1、AMERICAN NATIONAL STANDARD 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 ENGINEERS P
2、UBLISHED BY THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS United Engineering Center 345 East 47th Street New York, N.Y. 1001 7 Date of Issuance: May 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
3、 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 Page 7, for MATERIAL AND FINISH CODE A and B, ch
4、ange 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 M8 x 1.25 13.00 12.73 MlOx 1.5 16.00 15.7
5、3 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 Thickness - Max - 5.1 0 5.70 7.50 9.30 1
6、2.00 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 6 I 10 - Min 2.9 3.2 4.
7、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 Par
8、a. 2.2 in General 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 Asso
9、ciation, then the United 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 cha
10、rged with the responsibility 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 metri
11、c hex bolts, screws and nuts. At a 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, scre
12、ws and nuts. At ISO/TC2 meetings held in April 1977, final .actions were taken, Committee B18 affirmed the TC2 decisions at a meeting on June 29,1977, and draft- ing of this standard was started. In February 1978, Committee B18 established a cooperative program with the Department of Defense to draf
13、t American National Standards for metric fasteners 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 this approach at its meeti
14、ng on June 27,1978. This standard was approved 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 I
15、ntentionally left blank AMERICAN NATIONAL STANDARDS 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
16、 ASSOCIATION L. E. Hampel, Moline Malleable Iron Company, St. Charles, 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
17、 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. R
18、. Adams, Alfernafe, Newport News Shipbuilding & Dry Dock Co., Newport News, Virginia K. . McCullough, Alternate, SPS Technologies, Inc., Jenkintown, Pennsylvania ANTI-FRICTION BEARING MANUFACTURERS ASSOCIATION W. J. Derner, FMC Corporation, Indianapolis, Indiana ENGINE MANUFACTURERS ASSOCIATION K. F
19、. Naylor, Cumins Engine Company, Columbus, Indiana FARM & INDUSTRIAL EQUIPMENT INSTITUTE E. R. Friesth, Deere & Company, Moline, Illinois HAND TOOLS INSTITUTE C. B. lngersoll, J. H. Williams Company, Buffalo, New York INDUSTRIAL FASTENERS INSTITUTE R. B. Belford, Industrial Fasteners Institute, Clev
20、eland, Ohio A. R. Breed, The Lamson & Sessions Company, Cleveland, Ohio D. A. Garrison, Russell, Burdsall & Ward Inc., Rock Falls, Illinois R. W. Groover, Bethlehem Steel Company, Lebanon, Pennsylvania E. J. Heldmann, Holo-Krome Company, West Hartford, Connecticut Jack Shugart, Rockford Products Cor
21、poration, Rockford, Illinois D. P. Wagner, Illinois Tool Works, Inc., Elgin, Illinois D. D. yyheeler, Armco Steel Corporation, Kansas City, Missouri N. W. Bellas, Alternate, Illinois Tool Works, Inc., Elgin, Illinois R. M. Harris, Alternate, Bethlehem Steel Corporation, Lebanon, Pennsylvania F. R. L
