1、I ACCEPTANCE NOTICE This non-Government document was adopted on 27 February 1987, and is approved for use by the DoD. The indicated industry group has furnished the clearance required by existing regulations. Copies of the document are stocked by the DoD Single Stock Point, Naval Publications and Fo
2、rms 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 Institute, 14
3、30 Broadway, New York, NY 10015. Title of Document: Metric serles Socket Set Screws Document Number: ASME/ANSI B18.3.6M-1986 Date of Specific Issue Adopted: 16 October 1986 Releasing Industry Group: The American Society of Mechanical Engineers NOTICE: When reaffirmation, amendment, revision, or canc
4、ellation 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. Cu s t od ians : Army - AR Navy - AS Air Force - 99 Review Activities: Army - AV, ER, MI NSA - NS DLA, I
5、S User Activities: Army - AT, ME Navy - MC, OS, SH Civil Agency Coordinating Activities: GSA - FSS AMSC NIA Military Coordinating Activity: Army - AR (Project 5305- 1676) DISTRIBUTION STATEMENT A. Approved for public release; distribu unlimited. - - THIS DOCUMENT CONTAINS PAGES. tion is Copyright AS
6、ME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-AN AMERICAN NATIONAL STANDARD Metric Series Socket Set Screws ASMEIANSI BI 8.3.6M-1986 (REVISION OF ANSI B18.3.6M-1979) Government Key Words: Setscrew, Hexagon, So
7、cket - Metric SPONSORED AND PUBLISHED BY THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS United Engineering Center 345 East 47th Street i New York, N. Y. 1 O01 7 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license fro
8、m IHS-,-Date of Issuance: February 28, 1987 This Standard will be revised when the Society 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 wa,s developed under procedures
9、 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 competent and concerned interests have had an opportunity to participate. The proposed code or standard was made available for
10、public review and comment which provides an opportunity for additional public input from industry, 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 respe
11、ct 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 liability for infringement of any applicable Letters Patent, nor assume any such liability. Users of a code or standard are e
12、xpressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, is entirely their own responsibility. Participation by federal agency representative(s1 or person(s) affiliated with industry is not to be interpreted as government or industry
13、endorsement of this code or standard. ASME accepts responsibility for only those interpretations 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 e
14、lectronic retrieval system or otherwise, without the prior written permission of the publisher. Copyright O 1987 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A. c Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction o
15、r networking permitted without license from IHS-,-FOREWORD (This Foreword is not part of ASME/ANSI B18.3.6M-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 B18 under the
16、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) with the Society of Automo- tive Engineers and the American Society of Mechani
17、cal Engineers as joint sponsors. Subcommittee No. 9 was established in April 1929 to undertake the development and oversee the maintenance of standards covering socket head cap screws and set screws. In line with a general realignment of the subcommittee structure on April 1, 1966, Subcommit- tee 9
18、was redesignated Subcommittee 3. Over the intervening years this activity has pro- duced several versions 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 B
19、18, Sub- committee 3 was assigned the task of preparing standards for metric series socket screw products paralleling that contained in the latest ANSI B18.3 document. The Subcommittee was also instructed to continue coordinating that activity with the International Standards Organization, IS0 Techn
20、ical Committee2, and Working Group 3, and, to the extent possi- ble, to 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 foll
21、owing 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, the metric standards should maintain the same quality levels as their inch counterparts. (b) To facilitate
22、 and expedite the processing, acceptance, and adoption of the metric ver- sions, proposals for thevarious product categories should be prepared as separate and com- plete prodiuct standards. (c) To promote understanding and assimilation during the transition to metric, the di- mensional symbols, des
23、ignations, 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 agreed that thesocket screw industry document covering metric series hexagon socket set screws should be circula
24、ted for subcommittee consideration as a proposed standard. It was noted that there were some di- mensional differences between this document and the recently published IS0 standards, namely, in the details of some of the points and the thread fit, The IS0 standards specify tolerance class 5g6g, wher
25、eas the socket screw industry document requires 4g6g, consistent with past practices. Also, the physical and mechanical requirements contained in the refer- enced documents in the IS0 standard were somewhat less stringent. Subcommittee accept- ance of the content ensued and the document, modified to
26、 moie closely suit the ANSI format, was approved by letter ballot to American National Standards Committee B18. iii Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-. ASME B38.3.bM Bb 0757670 0043534
27、O 9 Following approval by the sponsor organizations, the proposal was submitted to the Ameri- can National Standards Institute and granted recognition as an American National Stan- dard on August 14, 1979. A periodic review of the standard, undertaken by the Subcommittee in 1985, resulted in agreeme
28、nt that the document should be revised to clarify the dimensions of spline socket sizes, to incorporate by reference the appropriate ASTM specifications for the mechanical and chemical properties, and to upgrade thread gaging. A proposal containing these changes, as well as editorial corrections, wa
