1、ASME/ANSI B18.3.4M-1986 o -i7433 26 February 1987 SUPERSEDING ANSI B18.3.4M-1979 9 August 1979 - i - ACCEPTANCE NOTICE This non-Government document was adopted on 26 February 1987, and is approved for use by the DoD. the clearance required by existing regulations. Copies of the document are stocked
2、by the DoD Single Stock Point, Naval Publications and Forms Center, Philadelphia, PA 19120-5099, for issue to DoD activities only. Contractors and Industry groups must obtain copies directly from: American Society-of Mechanical Engineers United Engineering Center, 345 E. 47th Street, New York, NY 10
3、017 or The American National Stand- ards Institute, 1430 Broadway, New York, NY 10018. The indicated industry group has furnished The Title of Document: Screw, Cap, Hexagon Socket Button Head-Metric Document Number : AMSMEIANSI B18.3.4M-1986 Date of Specific Issue Adopted: 12 September 1986 Releasin
4、g Industry Group: The American Society of Mechanical Engineers NOTCE: When reaffirmation, amendment, revision, or cancellation of this standard is initially proposed, the industry group responsible ?or this standard shall inform the military coordinating activity of the proposed change and request p
5、articipation. Custodians: Army - AR Navy - AS Air Force - 99 Review Activities: Army - AV, ER, MI Navy - MC NSA - NS DLA - IS User Activities: Navy - OS, SH Amy - AT, ME Military Coordinating Activity: Army - AR (Project 5305-1674) Civil Agency GSA - FSS Coordinating Ac tivi ties : AMSC NIA DISTRIBU
6、TION STATEMENT A. Approved for public release; distribution is unlimited. 1-1 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-AN AMERICAN NATIONAL STANDARD Hexagon Socket Button Head Cap Screws (Metr
7、ic Series) ASME/ANSI B18.3.4M - 1986 (REVISION OF ANSI B18.3.4M-1979) Government Key Words: Screw, Cap, Hexagon Socket Button Head - Metric SPONSORED AND PUBLISHED BY THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS United Engineering Center . 345 East 47th Street New York, N. Y. 1 O01 7 Copyright ASME
8、International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-Date of Issuance: February 15, 1986 This Standard will be revised when the Society approves the issuance of a new edition. There will be no addenda or written interpr
9、etations 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 Committee that approved the code or standard was balanced to assure that individuals from compe
10、tent and concerned interests have had an oppor- tunity 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, reg- ulatory agencies, and the public-at-large. ASME does not.“appr
11、ove,“ “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
12、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 of infringement of such rights, is entirely their own responsibility. Participation
13、 by federal agency representative(s) 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 interpretations issued in accordance with governing ASME procedures and policies which preclu
14、de the issuance of interpretations by individual vol- unteers. 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. Copyright 01987 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Res
15、ewed 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-,-FOREWORD (This Foreword is not part of ASME/ANSI B18.3.4M-1986.) American National Standards Committee B18 for the standardizati
16、on 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 Association, then the United States of America Standards Institufe and, as of October 6, 1969
17、, the American National Standards Institute, Inc.), with the Society of Automotive Engineers and the American Society of Mechanical Engineers as joint sponsors. Subcommittee No. 9 was established in April of 1929 to undertake develoment and oversee maintenance of standards covering Socket Head Cap S
18、crews and Set Screws. In line with a general realignment of the subcommittee structure on April 1, 1966, Subcommittee 9 was redesignated Subcommittee 3. Over the intervening years this activity has produced several versions of American National Standards covering inch series socket cap, shoulder, an
19、d 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 for metric series socket screw products par- alleling that contained in the latest ANSI B18.3 document. The subcommittee was a
