Types of Screw Drives
| Screw drive types | |
|---|---|
|
|
Slot (flat) |
|
|
Phillips PH |
|
|
Pozidriv (SupaDriv) PZ |
|
|
Square |
|
|
Robertson (square) |
|
|
Hex |
|
|
Hex socket (Allen) |
|
|
Security hex socket (pin-in-hex-socket) |
|
|
Torx T & TX |
|
|
Security Torx TR |
|
|
Tri-Wing |
|
|
Torq-set |
|
|
Spanner head (Snake-eye) |
|
|
Triple square XZN |
|
|
Polydrive |
|
|
One-way |
|
|
Spline drive |
|
|
Double hex |
|
|
Bristol |
|
|
Pentalobular |
Modern screws employ a wide variety of drive designs, each requiring a different kind of tool to drive in or extract them. The most common screw drives are the slotted and Phillips in the US; hex, Robertson, and Torx are also common in some applications, and Pozidriv has almost completely replaced Phillips in Europe. Some types of drive are intended for automatic assembly in mass-production of such items as automobiles. More exotic screw drive types may be used in situations where tampering is undesirable, such as in electronic appliances that should not be serviced by the home repair person.
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