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ASME/ANSI B18.13.1M-2-1998
Type BT metric hex flange head self tapping cutting screw and spring lock washers assemblies-Table 2
Nom
P
s max
s min
e min
dc max
dc min
k max
d max
d min
d1 max
d1 min
d2 max
d2 min
d3 max
d3 min
b min
h min
dc1 max
dc1 min
ST2.9
1
4
3.84
4.27
6.4
5.9
3.2
2.9
2.76
2.18
2.08
2.01
1.88
2.57
2.44
1.19
0.79
5.1
4.83
ST3.5
1.3
5
4.82
5.36
7.5
6.9
3.8
3.53
3.35
2.64
2.51
2.41
2.26
3.08
2.95
1.57
0.86
6.43
6.09
ST4.2
1.4
5.5
5.32
5.92
8.5
7.8
4.3
4.22
4.04
3.1
2.95
2.84
2.69
3.66
3.5
1.98
0.79
7.82
7.47
ST4.8
1.6
7
6.78
7.55
10
9.3
5.2
4.8
4.62
3.58
3.43
3.3
3.12
4.11
3.96
2.05
1.42
8.43
8.08
ST5.5
1.8
7
6.78
7.55
11.2
10.3
6
5.46
5.28
4.17
3.99
3.86
3.68
4.78
4.6
2.05
1.42
9.09
8.71
ST6.3
1.8
8
7.78
8.66
12.8
1.8
6.7
6.25
6.03
4.88
4.7
4.55
4.34
5.52
5.31
3.05
1.57
11.82
11.41
ST8
2.1
10
9.78
10.89
16.8
15.5
8.6
8
7.78
6.2
5.99
5.84
5.64
7.06
6.86
3.17
1.98
13.61
13.21
ST9.5
2.1
13
12.72
14.16
21
19.3
10.7
9.65
9.43
7.85
7.59
7.44
7.24
8.59
8.38
3.58
2.38
15.95
15.54
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