1、AMERICAN NATIONAL STANDARD Metric Heavy Hex Bolts ANSI 818.2.3.6M - 1979 REAFFIRMED 1995 Government Key Words: Bolt, Heavy Hex - Metric FOR CURRENT COMMllTEE PERSONNEL PLEASE SEE ASME MANUAL AS1 1 SECRETARIAT SOCIETY OF AUTOMOTIVE ENGINEERS THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS PUBLISHED BY T
2、HE AMERICAN SOCIETY OF MECHANICAL ENGINEERS United Engineering Center 345 East 47th Street New York, N. Y. 1001 7 ANSI 618.2.3.6M-79 26APRlL 1979 ACCEPTANCE NOTICE This non-Government document was adopted on 26 April 1979 and is approved for use by the DoD and Federal Agencies. Metric heavy hex bolt
3、s shall conform to this document and Appendix 111, which establishes standard items for Government application. Appendix 111, Table 4 shall be used for item selec- tion in accordance with the part numbering system and size information contained therein. The indicated industry group has furnished the
4、 clearances required by existing regulations. Copies of the document are stocked by DoD Single Stock Point, Naval Publications and Forms Center, Philadelphia, PA, 19120, for issue to DoD activities and Federal Agencies only. Contractors and industry groups must obtain copies directly from: The Ameri
5、can Society of Mechanical Engineers United Engineering Center, 345 E. 47th Street New York, NY 10017 or The American National Standards Institute 1430 Broadway, New York, NY 10018 Title of Document: Bolt, Heavy Hex - Metric ANSI Document No.: ANSI B18.2.3.6M-1979 Date of Specific Issue Adopted: 26 A
6、pril 1979 Releasing Industry Group: The American Society of Mechanical Engineers Custodians: Army - AR Navy - AS Air Force - 99 Military Coordinating Activity Army - AFT - (Project 5306-0621) . . . ,. Review Activities: User Activities: Army - AV, MI, ER Army - ME, AT Navy - MC Navy - SH NSA - NS DL
7、A - IS Civil Agencies: GSA-FSS NOTICE: When reaffirmation, amendment, revision, or cancellation of this standard is initially proposed, the industry group responsible for this standard shall inform the Military Coordinating Activity of the proposed action and request their participation. I FSC 5305
8、I 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. Date of Issuance: August 31, 1979 Copyright 01979 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A. Int
9、entionally left blank FOREWORD 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
10、Association, then the United States of American 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. Subcommittee 2 was subsequently established a
11、nd charged with the responsibility for technical content of standards 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 m
12、etric hex bolts, screws and nuts. At a meeting on September 22, 1976, Subcommittee 2 urganized the contents of a standard covering eight different hex head screw and bolt products. Actual drafting was postponed until ISO/TC2 could reach final decisions relating to basic dimensions and characteristic
13、s of hex bolts, screws 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 drafting of this standard was started. In February 1978, Committee B18 established a cooperative program with the Department o
14、f Defense to draft 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 eight products be covered in separate standards, and Subcommittee 2 accepted this approa
15、ch at its meeting on June 27,1978. This standard was approved by letter ballot of Committee B18 on September 15, 1978, and was sub- sequently approved by the secretariat and submitted to the American National Standards Institute for designation as an American National Standard. This was granted on A
16、pril 26, 1979. iii AMERICAN NATIONAL STANDARDS COMMITTEE B18 STANDARDIZATION OF BOLTS, NUTS, RIVETS, SCREWS, WASHERS AND SIMILAR FASTENERS OFFICERS R. P. Trowbridge, Chairman J. B. Levy, Vice-chairman H. G. Muenchinger, Vice-chairman Richard McGinnis, Secretary COMMITTEE PERSONNEL AMERICAN CHAIN ASS
17、OCIATION L. E. Hampel, Moline Malleable Iron Company, St. Charles, Illinois AMllRlCAN HARDWARE MANUIACTUKi 125 and 2oo Lengths M12x 1.75 57 44 38 0.6 17.7 7.0 9.68 10.75 29.56 31.18 26.16 27.00 15.30 16.70 M16 x 2 53 D 40 34 0.6 15.7 6.2 8.51 9.25 26.17 27.71 23.16 24.00 13.30 14.70 M14 x 2 49 25 30
18、 0.6 13.7 5.2 7.24 7.95 22.78 24.25 20.16 21.00 11.30 12.70 z M20x 2.5 20.84 19.16 34.00 97 Q, 84 78 1 .o 39.4 15.8 21.72 23.55 66.44 69.28 58.80 60.00 35.00 37.00 M36 x 4 85 72 66 1 .o 33.4 13.1 17.92 19.75 55.37 57.74 49.00 50.00 29.16 30.84 M30x 3.5 73 Po 60 54 0.8 26.4 10.5 14.56 15.90 45.20 47.
