1、ES1 A*22b b5 H lb24bb OBBL875 9 A.226, December, 1965 UDC 629.13.01: 621.882.21 1 : 669.14 BRITISH STANDARD SPECIFICATION FOR STEEL HEXAGON HEAD BOLTS (Short Thread : Class 3A) FOREWORD In this British Standrd the bolt lengths cire based upon fractional increments. Reference is made in the standzrd
2、to the following British Standards: A.100. 2s. 95. 2s. 96. 2S.102. 2S.105. Carbon steel (wire only for the manufacture of forged bolts not eiceedhg $4 in shank diameter). 2S.114. 2S:116. 2S.117. B.S.lSS0. Bolts 2nd nuts for aircraft (general clauses). 1 W per cent nickel-chromium-polybdenurn steel (
3、55/65 tonf/sq in). 2% per cent nickel-chromium-molybdeniim steel (55/65 tonf/sq in). Carbon-molybdenurn steel (wire only for the manufacture of forged bolts). Manganese-molybdenum steel (55/65 tod,lsq in). 40 carbon steel bright bars for machining (55/65 tonf/sq in). 1 per cent chromium steel (55/65
4、 toERAL REQL!MENTS M4TERIAL AND MWUFACTURE (i) Forged from material which complies with the latest issue of one of the following British Stacdards: s.107 or S.105 or S. I37 or s. I48 or s. 14) , 01 s.* b. ln the finally hea:-treoted coridition, the mechznicsl properties of forged bolts or their repr
5、esentative test samples shall be as follovs: 0.1 per cent proof stress: not less than 97 o00 Ibf/inl Tensile strengh: not less than 124 o00 Ibf/in: not more than 146 OCXI Ibf/in? (1 O2 kgf/mml) not less than 40 ft Ibf (6 kgm). (6s kgf/mm?) (87 kgf/m2) Elongation on 5.65 ,So: not less than 13 per cen
6、t Izod impact value: A.226, December, 1965 DIMENSIONS 4. a. All finished bolts, after the application of the anti- corrosion coating shall conform to the dimensions and tolerances given in Tables 1 and 2. b. The runout of thread shall be as dened in SBAC publication R.S. 678.* c. The nominal length
7、of the bolt shall be the bearing length L. *Obtainable from Society of British Aerospace Companies, 29, King Street, St. Jamess, London, S.W.1. SCREW THREADS 5. The bolts shall have Unified threads of the form specified in B.S. 1580, Part 3 and shall conform to the Class 3A limits and tolerances spe
8、cified therein. . ANTI-CORROSION TREATMENT 6. Ail finished bolts shall be coated with cadmium. INSPECTION PROCEDURE 7. The bolts shall be inspected in accordance with the relevant requirements of British Standard A.lOO, Part 2. 2 A.226, December, 1965 5 uu fio aw i?%S4 .BO 0 r r O000 n E d $ P 2 C O
9、 u .- +A % .- 5 c1 .- 54 x N . -. e 2 E 3 1 BSI A*ZZb b5 Lb24bb 8081078 4 1 A.226, December, 1965 TABLE 2. BEARING LENGTK L AND OVERALL LENGTH E Fig. 3. No. 8-32 UNC NO. 10-32 TJNF No. 4-40 U?lC I No. 6-32 UNC - *L rto.010 in 0.062 0.125 0.188 0.250 0.312 0.375 0.438 0.500 0.562 0.625 0.688 0.750 0-
10、812 0.875 0.938 1.OoO 1.125 1,250 1.375 1.500 1,625 1.750 Part No. Part j *L E I Part 1 in I in A 1 : 0.062 0.370 I B 1 NO. . fzO.010 I f0.015 I NO. I *L 3.500 in 2.982 3.107 3.232 3.357 3.483, 3.607 3.732 3.857 B58 ! 3.625 3.982 4.107 4.232 4.357 4.482 4.607 4.732 4.857 4.982 5.107 5-232 5.357 5.48
11、2 5 -857 5.982 5.607 5-732 6.107 *Sec Subclause 4c. Part *L No. kO.010 C42 c44 C46 C50 C52 c54 C56 C58 C60 C62 C64 C66 C68 C70 C72 c74 C76 C78 c4a Cao ca2 Ca4 C86 Ca8 c90 C92 in 2.625 2.750 3 ao 3.125 3.250 3.375 3.500 3.625 3.750 2.875 3.875 44300 4.125 4450 4.375 4.500 4.625 4.750 5.000 5.125 5.25
