ARP Hex Bolt Kits

2011–2025 Subaru Forester / Subaru Impreza / Subaru WRX M8 x 1.25

Part #: 661-1012

Overview

The ARP Hex Bolt Kits are high-performance fasteners designed to meet the demanding needs of automotive enthusiasts, racers, and professionals who require reliable, durable, and precision-engineered hardware. Crafted from premium materials, these bolts are ideal for a wide range of applications on cars, boats, and trailers, ensuring secure and long-lasting connections.

Whether you're assembling engine components, mounting accessories, or performing custom modifications, these ARP bolts provide the strength and safety margin needed for both daily driving and high-performance scenarios. Their superior tensile strength and heat-treated construction make them a trusted choice for those seeking quality and peace of mind in their hardware.

Key Features

ARP Hex Bolt Kits are engineered with precision and durability in mind, offering several key advantages:

• Manufactured from heat-treated 8740 chromoly steel, providing exceptional strength and toughness for demanding applications.
• Black oxide finish enhances corrosion resistance and gives a sleek, professional appearance.
• Nominal tensile strength of 180,000 psi ensures a substantial safety margin over standard Grade 8 hardware, making these bolts suitable for high-stress environments.
• Flanged hex head design allows for easy installation and removal with standard tools, reducing the risk of stripping or damage.
• Precisely machined threads (M8 x 1.25) ensure a perfect fit and optimal clamping force.
• Underhead length of 75mm provides versatile application options across various components and assemblies.
• Designed for use in automotive, marine, and trailer applications where high strength and reliability are critical.
• Manufactured to strict quality standards, ensuring consistent performance and safety.
• Ideal for enthusiasts and professionals who demand the best in fastener technology and performance.

Construction & Design

The ARP Hex Bolt Kits feature a robust construction utilizing heat-treated 8740 chromoly steel, a material renowned for its high strength-to-weight ratio and durability. The black oxide finish not only provides corrosion resistance but also reduces glare and enhances the bolt's appearance. The flanged hex head design simplifies installation and ensures a secure grip during tightening or removal.

Each bolt is machined to precise specifications, ensuring a perfect thread fit and consistent clamping force. The 75mm underhead length offers versatility, accommodating a variety of applications without compromising strength or integrity. These design choices make the ARP bolts suitable for both high-performance racing and everyday use, providing confidence that your components are securely fastened under demanding conditions.

Installation & Fitment

Installing the ARP Hex Bolt Kits is straightforward, thanks to their standard metric M8 x 1.25 thread size and flanged hex head. These bolts are designed to bolt directly into compatible threaded holes without the need for modifications. No cutting, drilling, or special tuning is required, making them a perfect upgrade or replacement for OEM hardware.

• Simply tighten to the manufacturer's recommended torque specifications for optimal safety and performance.
• Suitable for a wide range of automotive and marine applications where high-strength fasteners are required.

What's Included

• Complete set of ARP Hex Bolts with M8 x 1.25 threads
• Black oxide finish for corrosion resistance
• Installation instructions (if provided)

Ideal For

• Automotive enthusiasts performing engine builds or modifications
• Marine applications requiring high-strength fasteners
• Trailer assembly and repair
• Professionals and racers seeking reliable hardware for demanding environments