ARP Hex Bolt Kits

2011–2025 Subaru Forester / Subaru Impreza / Subaru WRX 8mm x 1.25mm Hex Head Bolts

Part #: 661-1019

Overview

The ARP Hex Bolt Kits are premium-quality fasteners designed to provide reliable, high-strength connections for a wide range of automotive, marine, and trailer applications. Crafted from heat-treated chromoly steel, these bolts are engineered to withstand demanding conditions and deliver exceptional durability. Whether you're assembling engine components, securing suspension parts, or performing custom modifications, these ARP bolts offer peace of mind with their superior tensile strength and precision manufacturing.

Ideal for enthusiasts and professionals alike, these hex bolts are perfect for those seeking to upgrade their hardware with components that combine strength, reliability, and corrosion resistance. Their black oxide finish not only enhances appearance but also provides a layer of protection against rust and corrosion, ensuring long-lasting performance in various environments.

Key Features

ARP Hex Bolt Kits feature several technical advantages that make them a top choice for high-performance applications:

• Manufactured from 8740 chromoly steel, known for its excellent strength-to-weight ratio and toughness.
• Heat-treated to a tensile strength of 180,000 psi, offering a significant safety margin over standard Grade 8 hardware.
• Precisely machined with a hex head design for easy installation and removal using standard tools.
• Underhead length of 115mm ensures proper thread engagement and secure fastening.
• Black oxide finish provides corrosion resistance and a sleek, professional appearance.
• Designed to meet or exceed industry standards for quality and durability.
• Suitable for a variety of automotive, marine, and trailer fastening needs where high strength is required.
• Compatible with M8 x 1.25 metric thread applications, common in many vehicle and equipment assemblies.
• Engineered for easy installation in tight spaces with a robust, reliable hold.

Construction & Design

The ARP Hex Bolt Kits are constructed from premium-grade 8740 chromoly steel, a material renowned for its exceptional strength and toughness. The bolts undergo a rigorous heat-treating process to achieve a tensile strength of 180,000 psi, ensuring they can handle high-stress environments without failure. The black oxide finish not only enhances corrosion resistance but also provides a professional, finished look suitable for both performance and restoration projects.

The hex head design allows for straightforward installation and removal using standard wrenches or sockets, making maintenance and adjustments hassle-free. The underhead length of 115mm ensures proper thread engagement, providing a secure and reliable fastening solution that maintains integrity even under vibration and dynamic loads. These features combine to create a fastener that is both durable and easy to work with, suitable for demanding automotive and industrial applications.

Installation & Fitment

Installing the ARP Hex Bolt Kits is straightforward and requires no special tools beyond standard wrenches or sockets. These bolts are designed to fit M8 x 1.25 threaded holes commonly found in automotive, marine, and trailer applications. No cutting, drilling, or special tuning is necessary, making them a perfect upgrade or replacement for OEM hardware. Always ensure proper torque specifications are followed during installation to maximize safety and performance.

• Simple bolt-on installation with standard tools
• Compatible with M8 x 1.25 threaded components
• No cutting, drilling, or tuning required

What's Included

• Complete set of ARP Hex Bolts (quantity as specified in packaging)
• All necessary hardware for installation
• Instruction sheet for proper torque and installation tips

Ideal For

• Automotive enthusiasts performing engine or chassis upgrades
• Marine applications requiring high-strength fasteners
• Trailer assembly and repair
• Custom fabrication projects demanding reliable hardware
• Professionals seeking durable, high-performance fasteners for demanding environments