1、AMERICAN NATIONAL STANDARD Metric Plain Washers ANSI B18.22M - 1981 Government Key Words: Washer, Flat, Plain - Metric SECRETARIAT SOCIETY OF AUTOMOTIVE ENGINEERS THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS PUBLISHED BY THE AMERICAN SOCIETY Of MECHANICAL ENGINEERS United Engineering Center 345 East
2、 47th Street New York, N.Y. 10017 Date of Issuance: December 15, 1981 This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Consensus Committee that approved the code or standard was balanced to assure that individuals from compe
3、tent and concerned interests have had an opportunity to participate. The proposed code or standard was made available for public review and comment which provides an opportunity for additional public input from industry, academia, regulatory agen- cies, and the public-at-large. ASME does not “approv
4、e,“ “rate,“ or “endorse“ any item, construction, proprietary device, or activity. ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against l
5、iability for infringement of any applicable Letters Patent, nor assume any such liability. Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility. Participation
6、by federal agency representative(s) or perron(s1 affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard. No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permiss
7、ion of the publisher. Copyright 0 1981 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in USA. FOREWORD American National Standards Committee B18 for the standardization of bolts, screws, nuts, rivets, and similar fasteners was organized in March 1922 as Sectional Committ
8、ee B18 under the aegis of the American Engineering Standards Committee (later the American Standards Association, then the United States of America Standards Institute and as of October 6, 1969, the American National Standards Institute, Incorporated), with the Society of Automotive Engineers and th
9、e American Society of Mechanical Engineers as joint sponsors. Subcommittee 22 was subsequently established and charged with the responsibility for technical content of standards covering flat washers. In early 1976, the Subcommittee was directed to develop a new standard for metric general purpose f
10、lat washers. The first draft was based on work done by a 1975176 SAE “ad hoc” washer task force. The SAE objective, and subsequently the Subcommittee 22 objective, was to provide a standard compatible with metric bolt standards and to avoid deficiencies of the existing inch standard which had histor
11、ically fostered specialty washers. Improvements were to include closer ID to bolt shank clearance for maximum bearing area, least number of OD incre- ments in rational proportion to ID, slightly increased thicknesses with minimum tolerance, and defined geometric form variability. IS0 general purpose
12、 flat washer standards and draft standards were carefully reviewed dur- ing the development of this Standard. However, due to differences in philosophy regarding flat washer manufacture and use, very few IS0 recommended sizes could be accommodated. This Standard was approved by letter ballot of Comm
13、ittee B18, with all negatives resolved at the 318 general meeting of May 20, 1981. It was subsequently approved by the secretariat and submitted to the American National Standards Institute for designation as an American National Standkd. This designation was granted on September 2 1,198 1. NOTE The
14、 reprint of 5/98 incorporates corrections specified in an errata sheet issued previously (item number L0063E). Corrections are indicated by 5/98 in the margin. iii Intentionally left blank AMERICAN NATIONAL STANDARDS COMMITTEE B18 STANDARDIZATION OF BOLTS, NUTS, RIVETS, SCREWS, WASHERS, AND SIMILAR
15、FASTENERS OFFICERS J. B. Levy, Chairman H. W. Ellison, Vice-chairman E. Schwartz. Vice-chairman R. McGinnis, Secretary COMMITTEE PERSONNEL AMERICAN CHAIN ASSOCIATION L. E. Hampel, Moiine Malleable Iron Company, St. Charles, Illinois AMERICAN HARDWARE MANUFACTURERS ASSOCIATION Donald Wanek, Wrought W
16、asher Manufacturing Company, Milwaukee, Wisconsin AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS E. R. Friesth, Coal Valley, Illinois AMERICAN SOCIETY OF MECHANICAL ENGINEERS, THE A. R. Machell, Jr., Xerox Corporation, Rochester, New York R. I? Trowbridge, Detroit, Michigan C R. Adams, Alrernute, Newpor
17、t News Shipbuilding nominal washer size; series; material type; and finish, if required, in that order as shown in the following examples: Plain washer, 6 mm, narrow, soft, steel, zinc plated. Plain washer, 6 mm, regular, hardened steel. The Government part numbering system for metric plain washers
18、is given in Appendix I. This sys- tem may be used by any user needing a definitive part numbering system. 3 AMERICAN NATIONAL STANDARD METRIC PLAIN WASHERS ANSI 618.22M-1981 5/98 TABLE 1 DIMENSIONS OF METRIC PLAIN WASHERS (GENERAL PURPOSE) 1.6 2 2.5 3 3.5 4 5 6 8 I A Washer Series Narrow Regular Wid
19、e Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide 2.09 2.09 2.09 2.64 2.64 2.64 3.14 3.1 4 3.14 3.68 3.68 3.68 4.1 8 4.1 8 4.1 8 4.88 4.88 4.88 5.78 5.18 5.18 6.81 6.81 6.87 9.1 2 9.1 2 9.
