Triple Square Bit Set

Retail Price: $14.15

Porsche uses 12 point, internal cap bolts in places where a small head and high tightening torque is needed (flywheel, pressure plate, door stays, axle shafts, etc). These fasteners can be frustrating to work with because special care and a special tool is needed.

These bits are made with hardened steel and great precision. Four bits are included in the set (6mm, 8mm,10mm, & 12mm) and each have a 13mm hex drive. These are imported but they are not the cheap ones sold at many autopart stores. We had an opportunity to use these on a recent 951 clutch job. The pressure plate bolts are a shallow head version of the M8 triple square bolt which means that many of these bolts end up getting drilled to get them out. But these bits worked great and all but one of the bolts came out clean.

Usage notes: the reason this type of fastener is used is due to its increased tool to fastener head surface. All of those small spline surfaces really add up and that means better coupling of torque to fastener. This surface area count falls off though if the bit is not held straight out from the fastener head. This is the first challenge with using triple square bits and should be considered when buying the bits. A long bit will provide a better chance of squarely engaging the fastener head.


ArnnWorx Triple Square Bits in use.
Fig.1 - ArnnWorx Triple Square Bits in use.


Add to Cart:

  • Model: TSBS
  • Shipping Weight: 1.1lbs
  • Manufactured by: Performance Tool

This product was added to our catalog on Monday 04 March, 2013.

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