Alternative Categorizations
There are various other ways to categorize screw drives. One way is by shape of the fastener screw drive:
- External
- Hex
- Line (ALH)
- Square
- Socket heads
- Bristol
- Clutch
- Double hex
- Hex socket
- Hexalobular socket
- Line (ALR)
- Polydrive
- Robertson
- Spline
- TP3
- Triple square
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