1、ANSI 818.2.3.6M-79 26 APRIL 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 bolts shall conform to this document and Appendix III. which establishes standard items for Government application. A
2、ppendix III, 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 clearances required by existing regulations. Copies of the document are stocked by DoD Single Stock Point, Naval
3、 Publications and Forms Center, Philadelphia, PA, 19120, for issue to DoD activities and directly from: Federal Agencies only. Contractors and industry groups must obtain copies The American Society of Mechanical Engineers United Engineering Center, 345 E. 47th Street New York, NY 10017 or The Ameri
4、can National Standards Institute 1430 Broadway, New York, NY 10018 Title of Document: .f Bolt, Heavy Hex - Metric ANSI Document No.: ANSI B18.2.3.6M-1979 Date of Specific Issue Adopted: 26 April 1979 Releasing Industry Group: The American Society of Mechanical Engineers Custodians: Army - AR Navy -
5、AS Air Force - 99 Military Coordinating Activity Army - AR (Project 5306-06:! 1) Review Activities: User Activities: Army - AV, hlI, ER Army - ME, AT Naky - MC Navy - SH DLA - IS NSA - NS Civil Agencies: GSA-FSS NOTICE: When reaffirmation, amendment, revision, or cancellation of this standard is ini
6、tially proposed, the industry group responsible for this standard shall inform the Military Coordinating Activity of the proposed action and request their participation. No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written
7、permission of the publisher. Date of Issuance: August 31, 1979 Copyright 01979 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved THIS DOCUMENT CONTAINS PAGES. Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted w
8、ithout license from IHS-,-ERRATA to ANSI B18.2.3.6M-1979 METRIC HEAVY HEX BOLTS Page 2, Note 18, change B l. 1 3 to read B l. 1 3M Page 9, 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. 10017 April
9、1981 -. f Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMERICAN NATIONAL STANDARD Metric Heavy Hex Bolts ANSI B18.2.3.6M - 1979 Government Key Words: Bolt, Heavy Hex - Metric SECRETARIAT SOCIETY O
10、F AUTOMOTIVE ENGINEERS THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS PUBLISHED BY THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS United Engineering Center 345 East 47th Street New York, N. Y. 1 O01 7 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or ne
11、tworking permitted without license from IHS-,-ASME BLB*2.3.6M 77 M 0757670 0043325 O W ANSI B18.2.3.6M-79 26 APRIL 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 bolts shall conform to this do
12、cument and Appendix III, which establishes standard items for Government application. Appendix III, 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 clearances required by ex
13、isting 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 American Society of Mechanica
14、l Engineers United Engineering Center, 345 E. 47th Street New York, NY 10017 or The American National Standards Institute 1430 Broadway,NewYork, NY 10018 Title of Document: Bolt, Heavy Hex - Metric ANSI Document No.: ANSI B18.2.3.6M-1979 Date of Specific Issue Adopted: Releasing Industry Group: Cust
15、odians: Army - AR Navy - AS Air Force - 99 26 April 1979 The American Society of Mechanical Engineers Military Coordinating Army - AR (Project 5306-0621) Review Activities: User Activities: Army - AV, MI, ER Amy - ME, AT Navy - MC Navy - SH NSA -.NS DLA - IS Civil Agencies: GSA-FSS NOTICE: When reaf
16、firmation, amendment, revision, or cancellation of this the industry group responsible for this standard shall inform the Military proposed action and request their participation. Activity standard is initially proposed, Coordinating Activity of the piZiZ1 No part of this document may be reproduced
17、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 1979 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A. Copyright ASME International Provided by IHS under
