serieshexagon prevailing-torque type nuts,respectively.In December 1974,Committee B18 directed Subcommittee 16 to discontinue work on standardsfor inch series prevailing-torque type he
8、x nuts and to develop standards for metric series nuts.As a result,ASME B18.16.1M-1979,ASME B18.16.2M-1979,and ASME B18.16.3M-1982 wereapproved.B18.16.3M was revised in 1998 to better meet the needs of conformance with PublicLaw 100-592.The revision defined those dimensions or characteristics which
9、should be certifiedto assure product fit,form,and function.Other dimensions given would only be examined in theevent of a dispute.Additionally,the Subcommittee removed the bearing surface finish require-ment from the dimensional tables.It was felt that the torque at tension requirements of B18.16.2M-1979 adequately addressed the functional need for this characteristic.This Standard,ASME B18.16M-2004,is a revision and consolidation of ASME B18.16.1M-1979,ASME B18.16.2M-1979,and ASME B18.16.3M-1998.This Standard was approved as an American National Standard on September 9,2004.iv