20、lso in- structed to continue coordination with the International Standards Organization, IS0 Technical Committee 2 and Working Group 3 under that activity, and to the extent possible keep the proposals for metric standards under development in conformance with agreements reached therein. Subsequent
21、meetings of Subcommittee 3 held in February 1975 and January 1976 resulted in general agreement on the following basic principles to be considered in developing the metric version of the standard: (a) to assure consumers continuity of performance integrity consistent with inch socket screw products,
22、 the metric standards should maintain the same quality levels as their inch counterparts ; (b) to facilitate and expedite the processing, acceptance, and adoption of the metric ver- sions, proposals for the various product categories should be prepared as separate and complete product standards; (c)
23、 to promote understanding and assimilation during the transition to metric, the dimen- sional symbols, designations, terminology, and basic formats of the metric standards should be kept similar to that used in the ANSI B18.3 document. At the November 10, 1976 meeting of Subcommittee 3, it was agree
24、d that the socket screw industry document covering metric hexagon socket button head cap screws should be circu- lated for subcommittee consideration as a proposed standard. It was noted that the dimensional characteristics were very similar to proposals prepared by Working Group 3 of IS0 TC2, the m
25、ajor difference being in the thread fit. The IS0 proposal specifies tolerance class 5g6g whereas the socket screw industry document calls for tolerance class 4g6g, consistent with past prac- tices. Subcommittee acceptance of the content ensued and the document, modified to more closely suit the ANSI
26、 format, was approved by letter ballot to American National Standards Committee B18. Following its approval by the sponsor organizations, the proposal was duly Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license fr
27、om IHS-,-ASME BL8.3.LiM Bb .- Rill 0759670 81343q73 L submitted to the American National Standards Institute and was granted recognition as an American National Standard on August 9, 1979. A periodic review of the Standard, undertaken by the Committee in 1985, resulted in agree- ment that the docume
28、nt should be revised to reference the new ASTM documents for the appropriate mechanical and chemical requirements. A proposai containing these changes, as well as editorial corrections, was prepared and submitted for approval by letter ballot to the ASME Committee B18. Following its approval by the
29、sponsor organization, the proposal was submitted to the Amer- ican National Standards Institute and was designated an American National Standard on Sep- tember 12, 1986. iv Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted witho
30、ut license from IHS-,-ASME B18-3-4M 86 0767670 0043474 3 W ASME STANDARDS COMMITTEE BI 8 Standardization of Bolts, Nuts, Rivets, Screws, Washers, and Similar Fasteners (The following is the roster of the Comrniftee at the time of approval of this Standard.) OFFICERS J. B. Levy. Chairman H. W. Elliso
31、n, Vice Chairman E. Schwartz, Vice Chairman R. W. McGinnis, Secretary COMMITTEE PERSONNEL AMERICAN SOCIETY OF AGRLCULTURAL ENGINEERS E. R. Friesth, Don E. Williams Co., Rock Island, Illinois AMERICAN SOCIETY OF MECHANICAL ENGINEERS, THE A. R. Machell, Webster, New York K. E. McCullough, SPS Technolo
32、gies Inc., Jenkintown, Pennsylvania ENGINE MANUFACTURERS ASSOCIATION G. A. Russ, Cummins Engine Co., Columbus, Indiana FARM (b) nominal she of screw; (c) thread pitch, preceded by X ; (d) nominal screw length, preceded by X ; (e) name of product. Where so desired, the product name may be abbreviated
33、 SBHCS; (f) material and property class. Alloy steel screws shall be supplied to property class 12.9 as specified in ASTM F 835M. For corrosion resistant steel screws, the property class and material requirements shall be as specified in ASTM F 879M (see para. 3.1); (g) protective finish, if require
34、d by ASTM F 879M. n Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-ASME B18-3.4M 8b .O757670 0043478 O 2 ASME/ANSI BI 8.3.4M-1986 EXAMPLES : B18.3.4M - 6 X 1 X 8 Socket Button Head Cap Screw, Alloy
