1、ANSI: 1118.3.2M-79 . 30 April 1982 ACCEPTANCE NOTICE Ilhis iion-Government docuiiient was adopted on 30 April 138:!, and is approved for The indicated industry group has furnished the clearance required use by the DOD. by existing regulations. Point, Naval Publications and Forms Center, Philadelphia
2、, PA 19120, for issue to Doil activities only. Copies of the document are stocked by the DoD Single Stock Contractors and nustry 1:roups iniisL olc:i iii (:upics dircccy roiii: The American Society of Mechanical Engineers United Engineering Center, 345 E. 47th Street New York, NY 0017 or The America
3、n National Standards Institute 1430 Broadway, New York, NY 10018 Title of Document: Metric Series Hexagon Keys and Bits ANSI Document No : ANSI B18.3.2M-79 Date of Specific Issue Adopted: 17 May 1979 Kclcnsing iidustry Croup: lie hncr icm Society o !-Iccui I) icnl. I5nginucrs NOTICE: Wlicn rcnffirmn
4、l- ion, nincncliiicnt , rc!v i s ion, or c:inc.c$i 1 :it Lori o Lh is standard is intrilly proposed, iic iiidusirry group rcspons il)J c! 1:or tllis standard shall inform the military coordinating activi cy of tic propos(id clioii;c and request par(; ic ipa ion. Custodians : Navy - AS Air Force - 99
5、 Amy - Ci Military Coordinating Activity: (Pro jcct 5.120-BOO4) Amy - AR Revim Activities: Army - AV, MI, ER, GL, ME, FA Eavy - MC DLA - IS ESA - NS Us er Ac t iv i t ies : Navy - SH, MC Civil Agencies Coordinating Activities: GSA - FSS PROBLEM HARD COPY Copyright ASME International Provided by IHS
6、under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-AMERICAN NATIONAL STANDARD Metric Series Hexagon Keys and Bits ANSI B18.3.2M - 1979 For Socket Screw Products O SECRETARIA T SOCIETY OF AUTOMOTIVE ENGINEERS THE AMERICAN SOCIETY OF MECHANICAL ENGI
7、NEERS PUBLISHED BY THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS United Eng nee ring Center 345 East 47th Street New York, N. Y. 1 O01 7 o Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-No part of th
8、is 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 O 1979 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All Rights Reserved Printed in U.S.A. Copyright ASME In
9、ternational Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-FOREWORD The American National Standards Committee B18 for the standardization of bolts, screws, nuts, rivets and similar fasteners was organized in March 1922, as Sect
10、ional Committee B18 under the 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 insti- tute, Inc.), with the Society of Automotive Engineer
11、s and the American Society of Mechanical Engineers as joint sponsors. Subcommittee No. 9 was established in April of 1929 to undertake development and oversee mainte- nance of standards covering Socket Head Cap Screws and Set Screws. In line with a general realignment of the subcommittee structure o
12、n 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 and set screws bearing the B18.3 designation. At the December 4, 1974 meeting of Americe Na
13、tional Standards Committee B18, Subcommittee 3 was assigned the task of preparing standards for metric series socket screw products paralieling that con- tained in the latest ANSI B18.3 document. The subcommittee was also instructed to continue coordination with the International Standards Organizat
14、ion, IS0 Technicd Committee 2 and Working Group 3 under that activity, and to the extent possible keep the proposals for metric standards under development in con- formance with agreements reached therein. Subsequent meetings of Subcommittee 3 held in February, 1975 and January, 1976 resulted in gen
15、eral agreement on the following basic principles to be considered in developing the metric version of the stan- dard: (1) 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 cou
16、nterparts; (2) to facilitate and expedite the processing, acceptance and adoption of the metric versions, proposals for the various product categories should be prepared as separate and complete product standards; (3) to promote understanding and assimilation during the transition to metric the dime
17、nsional 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 agreed the socket screw industry docu- ment covering metric hexagon keys should be circulate
18、d for subcommittee consideration as a proposed standard. It was noted that this document included the 0.7, 0.9 and 1.3 mm-key sizes which were soft conversions of the 0.028, 0.035 and 0.050 inch keys, respectively, required for wrenching the 1.6, 2 and 2.5 mm set screws aiready called for in IS0 sta
