ASME B18.2.3.6M Metric Heavy Hex Bolts
Dimensions of Metric Heavy 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 | ||||
|---|---|---|---|---|---|---|---|---|---|
| Max | Min | Max | Min | Max | Min | Max | Min | Min | |
| M12 x 1.75 | 12.70 | 11.30 | 21.00 | 20.16 | 24.25 | 22.78 | 7.95 | 7.24 | 5.2 |
| M14 x 2 | 14.70 | 13.30 | 24.00 | 23.16 | 27.71 | 26.17 | 9.25 | 8.51 | 6.2 |
| M16 x 2 | 16.70 | 15.30 | 27.00 | 26.16 | 31.18 | 29.56 | 10.75 | 9.68 | 7.0 |
| M20 x 2.5 | 20.84 | 19.16 | 34.00 | 33.00 | 39.26 | 37.29 | 13.40 | 12.12 | 8.8 |
| M24 x 3 | 24.84 | 23.16 | 41.00 | 40.00 | 47.34 | 45.20 | 15.90 | 14.56 | 10.5 |
| M20 x 3.5 | 30.84 | 29.16 | 50.00 | 49.00 | 57.74 | 55.37 | 19.75 | 17.92 | 13.1 |
| M36 x 4 | 37.00 | 35.00 | 60.00 | 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.