These Pro series studs from ARP are cold-forged to ensure molecular integrity. They are heat-treated prior to thread rolling and machining and are rated at a whopping 190,000 psi. The Pro series kits are also available with 12-point nuts, and all kits come complete with hardened parallel washers for an even load distribution and accurate torque readings.
ARP stands behind their products indefinitely with respect to materials and workmanship. Automotive Racing Products would like to deal with the customer directly when they have a problem. Automotive Racing Products is interested in customer satisfaction and will make exceptions on an individual and case-by-case basis.