18、 license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-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 o
19、f the American Engineering Standards Committee (later the American Standards 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 Mechanic
20、al Engineers as joint sponsors. Subcommittee 2 was subsequently established and 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 fastene
21、rs. Subcommittee 2 was assigned responsibility for developing standards for metric hex bolts, screws and nuts. At a meeting on September 22, 1976, Subcommittee 2 clrganized the contents of a standard covering eight different hex head screw and bolt products. Actual drafting was postponed until ISOIT
22、C2 could reach final decisions relating to basic dimensions and characteristics 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 Februa
23、ry 1978, Committee B18 established a cooperative program with the Department of 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 prod
24、ucts be covered in separate standards, and Subcommittee 2 accepted this approach 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 Ins
25、titute for designation as an American National Standard. This was granted on April 26, 1979. iii :“ Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMERICAN NATIONAL STANDARDS COMMITTEE B18 STANDARDI
26、ZATION OF BOLTS, NUTS, RIVETS, SCREWS, WASHERS AND SIMILAR FASTENERS OFFICERS R. P. Trowbrdge, Chairman J. B. Levy, Vice-chairman H. G. Muenchnger, vice-chairman Richard McGinnis, Secretary COMMITTEE PERSONNEL AMLtRICAN CHAIN ASSOCIATION L. E. Hampel, Moline Malleable Iron Company, St. Charles, Illi
27、nois AMKRICAN HARDWARI: MANUbACTURERS ASSOCIATION Donald Wanek, Wrought Washer Manufacturing Company, Milwaukee, Wisconsin AMI 125 end Lengths 200 Pitch Max Min Max Min Max Min Max Min Min Max Min Q 200 Ml2 x 1.75 12.70 11.30 21.00 20.16 24.25 22.78 7.95 7.24 5.2 13.7 0.6 30 36 49 M14x2 14.70 13.30
28、24.00 23.16 27.71 26.17 9.25 8.51 6.2 15.7 0.6 34 40 53 M16x2 16.70 15.30 27.00 26.16 31.18 29.56 10.75 9.68 7.0 17.7 0.6 38 44 57 3 52 M20 x 2.5 20.84 19.16 34.00 33.00 39.26 37.29 13.40 12.12 8.8 22.4 0.8 46 52 65 y M24x3 24.84 23.16 41.00 40.00 47.34 45.20 15.90 14.56 10.5 26.4 0.8 54 60 73 g PA3
29、0 x 3.5 30.84 29.16 50.00 49.00 57.74 55.37 19.75 17.92 13.1 33.4 1.0 66 72 85 w M36x4 37.00 35.00 60.00 58.80 69.28 66.44 23.55 21.72 15.8 39.4 1.0 78 84 97 2 See Notes 12 8.9 7 8 13 17.3 2 s CD Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or net
30、working permitted without license from IHS-,-ASME B18.2.3.bM 77 Bs 0757670 OOq3135 3 AMERICAN NATIONAL STANDARD METRIC HEAVY HEX BOLTS ANSI B18.2.3.6M-1979 Table 2 Dimensions of Reduced Body Diameter Nominal Thread Bolt Dia Lsh Dsi Ds Shoulder Diameter Length Diameter and . Pitch 7.0 8.0 12.50 12.77
31、 13.30 14.70 M14 x 2 6.0 7.0 10.68 10.95 11.30 12.70 M12x 1.75 Min Max Min Max Min Max M16 x 2 16.70 15.30 14.77 14.50 12.0 13.0 21.80 22.1 3 23.16 24.84 M24 x 3 10.0 11.0 18.16 18.49 19.16 20.84 M20 x 2.5 8.0 9.0 Body Shoulder Note: Shoulder is optional. Table 3 Length Tolerances Nominal Length to
32、50 mm over 50 to 80 mm over 80 to 120 mm I Nominal Bolt Diameter 1.8 3.0 4.0 over 120 to 180 mm 6.0 5.0 5.0 over 240 mm . 6.0 4.0 4.0 over 180 to 240 mm 4.5 3.5 2.0 All tolerances are plus and minus 5 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction o
33、r networking permitted without license from IHS-,-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
34、the following procedure: Allowable total camber 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 dia
35、meter exclusive of allowance for swell or fin 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 rail shall then be locked in place by tightening secur
36、- ing screws. The product shall then be inserted 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 r
