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.
Attributes
Color Black Oxide
Country of Origin (Primary) TW
Emission Code Legal US
Harmonized Tariff Code (Schedule B) 7318159000
Hazardous Material Code N
Life Cycle Status Code 2
Life Cycle Status Description Available to Order
MSDS Required Flag N
NAFTA Preference Criterion Code B
Part Type Header Bolts

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Proform 66751 Wedge-Locking Header Bolts 3/4"L X 3/8", 12 Pieces

  • Brand: Proform
  • Product Number: 66751
  • $31.99