ARP 209-5401 Main Cap Fasteners Main Stud Kit - 2-Bolt

The ARP 209-5401 Main Cap Fasteners are engineered to eliminate main cap walk and fretting while protecting engine block threads in high-performance applications. This 2-bolt main stud kit provides superior clamping force and reliability compared to factory hardware.

Key Features:

• Manufactured from premium 8740 chrome moly steel for exceptional strength
• Heat-treated in-house to 200,000 psi tensile strength
• Precision J-form threads rolled after heat-treat for 1000% stronger fatigue life
• Includes hardened parallel-ground washers and high-quality nuts
• Rolled threads provide superior durability compared to cut threads
• Complete kit ready for installation

ARP main studs are the preferred choice of professional engine builders for competition and high-performance street applications. The post-heat-treat thread rolling process creates a fastener with significantly longer service life than conventional main bolts, while the hardened washers ensure even load distribution across the main caps. These fasteners deliver the clamping force and consistency needed to keep main caps secure under extreme cylinder pressures and loads.