| Part of the series on | |
|---|---|
| Screw drive types | |
|
|
Slotted (flat or straight) |
|
|
Phillips ("crosshead") PH |
|
|
Pozidriv (SupaDriv) PZ |
|
|
Square |
|
|
Robertson (square) |
|
|
Hex |
|
|
Hex socket (Allen) |
|
|
Torx T, TS, TX |
|
|
Tri-Wing |
|
|
Torq-set |
|
|
Spanner head (Snake-eye) |
|
|
Triple square XZN |
|
|
Polydrive |
|
|
One-way - Clutch |
|
|
Spline drive |
|
|
Double hex |
|
|
Bristol |
 |
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Triple square, also known as a XZN socket, is a type of screw drive. They are commonly found on German vehicles such as BMW, Mercedes, and Volkswagen[1]. These screws are used in high torque applications such as cylinder head bolts and drive train components. Triple square bolts are common to early Porsche and Volkswagen constant velocity joints.
Common sizes are 6, 8, 10, and 12 mm. Triple square drivers can be purchased at auto parts stores and through automotive tool distributors.
Increasingly, triple square screws are found on other European and Asian makes of cars.
Other names for triple square screws and drivers are "Double Hex", "Double Allen", and "Aircraft Screws". Despite this, "Double Hex" and "Double Allen" are misnomers. The recess in these bolts is actually (as the name suggests) made of three squares, not two hexagons. The corners are 90 degrees, not 120 degrees and therefore an Allen key will not fit them properly.
 6 mm and 8 mm triple square drivers. U.S. five cent coin shown for scale. |
 End view of 10 mm triple square screw. |
External links
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