Proform 66751 Exhaust Header Bolt, Steel - Black

Each PROFORM Grade 8 Header Bolt is permanently assembled with a pair of special washers. When the bolt is torqued to 28+ Feet Pounds, 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.

• Permanently Assembled With A Pair Of Special Washers
• Simple Wedge Locking. Can Be Untightened With A Normal Wrench, Lubricated, And Reused
• No Little Clips Or Retainers To Handle
• Oil Actually Improves Performance
• Bolt Type - Universal
• Head Type - Hex Head
• Length - 3/4 in.
• Thread Size - 3/8 in.-20
• Washer Type - Wedge Locking
• Finish - Black Oxide
• Color - Black
• Material - Steel