ARP Hex Bolt Kits

Applicable for various automotive, marine, and trailer applications

Part #: 661-1005

Overview

The ARP Hex Bolt Kits are premium-grade fasteners designed to provide reliable, high-strength fastening solutions for a wide range of automotive, marine, and trailer applications. Crafted from heat-treated 8740 chromoly steel, these bolts offer exceptional tensile strength and durability, making them ideal for enthusiasts and professionals seeking to ensure safety and performance in their projects. Whether you're assembling engine components, securing chassis parts, or performing custom modifications, these bolts deliver consistent quality and peace of mind.

Designed for those who demand the best, ARP's hex bolt kits are perfect for applications where strength, reliability, and corrosion resistance are critical. Their black oxide finish not only enhances corrosion resistance but also provides a sleek, professional appearance. These fasteners are engineered to withstand the rigors of high-stress environments, supporting your vehicle's performance and longevity.

Key Features

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

• Manufactured from heat-treated 8740 chromoly steel, providing a tensile strength rating of 180,000 psi for maximum safety margin.
• Black oxide finish offers excellent corrosion resistance and a professional aesthetic suitable for high-performance builds.
• Flanged hex head design ensures a secure grip and even load distribution during tightening, reducing the risk of bolt failure.
• Precisely machined threads with M8 x 1.25 thread size ensure compatibility with a wide range of components and applications.
• Underhead length of 40mm provides sufficient engagement depth for secure fastening in various assembly scenarios.
• Ideal for high-stress applications such as engine assembly, drivetrain components, and structural attachments.
• Manufactured by ARP, a trusted leader in high-performance fasteners with decades of experience in motorsports and automotive industries.
• Designed to meet or exceed OEM standards, ensuring compatibility and reliable performance.
• Suitable for use in cars, boats, trailers, and other machinery requiring durable, high-strength fasteners.

Construction & Design

The ARP Hex Bolt Kits are meticulously engineered using high-quality 8740 chromoly steel, which is known for its excellent strength-to-weight ratio and toughness. The bolts undergo a proprietary heat-treatment process that enhances their tensile strength, ensuring they can withstand extreme loads and vibrations. The black oxide coating not only provides corrosion resistance but also reduces galling during installation, facilitating easier assembly and disassembly.

The flanged hex head design allows for a secure grip with standard tools, while the precise threading ensures a snug fit that maintains clamping force over time. The 40mm underhead length offers versatility for various applications, providing ample thread engagement without risking over-tightening. These design features collectively contribute to the bolts' durability, reliability, and ease of use in demanding environments.

Performance & Reliability

While these bolts are not rated for specific horsepower or torque gains, their high tensile strength and superior construction make them an excellent choice for critical fastening points where safety and integrity are paramount. They help support the structural integrity of your vehicle or equipment, reducing the risk of fastener failure under high loads or thermal cycling. Their corrosion-resistant finish ensures long-lasting performance, even in harsh conditions.

Installation & Fitment

The ARP Hex Bolt Kits are designed for straightforward, bolt-on installation. They utilize standard M8 x 1.25 threads, making them compatible with a wide range of OEM and aftermarket components. No special tools or modifications are required for installation, and the bolts can be torqued to manufacturer specifications or your preferred settings for optimal clamping force. Always ensure proper tightening sequences and torque values to maximize safety and performance.

• Easy to install with common hand tools.
• No cutting, drilling, or special modifications needed.
• Suitable for use in various automotive, marine, and trailer applications requiring high-strength fasteners.

What's Included

• Complete set of ARP Hex Bolts, M8 x 1.25, 40mm underhead length, black oxide finish.
• High-quality packaging to prevent damage during shipping.
• Instruction sheet with torque specifications and installation tips.

Ideal For

• Automotive enthusiasts performing engine rebuilds or custom modifications.
• Marine applications requiring corrosion-resistant fasteners.
• Trailer and equipment assembly where high-strength hardware is essential.
• Professionals and DIYers seeking reliable, high-performance fasteners for demanding environments.

Emissions Note

These ARP Hex Bolt Kits are designed for high-performance and durability, but they are not specifically certified for emissions compliance. Always verify local regulations before use in emissions-critical applications.