ARP Hex Bolt Kits

Compatible with various applications, M8 x 1.25 Thread, 60mm Length

Part #: 661-1009

Overview

The ARP Hex Bolt Kits are designed to provide high-strength, reliable fastening solutions for a wide range of automotive, marine, and trailer applications. Crafted from premium-quality chromoly steel, these bolts are engineered to withstand demanding conditions while maintaining precise thread engagement and durability. Whether you're performing engine rebuilds, chassis modifications, or custom fabrication, these bolts offer the strength and reliability you need to ensure your project’s success.

Ideal for enthusiasts and professionals alike, the ARP Hex Bolt Kits deliver peace of mind with their superior tensile strength and heat-treated construction. Their black oxide finish not only enhances corrosion resistance but also provides a sleek, professional appearance. These bolts are perfect for applications requiring a secure, high-quality fastener that can handle high stress and vibration, making them suitable for both street and off-road use.

Key Features

ARP Hex Bolt Kits are built with precision and durability in mind, offering several key features that set them apart:

• Manufactured from 8740 chromoly steel, a material known for its exceptional strength and toughness, providing a tensile strength rating of 180,000 psi.
• Heat-treated to ensure consistent hardness and long-lasting performance under high-stress conditions.
• Black oxide finish enhances corrosion resistance and provides a professional, finished look suitable for visible engine components or chassis assemblies.
• Flanged hex head design allows for easy installation and removal with standard tools, reducing the risk of stripping or damage during tightening.
• Nominal thread size of M8 x 1.25 ensures compatibility with a wide range of components and fasteners in automotive and marine applications.
• Underhead length of 60mm provides ample thread engagement for secure fastening in various assembly configurations.
• Designed for versatility, these bolts are suitable for use in engine components, suspension parts, brackets, and other critical areas requiring high-strength fasteners.
• Manufactured and tested to meet or exceed industry standards, ensuring safety and reliability in demanding environments.
• Compatible with both professional workshops and DIY enthusiasts seeking premium hardware for their projects.

Construction & Design

The ARP Hex Bolt Kits feature a robust construction utilizing 8740 chromoly steel, a material renowned for its high tensile strength and toughness. The bolts are meticulously heat-treated to optimize hardness and durability, ensuring they can withstand the rigors of high-performance applications. The black oxide finish not only provides corrosion resistance but also reduces glare and enhances the aesthetic appeal of the fasteners.

The flanged hex head design facilitates easy installation and removal with standard wrenches or sockets, while the 60mm underhead length offers versatile engagement options. The precision-machined threads ensure a smooth, accurate fit, minimizing the risk of stripping or cross-threading. These design features collectively contribute to a fastener that is both reliable and easy to work with, even in tight or hard-to-reach spaces.

Performance & Reliability

Built to handle high-stress environments, the ARP Hex Bolt Kits provide a substantial safety margin with their 180,000 psi tensile strength rating. They are ideal for critical applications where failure is not an option, such as engine assembly, suspension mounting, or structural components. The heat treatment process ensures consistent performance over time, resisting fatigue and maintaining clamping force under vibration and thermal cycling.

Installation & Fitment

These bolts are designed for straightforward, bolt-on installation. They utilize standard M8 x 1.25 threads and a flanged hex head, compatible with common tools. No special modifications or additional hardware are required for most applications. The precise dimensions and high-quality manufacturing ensure a secure fit and reliable performance in a variety of automotive, marine, and trailer assemblies. Always verify thread compatibility and application requirements before installation.

• Easy to install with standard tools
• No cutting, drilling, or special tuning required
• Suitable for high-stress, high-vibration environments

What's Included

• Complete set of ARP Hex Bolts with black oxide finish
• All necessary hardware for installation
• Instruction sheet for proper torque specifications and installation tips

Ideal For

• Engine rebuilds and performance upgrades
• Chassis and suspension modifications
• Marine and trailer assembly requiring high-strength fasteners
• Custom fabrication projects demanding reliable hardware