There are many important reasons to use ARP main bolt kits, including the elimination of main cap walk and fretting, as well as protecting the threads in your engine block. These studs are manufactured in our own factory using the best materials, processes, designs and engineering. Every ARP main bolt kit exceeds the most stringent aerospace specifications.
All kits come complete with hardened parallel-ground washers and aerospace quality bolts.
These studs are manufactured from 8740 chromemoly steel, heat-treated in-house to 190,000 psi tensile strength, and precision J-form threads rolled after heat-treat to create a fastener that has threads 1000% stronger than others.
Don't settle for anything less than the best. Insist on genuine ARP bolts, you'll find the name stamped right on the end!
ARP was the first company to design and engineer fasteners specifically for racing. We developed many patented process for manufacturing high strength fasteners from very strong materials. We have continued to improve our processes and quality control and we are now our manufacturing operations are ISO 9001 and AS9100 registered. There's not another company in the world that is as focused on building superior quality fasteners for all forms of racing and non-racing applications as ARP.