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GB/T 9074.22-1988
Hexagon head tapping screw and plain washer assemblies-type C
Nom
P
s max
s min
e min
k max
k min
d1 max
d1 min
dc max
dc min
h min
h max
ST2.9
1.1
5
4.82
5.4
2.3
2
2.56
2.46
6
5.7
0.7
0.9
ST3.5
1.3
5.5
5.32
5.96
2.6
2.3
3.1
3
8
7.64
0.9
1.1
ST4.2
1.4
7
6.78
7.59
3
2.6
3.67
3.55
9
8.64
0.9
1.1
ST4.8
1.6
8
7.78
8.71
3.8
3.3
4.18
4.06
10
9.64
0.9
1.1
ST5.5
1.8
8
7.78
8.71
4.1
3.6
4.82
4.7
12
11.57
1.4
1.8
ST6.3
1.8
10
9.78
10.95
4.7
4.1
5.58
5.46
14
13.57
1.4
1.8
ST8
2.1
13
12.73
14.26
6
5.2
7.27
7.15
14
13.57
1.4
1.8
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