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ASME/ANSI B18.13.1M-2-2003
Type AB metric cross recessed pan head self tapping screw and spring lock washers assemblies-Table 2
Nom
P
dk max
dk min
k max
k min
M
No.
t
d max
d min
d1 max
d1 min
d2 max
d2 min
b min
h min
dc max
dc min
ST2.9
1
5.6
5.3
2.4
2.2
2.86
1
1.83
2.9
2.76
2.18
2.08
2.57
2.44
1.19
0.79
5.1
4.83
ST3.5
1.3
7
6.6
2.6
2.3
3.9
2
2.14
3.53
3.35
2.64
2.51
3.08
2.95
1.57
0.86
6.43
6.09
ST4.2
1.4
8
7.6
3.1
2.8
4.36
2
2.54
4.22
4.04
3.1
2.95
3.66
3.5
1.98
0.79
7.82
7.47
ST4.8
1.6
9.5
9.1
3.7
3.4
4.76
2
2.94
4.8
4.62
3.58
3.43
4.11
3.96
2.05
1.42
8.43
8.07
ST5.5
1.8
11
10.5
4
3.7
6.3
3
3.34
5.46
5.28
4.17
3.99
4.78
4.6
2.05
1.42
9.09
8.71
ST6.3
1.8
12
11.5
4.6
4.3
6.8
3
3.84
6.25
6.03
4.88
4.7
5.52
5.31
3.05
1.57
11.82
11.41
ST8
2.1
16
15.5
6
5.6
8.82
4
4.96
8
7.78
6.2
5.99
7.06
6.86
3.17
1.98
13.61
13.21
ST9.5
2.1
20
19.4
7.5
7.1
10.04
4
6.16
9.65
9.43
7.85
7.59
8.59
8.38
3.58
2.39
15.95
15.54
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