22、ing, Alfernafe, Russell, Burdsall& Ward, Inc., Mentor, Ohio METAL CUTTING TOOL INSTITUTE Din0 EmanoeNi, Greenfield Tap & Die, Greenfield, Massachusetts V NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION J. B. Levy, General Electric Company, Schenectady, New York F. F. Weingmber, Westinghouse Electric C
23、orporation, Pittsburgh, Pennsylvania W. K. Gerrish, Alternate, National Electrical Manufacturers Association, Washington, D.C. NATIONAL ELEVATOR INDUSTRY, INC. R. J. Cummings, Otis Elevator Company, Mahwah, New Jersey SOCIETY OF AUTOMOTIVE ENGINEERS H. W. /ison, General Motors Corporation, Warren, M
24、ichigan S E. Mallen, Ford Motor Company, Dearborn, Michigan R. S Piotmwski, Mack Trucks, Inc., Allentown, Pennsylvania C. F. Schaening, GM Engineering Standards Section, Warren, Michigan R. R. Sjoberg, International Harvester Company, Hinsdale, Illinois 0. W. Vial, Chrysler Corporation, Detroit, Mic
25、higan TELEPHONE GROUP R. A. Agnew, Western Electric Company, Chicago, Illinois R. Morse, Bell Laboratories, Columbus, Ohio H. Haefeli, Alternate, Bell Laboratory, Columbus, Ohm TUBULAR AND MACHINE INSTITUTE J. G. Zeratrky, National Rivet & Manufacturing Company, Waupun, Wisconsin U.S. DEPARTMENT OF
26、THE AIR FORCE To be appointed U.S. DEPARTMENT OF THE ARMY M. E. Tay/or, U.S. Army Armament R & D Command, Dover, New Jersey Allen Hefskovitz, Alternate, U.S. Army Armament R & D Command, Dover, New Jersey U.S. DEPARTMENT OF DEFENSE Eli Schwartz, Defense Industrial Supply Center, Philadelphia, Pennsy
27、lvania Lewis Pieninck, Alternate, Defense Industrial Supply Center, Philadelphia, Pennsylvania U.S. DEPARTMENT OF THE NAVY J. R. Ruff, Department of the Navy, Washington, D.C. M. S Ow&. Alternate, Department of the Navy, Philadelphia, Pennsylvania U.S. MACHINE CAP WOOD & TAPPING SCREW BUREAUS S C. A
28、damek, Pheoll Manufacturing Company, Chicago, Illinois R. M. Byme, US. Screw Service Bureaus, New York, New York T. J. Ferry. E. W. Ferry Screw Products Company, Inc., Cleveland, Ohio Caw Gordon, Parker-Kalon, Campbellsville, Kentucky Herman Muenchinger, Continental Screw Company, New Bedford, Massa
29、chusetts K. 0. Ringland, Parker-Kalon Fastener Division, USM Corporation, Campbellsville, Kentucky R. H. Seymour, Reed & Prince Manufacturing Company, Worcester, Massachusetts Louis Zanin, Elco Industries, Inc., Rockford, Illinois Paul Foytho, Alternate, Harvey Hubbel, Inc., Bridgeport, Connecticut
30、INDIVIDUAL COMPANIES R. W. Berroia, The Ohio Nut & Washer Company, Mingo Junction, Ohio . D. Cowlin, Canton, Ohio J. E. aaton, Jr., IBM Corporation, Boulder, Colorado J. J. Naesser, Clark Equipment Company, Battle Creek, Michigan J. F. Tornow, Microdot Incorporated, Troy, Michigan INDIVIDUAL MEMBERS
31、 . R. Carer, Jr., The Allen Manufacturing Company, Hartford, Connecticut C. 0. Franklin, Valley Bolt Company, Marion, Iowa F. E. Graves, Fairfield, Connecticut Jack Trilling, Great Lakes Screw, Chicago, Illinois vi PERSONNEL OF SUBCOMMITTEE NO. 2 - SQUARE AND HEX BOLTS AND NUTS R. R. Qo&ty, Utaim. I
32、nternational Harvester Company, Hinsdale, Illinois R. 8. t?elfoni, Sscremty, Industrial Fasteners Institute, Cleveland, Ohio S C Add, Pheoll Manufacturing Company, Chicago, Illinois A G. Bamtwrt. Federal Screw Works, Detroit, Michigan A R. Breed, The Lamson & Sessions Company, Cleveland, Ohio R. M.
