BRITISH STANDARD AEROSPACE SERIES BS 2A 229 1972 Incorporating Amendment Nos 1, 2 and 3 Specification for Hexagonal head steel bolts 1100 MPa UDC 629 7 621 882 211 669 14 BS 2A 229 1972 This British S[.]
BRITISH STANDARD AEROSPACE SERIES BS 2A 229:1972 Incorp orating Am endm ent Nos and Specification for Hexagonal head steel bolts 1100 MPa UD C 62 : 62 882 1 : 669 1, BS 2A 229:1972 This Britis h S tandard, having b een ap p roved b y the Aeros p ace I ndus try S tandards C ommittee and endors ed b y the C hairman of the E ngineering D ivis ional C ouncil, was p ub lis hed under the authority of the General C ouncil of Amendments issued since publication the I ns titution on S ep tem b er 72 Amd No D ate of is s ue 21 29 O ctob er 976 81 Ap ril 79 61 42 D ecemb er C omments © BS I - 00 The following BS I reference relates to the work on this s tandard: C om mittee reference AC E /1 D raft for ap p roval /3 45 ISBN 580 07085 99 Indicated b y a s ideline in the margin BS 2A 229:1972 Contents Page Scope General requirement Material and manufacture D imensions Screw threads Anti- corrosion treatment Identification and marking Appendix A O versize b olts Inside back cover Appendix B Table for the conversion of inches to millimetre equivalents Figure Figure 2 Figure 3 Figure Table — Bearing length © BSI 02 - 000 Inside back cover L and overall length E i BS A 2 9: 97 This revision of BS A229: 968 has been prepared to incorporate Amendment Slip No : 969 (AMD 95, ) and also to extend the size range to include /1 6–1 to 1 /4–1 UNJF bolts Dimensions for oversize bolts are given in Appendix A It provides a range of 1 00 MPa to 250 MPa steel bolts with UNJ profile threads and close tolerance shanks for aircraft use The lengths of the bolts are in fractional increments This standard requires reference to the following British Standards: Unified screw threads of “UNJ” basic profile BS A 00, General requirements for bolts and nuts of tensile strength not exceeding 250 MPa BS S 47, Nickel-chromium-molybdenum steel (bar for the manufacture of forged bolts only) BS S 48, Low nickel-chromium steel (bar for the manufacture of forged bolts only) BS S 49, 1.75 per cent nickel-chromium-molybdenum steel BS S , % chromium-molybdenum steel bars for the manufacture of forged bolts and forged nuts BS 4084, 1) NOTE The values in imperial units are to be regarded as the standard The table in Appendix A provides millimetre equivalents of inch dimensions and is based on the tables in BS 350, Conversion factors and tables” MPa = N/mm = MN/m = 45 lbf/in Information on SI units is given in BS 3763, “The International System of units (SI) ” “ NOTE 2 2 A British Standard does not purport to include all the necessary provisions of a contract Users of British Standards are responsible for their correct application C omp liance with a British S tand ard d oe s no t of itse lf confe r immunity from le gal ob ligatio ns S ummary of p age s This document comprises a front cover, an