1、A M E R I C A N N A T I O N A L S T A N D A R D Metric Slotted Hex Nuts ANSI B18.2.4.3M-1979._-Government Key Words:Nut,Slotted,Hex-Metric REAFFIRMED 1995 FOR CURRENT COMMITTEE PERSONNEL PLEASE SEE ASME MANUAL AS-1 1 SECRETARIAT SOCIETY OF AUTOMOTIVE ENGINEERS THE AMERICAN SOCIETY OF MECHANICAL ENGI
2、NEERS PUBLISHED B Y T H E A M E R I C A N S O C I E T Y OF 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 2017Date of Issuance:May 15,1980 No part of this document may be reproduced in any form,in an electronic retrieval system or
3、otherwise,without the prior written permission of the publisher.THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS Copyright 0 1980 by All Rights Reserved Printed in U.S.A.ERRATA to ANSI B18.2.4.3M-1979 METRIC SLOTTED HEX NUTS Page 4,in the standard shall be replaced with the second page of this Errata Pa
4、ge 7,for MATERIAL AND FINISH CODE A and B,change 0.005 mm to read 5.1 pm THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS 345 East 47 Street,New York,N.Y.1001 7 M0119E May 1981 AMERICAN NATIONAL STANDARD METRIC SLOTTED HEX NUTS ANSI 618.2.4.3M-1979 t-I s Thread Pitch M5 x 0.8 8.00 7.78 M6x 1 10.00 9.78
5、M8 x 1.25 13.00 12.73 MlOx 1.5 16.00 15.73 M12 x 1.75 18.00 17.73 M14x 2 21.00 20.67 M16 x 2 24.00 23.67 M20 x 2.5 30.00 29.16 M24x 3 36.00 35.00 M30 x 3.5 46.00 45.00 M36x4 55.00 53.80 to Para.I 4 Refer MlOx 1.5 I 15.00 I 14.73 N 3-Table 1 Dimensions of Slotted Hex Nuts E Width Across Corners 7 M T
6、hickness-Max-5.1 0 5.70 7.50 9.30 12.00 14.10 16.40 20.30 23.90 28.60 34.70-5-Min 4.80 5.40 7.14 8.94 1 1.57 13.40 15.70 19.00 22.60 27.30 33.10-Dw I F Bear-I ing Face 1 Dia Unslottad Thickness Min Max 6.9 3.2 8.9 3.5 11.6 4.4 14.6 5.2 16.6 7.3 19.6 8.6 22.5 9.9 27.7 13.3 33.2 15.4 42.7 18.1 51.1 23
7、.7 6 I 10-Min 2.9 3.2 4.1 4.9 6.9 8.O 9.3 12.2 14.3 16.8 22.4-Width of Slot Washer Face Thickness Max Min Max Min 2.0 1.4-2.4 la-2.9 2.3-3.4 2.8-4.0 3.2-4.3 3.5-5.3 45-0.4 1 1 Total Runout of Bearing Surface F IM Max 0.30 0.33 0.36 0.39 0.42 0.45 0.48 0.56 0.64 0.76 0.89-6 0.39-See Para.2.2 in Gener
8、al Data.4 American National Standards Committee B18 for the standardization of bolts,screws,nuts,rivets and similar fasteners was organized in-March 1922,as Sectional Committee B18 under the aegis of the American Engineering Standards Committee (later the American Standards Association,then the Unit
9、ed States of America Standards Institute and,as of October 6,1969,the American National Standards Institute,Inc.),with the Society of Automotive Engineers and the American Society of Mechanical Engineers as joint sponsors.Subcornmitee 2 was subsequently established and charged with the responsibilit
10、y for technical content of stan-dards covering wrench head bolts and nuts.At its meeting on December 4,1974,Committee B18 authorized preparation of a series of standards for metric fasteners.Subcommittee 2 was assigned responsibility for developing standards for metric hex bolts,screws and nuts.At a
11、 meeting on September 22,1976,Subcommittee 2 organized the contents of a standard covering six different styles of hex nuts.Actual drafting was postponed until ISO/TC2 could reach final decisions relating to basic dimensions and characteristics of hex bolts,screws and nuts.At ISO/TC2 meetings held i
12、n April 1977,final.actions were taken,Committee B18 affirmed the TC2 decisions at a meeting on June 29,1977,and draft-ing of t h i s standard was started.In February 1978,Committee B18 established a cooperative program with the Department of Defense to draft American National Standards for metric fa
13、steners in such a way that they could be used directly by the Government for procurement purposes.The Department of Defense requested that each of the six nut products be covered in separate standards,and Subcommittee 2 accepted t h i s approach at its meeting on June 27,1978.This standard was appro
14、ved by letter ballot of Committee B18 on July 2,1979,and was subsequently approved by the secretariats and submitted to the American National Standards Institute for designation as an American National Standard.This was granted on December 6,1979.iii Intentionally left blank AMERICAN NATIONAL STANDA
15、RDS COMMITTEE B18 STANDARDIZATION OF BOLTS,NUTS,RIVETS,SCREWS WASHERS AND SIMILAR FASTENERS OFFICERS R.P.Trowbridge,Chairmen J.B.Levy,Vice Chairman H.G.Muenchingar,Vice Chairman Richard McGinnis,Secretary COMMITTEE PERSONNEL AMERICAN CHAIN ASSOCIATION L.E.Hampel,Moline Malleable Iron Company,St.Char
16、les,Illinois AMERICAN HARDWARE MANUFACTURERS ASSOCIATION Donald Wanek,Wrought Washer Manufacturing Company,Milwaukee,Wisconsin AMERICAN INSTITUTE OF INDUSTRIAL ENGINEERS R.T.Kelly,Hitchcock Publishing Company,Wheaton,Illinois AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS E.R.Friesth,Deere&Company,Moline,Illinois AMERICAN SOCIETY OF MECHANICAL ENGINEERS,THE A.R.Machell,Jr.Xerox Corporation,Rochester,New York F.P.Tisch,Desert Hot Springs,California R.P.Trowbridge,GM Technical Center,Warren,Michigan C
