ARP Hex Bolt Kits

5/16˝-18 SAE Bolt Kit for Automotive, Marine, and Trailer Applications

Part #: 651-0750

Overview

The ARP Hex Bolt Kits are high-quality fasteners designed to provide superior strength and durability for a wide range of automotive, marine, and trailer applications. Crafted from premium chromoly steel and heat-treated for optimal performance, these bolts are engineered to meet the demands of enthusiasts and professionals alike. Whether you're assembling engine components, securing trailer parts, or performing custom modifications, ARP's bolt kits offer a reliable solution that ensures safety and longevity.

Ideal for those seeking to upgrade from standard hardware, these bolts deliver enhanced tensile strength and resistance to stress and fatigue. Their black oxide finish not only provides corrosion resistance but also gives a sleek, professional appearance. With ARP's reputation for precision manufacturing and quality control, you can trust these fasteners to perform under demanding conditions, supporting your vehicle's performance and safety.

Key Features

ARP Hex Bolt Kits incorporate several advanced features that set them apart from conventional hardware:

• Premium Material: Made from 8740 chromoly steel, these bolts offer exceptional strength and toughness, making them suitable for high-stress applications.
• Heat Treatment: Carefully heat-treated to achieve a tensile strength of 180,000 psi, providing a significant safety margin over standard Grade 8 hardware.
• Corrosion Resistance: Finished with a black oxide coating that helps protect against rust and corrosion, extending the lifespan of the fasteners.
• Precision Manufacturing: Manufactured to strict tolerances to ensure proper fitment and reliable torque characteristics.
• Versatile Application: Suitable for automotive, boat, and trailer use, as well as custom projects requiring high-strength fasteners.
• Flanged Hex Head: Designed for easy installation and removal with a flanged hex head that provides a larger bearing surface.
• Nominal Size: 5/16 inch diameter with 18 threads per inch, compatible with a wide range of standard fittings and components.
• Underhead Length: 0.750 inches, ensuring proper engagement and secure fastening.

Construction & Design

The ARP Hex Bolt Kits are constructed from 8740 chromoly steel, a material renowned for its high strength-to-weight ratio and durability. The bolts undergo a proprietary heat treatment process that enhances their tensile strength to 180,000 psi, providing a robust solution for demanding applications. The black oxide finish not only improves corrosion resistance but also offers a sleek, professional appearance suitable for visible engine bays and custom builds.

The flanged hex head design allows for easy tightening and loosening with standard tools, while the precise threading ensures a secure fit. The underhead length of 0.750 inches provides ample thread engagement, reducing the risk of stripping or failure under load. These features combine to deliver a fastener that is both reliable and easy to install, making them an excellent choice for performance and safety.

Performance & Reliability

Designed for high-stress environments, these bolts support increased safety margins and help prevent fastener failure during intense driving or heavy-duty use. Their superior tensile strength ensures they can withstand significant loads, making them suitable for critical applications such as engine assembly, suspension components, and trailer hitch installations. The black oxide coating offers additional protection against the elements, ensuring long-term performance even in harsh conditions.

Installation & Fitment

The ARP Hex Bolt Kits are designed for straightforward, bolt-on installation. They utilize standard 5/16-18 threads and are compatible with most automotive and trailer components requiring this size. No special tools or modifications are necessary for installation, and the bolts can be torqued to manufacturer specifications or based on your specific application needs. Always follow proper torque procedures to ensure optimal performance and safety.

• Easy to install with standard tools
• No cutting, drilling, or special modifications required
• Suitable for a variety of automotive, marine, and trailer applications

What's Included

• Complete set of ARP 5/16˝-18 SAE hex bolts
• Hardware designed for durability and corrosion resistance

Ideal For

• Automotive enthusiasts performing engine or chassis assembly
• Marine applications requiring high-strength fasteners
• Trailer builders and repair professionals
• Custom fabrication projects demanding reliable hardware

Emissions Note

This product is designed for use in non-emissions-critical applications. Always verify compatibility with your local regulations and ensure proper installation for safety and compliance.