Equivalent Standards
DIN 931 Hex Bolt Dimensions
| Size |
Width Across Flat (s) |
Head Height (k) |
Thread Length |
| DIN 931 |
ISO 4014 |
DIN 931 |
ISO 4014 |
DIN 931 Length (in MM) |
ISO 4014 Length (in MM) |
| Min |
Max |
Min |
Max |
Min |
Max |
Min |
Max |
≥125 |
>125≥200 |
≥200 |
≥125 |
>125≥200 |
≥200 |
| M2 |
3.82 |
4.00 |
3.82 |
4.00 |
1.28 |
1.52 |
1.275 |
1.525 |
10 |
- |
- |
10 |
- |
- |
| M3 |
5.32 |
5.50 |
5.32 |
5.50 |
1.88 |
2.12 |
1.875 |
2.125 |
12 |
- |
- |
12 |
- |
- |
| M4 |
6.78 |
7.00 |
6.78 |
7.00 |
2.68 |
2.92 |
2.675 |
2.925 |
14 |
- |
- |
14 |
- |
- |
| M5 |
7.78 |
8.00 |
7.78 |
8.00 |
3.35 |
3.65 |
3.35 |
3.65 |
16 |
22 |
- |
16 |
- |
- |
| M6 |
9.78 |
10.00 |
9.78 |
10.00 |
3.85 |
4.15 |
3.85 |
4.15 |
18 |
24 |
- |
18 |
- |
- |
| M8 |
12.73 |
13.00 |
12.73 |
13.00 |
5.15 |
5.45 |
5.15 |
5.45 |
22 |
28 |
41 |
22 |
- |
- |
| M10 |
16.73 |
17.00 |
15.73 |
16.00 |
6.22 |
6.58 |
6.22 |
6.58 |
26 |
32 |
45 |
26 |
- |
- |
| M12 |
18.67 |
19.00 |
17.73 |
18.00 |
7.32 |
7.68 |
7.32 |
7.68 |
30 |
36 |
49 |
30 |
- |
- |
| M14 |
21.67 |
22.00 |
20.67 |
21.00 |
8.62 |
8.98 |
8.62 |
8.98 |
34 |
40 |
53 |
34 |
40 |
- |
| M16 |
23.67 |
24.00 |
23.67 |
24.00 |
9.82 |
10.2 |
9.82 |
10.18 |
38 |
44 |
57 |
38 |
44 |
- |
| M18 |
26.67 |
27.00 |
26.67 |
27.00 |
11.28 |
11.7 |
11.285 |
11.715 |
42 |
48 |
61 |
42 |
48 |
- |
| M20 |
29.67 |
30.00 |
29.67 |
30.00 |
12.28 |
12.7 |
12.285 |
12.715 |
46 |
52 |
65 |
46 |
52 |
- |
| M22 |
31.61 |
32.00 |
33.38 |
34.00 |
13.78 |
14.2 |
13.785 |
14.215 |
50 |
56 |
69 |
50 |
56 |
69 |
| M24 |
35.38 |
36.00 |
35.38 |
36.00 |
14.78 |
15.2 |
14.785 |
15.215 |
54 |
60 |
73 |
54 |
60 |
73 |
| M27 |
40.00 |
41.00 |
40.00 |
41.00 |
16.65 |
17.4 |
16.65 |
17.35 |
60 |
66 |
79 |
60 |
66 |
79 |
| M30 |
45.00 |
46.00 |
45.00 |
46.00 |
18.28 |
19.1 |
18.28 |
19.12 |
66 |
72 |
85 |
66 |
72 |
85 |
| M33 |
49.00 |
50.00 |
49.00 |
50.00 |
20.58 |
21.4 |
20.58 |
21.42 |
72 |
78 |
91 |
- |
78 |
91 |
| M36 |
53.80 |
55.00 |
53.80 |
55.00 |
22.08 |
22.9 |
22.08 |
22.92 |
78 |
84 |
97 |
- |
84 |
97 |
| M39 |
58.80 |
60.00 |
58.80 |
60.00 |
24.58 |
25.4 |
24.58 |
25.42 |
84 |
90 |
103 |
- |
90 |
103 |
| M42 |
63.10 |
65.00 |
63.10 |
65.00 |
25.58 |
26.4 |
25.58 |
26.42 |
90 |
96 |
109 |
- |
96 |
109 |
| M45 |
68.10 |
70.00 |
68.10 |
70.00 |
27.58 |
28.4 |
27.58 |
28.42 |
96 |
102 |
115 |
- |
102 |
115 |
| M48 |
73.10 |
75.00 |
73.10 |
75.00 |
29.58 |
30.4 |
29.58 |
30.42 |
102 |
108 |
121 |
- |
108 |
121 |
| M52 |
78.10 |
80.00 |
78.10 |
80.00 |
32.5 |
33.5 |
32.5 |
33.5 |
- |
116 |
129 |
- |
116 |
129 |
| M56 |
82.80 |
85.00 |
82.80 |
85.00 |
34.5 |
35.5 |
34.5 |
35.5 |
- |
124 |
137 |
- |
- |
137 |
| M60 |
87.80 |
90.00 |
87.80 |
90.00 |
37.5 |
38.5 |
37.5 |
38.5 |
- |
132 |
145 |
- |
- |
145 |
| M64 |
92.80 |
95.00 |
92.80 |
95.00 |
39.5 |
40.5 |
39.5 |
40.5 |
- |
140 |
153 |
- |
- |
153 |
| M72 |
102.80 |
105.00 |
-- |
-- |
44.5 |
45.5 |
-- |
-- |
- |
156 |
169 |
- |
- |
- |