33、Byme, US. Smw SeMce Bureaus, New York. New Yo& Art U-r, Deere & Company, Moline, Illinois W. J. Derner, FMC Corporation, Indianapolis, Indiana 0. A Garrison, Russell, Burdsall& Ward, Inc Rock Falls, Illinois F. E. Graws, Fairfield, Connecticut R. M. Hamis, Bethlehem Steel Corporation, Lebanon, Penns
34、ylvania J. B. Levy. General Electric Company, Schenectady, New York 0. T. Lipari, Bell Telephone Laboratories, Inc, Columbus, Ohio A R. Mechell, Jr., Xerox Corporation, Rochester, New York K. E. Mdbl/ou, SPS Technologies, Jenkintown, Pennsykda J. C McMurray, Russell, Burdsall & Ward Inc., Mentor, Oh
35、io H. G. Muendinwr, Continental Screw Company, New Bedford, Massachusetts J. J. Naesset Clark Equipment Company, Baffle Creek, Michigan J. F. Nm, Ford Motor Company, Dearborn, Michigan K. F. Naylor, Cummius Engine Company, Columbus, Indiana 1. M. park. The Steel Company of Canada, Ltd., Hamilton, On
36、tario, Canada C F. Schaening, General Motors Corporation, Warren, Michigan Lou Smng, Caterpillar Tractor Company, East Peoria, Illinois M. E. Taylor, U.S Army Armament R & D Command, Dover, New Jersey R. P. Trowbridge. General Motors Corporation, Warren, Michigan P. A Vacca, Defense Industrial Suppl
37、y Center, Philadelphia, Pennsylvania F. F. Weingmber, Westinghouse Electric Corporation, Pittsburgh, Pennsylvania 0. 0. Wweler, Armco Steel Corporation, Kansas City. Missouri A Hemkovitz, Alternate. U.S. Army Armament R & D Command, Dover, New Jersey Tony Nebesny, Alternare, FMC Corporation, Indiana
38、polis, Indiana L. Pienindr, Alternate, Defense Industrial Supply Center, Philadelphia, Pennsylvania vii Intentionally left blank CONTENTS Page GeneralData . 1 Tables 1. Dimensions of Slotted Hex Nuts . 4 2. Government Standard Items and Part Numbering System. 8 Appendixes Appendix 1 Slot Gages and G
39、aging For Slotted Nuts. . 5 Appendix 2 Part Numbering System Covering Standard Items For Government Use 6 Intentionally left blank ANSI 818.2.4.3M - 1979 AMERICAN NATIONAL STANDARD METRIC SLOTTED HEX NUTS GENERAL DATA 1. Scope 1.1 This standard covers the complete general and dimensional data for me
40、tric slotted hex nuts recog- nized as American National Standard. 1.2 The inclusion of dimensional data in this stan- dard is not intended to imply that all of the nut sizes in conjunction with the various options described herein are stock items. Purchasers are requested to consult with manufacture
41、rs concerning lists of stock production slotted hex nuts. 1.3 Slotted hex nuts purchased for Government use shall conform to this standard, and additionally to the requirements of Appendix 11. 2. Comparison with IS0 standards 2.1 Slotted hex nuts as covered in this standard have been coordinated to
42、the extent possible with draft IS0 standards. The dimensional differences between this ANSI standard and the IS0 draft standards are very few and relatively minor. None affect the func- tional interchangeability of nuts manufactured to the requirements of either. 2.2 At its meetings in Vama, May 197
43、7, ISO/TC2 studied several technical reports analyzing design con- siderations influencing determination of the best series of width across flats for hex bolts, screws and nuts. A primary technical objective was to achieve a logical ratio between under head (nut) bearing surface area (which determin
44、es the magnitude of the com- pressive stress on the bolted members) and the tensile stress area of the screw thread (which governs the clamping force that can be developed by tightening the fastener). Table 1 lists the sizes selected by ISO/ TC2 to be IS0 standard. M10 nuts with 15 mm width across f
45、lats are currently being produced and used in U.S.A. and many other countries of the world. This size, how- ever, is not an IS0 standard. Unless M10 nuts with 15 mm width across flats are specifically ordered, M10 nuts with 16 mm width across flats shall be furnished. 2.3 Letter symbols designating
46、dimensional charac- teristics are in accord with those used in IS0 stan- dards, except capitals have been used for data process- ing convenience instead of lower case letters used in IS0 standards. 3. Dimensions. All dimensions in this standard are in millimeters, unless otherwise stated. 4. Width A
47、cross Flats 4.1 The width across flats shall be the distance, mea- sured perpendicular to the axis of the nut, between two opposite wrenching flats. 4.2 Regardless of nut material or manufacturing process, no transverse section through the nut be- tween 25 and 75 percent of the actual nut thickness
48、as measured from the bearing surface shall be less than the minimum width across flats specified in Table 1. 4.3 Maximum width across flats shall not be ex- ceeded, except that for milled-from-bar nuts made of non-ferrous materials the specified maximum width across flats may be exceeded to conform
49、with the commercial tolerances of cold finished bar stock material. 4.4 For milled-from-bar nuts, the nominal bar size used shall be the closest commercially available size to, but not greater than, the specified maximum width across flats of the nut. 1 AMERICAN NATIONAL STANDARD METRIC SLOTTED HEX NUTS ANSI 818.2.4.3M-1979 5. Thickness. The nut thickness shall be the overall 9. Countersink. The tapped hole shall be counter- distance, measured parallel to the axis of the nut, sunk on the bearing face and may be countersunk on from the top of the nut to the bearing surface, and the