29、s prepared for and balloted by letter ballot to ASME Committee B18. Following approval by ASME, the proposal was submitted to the American National Standards Institute and designated an American National Standard on October 16, 1986. D iv Copyright ASME International Provided by IHS under license wi
30、th ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-ASME BL8*3-6M 86 0759670 0043515 2 ASME STANDARDS COMMITTEE BI8 Standardization of Bolts, Nuts, Rivets, Screws, Washers, and Similar Fasteners (The following is the roster of the Committee at the time of approval
31、 of this Standard.) 7 . . .- . - . OFFICERS J. B. Levy, Chairman H. W. Ellison, Vice Chairman E. Schwartz. Vice Chairman R. W. McGnnis, Secretary , ._ . = COMMITTEE PERSONNEL .I. AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS E. R. Friesth, Don E. Williams Co., Rock Island, Illinois _“ =. L. . AMERICAN
32、SOCIETY OF MECHANICAL ENGINEERS .* A. R. Machell, Webster, New York K. E. McCullough, SPS Technologies Inc., Jenkintown, Pennsylvania ENGINE MANUFACTURERS ASSOCIATION . -._ .- - - G. A; Russ, Cmmins Engine Co, Clombus, Indiana -1 FARM shall be at the discretion of the manufacturer unless agreed upon
33、 otherwise by manufacturer and purchaser. 1.5 Responsibility for Modification The manufacturer shall not be held responsible for malfunctions of product due to plating or other modi- fications, when such plating or modification is not ac- complished under his control or direction. 1.6 Terminology Fo
34、r definitions of terms relaiing to fastenersor to component featuresthereof used in this Standard, re- fer to ANSI B18.12, Glossary of Terms for Mechani- cal Fasteners. 1.7 Designation Metric socket set screws conforming to this Stan- dard shall be designated by the following data in the sequence sh
35、own: (a) Specification (ASME/ANSI document) num- ber followed by a dash; (b) Nominal size of screw; (c) Thread pitch, preceded by X ; (6) Nominal screw length, preceded by x ; (e) Drive. Unless specified otherwise, hexagon socket will be supplied. (B Point style and product name. Product name may be
36、 abbreviated SS. Point may be pt. (g) Material and property class. Alloy steel screws shall be as specified in ASTM F 912M. Corrosion- resistant steel screws shall be as specified in ASTM F 880M (see para. 3.1). (h) Protective finish, if required (see para. 3.1). Examples: . -B18.3.6M-6 x 1 x 8HexSo
37、cketCupPointSocketSetScrew, B18.3.6M - i0 x 1.5 x 25 Sphe Socket, Flat, Pt., SS, Alloy Steel, Zinc P1. B18.3.6M - 8 x 1.25 x 10 Cone Pt, SS, Al-70 1 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-AS
38、ME BLB*3-bM Bb ASME/ANSI BI 8.3.6M-1986 1.8 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, 2, and 3 and shall apply to th
39、e respective features of set screws. 2.1 Face The face is the flat surface on the socket end of the screw, bounded by the thread and the socket. 2.1.1 Face Angularity. The plane of the face shall be approximately perpendicular to the axis of the screw. 2.1.2 Face Chamfer. The face on screws having a
40、 nominal length longer than the nominal screw diame- ter shall be chamfered. The chamfer angle V shall be between 30 deg, and 45 deg. The chamfer shall extend slightly below the root of the thread, and the edge be- tween the face and chamfer may be slightly rounded. For screws having a nominal lengt
41、h equal to the nominal diameter or shorter, chamfering shall be at the option of the manufacturer. If chamfered, the chamfer angle Vshall not exceed 45 deg. 2.2 Sockets 2.2.1 Socket Size. Hexagon sockets shall be of nominal size Jspecified in Table 1 , and shall conform to the dimensions given in Ta
42、ble 3, with gaging in ac- cordance with para. 2.2.3. Spline sockets shall be of nominal size Mas speci- fied in Table 1, and shall conform to the dimensions given in Table 4, with gaging in accordance with para. 2.2.3. 2.2.2 Key Engagement. For screws of nominal lengths exceeding those listed in Tab
43、le 1 , the minimum key engagement T for the longest length shown shall apply. They represent the minimum key engagement depth necessary to develop the full functional capabil- ity of keys conforming to ANSI B18.3.2M7 Metric Series Hexagon Keys and Bits. Compliance with minimum depth requirements sha
44、ll be determined by gaging in accordance with para. 2.2.3. 9 0754670 0043519 T 9. METRIC SERIES SOCKET SET SCREWS FIG. 1 SOCKET EDGE DETAIL CAUTION: The use of set screws having a key engagement shallower than the deepest listed in Table 1 for the respective screw size can result in failure of the s
45、ocket, key, or mating threads during tightening because the key engagement and thread length are less than optimum. It is, therefore, strongly recommended that longer screw lengths having deepest minimum key engagements be used wherever possible. 2.2.3 Socket Gaging. Acceptability of hexagon sockets
46、 shall be determined by the use of the hexagon socket gages specified in Table 5. The hexagon sockets shall allow the GO member of the gage to enter freely to the minimum key engagement depth (para. 2.2.2). The NOT GO gage member shall be permitted to enter only to a depth equivalent to 10% of the n
47、ominal size for nominal socket sizes up to and including 1.5 mm, and to 7.5Vo of thenominal socket size for larger sizes. Acceptability of spline sockets shall be determined by the use of the spline socket gages specified in Table 6. The splinesockets shall allow the GO member of the gage to enter f
48、reely to the minimum key engagement depth (para. 2.2.2). The NOT GO member shall be permitted to enter only to a depth equivalent to 10% of the nominal socket size for nominal socket sizes up to and including 1.52 mm, and to 7.5% of the nominal socket size for larger sizes. To determine the acceptab
49、ility of sockets in plated products after plating, a GO gage identical in design and tolerances to that shown in Table 5, except having a maximum width across flats dimension equal to the nominal key size, shall be employed. To determine the acceptability of spline sockets in plated products after plating, a GO gage identical in design and tolerances to that shown in Table 6, except having a maximum major diameter dimension equal to the nominal key size, sha
