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Q 221-1999
Type H cross recessed pan head tapping screw and large plain washer assemblies-type A-type C
Nom
P
dk max
dk min
k max
k min
No.
M
t min
t max
d1 max
d1 min
dc max
dc min
h min
h max
ST2.9
1.1
5.6
5.3
2.4
2.15
1
3
1.4
1.8
2.56
2.46
9
8.64
0.9
1.1
ST3.5
1.3
7
6.64
2.6
2.35
2
3.9
1.4
1.9
3.12
3
11
10.57
0.9
1.1
ST4.2
1.4
8
7.64
3.1
2.8
2
4.4
1.9
2.4
3.67
3.55
12
11.57
0.9
1.1
ST4.8
1.6
9.5
9.14
3.7
3.4
2
4.9
2.4
2.9
4.12
4
15
14.57
1.4
1.8
ST5.5
1.8
11
10.57
4
3.7
3
6.4
2.6
3.1
4.82
4.7
15
14.57
1.4
1.8
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