inside front cover, pages i and ii, pages to 0, an inside back cover and a back cover This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover 1) ii In course of preparation © BSI 02- 2000 BS 2A 229:1 972 Scope Dimensions This British Standard specifies the materials, 4.1 All bolts, after application of the ant-corrosion dimensions, finish and inspection requirements for coating, shall conform to the dimensions and cadmium plated steel bolts with hexagonal heads tolerances given in Table and Table or and Unified threads for aircraft use Appendix A 4.2 The run-out of the thread shall comply with the General requirement relevant requirements of BS A 100 The bolts shall be manufactured, inspected and 4.3 The nominal length of the bolt shall be the tested in accordance with the requirements of bearing length L BS A 100 4.4 Dimensions of oversize bolts are given in Appendix A Material and manufacture 3.1 The bolts shall be forged from material which complies with the latest issue of one of the following British Standards: BS S 147 or BS S 148 or BS S 149 or BS S 2) 3.2 In the finally heat-treated condition, the mechanical properties of the material used for forged bolts shall be as follows: 0.2 % proof stress not less than 965 MPa Tensile strength not less than 100 MPa Elongation on 5.65 Ỉ S0 not less than 10 % Screw threads The screw threads shall conform to the basic thread form, diameter and related pitches specified in BS 4084, “Unified screw threads of “UNJ” basic profile (Class 3A)” Anti-corrosion treatment All bolts shall be coated with cadmium, in accordance with the relevant requirements of BS A 100 Identification and marking The bolts shall be marked on the top face of the head with the number of this British Standard and the relevant part numbers shown in Table 2, e.g 2A 229E62 Oversize bolts shall be marked as state in Appendix A 2) In course of preparation © BSI 02-2000 0.2495 0.3120 0.3745 0.4370 0.4995 0.5615 0.6240 0.7490 0.8740 0.9990 1.1240 1.2490 0.2500 0.3125 0.3750 0.4375 0.5000 0.5625 0.6250 0.7500 0.8750 1.0000 1.1250 1.250 /4–28 /16–24 /8–24 /16–20 /2 –20 /16–18 /8–18 /4–16 /8–14 1–12 1 /4–12 1 /8–12 0.1895 0.1900 in Max A 1.2475 1.1225 0.9980 0.8730 0.7480 0.6230 0.5605 0.4985 0.4360 0.3735 0.3110 0.2485 0.1885 in Min portion of shank 10–32 in size of nominal equivalent UNJF size Diameter of plain Figure × in pitch 0.167 0.167 0.167 0.143 0.125 0.111 0.111 100 100 083 083 071 063 L and overall length E see Table Decimal For bearing length Nominal * 1.651 1.463 1.314 1.195 1.057 0.921 0.859 0.757 0.631 0.615 0.506 0.443 0.381 in only) (reference T 1.814 1.627 1.440 1.252 1.064 0.940 0.877 0.752 0.690 0.564 0.502 0.439 0.376 in Max B in Min 1.801 1.614 1.427 1.239 1.052 0.928 0.865 0.741 0.679 0.553 0.492 0.430 0.367 flats Figure 10 2.071 1.856 1.643 1.429 1.214 1.073 1.001 0.868 0.797 0.651 0.580 0.507 0.434 in Max in Min 2.055 1.842 1.628 1.414 1.200 1.059 0.987 0.845 0.775 0.631 0.561 0.491 0.419 C corners Width