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ASME B18.2.3.3M Metric Heavy Hex Screws

ASME B18.2.3.3M Metric Heavy Hex Screws

Dimensions of Metric Heavy Hex Screws

Nominal Screw Diameter, D, and Thread Pitch Body Diameter Ds, Width Across Flats, S Width Across Corners, E Head Height, K Wrenching Height, K1 Washer Face Thickness, C Washer Face Diameter, Dw
Max Min Max Min Max Min Max Min Min Max Min Max
M12 x 1.75 12.00 11.73 21.00 20.67 24.25 23.35 7.76 7.24 5.2 0.6 0.3 19.6
M14 x 2 14.00 13.73 24.00 23.67 27.71 26.75 9.09 8.51 6.2 0.6 0.3 22.5
M16 x 2 16.00 15.73 27.00 26.67 31.18 30.14 10.32 9.68 7.0 0.8 0.4 25.3
M20 x 2.5 20.00 19.67 34.00 33.00 39.26 37.29 12.88 12.12 8.8 0.8 0.4 31.4
M24 x 3 24.00 23.67 41.00 40.00 47.34 45.20 15.44 14.56 10.5 0.8 0.4 38.0
M30 x 3.5 30.00 29.67 50.00 49.00 57.74 55.37 19.48 17.92 13.1 0.8 0.4 46.6
M36 x 4 36.00 35.61 60.00 58.80 69.28 66.44 23.38 21.72 15.8 0.8 0.4 55.9
  • All dimensions are in millimeters.
  • Basic thread lengths, B, are the same as given in table 12.
  • Transition Thread length X, includes the length of incomplete threads and tolerances on grip gaging length and body length. It is intended for calculation puposes
  • For additional manufacturing and acceptance specifications, reference should be made to the standard.