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.