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This standard covers the complete general and dimensional data for metric heavy hex bolts recognized as“American National Standard." ISO has not yet initiated development of an ISO standard for heavy hex bolts. However,nominal diameters and thread pitches, body diameters, widths across flats,head heights,thread lengths,thread dimensions and nominal lengths are in accord with ISo standards for related hex screws and bolts.
Heavy Hex Bolts, Heavy Hex Structural Bolts
Heavy Hex Bolts are similar to hex head bolts but with large width across flats and thickness. Heavy hex bolts are mostly produce in high tensile, material grades and specifications, for use in high strength structural applications. Heavy hex head bolt dimensions are defined in both metric and imperials sizes with unified national coarse pitch (UNC), fine pitch (UNF), fixed pitch (UN) and iso metric thread profile.
Nominal Bolt Diameter, D, and Thread Pitch | Body Diameter Ds | Width Across Flats, S | Width Across Corners, E | Head Height, K | Wrenching Height, K1 | ||||
Max | Min | Max | Min | Max | Min | Max | Min | Min | |
M12 x 1.75 | 12.70 | 11.30 | 21 | 20.16 | 24.25 | 22.78 | 7.95 | 7.24 | 5.2 |
M14 x 2 | 14.70 | 13.30 | 24 | 23.16 | 27.71 | 26.17 | 9.25 | 8.51 | 6.2 |
M16 x 2 | 16.70 | 15.30 | 27 | 26.16 | 31.18 | 29.56 | 10.75 | 9.68 | 7.0 |
M20 x 2.5 | 20.84 | 19.16 | 34 | 33.00 | 39.26 | 37.29 | 13.40 | 12.12 | 8.8 |
M24 x 3 | 24.84 | 23.16 | 41 | 40.00 | 47.34 | 45.20 | 15.90 | 14.56 | 10.5 |
M20 x 3.5 | 30.84 | 29.16 | 50 | 49.00 | 57.74 | 55.37 | 19.75 | 17.92 | 13.1 |
M36 x 4 | 37.00 | 35.00 | 60 | 58.80 | 69.28 | 66.44 | 23.55 | 21.72 | 15.8 |
All dimensions are in millimeters.
Basic thread lengths, B, are same as given in table 12 of ASME B18.2.3.6M.
For additional manufacturing and acceptance specification, reference should be made to ASME B18.2.3.6M-1979, R1989 standard.