20、1 2 1.95 1.95 1.95 2.50 2.50 2.50 3.00 3.00 3.00 3.50 3.50 3.50 4.00 4.00 4.00 4.70 4.70 4.70 5.60 5.60 5.60 6.65 6.65 6.65 8.90 8.90 8.90 f B Outside Diameter Ma 4.00 5.00 6.00 5.00 6.00 8.00 6.00 8.00 10.00 7.00 10.00 12.00 9.00 10.00 15.00 10.00 12.00 16.00 11.00 15.00 20.00 13.00 18.80 25.40 18.
21、80 25.40 32.00 Min 3.70 4.70 5.10 4.10 5.10 1.64 5.70 7.64 9.64 6.64 9.64 11.57 8.64 9.64 14.5 7 9.64 11.57 15.57 10.57 14.51 19.48 12.57 18.28 24.88 18.28 24.88 31.38 C Thickness MZlX 0.70 0.10 0.90 0.90 0.90 0.90 0.90 0.90 1.20 0.90 1.20 1.40 1.20 1.40 1.75 1.20 1.40 2.30 1.40 1.75 2.30 1.75 1.75
22、2.30 2.30 2.30 2.80 Min 0.50 0.50 0.60 0.60 0.60 0.60 0.60 0.60 0.80 0.60 0.80 1 .oo 0.80 1 .oo 1.20 0.80 1 .oo 1.60 1 .oo 1.20 1.60 1.20 1.20 1.60 1.60 1.60 2.00 4 AMERICAN NATIONAL STANDARD METRIC PLAIN WASHERS ANSI 618.22M-1981 TABLE 1 (CONTD) DIMENSIONS OF METRIC PLAIN WASHERS (GENERAL PURPOSE)
23、Nominal Washer Size(1) 10 12 14 16 20 24 30 36 Washer Series Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide c t A Inside Diameter Max(2) 11.12 11.12 11.12 13.57 13.57 13.57 15.52 15.52 15
24、.52 17.52 17.52 17.68 22.1 3 22.32 22.32 26.1 2 26.1 2 26.1 2 33.02 33.02 33.02 38.92 38.92 38.92 Min(3) 10.85 10.85 10.85 13.30 13.30 13.30 15.25 15.25 15.25 17.25 17.25 17.25 21.80 21.80 21.80 25.60 25.60 25.60 32.40 32.40 32.40 38.30 38.30 38.30 1 B I C Max 20.00 28.00 39.00 25.40 34.00 44.00 28.
25、00 39.00 50.00 32.00 44.00 56.00 39.00 50.00 66.00 44.00 56.00 72.00 56.00 72.00 90.00 66.00 90.00 11 0.00 Min Max 19.48 27.48 38.38 24.88 33.38 43.38 27.48 38.38 49.38 31.38 43.38 54.80 38.38 49.00 64.80 43.00 54.80 70.80 54.80 70.80 88.60 64.80 88.60 2.30 2.80 3.50 2.80 3.50 3.50 2.80 3.50 4.00 3.
