2-4M_R1994_E1980.pdf

A M E R I C A N N A T I O N A L S T A N D A R D Preferred Metric Sizes for Round,Square,Rectangle and Hexagon Metal Products ANSI B32.4M-1980(REVISION OF ANSI B32.4-1977),-.F 1 REAFFIRMED 1994 FOR CURRENT COMMITTEE PERSONNEL PLEASE SEE ASME MANUAL AS-1 1 SECRETARIAT THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS PUBLISHED BY T H E A M E R I C A N S O C I E T Y O F M E C H A N I C A L E N G I N E E R S United Engineering Center 345 East 47th Street New York,N.Y.1001 7 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:June 15.1980 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.Copyright 0 1980 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed 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.FOREWORD The U.S.Department of Commerce in its July 1971 report to Congress titled“A Metric America-A decision whose time has come”recommended that the United States should change to the metric system through a coordinated national program.This action along with subsequent increased metric activity in in-dustry resulted in a number of requests from producers and users that the B32 committee develop preferred series of metric sizes for the various forms of wrought mill metal products.On January 17,1973 Subcommittees 1 and 2 were formed to establish preferred metric sizes of flat and round metal products respectively.Subsequently Subcommittee 2 had its scope enlarged to include square and hexagon products.Subcommittee 4 was formed on October 24,1973,to consider tubular products.These committees are composed of representatives of the major metal trade associations and user groups.After several meetings,unanimous agreement was reached by Subcommittee 2 on the preferred metric sizes for round,square and hexagon wrought metal products.These considerations guided the committee:preferred number sizes included in IS0 recommendations R 388,sizes actually used in metric countries,and rounded metric equivalents of high activity inch sizes used in the United States.Sizes in Table 3 agree in all instances with hexagon metric fastener sizes.The proposal received Standards Committee B32 approval on June 4,1974.It was subsequently approved by the sponsor and submitted to the American National Standards Institute for designation as an American National Standard.This was granted on July 9,1974.The First Edition was very favorably received and the dynamic metrication planning activity which it generated prompted the Committee to expand the coverage.Requests were received to issue separate tables for squares and hexagons and to establish a series of preferred lengths within the limits of Tables 1,2 and 3 which are supplied in straight lengths.This was done after due deliberation.In addition fourteen third preference diameters were added.The.Second Edition proposal received Standards Committee B32 approval on August 17,.1976,and was approved as an American National Standard on April 7,1977.The Third Edition incorporates rectangles not previously covered in ANSI B32.3.This proposal re-ceived Standards Committee B32 approval on December 10,1979 and was approved as an American National Standard on April 14,1980.iii 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.AMERICAN NATIONAL STANDARDS COMMITTEE B32 Standardization of Metal and Metal Alloy Wrought Mill Product Nominal Sizes(The following is the roster of the committee at the time of the approval of the standard)OFFICERS Arthur Cohen,Chairman R.J.Henke,Secretary AEROSPACE INDUSTRIES ASSOCIATION OF AMERICA J.A.Fedorochko,General Electric Company,Philadelphia,Pennsylvania J.P.Reese,Alternate,Aerospace Industries Association of America,Washington,D.C.ALUMINUM ASSOCIATION,THE B.M.Peak,Aluminum Company of America,Pittsburgh,Pennsylvania J.W.Barr,Alternate,The Aluminum Association,New York,New York AMERICAN IRON&STEEL INSTITUTE N.B.Jusrer,Inland Steel Company,Chicago,Illinois D.E.Ballanfyne,U.S.Steel Corporation,Pittsburgh,Pennsylvania AMERICAN SOCIETY FOR METALS R.B.Liss,Caterpillar Tractor Company,Peoria,Illinois AMERICAN SOCIETY OF MECHANICAL ENGINEERS,THE A.R.Machell,Jr.,Xerox Corp.,Rochester,New York COLD FINISHED STEEL BAR INSTITUTE M.D.Ofraviani,Teledyne Columbia-Summerill,Pittsburgh,Pennsylvania COPPER DEVELOPMENT ASSOCIATION,INC.Arthur Cohen,Copper Development Association,New York,New York ELECTRONIC INDUSTRIES ASSOCIATION E.C.Slick,Sylvania Electric Products,In