19、ndards and that although there were differences in the tolerance structure and strength capabilities, the keys contained therein would satisfy the dimensional and mechanical requirements of the existing IS0 standard covering keys for sizes 2.5 mm and larger. Subcom- mitteee acceptance of the content
20、 ensued and the document, modified to more closely suit the ANSI format, was approved by letter ballot to American National Standards Committee B18. Foliowing its approval by the sponsor organizations, the proposal was duly submitted to the American National Standards Institute and was granted recog
21、nition as an American National Standard on May 17,1979. iii Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-p- f ASME BZ8.3*2M 77 25955112 0015(357 T AMERICAN NATIONAL STANDARDS COMMITTEE BI8 Standar
22、dization of Bolts, Nuts, Rivets, Screws, Washers and Similar Fasteners OFFICERS R. P. Trowbridge, Chairman J. 0. Levy, Vice-Chairman H. G. Muenchinger, Vice-chairman R. McGinnis, Secretary COMMITTEE PERSONNEL AMERICAN CHAIN ASSOCTATION L. E. Hampel, MoIine Malleable Iron Company, St. Charles, Iliino
23、is Donald Wanek, Wrought Washer Manufacturing Company, Milwaukee, Wisconsin R, T. Kelly, Hitchcock Publishing Company, Wheaton, Illinois AMERICAN HARDWARE MANUFACTURERS ASSOCIATION AMERICAN INSTITUTE OF INDUSTRIAL ENGINEERS AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS E. R. Friesth, Deere nominal key
24、(or bit) size; Product name; series (for keys); and profectivecoating, if required. Examples: B18.3.2 6 mm Hexagon Key, Short Series B18.3.2 8 mm Hexagon Key, Long Series, Nicke1 B18.3.2 32 mm Hexagon Bit Plated L Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo r
25、eproduction or networking permitted without license from IHS-,-AMERICAN NATIONAL STANDARD METRIC SERIES HEXAGON KEYS AND BITS ANSI 618.3.2M-1979 I FIG. 1 KEY SEE PAR. 2.2 FIG.2 BIT Table 1 Dimensions of Metric Hexagon Keys and Bits Hexagon Hexagon Socket Flats Corners 0.7 0.9 1.3 1.5 2 2.5 3 4 5 6 8
26、 10 12 14 17 19 22 24 27 32 36 Size Max Min Max I 0.711 0.698 0.798 0.899 0.876 0.998 1.270 1.244 1.422 1.500 1.470 1.690 2.000 1.970 2.250 2.500 2.470 2.820 3.000 2.960 3.399 4.000 3.960 4.532 5.000 4.960 5.690 6.000 5.950 6.828 8.000 7.950 9.136 10.000 9.950 11.470 12.000 11.950 13.764 14.000 13.9
27、30 16.058 17.000 16.930 19.499 19.000 18.930 21.793 22.000 21.930 25.234 24.000 23.930 27.525 27.000 26.870 30.969 32.000 31.840 36.704 36.000 35.840 41.292 I 1 I Min 0.762 0.960 1.372 1.640 2.200 2.770 3.340 4.470 5.630 6.760 9.030 11.340 13.590 15.880 19.300 21.580 25.000 27.240 30.710 36.430 40.9
28、00 - BI C I Length I Length of Long Arm Short of Arm ! Short Series - Max 8 11 16 14 16 18 20 25 28 32 36 40 45 56 63 70 80 90 1 O0 125 140 - Min Max Min 3 34 28 6 34 28 11 44 39 13 45 43 15 50 48 17 56 53 18 63 60 23 70 66 26 80 76 30 90 86 34 100 95 38 112 106 43 125 119 53 140 133 60 160 152 67 1
29、80 171 76 200 190 86 224 213 95 250 238 119 315 300 133 355 338 Long Series Max Min 69 63 71 65 75 69 78 76 83 81 90 87 100 97 106 102 118 114 140 136 160 155 170 164 212 206 236 229 250 242 280 271 335 325 375 364 - - - - - - - R Radius of Bend Min 1.5 1.5 1.5 1.5 2.0 2.5 3.0 4.0 5.0 6.0 8.0 10.0 1
30、2.0 14.0 17.0 19.0 22.0 24.0 27.0 32.0 36.0 - - - L K :hamfar Length Max 0.08 0.10 0.14 0.14 0.14 0.14 0.18 0.24 0.30 0.36 0.49 0.62 0.76 0.85 1 .O4 1.16 1.36 1.49 1.68 1.99 2.25 - For additional requirements refer to applicable paragraphs in the text on Pages 1,3 and 4. 2 Copyright ASME Internation
31、al Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-.y ASME B18*3-2M 77 W 2575532 0035064 3 AMERICAN NATIONAL STANDARD METRIC SERIES HEXAGON KEYS AND BITS (- 2 DIMENSIONAL CHARACTERISTICS The following requirements supplement the
32、 dimen- sional data presented in Table 1 and shaU apply to the respective features of keys and bits. 2.1 Truncation of Hexagon Corners The truncation or rounding of the hexagon comers within the specified width across corners dimensions shall be evident on all comers. 2.2 Ends Each end shall be perp
33、endicular to the axis of the respective arms of keys and the longitudinal axis of bits within 4 deg and the edges may be sharp radiused or chamfered at the option of the manufacturer. Where ends are chamfered, the length of the chamfer shall not exceed the values listed for “K” in Table 1. 2.3 Angle
34、 of Bend The angie of bend between the axis of the short arm and the axis of the long arm on hexagon keys shall be +2 deg. 3 MATERIAL, PROCESSING AND MECHANICAL PROPERTIES Keys and bits shall conform to the following re- quirements pertaining to materials, processing, me- chanical and physical prope