37、otation shall indicate excessive camber. RAIL TYPICAL STRAIGHTNESS GAGE 7 ADJUSTABLE REVERSE READING MICROMETER HEADS 7 ,r SECURING SCREWS 2 TIMES BASIC BOLT DIAMETER 6 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without l
38、icense from IHS-,-iASNE B18-2-3-bH 77 HU 075.7b-70 0043137 7 m APPENDIX II RECOMMENDED CLEARANCE HOLES FOR BOLTS Dh t-+-I- Clearance Holes for Bolts Dh-Clearance Hole Diameter, Basic Normal Clearance Nom Bolt Dia and . - Close Loose Thread Pitch Clearance (Preferrd, Clearance M12 x 1.75 13.0 18.5 17
39、.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 42.0 39.0 37.0 M36 x 4 35.0 33.0 31 .O M30 x 3.5 28.0 26.0 Notes: preferred for general purpose applications, and should be 1. Normal Clearance. Normal clearance hole sizes are specified unless special design con
40、siderations dictate the need for either a close or loose clearance hole. 2. Close Clearance. Close clearance hole sizes should be specified only where conditions such as critical alignment of assembled parts, wall thickness or other limitations necessitate use of a minimal hole. When close clearance
41、 holes arespecified, special provision (e.g., countersinking) must be provided at the bolt entry side tc permit proper seating of the bolt head. specified only for applications where maximum adjustment 3. Loose Clearance. Loose clearance hole sizes should be capability between components being assem
42、bled is necessary. 4. Recommended Tolarances. The clearance hole diame- ters given in the table are minimum sizes. Recommended tolerances are plus 0.3 mm for bolt diameters M12 thru M16; and plus 0.4 mm for boltdizmeters M20 thru M36. 7 Copyright ASME International Provided by IHS under license with
43、 ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-APPENDIX t41 Government Standard Items and Part bJumbermg Note . The Government encourages the general use of thisappendix to achieve maximum parts standardization. This appendix establishes the standard items for
44、Government application selected from the possible variations of items within the scope of the standard and. provides a part numbering system for identifica- - tion and application in engineering documents. The following variations are standard: . a. Diameter/Thread Pitch and Length Combina- tions-as
45、 specified in Table 4. b. Material-Steel, Property Class 10.9. c. Finish-Cadmium plating or zinc plating as coded d. Special Featwes-drilled head or self-locking, as in Part Numbering System. specified. a. Document Identifier - ANSI Standard Number b. Material and Finish less decimal points c. Nomin
46、al Diameter d. Nominal Length e. Special Features Note The Part Numbering System may also be used for .non-standard diameter and length combinations. b Quality AburanCe Provisions: Quality assurance provisions shall be in accordance with FF-S-85 Screw, Cap, Slotted and Hexagon Head. -Packaging: Pack
47、aging shall be in accordance with The part number shall consist of the following ele- PPP-H-1581, Hardware (Fasteners and Related Items), ment codes in the order shown: Packaging and Packing for Shipment and Storage of. 8 “ . Copyright ASME International Provided by IHS under license with ASMENot fo
48、r ResaleNo reproduction or networking permitted without license from IHS-,-PART NUMBERING SYSTEM COVERING STANDARD ITEMS FOR GOVERNMENT USE NOTE: THE GOVERNMENT ENCOURAGES THE GENERAL USE OF THIS SYSTEM TO ACHIEVE MAXIMUM PARTS STANDARDIZATION. B 1 8 2 3 6 A 1 6 mm 1 8 0 mm MATERIAL AND FINISH CODE
49、A - Steel w/Cadmium Plating per QQ-P-416, Type II, Class 3 (0.005 mm Plating Thickness), Property Class 10.9. B - Steel w/Zinc Plating per QQ-f-325, Type II, Class 3 (0.005 mm Plating Thickness), Property Class 10.9. SPECIAL FEATURE CODE N - NONE D- Drilled Head* L - Self-Locking* C - Drilled Head and Self-Lockinf N I 1. EXAMPLE: BlB236A16180N indicates a bolt, heavy hex-metric, made o
