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Q 279-2012
Hexagon washer head tapping screws—Type F
Nom
P
a max
h min
dc max
dc min
s max
s min
e min
k max
k min
r min
ST2.9
1.1
1.1
0.4
6.3
5.8
4
3.82
4.28
2.8
2.5
0.1
ST3.5
1.3
1.3
0.6
8.3
7.6
5.5
5.32
5.96
3.4
3
0.1
ST4.2
1.4
1.4
0.8
8.8
8.1
7
6.78
7.59
4.1
3.6
0.2
ST4.8
1.6
1.6
0.9
10.5
9.8
8
7.78
8.71
4.3
3.8
0.2
ST5.5
1.8
1.8
1
11
10
8
7.78
8.71
5.4
4.8
0.2
ST6.3
1.8
1.8
1
13.5
12.2
10
9.78
10.95
5.9
5.3
0.3
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