ARP 2-Bolt Main Stud Kit for 1991–2000 BMW 325i/525i/M3/Z3 – M50/M52/S50US/S52US Engines

Description

Designed for BMW’s robust M50-based 24-valve inline-6 engines, the ARP 2-Bolt Main Stud Kit offers bulletproof bottom-end reinforcement. It eliminates main cap walk and fretting while preserving block threads under high load conditions, ideal for high-performance street builds and full-race applications alike.

Made from premium 8740 chrome moly steel, each stud is heat-treated to 190,000 psi and rolled with J-form threads after treatment—ensuring unmatched fatigue strength. Complete with hardened washers and aerospace-grade nuts, this kit replaces factory hardware with racing-grade reliability.

Features:

• Heat-treated to 190,000 psi tensile strength
• Rolled threads offer 1000% better fatigue strength
• Prevents main cap walk and block thread damage
• Fits BMW M50, M52, S50US, and S52US engines
• Replaces BMW OEM part numbers for easy install
• Cold-forged for superior molecular integrity
• Includes aerospace-grade nuts and washers
• Ideal for high-horsepower or track builds

Specifications:

• Main Bolt Style: 2-bolt
• Fastener Style: Stud
• Fastener Nut Style: Standard hex
• Works with Windage Tray: No
• Fastener Tensile Strength (psi): 190,000 psi
• Nuts Included: Yes
• Washers Included: Yes
• Quantity: Sold as a kit

Included:

• (1) Head Stud Kit

Fitment:

• 1991-1995 E34 525i (24v, M50 and M50TU)
• 1992-1995 E36 325i, 325is (M50 non-VAN0S & M50TU VAN0S)
• 1996-1998 E36 328i, 328is (M52)
• 1994-1995 E36 M3 3.0 liter (US spec)
• 1996-1999 E36 M3 3.2 liter (US spec)
• 1997-1998 E39 528i (single VAN0S)
• 1997-1998 Z3 2.8 liter
• 1998-2000 MZ3 M Roadster / M Coupe

Note:

• Lifetime Warranty 

Explore more from our collection.