ARP Main Studs Kit for BMW E46 M3/S54

• Brand: ARP
• Part Number: ARP-201-5002
• Country of Manufacture: United States

The ARP main studs kit for the BMW E46 M3/S54 is engineered to eliminate main cap walk and fretting, while protecting the threads in your engine block. Each kit includes hardened parallel-ground washers and high-quality nuts. Select applications offer provisions for mounting windage trays, utilizing specially designed standoff studs with serrated lock nuts for secure positioning.

Manufactured from 8740 chrome moly steel, these studs are heat-treated in-house to achieve a tensile strength of 190,000 psi. Precision J-form threads are rolled after heat treatment, resulting in threads that are significantly stronger than standard fasteners.

ARP recommends main studs over bolts for several reasons: more accurate torque readings due to the elimination of stud “twist” during installation, reduced force on block threads for improved block longevity (especially important for aluminum blocks), easier engine assembly, and consistent main cap alignment.