Recommended for high HP and Toque applications, racing, drag, sled pulling, and other competition events. These specialty Main Studs will keep the main caps from walking at High Horse Power and High RPM's as well as protecting the threads in your engine block. Every ARP main stud kit exceeds the most stringent aerospace specifications. All kits come complete with hardened parallel-ground washers and aerospace quality nuts. Manufactured from 8740 chrome-moly steel, heat-treated in-house to 200,000 psi tensile strength, and precision J-form threads rolled after heat-treat to create a fastener that has threads 1000% stronger than others.