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Your cart is empty.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).
Kim Rosinski
Reviewed in the United States on November 24, 2024
Proform is a decent brand at a good price and got here pretty quick. Not overnight but quick
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