ARP Hex Bolt Kits

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

Part #: 661-1002

Overview

The ARP Hex Bolt Kits are high-quality fasteners designed to provide reliable and durable fastening solutions for a wide range of automotive, marine, and trailer applications. Crafted from premium materials and engineered for strength, these bolts are ideal for enthusiasts and professionals seeking to ensure the integrity of their assemblies. Whether you're upgrading your vehicle, securing components on a boat, or assembling a trailer, these bolts deliver exceptional performance and peace of mind.

Designed with versatility in mind, the ARP Hex Bolt Kits are perfect for those who demand premium hardware that can withstand demanding conditions. Their robust construction and heat-treated chromoly material make them suitable for both daily driving and high-stress environments, supporting your projects with a substantial safety margin and long-lasting reliability.

Key Features

ARP Hex Bolt Kits feature a range of technical attributes that set them apart from standard fasteners:

• Premium Material: Made from heat-treated 8740 chromoly steel, these bolts offer exceptional strength and durability, ensuring they can handle high-stress loads and harsh conditions.
• High Tensile Strength: Rated at 180,000 psi tensile strength, these fasteners provide a significant safety margin over typical Grade 8 hardware, making them suitable for critical applications.
• Corrosion Resistance: Finished with a black oxide coating, these bolts resist corrosion and rust, maintaining their integrity over time even in challenging environments.
• Precision Threading: The M8 x 1.25 metric thread size ensures compatibility with a wide range of components and assemblies, providing a secure fit and reliable fastening.
• Flanged Hex Head: The flanged hex head design allows for easy installation and removal using standard tools, while providing a larger bearing surface to distribute load evenly.
• Optimized Length: With an underhead length of 25mm, these bolts are suitable for various applications requiring a specific thread engagement and fastening depth.
• Versatile Use: Suitable for automotive engine components, marine hardware, trailer assemblies, and other projects requiring high-strength fasteners.
• Heat Treatment: The specially heat-treated chromoly fasteners ensure consistent mechanical properties and long-term performance.
• Quality Assurance: Manufactured to strict standards, ARP fasteners are trusted by professionals and enthusiasts worldwide for their reliability and precision.

Construction & Design

The ARP Hex Bolt Kits are constructed from 8740 chromoly steel, a material renowned for its exceptional strength-to-weight ratio and toughness. The bolts undergo a precise heat-treatment process to achieve a tensile strength of 180,000 psi, ensuring they can withstand high loads without deformation or failure. The black oxide finish not only enhances corrosion resistance but also provides a sleek, professional appearance.

The flanged hex head design facilitates easy installation with standard wrenches or sockets, while the flange helps distribute clamping force evenly across the mating surface. The 25mm underhead length is carefully engineered to provide optimal thread engagement, ensuring secure fastening in a variety of applications. These design features combine to produce a fastener that is both strong and reliable, capable of enduring the rigors of demanding environments.

Installation & Fitment

The ARP Hex Bolt Kits are designed for straightforward, bolt-on installation. Their standard M8 x 1.25 thread size makes them compatible with a wide range of components and assemblies. No special tools or modifications are required beyond standard hand tools. The bolts can be installed using a wrench or socket, and their precise dimensions ensure a proper fit every time. Their high-quality construction means you can trust these fasteners to perform reliably in both casual and high-performance applications.

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

What's Included

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

Ideal For

• Automotive enthusiasts upgrading engine components or assemblies
• Marine applications requiring corrosion-resistant fasteners
• Trailer builders and repair professionals
• Any project demanding high-strength, reliable fasteners