ARP uses premium grade materials that are far superior to '' aircraft '' quality. Each fastener is precisely heat treated and then is centerless ground to make it as close to perfectly concentric as possible.

Head Studs Key Features:

Premium grade 8740 alloy.

Heat treated to 200,000 psi

Come with parallel ground washers

Rolled threads after heat-treat process

Main Studs Key Features:

Premium grade 8740 chrome moly steel

200,000 psi tensile strength

J-form rolled threads

Come with parallel washers and nuts

Rod Bolts Key Features:

Premium grade 8740 chrome moly steel

Far superior to OEM Fasteners

Hi-Performance series are rated at 200,000 psi

Pro series are rated at 220,000 psi