12、0 5.375 5.500 5625 5.750 4-875 in 3.029 3.154 3.279 3.404 3.529 3.654 3.779 3.904 4.029 4.154 4,279 4.404 4.529 4.654 4.779 in D42 I 2.625 D44 2.750 D18 3.000 D50 I 3.125 D52 3-250 D54 3.375 D56 3.500 D58 3.625 D60 , 3.750 46 I 2.875 D62 I 3.875 D64 4.000 D66 I 4.125 D68 i 4.250 D70 . 4.375 4.904 D7
13、2 5.029 5.154 5.279 5.404 5-529 5.654 5.779 5.904 6.029 6.154 c74 C76 c78 Cao ca2 c84 C86 CE3 C90 C92 C94 C96 4.500 4.625 4.750 5.000 5.125 5.250 5.375 5 -500 5.625 5.750 6.000 4.875 5.875 in 3.029 3.154 3.279 3.404 3.529 3.654 3.779 3.904 4.029 4-154 4.279 4.404 4.529 4.654 4.779 4.904 5.029 5.154
14、5.279 5.404 5.529 5.654 5.779 5.904 6.029 6.154 6.279 6404 NOTE. Bolts below the heavy line may not be rcadily available in large quantities because of limitations in manufacture by forging. 5 1 I ES1 A*22b b5 1b24bb9 0081080 - 2 M I A.226, December, 1965 APPENDIX TABLE FOR CONVERSION OF INCHES TO A
15、PPROXIMATE MILLIMETRE EQUIVALENTS 1 i 25.4 2 50.8 3 76.2 4 101.6 5 I 127.0 6 152.4 7 177.8 8 I 203.2 9 1 228.6 10 254.0 This British Standard, having been approved by the Aircraft Industry Standards Committee and endorsed by the Chairman of the Engineering Divisional Council, was published under the
16、 authority of the General Council of the Institution on 29th December, 1965. The Institution desires to call attention to the fact that this British Standard is intended to include the technical provisions necessary for the supply of the material herein referred to, but does not purport to comprise
17、all the necessary provisions of a contract. British Stathrds are revised, when necessary, by the issue either of aniertdttietit slips or of revised editiotis. It is important that users of British Standards should ascertaiti that they are iti possession of the latest amendmetits or editions. The fol
18、lowing B.S.I. references relate to the work on this standard: Committee reference ACE/l2. Draft for comment D63/11890. _ - Printed in Engand by Gaylard G Son Lid., Lotidori, S.E.14. G65!810 2,500 12/65 t PD 5913 Amendment No. 1, publislied 22 Scptciiibcr, 1 Ofdi to British Slaiidard A. 226 : 1905 St
19、eel hexagon liead bolts (Short thread: Class 3A) L Coriigeiiduiii Fig. 3. Amend dimension line for L froni bottoiii of thrcnd tim out tci top of thread run out as in Fig. I. AMD 2126 Amendment Slip No.2, published 29 October 1976 to British Standard A.226 : 1965 (Aerospace Series) Steel hexagon head
20、 bolts (Short thread: Class 3A) Revised text Foreword. in the list of reference standards delete 2S.103 Low nickel- chromium steel (wire only for the iiiaiiu facture of forged bolts). In the list, immediately before the entry for BS i 580, insert the following: 3.147 Nickel-cliromiuin-niolbdelitijn
21、steel (bar for the iiianutactiire 01 forged bolts only). S.148 I.ow nickel-clironiiuni steel (bar for the manufacture of forged bolts only). S. 149 1.75 per cent nickel-clironiiiiiii-iiiolybdenum steel. S. 1 54 2% %. nickel-chroiiiiuiii-iiiolybdenuiii steel billets, bars, forgings aiid parts (880 -
22、1 O80 hlPti: liiiiiting ruling section I50 nim). S.* 1 %a cliroriiium-nio!ybdeiiuiii steel bilis for the nianutacturc of forged bolts and lbrged nuts. Clause 3a. Ili item (i), ater S.117 aiid on ;i ncw liiie insert or S. 154. in ieni (ii) delete or S. 103. Alter S. 1 OS insert the following: or s. I47 or S. 148 or S. i 40 or S.* Ai the bolfoin of the page inseri the followiiig footnote: * Iii course of preparaiion. - 7610-2.4k-B Cr 0
