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GB/T 847-1985
Cross recessed raised countersunk head tapping screws-type F -type Z
Nom
P
a max
dk max
dk min
f
k max
No.
M
t min
t max
ST2.2
0.8
0.8
3.8
3.5
0.5
1.1
0
2.2
1.15
1.4
ST2.9
1.1
1.1
5.5
5.2
0.7
1.7
1
3.3
1.8
2.1
ST3.5
1.3
1.3
7.3
6.9
0.8
2.35
2
4.8
2.25
2.7
ST4.2
1.4
1.4
8.4
8
1
2.6
2
5.2
2.65
3.1
ST4.8
1.6
1.6
9.3
8.9
1.2
2.8
2
5.6
2.9
3.35
ST5.5
1.8
1.8
10.3
9.9
1.3
3
3
6.6
2.95
3.4
ST6.3
1.8
1.8
11.3
10.9
1.4
3.15
3
7.2
3.4
3.85
ST8
2.1
2.1
15.8
15.4
2
4.65
4
9.5
4.75
5.2
ST9.5
2.1
2.1
18.3
17.8
2.3
5.25
4
10.4
5.6
6.05
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