DIN7985, DIN84
The square drive is introduced as Type III in IFI 7th. Also, introduced are combined drive systems reflecting the expressed needs of users. IFI recommends that when selecting a head style for machine screws, the first design consideration be given to following five head styles:
-flat countersunk
-oval countersunk
-pan
-hex
-hex washer

MACHINE SCREWS
Thread cutting
screws.Types 1, 23 & F |
| UNC-Coarse |
UNF-Fine |
| SIZE-TP1 |
SIZE-TP1 |
1-64
2-56
3-48
4-40
5-40
6-32
8-32
0-24
10-24
12-24
1/4-20
5/16-18
3/8-16
7/16-14
1/2-14
9/16-12
5/8-11
3/4-10
7/8-9
1-8 |
0-80
1-72
2-64
3-56
4-48
5-44
6-40
8-36
10-32
12-28
1/4-28
5/16-24
3/8-24
7/16-20
1/2-20
9/16-18
5/8-18
3/4-16
7/8-14
1-14 |