Small Hex Head, 5/8" Spanner Size
Torque Setting : 60 ft. Lbs (81Nm)
Thread size : 7/16-20"
Under Head Length : 2.250" (57mm)
Washer Size : .310" (7.8mm) Thick x 1.750" (44mm)
Diameter Spanner Size : 5/8"
 
The Aeroflow harmonic balancer bolt is designed to suit Small Block Chevy engines. Made from a Grade 8 steel they are heat-treated for superior strength. They feature a high hex head to prevent socket slippage while rotating the engine during assembly or routine service inspections. An extra thick, parallel ground washer is provided to allow for a more accurate, uniform torque. With a durable zinc dichromate, gold tone finish, complete with split lock washer to prevent loosening caused by vibration