across 12 0.640 0.577 0.515 0.453 0.390 0.327 0.296 0.265 0.234 0.203 0.171 0.140 0.125 in Max in Min 0.625 0.562 0.500 0.438 0.375 0.312 0.281 0.250 0.219 0.188 0.156 0.125 0.110 D of head Thickness 11 14 0.075 0.070 0.060 0.050 0.045 0.040 0.035 0.030 0.030 0.025 0.025 0.025 0.025 in Max R 0.060 0.055 0.045 0.035 0.030 0.025 0.020 0.020 0.020 0.015 0.015 0.015 0.015 in Min bolt head G 1.114 0.990 0.865 0.754 0.640 0.524 0.462 0.406 0.344 0.292 0.229 0.174 0.120 in ± 0.010 chamfer of Diameter 15 Third angle projection Radius under 13 Alternative form of bolt head at the option of the bolt manufacturer Width across NOTE It is permissible to suitable chamfer the blank prior to thread rolling operation without any subsequent machining provided dia G and the max runout of thread at bolt end are maintained BS 2A 229:1 972 © BSI 02-2000 BS A 2 9: 97 Tab le — Be aring le ngth NO TE L and ove rall le ngth E Unallocated part numbers should not be used Figure Figure No –3 UNJF Part No ± L 0.01 in ± E Part 0.01 No ± L 0.01 in in /4 –2 UNJ F ± E Part 0.01 No in /1 6–2 UNJF ± L 0.01 in ± E 0.01 in D2 531 D3 88 594 E3 88 656 G3 88 71 D4 50 656 E4 50 71 G4 50 781 D5 31 71 E5 31 780 G5 31 843 D6 375 781 E6 375 843 G6 375 906 D7 438 844 E7 438 906 G7 438 969 D8 500 906 E8 500 968 G8 500 031 D9 562 968 E9 562 030 G9 562 093 D1 0 62 031 E1 0 62 093 G1 0 62 56 D1 688 094 E1 688 56 G1 688 219 D1 750 56 E1 750 218 G1 750 81 D1 81 21 E1 81 80 G1 81 343 D1 875 81 E1 875 343 G1 875 406 D1 938 344 E1 938 406 G1 938 469 D1 000 406 E1 000 468 G1 000 531 D1 062 468 E1 062 530 G1 062 593 D1 125 531 E1 125 593 G1 25 656 D1 88 594 E1 88 656 G1 88 71 D20 50 656 E20 50 71 G2 50 781 D21 31 71 E21 31 780 G2 1 31 843 D22 375 781 E22 375 843 G2 375 906 D23 438 844 E23 438 906 G2 438 969 D24 500 906 E24 500 968 G2 500 031 D25 562 968 E25 562 030 G2 562 093 D26 62 031 E26 62 093 G2 62 56 D27 688 094 E27 688 56 G2 688 21 D28 750 56 E28 750 21 G2 750 81 D29 81 2 21 E29 81 2 80 G2 81 2 343 D 30 875 81 E 30 875 343 G30 875 406 D 31 938 344 E 31 938 406 G31 938 469 © BSI 02 - 000 BS A 2 9: 97 Tab le — Be aring le ngth No –3 UNJ F P art No ± L 0.01 in ± E 0.01 Part No in L and o ve rall le ngth /4 –2 UNJ F ± L 0.01 in E ± E 0.01 Part No in /1 –2 UNJ F ± L 0.01 in ± E 0.01 in D 32 000 406 E32 000 468 G32 000 531 D 34 125 531 E34 25 593 G34 25 656 D 36 50 656 E36 50 71 G36 50 781 D 38 375 781 E38 375 843 G38 375 906 D 40 500 906 E40 500 968 G40 500 031 D 42 62 031 E42 62 093 G42 62 56 D 44 750 56 E44 750 G44 750 81 D 46 875 81 E46 875 343 G46 875 406 D 48 000 406 E48 000 468 G48 000 531 D 50 531 E50 593 G50 656 D 52 50 656 E52 50 71 G52 50 781 D 54 375 781 E54 375 843 G54 375 906 D 56 500 906 E56 500 968 G56 500 031 D 58 62 031 E58 62 093 G58 62 56 D 60 750 56 E60 750 G60 750 81 D 62 875 81 E62 875 343 G62 875 406 D 64 000 406 E64 000 468 G64 000 531 D 66 531 E66 593 G66 656 D 68 50 656 E68 50 71 G68 50 781 D 70 375 781 E70 375 843 G70 375 906 D 72 500 906 E72 500 968 G72 500 031 D 74 62 5 