These ARP studs are rated at 220,000 psi tensile strength.
The studs are manufactured in ARP's Santa Paula, CA plant from proprietary ARP 2000 material, with threads rolled after heat-treat to provide optimum fatigue strength. They are centerless ground to assure perfect concentricity. The ends of the studs are broached to facilitate easy installation. Also included in each kit are heat-treated, chrome-moly steel 12-point nuts and parallel-ground washers. They are black oxide finished for extra durability.
All ARP2000 studs are centerless ground, heat treated prior to thread rolling and machining, nominally rated at 220,000psi tensile strength and are reusable as compared to the OEM Torque-To-Yield (TTY) head bolts. Optimum design, enhanced reliability and increased strength are the main attributes of ARP's Pro Series stud kits.