UNI 6956 Countersunk (Flat) Head Tapping Screws with Cross Recess, Form C
Dimensions UNI 6956 Countersunk (Flat) Head Tapping Screws with Cross Recess, Form C
| Thread size |
p |
a |
dk |
f |
k |
r |
rf |
cross recess |
Type H |
Type Z |
Y max |
| m |
Penetration depth |
m |
Penetration depth |
| max |
nominal=max |
min |
approx |
approx |
max |
approx |
No. |
approx |
min |
max |
approx |
min |
max |
Type C |
Type F |
| ST 2.2 |
0.8 |
0.8 |
4.3 |
4 |
0.7 |
1.3 |
0.8 |
3.8 |
1 |
2.8 |
1.17 |
1.57 |
2.4 |
1.1 |
1.35 |
2 |
1.6 |
| ST 2.9 |
1.1 |
1.1 |
5.5 |
5.2 |
0.9 |
1.7 |
1.1 |
4.6 |
1 |
3.4 |
1.81 |
2.21 |
3.1 |
1.83 |
2.08 |
2.6 |
2.1 |
| ST 3.5 |
1.3 |
1.3 |
6.8 |
6.44 |
1.2 |
2.1 |
1.4 |
5.4 |
2 |
4.6 |
1.89 |
2.39 |
4.3 |
1.88 |
2.34 |
3.2 |
2.5 |
| ST 3.9 |
1.3 |
1.3 |
7.5 |
7.14 |
1.3 |
2.3 |
1.5 |
6 |
2 |
4.7 |
2.04 |
2.54 |
4.4 |
2 |
2.46 |
3.5 |
2.7 |
| ST 4.2 |
1.4 |
1.4 |
8.1 |
7.74 |
1.4 |
2.5 |
1.6 |
6.6 |
2 |
4.9 |
2.24 |
2.74 |
4.6 |
2.26 |
2.72 |
3.7 |
2.8 |
| ST 4.8 |
1.6 |
1.6 |
9.5 |
9.14 |
1.5 |
3 |
1.9 |
8.2 |
2 |
5.4 |
2.7 |
3.2 |
5.1 |
2.69 |
3.15 |
4.3 |
3.2 |
| ST 5.5 |
1.8 |
1.8 |
10.8 |
10.37 |
1.7 |
3.4 |
2.1 |
9.4 |
3 |
7 |
3.02 |
3.53 |
6.6 |
2.92 |
3.38 |
5 |
3.6 |
| ST 6.3 |
1.8 |
1.8 |
12.4 |
11.97 |
2 |
3.8 |
2.4 |
11.1 |
3 |
7.4 |
3.46 |
3.96 |
7.1 |
3.4 |
3.86 |
6 |
3.6 |