031 E74 62 5 093 G74 62 5 56 D 76 750 56 E76 750 G76 750 81 D 78 875 81 E78 875 343 G78 875 406 D 80 000 406 E80 000 468 G80 000 531 D 82 5 531 E82 5 593 G82 5 656 D 84 50 656 E84 50 71 G84 50 781 D 86 375 781 E86 375 843 G86 375 906 D 88 500 906 E88 500 968 G88 500 031 D 90 62 031 E90 62 093 G90 62 56 D 92 750 56 E92 750 G92 750 81 D 94 875 81 E94 875 343 G94 875 406 D 96 000 406 E96 000 468 G96 000 531 © BSI 02 - 000 BS A 2 9: 97 Tab le — Be aring le ngth NO TE L and o ve rall le ngth E Unallocated part numbers should not be used Figure 3 Part No Figure /8 –2 UNJ F ± L 0.01 in ± E Part 0.01 No ± L 0.01 in in /1 –2 UNJ F ± E Part 0.01 No /2 –2 UNJF ± L 0.01 in in ± E 0.01 in J4 50 891 L4 50 906 J5 31 954 L5 31 968 N5 31 094 J6 375 01 L6 375 031 N6 375 57 J7 438 079 L7 438 094 N7 438 220 J8 500 41 L8 500 56 N8 500 82 J9 562 03 L9 562 218 N9 562 334 J1 0 62 66 L1 0 62 81 N1 0 62 407 J1 688 32 L1 688 344 N1 688 470 J1 750 391 L1 750 406 N1 750 532 J1 81 453 L1 81 468 N1 81 594 J1 875 51 L1 875 531 N1 875 657 J1 938 579 L1 938 594 N1 938 72 J1 000 641 L1 000 656 N1 000 782 J1 062 703 L1 062 71 N1 062 844 J1 125 766 L1 125 781 N1 25 907 J1 88 82 L1 88 844 N1 88 970 J2 50 891 L2 50 906 N2 50 032 J2 1 31 953 L2 1 31 968 N2 1 31 2 094 J2 375 01 L2 375 031 N2 375 57 J2 438 079 L2 438 094 N2 438 220 J2 500 41 L2 500 56 N2 500 82 J2 562 03 L2 562 21 N2 562 344 J2 62 66 L2 62 81 N2 62 407 J2 688 32 L2 688 344 N2 688 470 J2 750 391 L2 750 406 N2 750 532 J2 81 2 453 L2 81 2 468 N2 81 2 594 J30 875 51 L30 875 531 N30 875 657 J31 938 579 L31 938 594 N31 938 72 © BSI 02 - 000 BS A 2 9: 97 Tab le — Be aring le ngth Part No /8 –2 UNJ F ± L 0.01 in ± E Part 0.01 No in L and o ve rall le ngth /1 –2 UNJ F ± L 0.01 in E ± E 0.01 Part No in /2 –2 UNJ F ± L 0.01 in ± E 0.01 in J32 000 641 L32 000 656 N32 000 782 J34 125 766 L34 25 781 N34 25 907 J36 50 891 L36 50 906 N36 50 032 J38 375 01 L38 375 031 N38 375 57 J40 500 41 L40 500 56 N40 500 82 J42 62 66 L42 62 81 N42 62 407 J44 750 391 L44 750 406 N44 750 532 J46 875 51 L46 875 531 N46 875 657 J48 000 641 L48 000 656 N48 000 782 J50 766 L50 781 N50 907 J52 50 891 L52 50 906 N52 50 032 J54 375 01 L54 375 031 N54 375 57 J56 500 41 L56 500 56 N56 500 82 J58 62 66 L58 62 81 N58 62 407 J60 750 391 L60 750 406 N60 750 532 J62 875 51 L62 875 531 N62 875 657 J64 000 641 L64 000 656 N64 000 782 J66 766 L66 781 N66 907 J68 50 891 L68 50 906 N68 50 032 J70 375 01 L70 375 031 N70 375 57 J72 500 41 L72 500 56 N72 500 82 J74 62 5 66 L74 62 5 81 N74 62 5 407 J76 750 391 L76 750 406 N76 750 532 J78 875 51 L78 875 531 N78 875 657 J80 000 641 L80 000 656 N80 000 782 J82 5 766 L82 5 781 N82 5 907 J84 50 891 L84 50 906 N84 50 032 J86 375 01 L86 375 031 N86 375 57 J88 500 41 L88 500 56 N88 500 82 J90 62 66 L90 62 81 N90 62 407 J92 750 391 L92 750 406 N92 750 532 J94 875 51 L94 875 531 N94 875 657 J96 000 641 L96 000 656 N96 000 782 © BSI 02 - 000 BS A 2 9: 97 Tab le — Be aring le ngth P art No ± L 0.01 ± L and o ve rall le ngth /1 –1 