26、50 4.00 4.60 4.00 4.60 5.1 0 4.60 5.10 5.60 5.1 0 5.60 6.40 5.60 6.40 108.60 1 8.50 NOTES: (1 ) Nominal washer sizes are intended for use with comparable nominal screw or bolt sizes. (2) See 4.2 for maximum permissible I.D. at the punch exit side. (3) See 4.1 for closeness of fit with coated or plat
27、ed products. (4) The 18.80118.28 and 25.40/24.88 mm outside diameters avoid washers which could be used in coin operated devices. Min 1.60 2.00 2.50 2.00 2.50 2.50 2.00 2.50 3 .OO 2.50 3.00 3.50 3.00 3.50 4.00 3.50 4.00 4.50 4.00 4.50 5.00 4.50 5.00 7.00 5/98 5 Intentionally left blank APPENDIX I PA
28、RT NUMBERING SYSTEM COVERING STANDARD ITEMS FOR GOVERNMENT USE Note The Government encourages the general use of this appendix to achieve maximum parts standardization. This appendix establishes the standard items for Government application selected from the possible variations of items within the s
29、cope of the standard and provides a part numbering system for identifica- tion and application in engineering documents. The following variations are standard: a. Nominal Washer Size - as specified in Table 2. b. Material-Steel-soft (non-hardened) or hardened as coded in Part Numbering System. c. Fi
30、nish-Cadmium plating, zinc plating or plain d. Washer Series Code-narrow, regular or wide finish as coded in Part Numbering System. as coded in Part Numbering System. The part number shall consist of the following ele- ment codes in the order shown: a. Document Identifier - ANSI Standard Number less
31、 decimal points b. Material and Finish c. Washer Type d. Nominal Size e. Washer Series Quality Assurance Provisions: Quality assurance provisions shall be in accordance with FF-W-92, Washer, Flat (Plain), except that for type H, a hard- ness test shall be made at a minimum of 2 locations 180 deg. ap
32、art on one face. Packaging: Packaging shall be in accordance with PPP-H-158 1, Hardware (Fasteners and Related Items), Packaging and Packing for Shipment and Storage of. 7 APPENDIX I (CONT.) PART NUMBERING SYSTEM COVERING STANDARD ITEMS FOR GOVERNMENT USE NOTE: THE GOVERNMENT ENCOURAGES THE GENERAL
33、USE OF THIS SYSTEM TO ACHIEVE MAXIMUM PARTS STANDARDIZATION B 1822 A S 160 lOths of MM MATERIAL AND FINISH CODE A - Steel w/Cadmium Plating per 00-P-416, Type 11, CIm 3 (6.1 um Plating Thickness). B - Steel w/Zinc Plating per QQ-2-325, Type 11, sire and smeller end Class 2 (13 um Plating Class 3 (6.
34、1 Hm Plating Thickness) for 6 mm Thickness) for sizes larger than 6 mm. C - Steel w/Hot Dip Galvanized Coating per ASTM A153 Grade C. P - Steel. No Finish. TYPE CODE s - Soft H - Hardened WASHER SERIES CODE N - Narrow R - Regular W - Wide iXAMPLE: 81822ASlWR indicates a Washer, Flat, Plain-Metric, m
35、ade of cadmium plated, non-hardened steel, 16 mm nominal size, regular series. TABLE 2 GOVERNMENT STANDARD ITEMS Nominal Washer Equivalent Washer Series Size Part Number Per Table 1 K 1.6 016 R* W N 2 020 R* W N 2.5 025 R* W N 3 030 R* W N 3.5 035 R* W N 4 040 R* W N 5 050 R* W N 6 060 R* W N 8 080 R* W N 10 100 R* W N 12 120 R* W N 14 140 R* W N 16 160 R* W N W N 20 200 R* 24 240 R* W N 30 300 R* W N 36 360 R* W *R series preferred 9 Intentionally left blank Intentionally left blank L00063
