ARP Hex Bolt Kits

3/8˝-16 SAE Bolt Kit for Automotive, Marine, and Trailer Applications

Part #: 654-2250

Overview

The ARP Hex Bolt Kits are premium-grade fasteners designed to meet the demanding needs of automotive enthusiasts, marine professionals, and trailer builders. Crafted from high-quality chromoly steel, these bolts provide exceptional strength and durability, ensuring reliable performance in a variety of applications. Whether you're assembling engine components, securing trailer parts, or performing custom modifications, these bolts offer a robust solution that supports safety and longevity.

Designed for those who require high tensile strength and precision fitment, ARP's hex bolt kits are ideal for both professional mechanics and serious DIYers. The heat-treated chromoly construction ensures the fasteners can withstand high stress and harsh environments, making them suitable for use in performance engines, off-road vehicles, and marine settings. With their black oxide finish, these bolts also offer corrosion resistance, helping maintain their integrity over time.

Key Features

ARP Hex Bolt Kits incorporate several advanced features that set them apart from standard hardware. The fasteners are made from 8740 chromoly steel, a material known for its excellent strength-to-weight ratio and toughness. The heat treatment process enhances their tensile strength, rated at 180,000 psi, providing a significant safety margin over typical Grade 8 hardware. This ensures your assemblies remain secure under high loads and vibrations.

• Premium Material: 8740 chromoly steel for superior strength and durability.
• Heat-Treated: Precision heat treatment for consistent high tensile strength.
• Corrosion Resistance: Black oxide finish helps resist rust and corrosion in demanding environments.
• Design: Flanged hex head for easy installation and removal with standard tools.
• Size & Thread: 3/8 inch diameter with 16 threads per inch, suitable for a wide range of applications.
• Underhead Length: 2.250 inches, providing ample grip length for secure fastening.
• Versatility: Suitable for automotive, marine, trailer, and industrial uses where high strength fasteners are required.
• Safety Margin: Rated at 180,000 psi tensile strength, offering extra margin of safety over conventional hardware.

Construction & Design

These ARP hex bolts are engineered with precision and attention to detail. The one-piece, heat-treated chromoly steel construction ensures uniform strength and reliability. The flanged hex head design allows for a secure grip with standard wrenches or sockets, facilitating straightforward installation and removal. The black oxide finish not only enhances corrosion resistance but also provides a sleek, professional appearance suitable for visible engine bays and custom builds.

The fasteners are manufactured with tight tolerances to ensure proper fitment and consistent performance. Their robust design makes them suitable for high-stress environments, including engine assembly, suspension components, and structural attachments. The 2.250-inch underhead length offers sufficient thread engagement, promoting secure fastening without risking over-tightening or damage.

Performance & Reliability

While these bolts are not designed to increase horsepower directly, their high tensile strength and reliable construction support the integrity of your vehicle's critical components. Using ARP fasteners can help prevent failures caused by under-strength hardware, especially in high-performance or off-road applications. Their corrosion-resistant finish ensures long-term durability, even in marine or humid environments, maintaining safety and performance over time.

Installation & Fitment

Installing the ARP Hex Bolt Kits is straightforward, thanks to their standard hex head design compatible with common tools. These bolts are intended as direct replacements for OEM or aftermarket fasteners of similar size and thread pitch. No special modifications, cutting, or drilling are required for proper installation. For optimal safety and performance, torque specifications should be followed according to your vehicle or application’s requirements.

• Easy bolt-on installation with standard tools
• No cutting, drilling, or special modifications needed
• Suitable for use in high-stress automotive and marine applications

What's Included

• Complete set of ARP Hex Bolts, 3/8˝-16 x 2.250 inches
• High-quality fasteners manufactured from heat-treated chromoly steel
• Black oxide finish for corrosion resistance

Ideal For

• Automotive enthusiasts performing engine builds or modifications
• Marine applications requiring high-strength fasteners
• Trailer assembly and repair where durability is critical
• Off-road vehicles subjected to harsh conditions
• Professional mechanics and DIYers seeking reliable hardware