Machine screw: 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:
1. Flat countersunk.
2. Oval countersunk.
3. Pan.
4. Hex.
5. Hex washer.
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