UNJ F E 0.01 in in P 31 96 P 375 P 43 P P Part No ± L 0.01 in ± E Part 0.01 No in ± L 0.01 in ± E /8 –1 UNJ F E 0.01 Part No ± L 0.01 in in ± E 0.01 in Q74 62 5 71 321 Q76 75 696 81 Q78 875 82 500 446 Q80 000 946 562 08 Q82 5 071 31 Q1 0 62 71 Q84 5 96 375 Q1 688 634 Q86 375 500 384 Q1 75 696 Q88 500 446 P90 62 509 Q1 81 758 Q90 62 71 P92 750 63 Q1 875 82 Q92 75 696 82 P94 875 75 Q1 93 884 Q94 875 82 1 000 884 P96 000 884 Q1 000 946 Q96 000 946 062 946 Q1 062 008 P1 125 009 Q1 1.125 071 P1 88 072 Q1 88 34 P2 250 34 Q2 250 96 P2 1 31 2 96 Q2 1 31 2 58 P2 375 259 Q2 375 321 P2 43 32 Q2 43 84 P2 500 384 Q2 500 446 P2 562 446 Q2 562 08 P2 62 509 Q2 62 71 P2 688 572 Q2 688 634 P2 75 63 Q2 75 696 P2 81 2 696 Q2 81 2 758 P3 875 75 Q3 875 82 P3 1 93 82 Q3 1 93 884 P3 2 000 884 Q3 2 000 946 P3 125 009 Q3 25 071 P3 250 34 Q3 250 96 P3 375 259 Q3 375 3 P40 500 384 Q40 500 446 P42 62 509 Q42 62 5 71 P44 75 63 Q44 75 696 P46 875 75 Q46 875 82 P48 000 884 Q48 000 940 P5 25 009 Q5 071 P5 250 31 Q5 96 P5 375 Q5 375 P5 500 384 Q5 500 446 P5 62 509 Q5 62 5 71 P60 75 63 Q60 75 696 P62 875 75 Q62 875 82 P64 000 884 Q64 000 946 P66 5 009 Q66 5 071 P68 5 31 Q68 5 96 P70 375 259 Q70 375 P72 500 384 Q72 500 446 P74 62 5 509 Q 31 58 259 P76 750 63 Q 375 32 P78 875 75 Q 43 500 382 P80 000 884 Q 562 446 P82 5 009 Q P1 0 62 51 P84 50 P1 688 572 P86 P1 75 63 P88 P1 81 642 P1 875 72 P1 93 P1 P1 © BSI 02 - 000 BS A 2 9: 97 Tab le — Be aring le ngth # P art No ± L 0.01 ± L and o ve rall le ngth + –1 UNJ F E 0.01 P art No ± L 0.01 ± E Part 0.01 No ± L 0.01 ± E –1 UNJ F E 0.01 Part No ± L 0.01 ± E 0.01 in in U74 62 5 845 95 U76 75 970 658 U78 875 005 00 72 U80 000 2 62 782 U82 25 45 32 U1 0 62 845 U84 250 470 375 457 U1 688 908 U86 75 95 500 82 U1 750 970 U88 00 72 S90 62 707 U1 81 2 032 U90 62 845 S92 75 832 U1 875 095 U92 75 970 02 S94 875 957 U1 938 03 U94 875 095 000 082 S96 000 082 U1 000 220 U96 000 2 062 44 U1 062 82 S1 125 07 U1 25 45 S1 88 70 U1 88 408 S2 250 332 U2 50 470 S2 1 31 2 394 U2 1 31 2 32 S2 375 457 U2 75 95 S2 43 52 U2 438 658 S2 500 582 U2 00 72 S2 562 644 U2 62 782 S2 62 707 U2 62 845 S2 688 770 U2 688 908 S2 75 832 U2 750 970 S2 81 2 894 U2 81 032 S3 875 957 U3 875 095 S3 1 93 02 U3 1 938 58 S3 2 000 082 U3 2 000 2 S3 125 07 U3 25 3 45 S3 250 332 U3 50 470 S3 375 457 U3 75 95 S40 500 582 U40 00 72 S42 62 707 U42 62 845 S44 75 832 U44 750 970 S46 875 957 U46 875 095 S48 000 082 U48 000 2 S5 25 07 U5 45 S5 250 332 U5 50 470 S5 375 457 U5 3 75 95 S5 500 582 U5 00 72 S5 62 707 U5 62 845 S60 75 832 U60 750 970 S62 875 957 U62 875 095 S64 000 082 U64 000 2 S66 5 07 U66 5 45 S68 5 332 U68 50 470 S70 375 457 U70 75 5 95 S72 500 582 U72 00 72 in in in in S74 62 5 707 U 32 457 S76 75 832 U 75 52 S78 875 957 U 438 500 582 S80 000 082 U 562 644 S82 25 07 U S1 0 62 707 S84 250 S1 688 770 S86 S1 75 832 S88 S1 81 894 S1 875 957 S1 93 S1 S1 in in S 31 394 S 375 S 43 S S © BSI 02 - 000 BS A 2 9: 97 Tab le — Be aring le ngth L and o ve rall le ngth –1 UNJF Part No ± L 