ARP Hex Bolt Kits

2011–2025 Subaru Forester / Subaru Impreza 2.0L Turbo / 2.5L Engine

Part #: 661-1006

Overview

The ARP Hex Bolt Kits are high-quality fasteners designed to provide reliable, durable, and precise fastening solutions for a wide range of automotive applications. Crafted from premium materials and engineered for strength, these bolts are ideal for enthusiasts and professionals seeking to enhance the safety and integrity of their vehicle assemblies. Whether you're working on engine components, suspension parts, or custom builds, ARP's bolt kits deliver peace of mind with their superior tensile strength and heat-treated construction.

If you're looking to upgrade your vehicle's hardware with fasteners that combine strength, corrosion resistance, and precision fitment, the ARP Hex Bolt Kits are an excellent choice. They are especially suited for performance applications where safety margins and durability are critical, such as high-performance engines, off-road builds, or race cars. These bolts help ensure your components stay securely fastened under demanding conditions, supporting your vehicle's reliability and performance.

Key Features

ARP Hex Bolt Kits incorporate several advanced features that set them apart from standard hardware. Crafted from ARP's proprietary 8740 chromoly steel, these fasteners are heat-treated to achieve a tensile strength of 180,000 psi, providing a significant safety margin over typical Grade 8 hardware. The black oxide finish not only enhances corrosion resistance but also gives the bolts a sleek, professional appearance. The flanged hex head design ensures easy installation and removal with standard tools, while the M8 x 1.25 thread size offers compatibility with a wide range of automotive components.

• Manufactured from premium 8740 chromoly steel for exceptional strength and durability.
• Heat-treated to 180,000 psi tensile strength for maximum safety margin.
• Black oxide finish provides corrosion resistance and a clean look.
• Flanged hex head design for easy installation and secure torque application.
• Nominal thread size of M8 x 1.25, compatible with many automotive applications.
• Ideal for engine assembly, suspension, and other critical fastener points.
• Designed for both professional mechanics and performance enthusiasts.

Construction & Design

The ARP Hex Bolt Kits are meticulously engineered using ARP's proprietary 8740 chromoly steel, a material renowned for its high strength-to-weight ratio and excellent fatigue resistance. Each bolt undergoes a precise heat-treating process to optimize its mechanical properties, ensuring consistent performance under stress. The flanged hex head allows for a secure grip with standard wrenches or sockets, reducing the risk of stripping or slipping during installation.

The black oxide coating not only enhances corrosion resistance but also provides a professional, finished appearance suitable for both show and go applications. The design features a nominal M8 x 1.25 thread pitch, making these bolts compatible with a wide range of automotive components, from engine internals to chassis fasteners. Their robust construction ensures they maintain clamping force over time, even in demanding environments.

Performance & Reliability

Built for performance and safety, these ARP fasteners are engineered to withstand high-stress conditions typical of spirited driving, off-road adventures, and racing. The high tensile strength of 180,000 psi ensures that these bolts can support increased loads and prevent failure where standard hardware might stretch or break. Their corrosion-resistant finish helps maintain integrity over time, even in harsh environments.

Installation & Fitment

Installing the ARP Hex Bolt Kits is straightforward, thanks to their standard flanged hex head design. They are designed as direct replacements for OEM fasteners in compatible applications, requiring no modifications or special tools beyond standard hand or power wrenches. Proper torque specifications should be followed to ensure optimal clamping force and safety. No additional machining or adjustments are necessary, making these bolts a reliable upgrade for your vehicle.

• Easy bolt-on installation with common hand tools.
• No cutting, drilling, or special modifications required.
• Suitable for use in engine assemblies, suspension components, and other critical areas.

What's Included

• Complete set of ARP Hex Bolts in the specified size and quantity.
• Installation instructions and torque specifications (if applicable).

Ideal For

• Performance enthusiasts seeking high-strength fasteners for engine and chassis assembly.
• Professional mechanics requiring reliable hardware for rebuilds and upgrades.
• Off-roaders and racers demanding durable, corrosion-resistant fasteners under extreme conditions.

Emissions Note

These ARP Hex Bolt Kits are designed for off-road or racing use only and are not certified for use on public roads or in emissions-compliant applications. Please verify your local regulations before installation.