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.

Features:
Grade 8 Steel
  • Hex Head Type
  • 1-inch Length
  • Fits Select 12 Bolt 3/8" Diameter Applications
  • PROFORM Parts Brand Product
  • Sold as Set of 12
  • More From This Category

    TURBOSMART IWG75 Universal Wastegate Actuator, 1/4″ UNF x 150mm, 14PSI, Each

    TURBOSMART IWG75 Universal Wastegate Actuator, 1/4″ UNF x 150mm, 14PSI, Each

    $202.86

    Whiteline Mount Bushing, Front, 20mm, Mount, Ford Maverick, For Nissan Patrol, Kit

    Whiteline Mount Bushing, Front, 20mm, Mount, Ford Maverick, For Nissan Patrol, Kit

    $19.10

    Sonnax Zip Kit®, Toyota U140E/F, U240E, U241E, Each

    Sonnax Zip Kit®, Toyota U140E/F, U240E, U241E, Each

    $369.64

    Dakota Digital Sending Unit, BIM MODULE

    Dakota Digital Sending Unit, BIM MODULE

    $563.81

    DBA Rear Street Series T2 Brake Rotor, 320mm, For BMW E46 330D/330i/325i 00-05, Kit

    DBA Rear Street Series T2 Brake Rotor, 320mm, For BMW E46 330D/330i/325i 00-05, Kit

    $209.30