0.01 ± E 0.01 Part No ( E ± L 0.01 ± E Part 0.01 No ± L 0.01 in ± E –1 UNJ F 0.01 Part No ± L 0.01 in in ± E 0.01 in in in W 651 W74 62 5 964 Y 800 Y74 62 1 W 75 71 W76 75 089 Y 75 863 Y76 750 W 438 777 W78 875 Y 438 92 Y78 875 63 W 00 839 W80 000 39 Y 00 988 Y80 000 488 W 62 901 W82 5 464 Y 62 050 Y82 5 61 W1 0 62 964 W84 5 89 Y1 0 62 2.1 13 Y84 50 73 W1 688 027 W86 375 71 Y1 688 76 Y86 75 863 W1 750 089 W88 500 839 Y1 750 38 Y88 5 00 988 W1 81 2 51 W90 62 964 Y1 81 2 00 Y90 62 1 W1 875 214 W92 75 089 Y1 875 63 Y92 750 W1 938 77 W94 875 Y1 938 42 Y94 875 63 W1 000 39 W96 000 39 Y1 000 488 Y96 000 488 W1 062 401 Y1 062 50 W1 25 464 Y1 25 61 W1 88 27 Y1 88 676 W2 50 89 Y2 50 738 W2 1 31 2 651 Y2 1 31 2 800 W2 75 71 Y2 75 863 W2 438 777 Y2 438 92 W2 00 839 Y2 00 988 W2 62 901 Y2 62 050 W2 62 964 Y2 62 1 W2 688 027 Y2 688 76 W2 750 089 Y2 750 38 W2 81 51 Y2 81 00 W3 875 Y3 875 63 W3 1 938 77 Y3 1 938 42 W3 2 000 3 39 Y3 2 000 488 W3 25 464 Y3 25 61 W3 50 89 Y3 50 738 W3 75 71 Y3 75 863 W40 00 839 Y40 00 988 W42 62 964 Y42 62 1 W44 750 089 Y44 750 38 W46 875 4 Y46 875 63 W48 000 39 Y48 000 488 W5 464 Y5 61 W5 50 89 Y5 50 738 W5 3 75 71 Y5 3 75 863 W5 00 839 Y5 00 988 W5 62 964 Y5 62 5 1 W60 750 089 Y60 750 38 W62 875 Y62 875 63 W64 000 39 Y64 000 488 W66 5 464 Y66 5 61 W68 50 5 89 Y68 50 738 W70 75 71 Y70 75 863 W72 00 839 Y72 00 988 in © BSI 02 - 000 in BS A 2 9: 97 Tab le — Be aring le ngth ! E Part No ± L 0.01 in ± L and ove rall le ngth E –1 UNJ F Part 0.01 No ± L 0.01 in in ± E 0.01 in Z 988 Z74 62 301 Z 75 05 Z76 750 42 Z 438 2.1 Z78 875 551 Z 00 76 Z80 000 676 Z 62 238 Z82 5 801 Z1 0 62 01 Z84 50 92 Z1 688 64 Z86 75 051 Z1 750 42 Z88 5 00 76 Z1 81 2 488 Z90 62 301 Z1 875 551 Z92 750 42 Z1 938 61 Z94 875 551 Z1 000 676 Z96 000 676 Z1 062 73 Z1 25 801 Z1 88 864 Z2 50 92 Z2 1 31 2 988 Z2 75 05 Z2 438 1 Z2 00 76 Z2 62 238 Z2 62 01 Z2 688 64 Z2 750 42 Z2 81 488 Z3 875 551 Z3 1 938 61 Z3 2 000 676 Z3 25 801 Z3 90 92 Z3 75 05 Z40 90 76 Z42 62 01 Z44 790 42 Z46 875 5 Z48 000 676 Z5 801 Z5 50 92 Z5 3 75 05 Z5 90 76 Z5 62 5 01 Z60 750 42 Z62 875 551 Z64 000 676 Z66 5 801 Z68 50 92 Z70 75 05 Z72 00 76 10 © BSI 02 - 000 BS 2A 229:1 972 Appendix A Oversize bolts Nominal Size UNJF Decimal equivalent A (Plain shank dia.) First oversize (X) Second oversize (Y) Maximum Minimum Maximum Minimum Maximum Minimum 0–32 900 895 885 2026 201 21 82 21 72 /4 2500 2495 2485 2651 2641 2808 2798 /1 31 25 31 20 31 0 3276 3266 3433 3423 /8 3750 3745 3735 3901 3891 4058 4048 /1 4375 4370 4360 4526 451 4683 4673 /2 5000 4995 4985 51 51 51 41 5308 5298 /1 5625 561 5605 5771 5761 5928 591 /8 6250 6240 6230 6396 6386 6553 6543 /4 7500 7490 7480 7646 7636 7803 7793 /8 8750 8740 8730 8896 8886 9053 9043 1.0 0000 9990 9980 01 46 01 36 0303 0293 1 250 240 225 396 381 553 538 1 2500 2471 2475 2646 2631 2803 2788 /8 –1 /4 –1 Examples of part numbers for identification of bolts: Appendix B Table for the conversion of inches to millimetre equivalents in mm 25 50 76 01 27 52 77 8 