Proform 12 pcs. 3/8 x 3/4 in. hex head wedge-locking header bolts 66751 - Read Reviews on Proform #66751

Proform Exhaust Header Bolt - Performance

Part Number: 66751
Features & Benefits

Each PROFORM Grade 8 Header Bolt is permanently assembled with a pair of special washers. 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. Its 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.

  • Each PROFORM Grade 8 Header Bolt is permanently assembled with a pair of special washers.
  • 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.
  • Its 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.
Product Details
Part Number: 66751
Weight: 0.65lbs
Bolt Grade: Grade 8
Hardware Material: steel
Item Grade: High Performance
Package Contents: header bolts
Package Quantity: 12
Shipping Information: Overnight and Two Day shipping are not available for PO Box, APO/FPO/DPO or US Territory addresses.

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