35、rties, and testing and sampling procedures: 3.1 Material and Heat Treatment Hexagon keys and bits shall be fabricated from an alloy steel having two or more of the following alioy- ing elements: chromium, nickel, molybdenum or vanadium in sufficient quantity to assure that the me- chanical and physi
36、cal requirements specified under Paragraph 3.3 can be met when the keys and bits are hardened by quenching from the austenitizing tem- perature and tempered. 3.2 Finish The finish on keys and bits shall be an oiled black oxide coating or the oxide coating resulting from heat treatment, unless otherw
37、ise specified by the purchaser, 3.3 Mechanical and Physical Requirements 3.3.1 Hardness, Hexagon- keys and bits wiu have a hardness range of Rockwell C50 to C57 for nominal sizes up to and including 12 mm, and Rockwell C45 to C53 for sizes 13 mm and larger. For sizes 2 mm ( r- ANSI B18.3.2M-1979 and
38、 smaller, the microhardness requirement is hoop 565 to 685 or the Vickers equivalent. 3.3.2 Torsional Strength. Hexagon keys and bits when subjected to the torsional strength test defined in Paragraph 3.3.2.1 shall withstand the torsional moments specified in Table 2 without taking a per- manent ang
39、ular deflection or set of more than 10 deg. The test key or bit shall not exhibit any flaws, cracks or other defects which might affect its serviceability and the portion engaged in the socket shall show no distortion or rounding of comers. For nominal sizes up to and including 8 mm, the key or bit
40、shail be fuqther tested to failure in accor- dance with the torsional shear test described in Para- graph 3.3.2.2. The failure shall occur as a clean and relatively square, shear fracture. Any splintering or brittle type failures shall be cause for rejection. Table 2 Torsional Moments for Torsional
41、Nominal Size Key 0.7 0.9 1.3 1.5 2 2.5 3 4 5 6 8 Strength Test Torsional Nominal Moment Key Nsm Size 0.1 TO 0.2 12 0.6 14 1 .o 17 2.1 19 4.7 22 7.7 24 17.8 27 35 32 57 36 126 Torsional Moment N-m 252 420 670 1180 1670 2450 3200 4300 6800 1 O000 3.3.2.1 Torsional Strength Test. The key or bit shall b
42、e inserted info a hexagon socket adapter de- signed for the size being tested. See Figure 3. The socket size in the adapter shall not exceed the nominal hexagon size by more than 0.025 mm and the adapter shall have a hardness of Rockwell C60 or greater for nominal sizes up to and including 14 mm and
43、 Rock- well C45 minimum for sizes larger than 14 mm. The depth of key engagement shall be equal to the nominal key size for the 1.5 mm and larger sizes and equivalent to 1.5 times the nominal key sizes for sizes smallet than 1.5 mm. With the socket adapter mounted in-a suitable test fmture (see Figu
44、re 4), a torsionalmoment equal to 20 percent of that listed in Table 2 shall be applied to the key or bit, then released. The angular reference line thereby established shall be recorded. 3 .- Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networ
45、king permitted without license from IHS-,- .- ASME B38*312M 77 W 2575532 0035065 5 P AMERICAN NATIONAL STANDARD METRIC SERIES HEXAGON KEYS AND BITS t- IRMI b 1; I KEY UNDER TEST LOAD TEST HEXAGON SOCKET ADAPTER DEPTH OF KEY ENGAGEMENT FIGURE 3. TORSIONAL MOMENT LOAD APPLICATION The fuii torsional mo
46、ment given in Table 2 shall be applied, then released, and the resulting angular dis- placement noted. The permanent set (difference be- tween the angular readings) shail be determined and the test specimen examined. 3.3.2.2 Torsional Shear Test. For sizes up to and including 8 mm, the test key or b
47、it shall be reinserted into the hexagon socket adapter in the torsional strength test fmture to a depth at least equal to that specified in Paragraph 3.3.2.1. The torsional moment shall be increased until the key or bit fails and the fracfure examined to determine compliance with Paragraph 3.3.2. AN
48、SI B18,3.2M-19.79 DEGREE SCALE c, ST U RT EVANT t TYPE FIXTURE WRENCH A II KEY UNDER TEST 7 r nEXAGON SOCKET ADAPTER FIGURE 4. TYPICAL TORSIONAL STRENGTH TEST FIXTURE 3.3.3 Sample Size. The tests required under Para- graphs 3.3.1 and 3.3.2 shall be performed on a random sample size selected in accordance with Table 3, Table 3 Sample Size for Mechanical Testing Lot Quantity Sample Size Up to 50 51 to 500 501 to 35 O00 Over 35 O00 4 MO0108 Copyright ASME International Provided by IHS under license with ASMENot for ResaleNo reproduction or networking permitted without license from IHS-,-
