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ASME B18.2.3.7M Metric Heavy Hex Structural Bolts

ASME B18.2.3.7M Metric Heavy Hex Structural Bolts

Dimensions of Metric Heavy Hex Structural Bolts

Diameter, D, and Thread Pitch Body Diameter Ds Width Across Flats, S Width Across Corners, E Head Height, K Wrenching Height, K1, Min Washer Face Diameter, Dw, Min Washer Face Thickness, C Thread Length, B, Basic Transition Thread Length, Xo, Max
Max Min Max Min Max Min Max Min Max Min Length ≤ 100 Length > 100
M16 x 2 16.70 15.30 27.00 26.16 31.18 29.56 10.75 9.25 6.5 24.9 0.8 0.4 31 38 6.0
M20 x 2.5 20.84 19.16 34.00 33.00 39.26 37.29 13.40 11.60 8.1 31.4 0.8 0.4 36 43 7.5
M22 x 2.5 22.84 21.16 36.00 35.00 41.57 39.55 14.90 13.10 9.2 33.3 0.8 0.4 38 45 7.5
M24 x 3 24.84 23.16 41.00 40.00 47.34 45.20 15.90 14.10 9.9 38.0 0.8 0.4 41 48 9.0
M27 x 3 27.84 26.16 46.00 45.00 53.12 50.85 17.90 16.10 11.3 42.8 0.8 0.4 44 51 9.0
M30 x 3.5 30.84 29.16 50.00 49.00 57.74 55.37 19.75 17.65 12.4 46.5 0.8 0.4 49 56 10.5
M36 x 4 37.00 35.00 60.00 58.80 69.28 66.44 23.55 21.45 15.0 55.9 0.8 0.4 56 63 12.0
  • aBasic thread length, B, is a reference dimension.
  • bTransition thread length, X, includes the length of incomplete threads and tolerances on grip gaging length and body length. It is intended for calculation purposes.
  • All dimensions are in millimeters.
  • For additional manufacturing and acceptance specifications, reference should be made to the ANSIB18.2.3.7M-1979, R1995 standard.