ARP Main Bolt Kits

Multiple BMW Fitments (201–5201)

Part #: 201-5201

Overview

The ARP Main Bolt Kit for BMW models is designed to provide high-strength, reliable fasteners for critical engine components. Crafted with precision and durability in mind, this kit ensures your engine maintains optimal integrity under demanding conditions. Whether you're building a performance engine, restoring a stock setup, or enhancing your vehicle's reliability, this bolt kit offers the quality and consistency you need.

Ideal for automotive enthusiasts, professional rebuilders, and racers, the ARP Main Bolt Kit helps support increased horsepower and torque by maintaining proper engine alignment and reducing the risk of fastener failure. Its robust construction ensures your engine remains secure during spirited driving, track days, or daily use.

Key Features

The ARP Main Bolt Kit is engineered with advanced materials and manufacturing processes to deliver superior strength and longevity. Key features include:

• Manufactured from high-grade ARP2000® alloy steel, known for its exceptional tensile strength and fatigue resistance.
• Precision-machined threads and bolt bodies for perfect fitment and consistent clamping force.
• Heat-treated to optimize strength and durability, ensuring reliable performance over many miles and racing sessions.
• Designed to meet or exceed OEM specifications, providing a direct replacement that maintains engine integrity.
• Corrosion-resistant finish to withstand harsh engine bay conditions and prolong service life.
• Available for multiple BMW engine applications, ensuring a tailored fit for your specific model and year.

Construction & Design

The ARP Main Bolt Kit features meticulously engineered components made from ARP2000® alloy steel, a material renowned for its high tensile strength and fatigue endurance. Each bolt is CNC-machined to exact specifications, ensuring a precise fit and optimal clamping force. The heat treatment process enhances the material's mechanical properties, providing a reliable solution for high-performance and stock engines alike.

The design incorporates a corrosion-resistant finish, protecting against rust and corrosion in the engine bay. The kit includes all necessary bolts and fasteners to replace the factory hardware, simplifying installation and ensuring a secure, long-lasting connection.

Performance & Reliability

Using the ARP Main Bolt Kit helps improve engine reliability by maintaining proper component alignment and reducing the risk of fastener failure during high-stress conditions. While it is not a performance upgrade per se, the high-quality construction ensures your engine remains secure under increased power levels and spirited driving. This kit is an excellent choice for those seeking peace of mind and durability in their engine assembly or rebuild.

Installation & Fitment

The ARP Main Bolt Kit is designed as a direct bolt-on replacement for specified BMW engines. Installation is straightforward for experienced mechanics or enthusiasts familiar with engine assembly. No special tools or modifications are typically required, and the kit includes all necessary fasteners for a complete upgrade. As always, proper torque specifications and tightening sequences should be followed to ensure optimal clamping force and engine integrity.

It is recommended to consult your vehicle's service manual or a professional mechanic to verify compatibility with your specific BMW model and engine configuration.

What's Included

• Complete set of main bolts and fasteners tailored for BMW engines listed in the fitment guide
• High-strength ARP2000® alloy steel construction
• Detailed installation instructions (if provided by ARP)

Ideal For

• Engine rebuilds and restorations
• High-performance street and track applications
• Enthusiasts seeking durable, reliable fasteners for BMW engines
• Professional mechanics and rebuilders

Emissions Note

This product is designed for use in vehicles that comply with local emissions regulations. Please verify compatibility with your vehicle's emissions standards before installation. ARP hardware is intended for off-road, racing, or recreational use where local laws permit.