1、25 February 1987 SUPERSEDING ANSI B18.3.3M- 1979 18 July 1979 ACCEPTANCE NOTICE This non-Government document was adopted on 25 February 1987, and is approved for use by the DoD. clearance required by existing regulations. Copies of the document are stocked by the DoD Single Stock Point, Naval Public
2、ations and Forms Center, Philadelphia, PA 19120-5099, for issue to DoD activities only. Contractors and Industry groups must obtain copies directly from: The American Society of Mechanical Engineers United Engineering Center, 345 E. 47th Street New York, NY 10017 or The American National Standards I
3、nstitute, 1430 Broadway, New York, NY 10018. The indicated industry group has furnished the Title of Document: Screw, ShoJPder,Hexagon Socket Head-Metric Series Document Number : ASME/ANSI B18.3.3M-1986 Date of Specific Issue Adopted : 19 September 1986 Releasing Industry Group: The American Society
4、 of Mechanical Engineers 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 change and request participation. Cus tod ians : Army - A
5、R Navy - AS Air Force - 99 Review Activities: Army - AV, ER,MI NSA - NS DU - IS Navy - MC User Activities: Army - AT,ME Navy - OS, Civil Agency GSA - FSS AMSC N/A DISTRIBUTION - - /- - SH Coordinating Activities: Military Coordinating Activity: Army - AR Project Number 5305-1673 _ -_ - -. THIS DOCUM
6、ENT CONTAINS PAGES. - - -, p-p-=-_-p _ STATEMENT A. Approved for public release; distribution is unlimited. _- - - e Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-ASME BLB.3.3M 8-6 Wi 0759b70 0043L
7、150 O m D -2s - I / AN AMERICAN NATIONAL STANDARD Hexagon Socket Head Shoulder Screws (Metric Series) ASMEIANSI BI 8.3.3M-1986 (REVISION OF ANSI BI 8.3.3M-1979) Government Key Words: Screw, Shoulder, Hexagon Socket Head - Metric SPONSORED AND PUBLISHED BY THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS
8、 United Engineering Center New York, N. Y. 1 O0 17 345 East 47th Street Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-Date of Issuance: February 28, 1987 This Standard will be revised when the Soci
9、ety approves the issuance of a new edition. There will be no addenda or written interpretations of the requirements of this Standard issued to this Edition. This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Consensus Committe
10、e that approved the code or standard was balanced to assure that individuals from competent 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 in
11、dustry, academia, regulatory agencies, and the public-at-large. ASME does not “approve,“ “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
12、this document, and does not undertake to insure anyone utilizing a standard against liability 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
13、 of infringement of such rights, is entirely their own responsibility. Participation by federal agency representatives) or person(s) affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard. ASME accepts responsibility for only those interpreta
14、tions issued in accordance with governing ASME procedures and policies which preclude the issuance of interpretations by individual volunteers. 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 publishe
15、r. Copyright O 1987 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A. Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-ASME B1A-3n3M Ab E 075b70 0043452. 4 Ips, FOR
16、EWORD (This Foreword is not part of ASME/ANSI B18.3.3M-1986.) American National Standards Committee B18 for the standardization of bolts, screws, nuts, rivets, and similar fasteners was organized in March 1922 as Sectional Committee B 18 under the aegis of the American Engineering Standards Committe
17、e (later the American Standards Association, then the United States of America Standards Institute and, as of October 6, 1969, the American National Standards Institute) with the Society of Automo- tive Engineers and the American Society of Mechanical Engineers as joint sponsors. Subcommittee 9 was
18、established in April of 1929 to undertake development and oversee maintenance of standards covering socket head cap screws and set screws. In line witha gen- eral realignment of the subcommittee structure on April 1 , 1966, Subcommittee 9 was redes- ignated Subcommittee 3. Over the intervening years
19、 this activity has produced several ver- sions of American National Standards covering inch series socket cap, shoulder, and set screws bearing the B18.3 designation. At the December 4,1974 meeting of American National Standards Committee B18, Sub- committee 3 was assigned the task of preparing stan
