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ASME/ANSI B18.13.1M-4-1998
Type AB metric cross recessed pan head tapping screws and external tooth lock washers assemblies-Table 4
Nom
P
dk max
dk min
k max
k min
M
No.
t
d max
d min
d1 max
d1 min
dc max
dc min
h max
h 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
5.85
5.45
0.45
0.3
ST3.5
1.3
7
6.6
2.6
2.3
3.9
2
2.14
3.53
3.35
2.64
2.51
7.35
6.85
0.55
0.4
ST4.2
1.4
8
7.6
3.1
2.8
4.36
2
2.54
4.22
4.04
3.1
2.95
8.25
7.75
0.6
0.45
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
9.7
9.2
0.6
0.45
ST5.5
1.8
11
10.5
4
3.7
6.3
3
3.34
5.46
5.28
4.17
3.99
10.5
10
0.65
0.5
ST6.3
1.8
12
11.5
4.6
4.3
6.8
3
3.84
6.25
6.03
4.88
4.7
12.1
11.6
0.75
0.6
ST8
2.1
16
15.5
6
5.6
8.82
4
4.96
8
7.78
6.2
5.99
16
15.25
0.85
0.7
ST9.5
2.1
20
19.4
7.5
7.1
10.04
4
6.16
9.65
9.43
7.85
7.59
19.3
18.55
1
0.8
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