19、34 40.00 41.00 23.16 24.84 M24 x 3 65 52 46 0.8 22.4 8.8 12.12 13.40 37.29 39.26 33.00 See Notes 12 8.9 7 8 13 17.3 7 A (D 4 (D AMERICAN NATIONAL STANDARD METRIC HEAVY HEX BOLTS ANSI B18.2.3.6M-1979 Table 2 Dimensions of Reduced Body Diameter Nominal Bolt Dia and Thread Pitch M12x 1.75 M14 x 2 M16 x
20、 2 M24 x 3 M20 x 2.5 I DS I Dsi I LS h Shoulder Shoulder Body Diameter Diameter 6.0 7.0 10.68 10.95 11.30 12.70 Min Max Min Max Min Max Length 14.70 13.30 12.77 12.50 8.0 7.0 16.70 15.30 14.77 14.50 9.0 8.0 20.84 12.0 13.0 21.80 22.1 3 23.16 24.84 1 1 .o 18.16 18.49 19.16 10.0 Note: Shoulder is opti
21、onal. Table 3 Length Tolerances Nominal Length to 50 mm over 50 to 80 mm over 80 to 120 mm over 120 to 180 mm over 180 to 240 mm over 240 mm Nominal Bolt Diameter M12 thru M16 M30 and M36 M20 and M24 1.3 2.0 3.0 1.5 4.0 3.0 1.8 3.5 2.5 2.0 3.5 4.5 4.0 4.0 6.0 5.0 5.0 6.0 All tolerances are plus and
22、minus APPENDIX I BOLT STRAIGHTNESS REFEREE GAGE AND GAGING PROCEDURE The conformance of bolts to shank straightness or camber limitations set forth in the respective product standards shall be checked by using the gage illustrated below in accordance with the following procedure: Allowable total cam
23、ber on the product to be in- spected shall be calculated by multiplying the specified permissible camber per mm of length by the product length expressed as a one place decimal. The total camber thus derived shall be added to the specified maximum body diameter exclusive of allowance for swell or fi
24、n under head and the adjustable rail of gage shall be adjusted to provide a parallel space between the rails equal to this distance by obtaining common readings on both micrometer heads. The adjustable rai! shall then be locked in place by tightening secur- ing screws. The product shall then be inse
25、rted between rails, excluding from the gage any permissible length of swell or fillet under the head. The products shall be rotated by hand through full 360 deg. Any inter- ference occurring between the product and the gage which is sufficient to prevent rotation shall indicate excessive camber. TYP
26、ICAL STRAIGHTNESS GAGE REVERSE READING MICROMETER HEADS SECURING SCREWS 2 TIMES BASIC BOLT 6 APPENDIX II RECOMMENDED CLEARANCE HOLES FOR BOLTS Dh +-+-I- Clearance Holes for Bolts Dh-Clearance Hole Diameter, Basic Nom Bolt Dia and Normal Close Loose Clearance (Preferred) Thread Pitch Clearance M12 x
27、1.75 13.0 18.5 17.5 17.0 M16 x 2 16.5 15.5 15.0 M14 x 2 14.5 13.5 M20 x 2.5 21 .o 22.0 24.0 M24 x 3 25.0 39.0 I 42.0 37.0 M36 x 4 35.0 33.0 31 .O M30 x 3.5 28.0 26.0 Clearance Notes: 1. Normal Clearance. Normal clearance hole sizes are preferred for general purpose applications, and should be specif
28、ied only for applications where maximum adjustment 3. Loose Clearance. Loose clearance hole sizes should be specified unless special design considerations dictate the need capability between components being assembled is necessary. for either a close or loose clearance hoie. 2. Close Clearance. Clos
