ISO 4017 Hexagon head screws – Basic dimensions
Selected sizes used for CE Marking under EN 15048
| Dimension (d) |
M12 |
M16 |
M20 |
M22 |
M24 |
M27 |
M30 |
M33 |
M36 |
| Thread pitch (P) |
1.75 |
2 |
2.5 |
2.5 |
3 |
3 |
3.5 |
3.5 |
4 |
| k (nom) |
7.5 |
10 |
12.5 |
14 |
15 |
17 |
18.7 |
21 |
22.5 |
| k (Grade A) |
7.32-7.68 |
9.82-10.18 |
12.285-12.715 |
13.785-14.215 |
14.785-15.215 |
– |
– |
– |
– |
| k (Grade B) |
7.21-7.79 |
9.71-10.29 |
12.15-12.85 |
13.65-14.35 |
14.65-15.35 |
16.65-17.35 |
18.28-19.12 |
20.58-21.42 |
22.08-22.92 |
| s (nom) |
18 |
24 |
30 |
34 |
36 |
41 |
46 |
50 |
55 |
| s (min, Grade A) |
17.73 |
23.67 |
29.67 |
33.38 |
35.38 |
– |
– |
– |
– |
| s (min, Grade B) |
17.57 |
23.16 |
29.16 |
33.00 |
35.00 |
40.00 |
45.00 |
49.00 |
63.10 |
| e (min, Grade A) |
20.03 |
26.75 |
33.53 |
37.72 |
39.98 |
– |
– |
– |
– |
| e (min, Grade B) |
19.85 |
26.17 |
32.95 |
37.29 |
39.55 |
45.20 |
50.85 |
55.37 |
60.79 |
Dimensions in milimeters
| Size |
Grade A |
Grade B |
| M12 (l) |
Up and including 120 |
Including and above 125 |
| M16 (l) |
Up and including 150 |
Including and above 155 |
| M20 (l) |
Up and including 150 |
Including and above 155 |
| M22 (l) |
Up and including 150 |
Including and above 155 |
| M24 (l) |
Up and including 150 |
Including and above 155 |
| M27 (l) |
– |
All lengths |
| M30 (l) |
– |
All lengths |
| M33 (l) |
– |
All lengths |
| M36 (l) |
– |
All lengths |
Wednesday, 27th April 2016
Dariusz