20、dards for metric series socket screw products paralleling that contained in the latest ANSI B18.3 document. The Subcommittee was also instructed to continue coordination with the International Standards Organiza- tion, IS0 Technical Committee 2, and Working Group 3 under that activity and, to the ex
21、- tent possible, keep the proposals for metric standards under development in conformance with agreements reached therein. Subsequent meetings of Subcommittee 3 held in February 1975 and January 1976 re- sulted in general agreement on the following basic principles to be considered in developing the
22、 metric version of the standard. (a) To assure consumers continuity of performance integrity consistent with inch socket screw products, the metric standards should maintain the same quality levels as their inch counterparts. (b) To facilitate and expedite theprocessing, acceptance, and adoption of
23、the metricver- sions, proposals for the various product categories should be prepared as separate and com- plete product standards. (c) To promote understanding and assimilation during the transition to metric, the di- mensional symbols, designations, terminology, and basic formats of the metric sta
24、ndards should be kept similar to those used in the ANSI BL8.3 document. At the November 10, 1976 meeting of Subcommitte 3, it was agreed that the socket screw industry document covering metric hexagon socket head shoulder screws should be circu- lated for subcommittee consideration as a proposed sta
25、ndard. It was noted that the dimen- sional characteristics were similar to proposals prepared by Working Group 3 of IS0 TC2, the major difference being in the thread fit. The IS0 proposal specifies tolerance class 5g6g, whereas the socket screw industry document calls for tolerance class 4g6g in lin
26、e with past practice. Subcommittee acceptance of the content ensued and the document, modified to suit the ANSI format, was approved by letter ballot to American National Standards Com- mittee B18. Following its approval by the sponsor organizations, the proposal was submit- ted to the American Nati
27、onal Standards Institute and granted recognition as an American National Standard on July 18, 1979. iii Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-1 ASIE B18*3-3M 86 0759670 0043LI53 b W A perio
28、dic review of the standard, undertaken by the Subcommittee in 1985, resulted in agreement that the document should be revised to include values of the shoulder neck fillet radius for metric hexagon socket head shoulder screws, and to incorporate by reference the ASME standards for screw thread accep
29、tability and the ASTM standard for hardness testing. A proposal containing these changes, as well as editorial corrections, was prepared and balloted by letter ballot to ASME Committee B18. Following approval by ASME, the proposal was submitted to the American National Standards Institute and design
30、ated an American National Standard on September 19, 1986. iv Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-ASME STANDARDS COMMITTEE BI8 Standardization of Bolts, Nuts, Rivets, Screws, Washers, and
31、Similar Fasteners (The following is the roster of the Committee at the time of approval of thisstandard.) OFFICERS J. B. Levy, Chairman H. W. Ellison, Vice Chairman E. Schwartz, Vice Chairman R. W. McGinnis, Secretary COMMITTEE PERSONNEL AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS E. R. Friesth, Don
32、E. Williams Co., Rock Island, Illinois AMERICAN SOCIETY OF MECHANICAL ENGINEERS A. R. Machell, Webster, New York K. E. McCullough, SPS Technologies lnc., Jenkintown, Pennsylvania ENGINE MANUFACTURERS ASSOCIATION G. A. Russ, Curnmins Engine Co., Columbus, Indiana FARM (b) Nominal size (shoulder diame
33、ter) of screw; (c) Nominal screw (shoulder) length, preceded (6) Product name. If desired, the product name may be abbreviated SHSS. (e) Material and property class. For alloy steel screws the material and property class shall be omitted. by x; cf) Protective finish, if required. Examples: B18.3.3M
34、- 8 x 25 Socket Head Shoulder Screw Number 1.7 Part Numbering System tem, one is suggested in Appendix II. For users who need a definitive part numbering sys- 2 DIMENSIONAL CHARACTERISTICS The following requirements supplement the dimen- sional data presented in Tables 1 and 2 and shall apply to the
