ARP Main Stud Kits

Universal Fitment

Part #: 201-5402

Overview

The ARP Main Stud Kit is a high-strength fastening solution designed for engine builders seeking enhanced reliability and durability. Crafted from premium 8740 chromoly steel and heat-treated to achieve a tensile strength of 190,000 psi, these studs provide a robust alternative to traditional main cap bolts. Ideal for performance enthusiasts and professional rebuilds, this kit helps prevent main cap walk and fretting, ensuring consistent engine integrity under demanding conditions. Whether you're assembling a high-performance street engine or a race-ready powerplant, these studs support a secure, stable main bearing cap connection, contributing to long-term engine reliability and peace of mind.

Key Features

This kit features precision-engineered components designed for strength and durability:

• Made from heat-treated 8740 chromoly steel for maximum tensile strength
• Rolled J-form threads after heat treatment for superior thread strength
• Complete with hardened, parallel-ground washers for even load distribution
• High-quality nuts designed for secure, reliable fastening
• Engineered to eliminate main cap walk and thread fretting
• Suitable for a variety of BMW engine applications
• Designed for easy installation and long-lasting performance

Construction & Design

The studs are machined from high-grade chromoly steel, known for its exceptional strength-to-weight ratio and resistance to fatigue. The J-form threads are rolled after heat treatment, creating stronger, more durable threads that withstand the stresses of high-performance operation. Hardened washers are included to ensure even load distribution across the main caps, reducing the risk of warping or damage during assembly.

Installation & Fitment

Installation requires proper torque specifications and should be performed following engine assembly best practices. Fitment varies depending on specific BMW models; verify compatibility with your engine application using the part number 201-5402 and consult your engine builder or manufacturer guidelines for precise fitment details.

What’s Included

The kit includes all necessary studs, hardened washers, and nuts required for a complete installation, ensuring a secure and reliable main cap fastening solution for your engine rebuild or upgrade.