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1、BRITISH STANDARD BS A 303:1994 ISO 3185:1993 Bolts, normal bihexagonal head, normal shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1100 MPa Dimensions Licensed Copy: London South Bank University, London South Bank University, S
2、at Dec 09 03:32:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 303:1994 This British Standard, having been prepared under the direction of the Aerospace Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 August 1994 BSI 01-2000 The fo
3、llowing BSI references relate to the work on this standard: Committee reference ACE/12 Draft for comment 90/79568 DC ISBN 0 580 23217 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Aerospace Standards Policy Committee (ACE/-) to Techn
4、ical Committee ACE/12, upon which the following bodies were represented: The Association of Electronics, Telecommunications and Business Equipment Industries British Industrial Fasteners Federation Ministry of Defence Society of British Aerospace Companies Ltd. Amendments issued since publication Am
5、d. No.DateComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:32:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 303:1994 BSI 01-2000i Contents Page Committees responsibleInside front cover National forewordii 1Scope1 2Normative references1 3Configura
6、tion and dimensions1 Figure 12 Table 13 List of referencesInside back cover Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:32:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 303:1994 ii BSI 01-2000 National foreword This British Standard has been prepared
7、 under the direction of the Aerospace Standards Policy Committee. It is identical with ISO 3185:1993 Aerospace Bolts, normal bihexagonal head, normal shank, short or medium length MJ threads, metallic material, coated or uncoated, strength classes less than or equal to 1 100 MPa Dimensions, publishe
8、d by the International Organization for Standardization (ISO). The Technical Committee has reviewed the provisions of ISO 4095:1978, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A British Standard does not purpo
9、rt to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International StandardCorresponding British Standard ISO
10、286-2:1988BS EN 20286 ISO system of limits and fits. Part 2:1992 Tables of standard tolerance grades and limit deviations for holes and shafts (Identical) ISO 3353:1992BS 2A 231:1993 Rolled threads for bolts. Lead and runout requirements (identical) ISO 5855-2:1988BS 6293 Aerospace MJ threads. Part
11、2:1994 Limit dimensions for bolts and nuts (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. Thi
12、s will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:32:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 303:1994 BSI 01-20001 1 Scope This International Standard specifies the dimensions of n
13、ormal bihexagonal head bolts, with close or large tolerance normal shank, and short or medium length MJ threads, in metallic material, coated or uncoated, with strength classes less than or equal to 1 100 MPa. It is intended for the drawing up of aerospace product standards. 2 Normative references T
14、he following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard
15、are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 286-2:1988, ISO system of limits and fits Part 2: Tables of standard tolerance grades and lim
16、it deviations for holes and shafts. ISO 3353:1992, Aerospace Rolled threads for bolts Lead and runout requirements. ISO 4095:1978, Fasteners for aerospace construction Bi-hexagonal wrenching configuration. ISO 5855-2:1988, Aerospace MJ threads Part 2: Limit dimensions for bolts and nuts. 3 Configura
17、tion and dimensions See Figure 1 and Table 1. Dimensions and tolerances are expressed in millimetres. They are applicable after any surface coating, but before the application of any lubricant. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:32:47 GMT+00:00 2
18、006, Uncontrolled Copy, (c) BSI BS A 303:1994 2 BSI 01-2000 Figure 1 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:32:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 303:1994 BSI 01-20003 Table 1 Diameter code Threada D1 D2D3D4D5D6D7D8Coated bolts Uncoat
19、ed bolts nom.tol.tol. closelargecloselargenom.tol.min.min.max.H13bH13b 040MJ4 0,7 4h6h4 h12bf7bh12b 35,87,58,3 1 1,1 050MJ5 0,8 4h6h53,23,4 0,5 6,88,39,1 1,5 060MJ6 1 4h6h64,14,27,89,8 10,6 1,4070MJ7 1 4h6h74,95,28,8 11,3 12,1 1,9 080MJ8 1 4h6h85,26,29,8 12,8 13,6 100MJ10 1,25 4h6h 106,77,911,8 15,7
20、 16,7 1,62,4 120MJ12 1,25 4h6h 1289,813,7 18,8 19,9 Diameter code HKL1c L2L3 PR1ST Wrenching dash numberd ThreadThread min.h15bnom.tol.shortmediumshort mediumnom.tol.min. 0400,85,52 to 40 0,2 7,510563,50,42,506 05016,53 to 5091267,54,50,52,52,807 0601,27,53 to 601014 7 8,55,2 0,7 2,83,508 0701,48,24
21、 to 7011159,55,93,33,809 0801,68,64 to 8011,516,57,5 10,56,33,73,910 100210,15 to 10014,520,59137,70,84,74,212 1202,411,46 to 1201622,51014,58,80,95,64,514 a In conformity with ISO 5855-2, except for the maximum major diameter “d” of bolts with a close tolerance on D 1, which shall be equal to D1min
22、. 0,025. b See ISO 286-2. c Increments: 1 for L1u 30 2 for 30 100 If greater lengths are required, they shall be chosen using these increments. d In conformity with ISO 4095 over T min. +0,5 0 0,010 0,035 0 0,5 0,013 0,038 0,016 0,041 +0,4 0 0 0,2 0 0,3 Licensed Copy: London South Bank University, L
23、ondon South Bank University, Sat Dec 09 03:32:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI 4 blank Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:32:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 303:1994 BSI 01-2000 List of references See national fore
24、word. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:32:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS A 303:1994 ISO 3185:1993 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for
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33、sed for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel: 020 8996 7070. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 03:32:47 GMT+00:00 2006, Uncontrolled Copy, (c) BSI