Proform Wedge-Locking Exhaust Collector Bolts - Engine Builder Magazine

Proform Wedge-Locking Exhaust Collector Bolts

One less thing to come loose is enough of a reason to check out these simple locking bolts. Each Proform Grade 8 Collector Bolt and Nut combo includes two pairs of special locking washers.

One less thing to come loose is enough of a reason to check out these simple locking bolts. Each Proform Grade 8 Collector Bolt and Nut combo includes two pairs of special locking washers.

When the combo is torqued to 28+ ft.-lbs., the washers’ super-hardened external teeth bite into and grip the bottom of the bolt head and the top surface of the flange. After being self-locked in this manner, any bolt-loosening rotation is blocked by a wedge-locking action created by the washers interfacing, matching cams.

Vibration that might ordinarily loosen the bolt actually increases the wedge-locking tension, securing the bolt even more. Because this simple wedge-locking method uses tension instead of friction, contact with oil actually facilitates the wedge effect. Proform Collector Bolts can be untightened with a normal wrench, lubricated, and reused.

  • Resists vibrating loose
  • Super-hard cam-locking washers
  • No little clips or retainers to handle
  • Oil actually improves performance
  • Economical and reusable

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