35、 respective features of screws. Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-ASME/ANSI BI 8.3.3M-1986 M Head Fillet Extension Diameter Max. 7.5 9.2 11.2 15.2 18.2 22.4 27.4 2.1.5 rA1 Shoulder Neck
36、 Fillet Radius Min. .2 .4 .4 -6 .6 .8 .a 2.1.5 HEXAGON SOCKET HEAD SHOULDER SCREWS (METRIC SERIES) Nominal 1 H t-L S r See detail Y D A H S J T I l 1 I I (Para. 2.1 .I) + (Para. 2.6) 1 Screw or Basic Shoulder Diameter Diameter TABLE 1 DIMENSIONS OF METRIC HEXAGON SOCKET HEAD SHOULDER SCREWS Chamfer
37、Hexagon Key Head or Socket Engage- Height Radius Size ment Min. 4.32 5.32 6.78 8.78 10.73 13.73 15.73 Max. Nom. Min. 0.6 3 2.4 0.8 4 3.3 1.0 5 4.2 1.2 6 4.9 1.6 8 6.6 2.0 10 8.8 2.4 12 10.0 Diameter 6.5 8.0 10.0 13.0 16.0 20.0 25.0 See Para. Max. 6.487 7.987 9.987 12.984 15.984 19.980 24.980 2.3.1 2
38、.1.2 2.1.1 2.2.1 2.2.2 Min. Max. 6.451 10.00 7.951 13.00 9.951 16.00 12.941 18.00 15.941 24.00 19.928 30.00 I 24.928 36.00 2.1 Heads 2.1 .I Top of Head. The top of head, excluding socket, shall be flat and chamfered or rounded at the periphery. The length of the chamfer or the corner ra- dius shall
39、not exceed the values for S listed in Table 1. 2.1.2 Head Diameter. The sides of head may be plain or knurled at the option of the manufacturer, unless specified otherwise by the purchaser. 2.1.3 Head Concentricity. The head shall be con- centric with the screw shoulder within 2% of the nomi- nal sc
40、rew diameter or 0.15 mm full indicator movement (FIM), whichever is greater. 2.1.4 Bearing Surface. The plane of the bearing surface of the head shall be perpendicular to the axis of the shoulder within a maximum deviation of 2 deg. 2.1.5 Underhead Fillet. At the option of the manu- facturer, screws
41、 may be necked under the head as de- - picted in Detail Y within the limits of the F, R, and K dimensions given in Table 1, The transition diameter over fillet at the intersection of the bearing surface of the head with the neck or shoulder shall be within the tabulated value for M. 2.2 Sockets 2.2.
42、1 Socket Size. Sockets shall be nominal size J specified in Table 1 for the respective screw sizes and shall conform to the dimensions given in Table 2, as determined by gaging in accordance with para. 2.2.3. 2.2.2 Key Engagement. The key engagement depth shall conform to the minimum values specifie
43、d for Tin Table 1, as determined by gaging in accord- ance with para. 2.2.3. 2.2.3 Socket Gaging. Acceptability of sockets shall be determined by the use of the hexagon socket gages specified in Table 3. The hexagon sockets shall Copyright ASME International Provided by IHS under license with ASMENo
44、t for ResaleNo reproduction or networking permitted without license from IHS-,-Nominal Sew Size 01 Basic Shoulder Diameter 6.5 8.0 10.0 13.0 16.0 20.0 25.0 K F Dl Shoulder Shoulder bminal Diameter Width or Basic Thread Min. Max. Diameter 5.92 2.5 5 7.42 2.5 6 9.42 2.5 8 12.42 2.5 10 15.42 2.5 12 19.
45、42 2.5 16 24.42 3.0 20 Neck Neck Thread Size ASME BLB*393M Bb 0759670 0043459 7 W HEXAGON SOCKET HEAD SHOULDER SCREWS (METRIC SERIES) ASME/ANSI B18.3.3M-1986 . -+ _. This diam. not to exceed major diam. of thread Enlarged Detail Y (Para. 2.1.5) Enlarged Detail 2 (Para. 2.4) TABLE 1 DIMENSIONS OF MET
46、RIC HEXAGON SOCKET HEAD SHOULDER SCREWS (CONTDI I I I Thread Neck Fillet Thread Width Radius Length Thread Pitch Min. 13.25 22.40 27.40 0.8 1 1.25 1.5 1.75 2 2.5 3.0 0.93 4.0 1 .O3 4.8 1.30 5.6 1.46 See Para. I 2.1.5 I 2.5 I 2.4 I 2.4 I 2.5.4 GENERAL NOTE: For additional requirements refer to Sectio
47、ns 2 and 3. TABLE 2 DIMENSIONS OF METRIC HEXAGON SOCKETS allow the GO member of the gage to enter freely to the minimum key engagement depth. The NOT GO gage member shall be permitted to enter only to a depth equivalent to 7.5% of the nominal socket size. To determine the acceptability of sockets in
48、 plated products after plating, a GO gage identical in design and tolerances to that shown in Table 3, except having a maximum width across flats dimension equal to the nominal socket size, shall be used. 2.2.4 Edge of Socket. The edge at the junction of the socket with the top of the head may be br
49、oken (rounded or chamfered) as depicted in Fig. 3, provid- ing the depth of chamfer or rounding does not violate the NOT GO gage penetration limit specified in para. 2.2.3. 3 J C Socket Width Across Flats Socket W-idth Across Corners Nominal Socket Size Min. Min. 3.44 4.58 5.72 3 4 5 6 8 10 12 3.071 4.084 5.084 6.095 8.115 10.127 12.146 3.020- 4.020 5.020 6.020 8.025 10.025 12.032 6.86 9.1 5 11.50 13.80 Copyright ASME Intern
