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ASME B18.2.3.5M Metric Hex Bolts

ASME B18.2.3.5M Metric Hex Bolts

Dimensions of Metric Hex Bolts

Nominal Bolt Diameter, D, and Thread Pitch Body Diameter Ds Width Across Flats, S Width Across Corners, E Head Height, K Wrenching Height, K1, Min For Bolt Lengths
Basic Thread Length, a B
Max Min Max Min Max Min Max Min < 125mm > 125 and < 200mm > 200mm
M5 x 0.8 5.48 4.52 8.00 7.64 9.24 8.63 3.58 3.35 2.4 16 22 35
M6 x 1 6.19 5.52 10.00 9.64 11.55 10.89 4.38 3.55 2.8 18 24 37
M8 x 1.25 8.58 7.42 13.00 12.57 15.01 14.20 5.68 5.10 3.7 22 28 41
aM10 x 1.5 10.58 9.42 15.00 14.57 17.32 16.46 6.85 6.17 4.5 26 32 45
M10 x 1.5 10.58 9.42 16.00 15.57 18.48 17.59 6.85 6.17 4.5 26 32 45
M12 x 1.75 12.70 11.30 18.00 17.57 20.78 19.85 7.95 7.24 5.2 30 36 49
M14 x 2 14.70 13.30 21.00 20.16 24.25 22.78 9.25 8.51 6.2 34 40 53
M16 x 2 16.70 15.30 24.00 23.16 27.71 26.17 10.75 9.68 7.0 38 44 57
M20 x 2.5 20.84 19.16 30.00 29.16 34.64 32.95 13.40 12.12 8.8 46 52 65
M24 x 3 24.84 23.16 36.00 35.00 41.57 39.55 15.90 14.56 10.5 54 60 73
M30 x 3.5 30.84 29.16 46.00 45.00 5312 50.55 19.78 17.92 13.1 66 72 85
M36 x 4 37.00 35.00 55.00 53.80 63.51 60.79 23.55 21.72 15.8 78 84 97
M42 x 4.5 43.00 41.00 65.00 62.90 75.06 71.71 27.05 25.03 18.2 90 96 109
M48 x 5 49.00 47.00 75.00 72.60 86.60 82.76 31.07 28.93 21.0 102 108 121
M56 x 5.5 57.20 54.80 85.00 82.20 98.15 93.71 36.20 33.80 24.5 -- 124 137
M64 x 6 65.52 62.80 95.00 91.80 109.70 104.65 41.32 38.68 28.0 -- 140 153
M72 x 6 73.84 70.80 105.00 101.40 121.24 115.60 46.45 43.55 31.5 -- 156 169
M80 x 6 82.16 78.80 115.00 111.00 132.79 126.54 51.58 48.42 35.0 -- 172 185
M90 x 6 92.48 88.60 130.00 125.50 150.11 143.07 57.74 54.26 39.2 -- 192 205
M100 x 6 102.80 98.60 145.00 140.00 167.43 159.60 63.90 60.10 43.4 -- 212 225
  • aBasic thread length, B, is a reference dimension.
  • bThis size with width across flats of 15 mm is not standard. Unless specifically ordered, M10 hex bolts with 16mm width across flats will be furnished.