ARP Hex Bolt Kits

2010–2025 Universal Fit for Cars, Boats, and Trailers

Part #: 661-1001

Overview

The ARP Hex Bolt Kits are premium-quality fasteners designed to provide reliable, high-strength fastening solutions for a wide range of automotive, marine, and trailer applications. Crafted from top-grade materials and heat-treated for maximum durability, these bolts are ideal for enthusiasts and professionals seeking to ensure safety and performance in their projects. Whether you're assembling engine components, securing trailer parts, or performing custom modifications, these ARP bolts deliver peace of mind with their superior tensile strength and corrosion resistance.

Designed for those who demand the best in quality and reliability, the ARP Hex Bolt Kits help support the integrity of your build while offering ease of installation. Their robust construction and precise threading make them suitable for various applications, ensuring a secure fit every time. If you're looking to upgrade your hardware with dependable, high-performance fasteners, these ARP bolts are an excellent choice.

Key Features

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

• Manufactured from 8740 chromoly steel, these bolts offer exceptional strength and toughness, making them suitable for demanding automotive and industrial applications.
• Heat-treated to a tensile strength of 180,000 psi, providing a substantial safety margin over typical Grade 8 hardware, ensuring durability under high-stress conditions.
• Black oxide finish enhances corrosion resistance and provides a sleek, professional appearance suitable for visible engine bay components or marine environments.
• Flanged hex head design allows for easy installation and removal with standard tools, while distributing load evenly for secure fastening.
• Nominal thread size of M8 x 1.25 ensures compatibility with a wide range of components and assemblies.
• Underhead length of 20mm offers versatility for various mounting depths and applications.
• Precision threading and manufacturing tolerances ensure smooth installation and consistent performance across multiple uses.
• Versatile use for automotive, boat, and trailer applications, making these bolts a reliable choice for multiple projects.
• Designed to meet or exceed industry standards for fastener quality and safety, providing confidence in critical applications.

Construction & Design

The ARP Hex Bolt Kits are constructed from high-grade 8740 chromoly steel, a material renowned for its strength and toughness. The bolts undergo a rigorous heat-treatment process that enhances their tensile strength to 180,000 psi, ensuring they can withstand high loads and stresses without failure. The black oxide finish not only provides a corrosion-resistant barrier but also reduces glare and enhances the bolt's appearance.

The flanged hex head design facilitates easy installation and removal using standard wrenches or sockets, while the precise threading ensures a secure fit. The underhead length of 20mm makes these bolts suitable for a variety of mounting depths, offering flexibility for different applications. Their robust construction and meticulous manufacturing process guarantee long-lasting performance, even in harsh environments such as marine or off-road conditions.

Performance & Reliability

These ARP fasteners are engineered to deliver consistent, high-performance results in demanding scenarios. Their superior tensile strength provides a significant safety margin over conventional hardware, making them suitable for critical applications where failure is not an option. The corrosion-resistant black oxide finish ensures longevity and maintains appearance over time, even when exposed to moisture or saltwater.

Installation & Fitment

The ARP Hex Bolt Kits are designed for straightforward, bolt-on installation. Their standard M8 x 1.25 thread size and flanged hex head allow for quick and secure fastening using common hand tools. No special modifications or tuning are required, making them suitable for both professional mechanics and DIY enthusiasts. Always ensure proper torque specifications are followed to achieve optimal clamping force and safety.

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

What's Included

• Complete set of ARP Hex Bolts with black oxide finish
• Hardware designed for versatile use across multiple applications
• Detailed installation instructions (if applicable)

Ideal For

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

Emissions Note

This product is designed for general use and does not impact vehicle emissions. It is intended for off-road, racing, or industrial applications where legal compliance is not mandated. Always verify local regulations before installation in street-driven vehicles.