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JIS B1124-1-2021
Hexagon head self-drilling and tapping screws with collar-Table 1
Nom
P
a max
dc max
dc min
h min
s max
s min
e min
k max
k min
r max
Drilling plate thickness min
Drilling plate thickness max
z min
ST2.9
1.1
1.1
6.3
5.8
0.4
4
3.82
4.28
2.8
2.5
0.4
0.7
1.9
6.25
ST3.5
1.3
1.3
8.3
7.6
0.6
5.5
5.32
5.96
3.4
3
0.5
0.7
2.25
6.65
ST4.2
1.4
1.4
8.8
8.1
0.8
7
6.78
7.59
4.1
3.6
0.6
1.75
3
8.7
ST4.8
1.6
1.6
10.5
9.8
0.9
8
7.78
8.71
4.3
3.8
0.7
1.75
4.4
9.3
ST5.5
1.8
1.8
11
10
1
8
7.78
8.71
5.4
4.8
0.8
1.75
5.25
11
ST6.3
1.8
1.8
13.5
12.2
1
10
9.78
10.95
5.9
5.3
0.9
2
6
12
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