1、UDC 629.13.01 : 621.882.215.2:669.14 A.227, December, 1965 BRITISH STANDARDS INSTITUTION MCoRPORATED BY Telephone: MAYFAIR 9ooo Tele.Qrams: STANDARDS LONDON WI BRITISH STANDARDS HOUSE, 2 PARK STREET, LONDON, W.1 BRITISH STANDARD SPECIFICATION FOR STEEL PAN HEAD BOLTS (Short Thread : Class 3A) FOREWO
2、RD In this British Standard the bolt lengths are based upon fractional increments. Reference is made in the standard to the following British Standards: A.100. Bolts and nuts for aircraft (general clauses). 2s. 95, 1% per cent nickel-chromium-molybdenum steel (55/65 tonf/sq in). 2s. 96, 2% per cent
3、nickelihromium-molybdenum steel (55/65 tonflsq in). 2S.102. Carbon-molybdenum steel (wire only for the manufacture of forged bolts). 2S.105. Carbon steel (wire only for the manufacture of forged bolts not exceeding , in shank diameter). 2s. 114. Manganese-molybdenum steel (55/65 tonf/sq in). 2S.116.
4、 40 c*+r? steel bright bars for machining (55/65 tonfjsq in). 2S.il7. 1 per cetin: (IO? kgf!mm* issue of one of the following British Standards: A (68 kgf!mm*) (8 7 k grnm 2) Elongation on 5-65 1 So: not less than 13 per cent lzod impact value: not less than 40 ft Ib (6 kgf in) A Prire 4.- tiel. A.2
5、27, December, 1965 DIME!WOSS IDE%TIRCATIOS AND MARKISC 4. a. All finished bolts, after the application of the anti- corrosion coating. shall conform to thc dimensions and tolerances given in Tables I and t. b. The runout of thread shall be as defined in SBAC publication R.S. 678.+ length L. 7. The B
6、ritish Standard number and part number need not be applied on the holis. but shall be clearly marked on the labels of parcels of bolts. L%SPCrlOh PROCEDL HE 8, The bolts shall be inspected in accordance with itic C. The nonlinal length Of thc boit shall be the bearing relcviint requirements of Briti
7、sh Standard .4.100, Part 2. SCREV THREADS 5. The bolts shall have Unified threads of the form specified in B.S. 1580 Pari 3 and shall conform to the Class 3A limits and tolerances specified therein. ANTI-CORROSION TREAWNT 6. All finished bolts shall be coated with cadmium. BSI A5227 b5 W 1624bb9 010
8、3159 b = A.227, December, 1965 fi L *-Q 4 U 8 .- . .i E i . . . . O gb- ooz .- . . . _ 883 000 000 I A.227, December, 1965 TABLE 2. BEARING LENGTH L AND OVERALL LENGTH E Fig. 2. i Part *L E Part L E Part *L E Part L E NO. fO.010 :t0.015 NO. -i c32 -. 0,125 0.529 0.188 . 0,592 00312 0-716 0.375 0.779
9、 0.438 0.842 0.500 : 0.904 0.562 , 0.966 0625 1Q29 0.250 : 0654 0.688 0.750 0.812 0.875 0.938 1 ooo 1.125 1,250 1.375 1 *o92 1-154 1.216 1.279 1,342 1,404 1.529 1 654 1.779 in D 1 0.062 D 2 0.125 D 3 0-188 D 4 0.250 D 5 0,312 D 6 0.375 D 7 0.438 D 8 * 0.500 D 9 0.562 Dl0 0.625 D11 0688 D12 . 0.750 D
10、13 , 0-812 D14 0,875 D15 0-938 D16 . 1*oOO D18 1.125 D20 1.250 D22 1.375 1.500 1.904 j D24 i 1.500 1,750 ! 2.154 . D28 1.750 1.875 . 2.279 D30 1.875 2.000 2.404 D32 2,000 2,125 i 2.529 D34 2,125 1.625 2,029 . D26 . 1.625 in 0.466 0.529 0,592 0654 0.716 0.779 0.842 0.904 0.966 1 -029 1 *o92 1.154 1.2