29、e clearance hole sizes should be ters given in the table are minimum sizes. Recommended 4. Recommended Tolsrances. The clearance hole diame- specified only where conditions such as critical alignment of tolerances are plus 0.3 rnm for bolt diameters M12 thru assembled parts, wall thickness or other
30、limitations necessitate M16; and plus 0.4 mm for bolt diameters M20 thru M36. use of a minimal hole. When close clearance holesare specified, special provision kg., countersinking) must be provided at the bolt entry side to permit proper seating of the bolt head. 7 APPENDIX 111 Government Standard I
31、tems and Part Numbering System Note The Govekent encourages the general use of th& appendix to achieve maximum parts standardization. This appendix establishes the standard items for Government application selected from the possible variations. of items within the scope of the standard - and provide
32、s a part numbering system for identifica- tion and application in engineering documents. The following variations are standard: a. DiameterjThread Pitch and Length Combina- tions-as specified in Table 4. b. Material-Steel, Property Class 10.9. c. Finish-Cadmium plating or zinc plating as coded d. Sp
33、e,cial Features-drilled head or self-locking, as The part number shall consist of the following ele- in Part Numbering System. specified, ment codes in the order shown: a. Document Identifier - ANSI Standard Number less decimal -points b. Material and Finish c. Nominal Diameter d. Nominal Length e.
34、Special Features Note The Part Numbering System may also be used for non-standard diameter and length combinations. Quality Assurance Provisions: Quality assurance provisions shall be in accordance with FF-S-85 Screw, Cap, Slotted and Hexagon Head. Packaging: Packaging shall be in accordance with PP
35、P-H-1581, Hardware (Fasteners and Related Items), Packaging and Packing for Shipment and Storage of. a PART NUMBERING SYSTEM COVERING STANDARD ITEMS FOR GOVERNMENT USE NOTE: THE GOVERNMENT ENCOURAGES THE GENERAL USE OF THIS SYSTEM TO ACHIEVE MAXIMUM PARTS STANDARDIZATION. I I 6 1 8 2 3 6 A MATERIAL
36、AND FINISH CODE A - Steel w/Cadmium Plating per 00-P-416, Type II, Class 3 (0.005 mm Plating Thickness), Property Class 10.9. B - Steel w/Zinc Plating per QQ-2-325, Type 11, Class 3 (0.005 mm Plating Thickness), Property Class 10.9. 1 6 1 8 0 mm mm SPECIAL FEATURE CODE N - NONE D - Drilled Head* L -
37、 Self-Locking* C - Drilled Head and Self-Locking* N EXAMPLE: 618236A16180N indicates a bolt, heavy hex-metric, made of cadmium plated steel, property class 10.9, 16 mm in diameter, 180 mm in length, with no special feature. *Details will be provided when available. Nominal Length 20 25 30 35 40 45 5
38、0 55 60 65 70 75 80 90 100 110 120 130 140 150 160 180 200 220 240 260 300 Table 4 Metric Heavy Hex Bolts-Standard Sizes For Government Use Nominal Diameter and Thread Pitch d12x 1.75 M14x 2 M16x2 M20x2.5 M36x4 M30x3.5 M24x3 FOR SELECTION WITHIN THIS AREA, USE ANSI B18.2.3.3M. METRIC HEAVY HEX HEAD SCREW SELECTION CRITERIA, APPENDIX 111, TABLE 8. 14150 I 16160 201 60 241 60 STANDARD DIAMETER AND LENGTH COMBINATION 12300 14300 16300 20300 24300 36080 30300 36300 10
