ARP Hex Bolt Kits

2011–2025 Subaru Forester / Subaru Impreza 5/16˝-18 SAE Bolt Kit

Part #: 651-1000

Overview

The ARP Hex Bolt Kits are high-quality fasteners designed for automotive, marine, and trailer applications where strength and durability are critical. Crafted from premium chromoly steel and heat-treated for maximum performance, these bolts provide a reliable solution for enthusiasts and professionals seeking to upgrade or replace factory hardware. Whether you're working on a daily driver, a performance build, or a heavy-duty project, these ARP bolts ensure a secure and long-lasting connection.

Ideal for those who demand the best in fastener technology, the ARP Hex Bolt Kits deliver enhanced safety margins and superior tensile strength compared to standard hardware. Their black oxide finish not only offers corrosion resistance but also provides a sleek, professional appearance. These bolts are perfect for applications requiring high strength and reliability, including engine components, suspension parts, and custom fabrication projects.

Key Features

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

• Manufactured from heat-treated 8740 chromoly steel, providing exceptional strength and toughness.
• Nominal tensile strength of 180,000 psi, offering a significant safety margin over Grade 8 hardware.
• Black oxide finish enhances corrosion resistance and provides a professional, finished look.
• Flanged hex head design ensures a secure grip and even load distribution during tightening.
• Precisely machined threads and underhead length of 1.000 inch for consistent fitment and performance.
• Designed for versatile use on cars, boats, trailers, and other heavy-duty applications requiring high-strength fasteners.
• Suitable for both OEM replacement and custom fabrication projects where reliability is paramount.
• Easy to install with standard tools, making them accessible for both professional mechanics and DIY enthusiasts.
• Backed by ARP's reputation for quality and precision manufacturing, ensuring peace of mind in critical applications.

Construction & Design

The ARP Hex Bolt Kits feature a robust construction utilizing 8740 chromoly steel, a material renowned for its strength and fatigue resistance. The bolts are carefully heat-treated to achieve a tensile strength of 180,000 psi, ensuring they can withstand demanding loads and stresses encountered in automotive and marine environments. The flanged hex head design provides a secure grip with a standard wrench or socket, facilitating straightforward installation and removal.

The black oxide finish not only enhances corrosion resistance but also minimizes glare and provides a sleek appearance suitable for high-performance applications. The precise threading and underhead length of 1.000 inch ensure a consistent and reliable fit across various applications, making these bolts a versatile choice for many projects. ARP's manufacturing process emphasizes quality control, resulting in fasteners that meet or exceed industry standards for strength and durability.

Performance & Reliability

Designed to provide a substantial safety margin, these chromoly bolts are ideal for critical fastening points where failure is not an option. Their high tensile strength ensures they can support increased loads, making them suitable for high-performance builds, off-road vehicles, and heavy-duty equipment. The heat treatment process enhances fatigue life, allowing these bolts to endure repeated stress cycles without compromising integrity.

Installation & Fitment

The ARP Hex Bolt Kits are designed for straightforward installation using standard hand tools. They are intended to replace or upgrade existing hardware without the need for modifications. The bolts fit standard 5/16˝-18 threaded holes and feature a flanged hex head that provides a secure grip during tightening. No special tools or procedures are required, and the bolts can be torqued to manufacturer specifications for optimal safety and performance.

These bolts are suitable for a wide range of applications, including engine assembly, suspension components, and structural fastenings. Always verify the thread size and length to ensure compatibility with your specific project.

What's Included

• Complete set of ARP Hex Bolts, 5/16˝-18 x 1.000 inch, made from heat-treated chromoly steel
• High-quality hardware designed for durability and reliable performance
• Instruction sheet for proper installation and torque specifications

Ideal For

• Automotive enthusiasts upgrading or replacing factory fasteners
• Performance and racing applications requiring high-strength hardware
• Marine and trailer projects demanding corrosion-resistant fasteners
• Heavy-duty fabrication and custom builds where safety and reliability are critical