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BS 3692 Hexagon Head Bolts

BS 3692 : Hexagon Head Bolts

Dimensions of Hexagon Head Bolts

Thread Diameter, A, mm Pitch Of Thread Dia of Shank Unthreaded, mm Width Across Flats, E, mm Width Across Corners, F, mm Height of Head, D, mm Radius Under Head, mm
Coarse Pitch Series Min Max Min Max Min Max Min Max Min Max
M5 0.8 4.82 5.0 7.85 8.0 8.87 9.2 3.35 3.65 0.2 0.35
M6 1 5.82 6.0 9.78 10.0 11.05 11.5 3.85 4.15 0.25 0.4
M8 1.25 7.78 8.0 12.73 13.0 14.38 15.0 5.35 5.65 0.4 0.6
M10 1.5 9.78 10.0 16.73 17.0 18.90 19.6 6.82 7.18 0.4 0.6
M12 1.75 11.73 12.0 18.67 19.0 21.10 21.9 7.82 8.18 0.6 1.1
M14 2 13.73 14.0 21.67 22.0 24.49 25.4 8.82 9.18 0.6 1.1
M16 2 15.73 16.0 23.67 24.0 26.75 27.7 9.82 10.18 0.6 1.1
M18 2.5 17.73 18.0 26.67 27.0 30.14 31.2 11.785 12.215 0.6 1.1
M20 2.5 19.67 20.0 29.67 30.0 33.53 34.6 12.785 13.215 0.8 1.2
M22 2.5 21.67 22.0 31.61 32.0 35.72 36.9 13.785 14.215 0.8 1.2
M24 3 23.67 24.0 35.38 36.0 39.98 41.6 14.785 15.215 0.8 1.2
M27 3 26.67 27.0 40.38 41.0 45.63 47.3 16.785 17.215 1.0 1.7
M30 3.5 29.67 30.0 45.38 46.0 51.28 53.1 18.74 19.26 1.0 1.7
M33 3.5 32.61 33.0 49.38 50.0 55.80 57.7 20.74 21.26 1.0 1.7
M36 4 35.61 36.0 54.26 55.0 61.31 63.5 22.74 23.26 1.0 1.7
M39 4 38.61 39.0 59.26 60.0 66.96 69.3 24.74 25.26 1.0 1.7
M42 4.5 41.61 42.0 64.26 65.0 72.61 75.1 25.74 26.26 1.2 1.8
M45 4.5 44.61 45.0 69.26 70.0 78.26 80.8 27.74 28.26 1.2 1.8
M48 5 47.61 48.0 74.26 75.0 83.91 86.6 29.74 30.26 1.6 2.3
M52 5 51.54 52.0 79.26 80.0 89.56 92.4 32.69 33.31 1.6 2.3
M56 5.5 55.54 56.0 84.13 85.0 95.07 98.1 34.69 35.31 2.0 3.5
M60 5.5 59.54 60.0 89.13 90.0 100.72 103.9 37.69 38.31 2.0 3.5
M64 6 63.54 64.0 94.13 95.0 106.37 109.7 39.69 40.31 2.0 3.5
M68 6 67.54 68.0 99.13 100.0 112.02 115.5 42.69 43.31 2.0 3.5

Mechanical Properties for BS 3692 Standard Hexagon Head Bolts

Mechanical Property Tensile strength Rm Brinell hardness Rock well hardness Vickers hardness HV30 Yield stress Re Sress at permanent set limit R02 Stress under proof load Sp Elongation A after fracture Strength under wedge loading Charpy Impact Strength Head soundness Decarburization at root of thread Non-decarburized zone
Strength Grade Designation min max min max min max min max min min min
kgf/mm2 N/mm2 kgf/mm2 N/mm2 HB HB HRB HRC HRB HRC kgf/mm2 N/mm2 kgf/mm2 N/mm2 Sp/Re kgf/mm2 N/mm2 min. percent kgfm/cm2 ft lbf
4.6 40 392 55 539 110 170 62 - 88 - 110 170 24 235 - - 0.94 22.6 222 25 See Note 3 for all - - No Fracture (See Note 4) Depth Not More than 1/10 of H1 Depth Not less than 2/3 of H1
4.8 40 392 55 539 110 170 62 - 88 - 110 170 32 214 - - 0.91 29.1 286 14 - -
5.6 50 490 70 686 140 215 77 - 97 - 140 215 30 294 - - 0.94 28.2 276 20 - -
5.8 50 490 70 686 140 215 77 - 97 - 140 215 40 392 - - 0.91 36.4 357 10 - -
6.6 60 588 80 785 170 245 88 - 102 - 170 245 36 353 - - 0.94 33.9 333 16 - -
6.8 60 588 80 785 170 245 88 - 102 - 170 245 48 471 - - 0.91 43.7 429 8 - -
8.8 80 785 100 981 225 300 - 18 - 31 225 300 - - 64 628 0.91 58.2 571 12 6 22
10.9 100 981 120 1177 280 365 - 27 - 38 280 370 - - 90 883 0.88 79.2 777 9 4 14
12.9 120 117 140 1373 330 425 - 34 - 44 330 440 - - 108 1059 0.88 95.0 932 8 3 11
14.9 140 1373 160 1569 390 - - 40 - 49 400 510 - - 126 1236 0.88 111 1089 7 3 11

Notes

  • Only for full size bolts.
  • The allowed permanent extensions is 12.5 micrometres.
  • The fracture should not take place immediately under head of the bolt.
  • Where screws are threaded up to the head this property will be regarded as established even if a crack should be appear in the first thread, provided that the head does not snap off.