Triple Square screws

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Part of the series on
Screw drive types
	Slotted
	Phillips ("Crosshead")
	Pozidriv (SupaDriv)
	Torx
	Hex (Allen)
	Robertson
	Tri-Wing
	Torq-Set
	Spanner Head
	Triple Square (XZN)
Others:
polydrive, spline drive, double hex
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Triple square screws are found on German vehicles such as BMW, Mercedes, and Volkswagen. In Germany they are called XZN socket screws. These screws are used in high torque applications such as cylinder head bolts and drive train components.

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. They are NOT double hexes, and an Allen key will not fit them properly.