35、Steel dpc .om- Length Product Abbreviation Name or B18.3.4M - 8 X 1.25 X 15 SBHCS, Al-70 1.8 Part Numbering System For users who need a definitive part numbering sys- tem, one is suggested in Appendix II. 2 DIMENSIONAL CHARACTERISTICS The following requirements supplement the dimen- sional data pres
36、ented in Tables 1 and 2, and shall apply to the respective features of screws. 2.1 Heads 2.1.1 Head Height. The tabulated head heights rep- resent metal-to-metal measurements: that is, the trun- cation of the rounded surface caused by the socket is not considered part of the head height. 2.1.2 Beari
37、ng Surface. The plane of the bearing surface shall be perpendicular to the axis of the screw within a maximum deviation of 2 deg. 2.1.3 Head Concentricity. The head shall be con- centric with the axis of the screw shank within an amount equal to 6% of the specified maximum head diameter or 0.2 mm, w
38、hichever is greater, FIM (Full Indicator Movement). Concentricity shall be measured with the screw being held by the threads next to the head (within a distance equal to one screw diameter) and indicating on the outer rounded portion of the head surface, adja- cent to but not on the extreme outer pe
39、riphery. 2.1.4 Underhead Fillet. For all lengths of screws the form of the fillet at the junction of head and shank shall be optional within the following provisions. The fillet shall be a smooth and continuous concave curve fairing into the bearing surface within the limits for di- ameter B with a
40、juncture radius of not less than F, and blending into the shank at a distance from the head not exceeding E as determined at the basic screw diameter D. 2.2 Sockets 2.2.1 Socket Size. Sockets shall be of the nominal size J specified in Table 1 for the respective screw size and shall conform with the
41、 dimensions given in Table HEXAGON SOCKET BUTTON HEAD CAP SCREWS (METRIC SERIES) 2, as determined by gaging in accordance with para. 2.2.3. 2.2.2 Key Engagement. The key engagement depth shall conform with the minimum values specified for T in Table 1, as determined by gaging in accordance with para
42、. 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 allow the GO member of the gage to enter freely to the mini- mum key engagement depth. The NOT GO gage mem- ber shall be permitted to ente
43、r only to a depth equivalent to 7.5 % of the nominal socket size. For determining the acceptability of sockets in plated products after plating, a GO gage identical in design and tolerances to that shown in Table 3, but having a mini- mum width across flats dimensin equal to the nominal socket size
44、shall be employed. 2.2.4 Broached Sockets. For hexagon broached sockets which are at or near the maximum limit of size, the overcut resulting from drilling shall not exceed 20% of the length of any flat of the socket. (See Figs. 1 .and 2.) 2.2.5 Edge of Socket. The edge at the junction of the socket
45、 with the top of the head may be broken (rounded or chamfered) as depicted in Fig. 3, provided the depth of chamfer or rounding does not violate the NOT GO gage penetration limit specified in para. 2.2.3. 2.2.6 Socket True Position. The axis of the socket shall be located at true position relative t
46、o the axis of the screw within a tolerance zone having a diameter equal to 3% of the basic screw diameter or 0.26 111111, whichever is greater, for nominal screw sizes up to and including 12 mm; and equal to 6% of the basic screw diameter for sizes larger than 12 mm, regardless of fea- ture size. 2.
47、2.7 Wall ,Thickness. The minimum wall thick- ness G specified in Table 1 shall apply only to screws having nominal lengths shorter than two times the basic screw diameter which are not subject to tensile testing in accordance with para. 3.5.2. 2.3 Length 2.3.1 Measurement. The length of the socket b
48、ut- ton head cap screw shall be measured, parallel to the axis of the screw, from the plane of the bearing surface under the head to the extreme end of the shank. Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license
49、 from IHS-,-ASME B18.3.4M 8b 1111 07-57b70 0043477 2 M HEXAGON SOCKET BUTTON HEAD CAP SCREWS (METRIC SERIES) ASME/ANSI B18.3.4M-1986 2.3 I IIrB I Pee para. 2.5 14 I +See para. 2.4.4 I / 4 k- See para. 2.4.4 countersink permissible TABLE 1 DIMENSIONS OF METRIC HEXAGON SOCKET BUTTON HEAD CAP SCREWS 7 Under Head Fillet S J T H Head Height L Maximum Standard Length Nominal Size or Basic Screw Diameter Head Side Height iexagon Socket Size nom. Key ingage- ment m