11、16 1.279 1.342 1.404 1-529 1,654 1,779 1.904 2.029 2-154 2,279 2,404 2.529 2,654 - 834 2.125 ; 2.482 i c34 B36 2.250 2,607 C36 2.250 2,654 . D36 2250 - 838 2.375 2.732 C38 2.375 2.779 D38 2.375 2,779 840 842 B44 B46 B48 850 B52 54 B56 058 B60 862 2.500 2.625 2.750 2.875 3*000 3.125 3,250 3.375 3.500
12、 3.625 3.750 3.875 2-857 2.982 3.107 3.232 3-357 3.482 3607 3.732 3.857 3.982 4.107 4.232 C40 C42 c44 C46 C48 C50 c52 c54 C56 C58 C60 C62 2,500 2625 2.750 2.875 3-000 3,125 3.250 3.375 3.500 3625 3,750 3.875 2.904 3.029 3.154 3.279 3 404 3.529 3654 3.779 3,904 4,029 4,154 4.279 D40 D42 D44 . D46 D48
13、 D59 D52 D54 D56 D58 D60 D62 - 2.500 2.904 2.625 3.029 2.750 3.154 2.875 3.279 3 o00 3.404 3.125 3.529 3.250 3654 3.375 3.779 3.500 3.904 5625 4.029 3.750 4-154 3,875 4.279 Scc Subclause 4r YOTE. Bolts bclow tlic Iicavy line may not bc rcadily available in Iiirgc quantitics becaiisc of liniiiaiions
14、in iiianihciurc by orging. A.227, Deceinber, I965 APPENDIX TABLE FOR CONVERSION OF INCHES TO APPROXIMATE MILLIMETRE EQUIVALENTS in mm 1 25.4 2 50.8 3 76.2 4 101.6 5 127.0 6 152.4 7 177.8 8 : 203.2 9 , 228.6 10 i 254.0 This British Standard, having been approved by the Aircraft Industry Standards Com
15、mittee and endorsed by the Chairinari of the Engineering Divisional Council, was published under the 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 provi
16、sioiis necessary for the supply of the material herein referred to, but does not purport to comprise ali the necessary provisions of a contract. British Standards are revised$ wlieri riecessary, by llre ssirc cillier of anierrdntcrit slips or of revised dtiolrs. II i.,. inportarit tliat iiws of Brit
17、ish Standards shld ascertain Ilia! tliiy tire irr posscssiori of rlie lrrest ontct1dItiptits or tcii(/otts. The following .S.1. rcfercnces rclalc to ihc work on this standard: Coniniiticc rccrcncc ACE/I2. Drnft for comment D63/11889. Prlnrrd in Enrlrin London, S.E.14. AMD 2 I27 Amendment Slip No. 1,
18、 published 29 October 1976 to British Standard A.227 : 1965 (Aerospace Series) Steel pan head bolts (Short thread: Class 31. : Revised text Foreword. In the list of reference standards delete 2S.103, Low nickel- chromium steel (wire only for the manufacture of forged bolts). In the list, immediately
19、 before the entry for BS 1550, insert the following: S. 147 Nickel-chromium-molybdenum steel (bar for the manufacture o forged bolts only). S.148 Low nickel-chromium steel (bar for the manufacture of forged bolts only). S.149 1.75 per cent nickel-cliromium-molybdenum steel. S. I 54 2% % nickel-chrom
20、ium-molybdenum steel billets, bars, forgings and parts (880 - 1080 MPa: limiting ruling section I50 mm). . S . f I “/o chromiuni-inolybdenuin steel bars for the manufacture of forged bolts and forged nuts. Clause 3a. In item (i) after S.1 17 and on a new line insert or S.154. In item (i) delete or S.103. After S.105 insert the following: or S. I47 or S.148 or S.149 or S At the bottom of the page insert the following footnote: + In course of prepiration. 7610-2.4k-0 Gr O
