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UNI 5931
Hexagon socket heads cap screws
Nom
P
dk max
dk min
da max
e min
k max
k min
r min
s max
s min
t min
M1.6
0.35
3
2.86
2
1.73
1.6
1.46
0.1
1.58
1.52
0.7
M2
0.4
3.8
3.62
2.6
1.73
2
1.86
0.1
1.58
1.52
1
M2.5
0.45
4.5
4.32
3.1
2.36
2.5
2.36
0.1
2.08
2.02
1.1
M3
0.5
5.5
5.32
3.6
2.87
3
2.86
0.1
2.58
2.52
1.3
M4
0.7
7
6.78
4.7
3.44
4
3.82
0.2
3.08
3.02
2
M5
0.8
8.5
8.28
5.7
4.58
5
4.82
0.2
4.095
4.02
2.5
M6
1
10
9.78
6.8
5.72
6
5.7
0.25
5.14
5.02
3
M8
1.25
13
12.73
9.2
6.86
8
7.64
0.4
6.14
6.02
4
M10
1.5
16
15.73
11.2
9.15
10
9.64
0.4
8.175
8.025
5
M12
1.75
18
17.73
13.7
11.43
12
11.57
0.6
10.175
10.025
6
M14
2
21
20.67
15.7
13.72
14
13.57
0.6
12.212
12.032
7
M16
2
24
23.67
17.7
16
16
15.57
0.6
14.212
14.032
8
M20
2.5
30
29.67
22.4
19.44
20
19.48
0.8
17.23
17.05
10
M24
3
36
35.61
26.4
21.73
24
23.48
0.8
19.275
19.065
12
M30
3.5
45
44.61
33.4
25.15
30
29.48
1
22.275
22.065
15.5
M36
4
54
53.54
39.4
30.85
36
35.38
1
27.275
27.065
19
M42
4.5
63
62.54
45.6
36.57
42
41.38
1.2
32.33
32.08
24
M48
5
72
71.54
52.6
41.13
48
47.38
1.6
36.33
36.08
28
M56
5.5
84
83.46
63
46.83
56
55.26
2
41.33
41.08
34
M64
6
96
95.46
71
52.53
64
63.26
2
46.33
46.08
38
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