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A M E R I C A N N A T I O N A L S T A N D A R D General Tolerances for Metric Dimensioned Products ANSI B4.3-1978 REAFFIRMED 1999 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 REAFFIRMED 2004FOR CURRENT COMMITTEE PERSONNELPLEASE E-MAIL CSasme.orgNo 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 01978 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A.标准分享网 w w w.b z f x w.c o m 免费下载w w w.b z f x w.c o mFOREWORD The American National Standards Committee B4 was reorganized in November 1975 and renamed“Standardization of Allowances and Tolerances for Manufactured Parts”.A need for a general tolerancing system similar to,and recommended to be used with,the ANSI B4.2 standard on Preferred Metric Limits and Fits was recognized.The International Standard IS0 2768,Permissible Machining Variations in Dimen-sions Without Tolerance Indications,was prepared by the Technical Committee ISO/TC3-Limits and Fits,for the above purpose,and it was approved by the U.S.A.and 22 other countries in 1972.It was decided by the B4 Committee that a similar American standard be prepared based on the IS0 2768 standard.A draft proposal was circulated for letter ballot of the Committee on October 14,1976.Comments received as a result of this ballot led to changes of the original draft proposal and subsequent approval of the text by the B4 Standards Committee.Final approval for this standard was granted by the American National Standards Institute on 16 March 1978.iii w w w.b z f x w.c o mAMERICAN NATIONAL STANDARDS COMMITTEE B4 Standardization of Allowances and Tolerances for Manufactured Parts(The following is the roster of the Committee at the time of approval of this Standard)OFFICERS Knut 0.Kverneland,Chairman C.J.Gomez,Secretary COMMITTEE PERSONNEL AMERICAN MEASURING TOOL MANUFACTURERS ASSOCIATION R.P.Knittel,Glastonbury Gage,REB Industries,Inc.,Glastonbury,Connecticut AMERlCAN SOCIETY OF MECHANICAL ENGINEERS,THE A.E.Merritr,Harnischfeger Corporation,Milwaukee,Wisconsin R.T.Woyrhal,Standard Machine Div.,Kearney&Trecker Corporation,Milwaukee,Wisconsin ANTI-FRICTION BEARING MANUFACTURERS ASSOCIATION,THE K.0.MacKenzie,The Barden Corporation,Danbury,Connecticut COMPUTERS AND BUSINESS EQUIPMENT MANUFACTURERS ASSOCIATION A.E.Mall,International Business Machines Corporation,Endicott,New York METAL CUTTING TOOL INSTITUTE 0.J.Emanuelli,Greenfield Tap&Die,A UnitedGreenfield Div.of TRW,Inc.,Greenfield,Massachusetts NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION F.V.Kupchk,Westinghouse Electric Corporation,R&D Center,Pittsburgh,Pennsylvania R.L.Mancini,Alternate,National Electrical Manufacturers Association,New York,New York NATIONAL FLUID POWER ASSOCIATION J.R.Luecke,National Fluid Power Association,Milwaukee,Wisconsin NATIONAL MACHINE TOOL BUILDERS ASSOCIATION F.S.Blackall,111,The Taft-Peirce Manufacturing Company,Woonsocket,Rhode Island W.L.McCann,Fond du Lac,Wisconsin SOCIETY OF AUTOMOTIVE ENGINEERS,INC.K.0.Kverneland,Massey-Ferguson,Inc.,Detroit,Michigan J.E.Long,General Motors Technical Center,Warren,Michigan C.W.Srockwell,International Harvester,Hinsdde,Illinois SOCIETY OF MANUFACTURING ENGINEERS J.P.Wood,Society of Manufacturing Engineers,Dearborn,Michigan SPORTING ARMS&AMMUNITIONS MANUFACTURERS ASSOCIATION J.F.W&h,Winchester-Western,Olin Corporation,New Haven,Connecticut U.S.DEPARTMENT OF THE ARMY M.E.Taylor,U.S.Army Armament Research Development Command,Dover,New Jersey U.S.DEPARTMENT OF THE NAVY C.A.Fulesdy,Naval Ship Systems Command,Washington,D.C.R.M.Perros,Alternate,Naval Ship Systems Command,Washington,D.C.U.S.MACHINE,CAP,WOOD&TAPPING SCREW BUREAUS H.G.Muenchingef,Continental Screw Company,New Bedford,Massachusetts V 标准分享网 w w w.b z f x w.c o m 免费下载w w w.b z f x w.c o mINDIVIDUAL COMPANIES D.C.Blewitt,Xerox Corporation,Webster.New York W.K.Luety,Alternate,Xerox Corporation,Webster.New York D.E.Wendeln,Monsanto Research,Miamisburg.Ohio INDIVIDUAL MEMBERS H.W.Fahrlander.Sr.,St.Petersburg,Florida R.E.W.Harrison,Harrison Engineering Services,Washington,D.C.A.0.Schmidt.University of Wisconsin,Milwaukee,Wisconsin vi w w w.b z f x w.c o mCONTENTS Page 1.Scope.1.2.Tolerance Indication 1 3.General Tolerance Note 1.Tables Table 1 General Tolerance.Linear Dimensions.2 Table 2 General Tolerance.Angles and Tapers.2 VU 标准分享网 w w w.b z f x w.c o m 免费下载w w w.b z f x w.c o mANSI 84.3-1978 AMERICAN NATIONAL STANDARD GENERAL TOLERANCES FOR METRIC DIMENSIONED PRODUCTS 1 SCOPE This standard shows how to specify the general tolerances for metric dimensions without tolerance designation.The fine and medium tolerance series,as shown in Table 1,are mostly applicable to machined part