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Proform 66757

Wedge-Locking Collector Bolts

Proform 66757

778-66757 NEW

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Proform 66757 Wedge-Locking Collector Bolts $27.99
Wedge-Locking Collector Bolts
  • 3/8" Diameter, 1.25" Long
  • Black Oxide Finish
  • 6/Pkg.

  • Proform's Wedge-Locking grade 8 header bolts are designed to keep the bolts from backing out by using a pair of permanently attached special washers.

    So, How Do They Work? When the bolt 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 header. 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. It's an uphill climb: 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. When changing headers, PROFORM Header Bolts can be untightened with a normal wrench, lubricated, and reused. These high quality bolts are sold in complete sets (Enough bolts for both headers).

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