203 228 10 254 © BSI 02- 2000 BS 2A 229:1972 BSI — British Standards Institution BS I is the indep endent national b ody res p ons ib le for p rep aring Britis h S tandards It p res ents the UK view on s tandards in E urop e and at the international level It is incorp orated b y Royal C harter Revisions Britis h S tandards are up dated b y amendment or revis ion Us ers of Britis h S tandards should make s ure that they p oss es s the latest amendments or editions It is the constant aim of BS I to imp rove the quality of our p roducts and services We would b e grateful if anyone finding an inaccuracy or amb iguity while us ing this Britis h S tandard would inform the S ecretary of the technical committee res p ons ib le, the identity of which can b e found on the inside front cover Tel: 02 89 96 90 00 Fax: 02 89 96 40 BS I offers memb ers an individual up dating s ervice called PLUS which ens ures that s ub s crib ers automatically receive the lates t editions of s tandards Buying standards O rders for all BS I, international and foreign s tandards p ub lications s hould b e addres s ed to C us tomer S ervices Tel: 899 00 Fax: 899 7001 In res p ons e to orders for international standards , it is BS I p olicy to sup p ly the BS I imp lementation of thos e that have b een p ub lis hed as Britis h S tandards, unless otherwis e requested Information on standards BS I p rovides a wide range of information on national, E urop ean and international standards through its Lib rary and its Technical H elp to E xp orters S ervice Various BS I electronic information s ervices are also availab le which give details on all its p roducts and s ervices C ontact the Information C entre Tel: 02 89 96 71 1 Fax: 02 89 96 048 S ub s crib ing memb ers of BS I are kep t up to date with s tandards develop ments and receive sub s tantial discounts on the p urchase p rice of s tandards For details of thes e and other b enefits contact Memb ership Adminis tration Tel: 02 89 96 70 02 Fax: 02 89 96 00 Copyright C op yright s ub s is ts in all BS I p ub lications BS I als o holds the cop yright, in the UK, of the p ub lications of the international s tandardization b odies E xcep t as p ermitted under the C op yright, D es igns and Patents Act 988 no extract may b e rep roduced, s tored in a retrieval s ystem or transmitted in any form or b y any means – electronic, p hotocop ying, recording or otherwis e – without p rior written p ermis s ion from BS I This does not p reclude the free us e, in the cours e of imp lementing the standard, of necess ary details such as s ymb ols, and size, typ e or grade designations If thes e details are to b e used for any other p urp os e than imp lementation then the p rior written p ermiss ion of BS I must b e ob tained If p ermis sion is granted, the terms may include royalty p ayments or a licensing agreement D etails and advice can b e ob tained from the C op yright Manager BS I 89 C his wick H igh Road London W4 4AL Tel: 02 89 96 70