ARP Hex Bolt Kits

1/4˝-20 SAE Bolt Kit for Automotive, Marine, and Trailer Applications

Part #: 650-1000

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 specially heat-treated 8740 chromoly steel, these bolts offer exceptional durability and tensile strength, making them an ideal choice for enthusiasts and professionals who demand the best in performance and safety. Whether you're assembling engine components, securing trailer parts, or performing custom modifications, these ARP bolts deliver peace of mind with their superior material properties and precise manufacturing.

Perfect for those who seek to upgrade their hardware with high-grade fasteners, the ARP Hex Bolt Kits ensure a secure fit and long-lasting performance. Their black oxide finish not only enhances corrosion resistance but also provides a sleek, professional appearance in your engine bay or project build. Designed to support demanding applications, these bolts help you achieve optimal safety margins and reliable torque retention, supporting your vehicle’s performance and longevity.

Key Features

ARP Hex Bolt Kits are engineered with a focus on strength, quality, and versatility. The key features include:

• Constructed from heat-treated 8740 chromoly steel, offering a tensile strength of approximately 180,000 psi for maximum durability and safety.
• Designed with a flanged hex head for easy installation and secure tightening using standard tools.
• Nominally rated at 1/4˝-20 thread size, suitable for a variety of fastener needs across automotive, marine, and trailer projects.
• Underhead length of 1.000 inch, providing ample grip and holding power for most standard applications.
• Black oxide finish enhances corrosion resistance and provides a professional, finished look.
• Precision manufacturing ensures consistent thread pitch and fitment, reducing installation time and improving reliability.
• Ideal for high-stress applications where strength and safety are critical, such as engine assembly, suspension components, or trailer hardware.
• Compatible with a wide range of vehicles and equipment requiring 1/4˝-20 fasteners, making it a versatile choice for custom builds and repairs.
• Meets or exceeds industry standards for quality and performance, ensuring your hardware maintains integrity under demanding conditions.

Construction & Design

The ARP Hex Bolt Kits are meticulously manufactured from 8740 chromoly steel, a material renowned for its excellent strength-to-weight ratio and toughness. The bolts undergo a specialized heat treatment process to achieve a tensile strength of approximately 180,000 psi, providing a significant safety margin over standard Grade 8 hardware. The flanged hex head design allows for easy installation and secure torque application, reducing the risk of stripping or slippage during assembly.

The black oxide finish not only adds a sleek appearance but also offers enhanced corrosion resistance, making these bolts suitable for both indoor and outdoor environments. The precise threading and underhead length ensure a consistent fit, reducing the risk of loosening or failure over time. Whether used in high-performance engines, trailer couplings, or marine hardware, these bolts are built to withstand harsh conditions and demanding applications.

Performance & Reliability

With a tensile strength of 180,000 psi, these ARP chromoly bolts provide a substantial safety margin and support increased load capacity compared to standard hardware. Their high-quality construction ensures consistent clamping force and resistance to elongation or fatigue. The durable black oxide finish helps prevent rust and corrosion, maintaining strength and appearance over time. These bolts are ideal for applications where reliability and safety are paramount, giving you confidence in your assembly and repairs.

Installation & Fitment

The ARP Hex Bolt Kits are designed for straightforward, bolt-on installation. They utilize standard 1/4˝-20 threads and feature a flanged hex head for easy tightening with common tools. No special modifications or tuning are required, making them suitable for both professional mechanics and DIY enthusiasts. Ensure proper torque specifications are followed during installation to maximize performance and safety. These bolts are compatible with a wide range of vehicles and equipment that require 1/4˝-20 fasteners, making them a versatile addition to your toolkit.

• Easy to install with standard wrenches or sockets
• No cutting, drilling, or special tools required
• Suitable for high-stress automotive, marine, and trailer applications

What's Included

• Complete set of ARP Hex Bolts in the specified size and length
• High-quality hardware designed for durability and performance
• Instruction sheet for proper installation and torque specifications

Ideal For

• Automotive enthusiasts performing engine or chassis upgrades
• Marine applications requiring corrosion-resistant fasteners
• Trailer builders and repair professionals
• Custom fabrication projects demanding high-strength hardware

Emissions Note

The ARP Hex Bolt Kits are intended for use in non-emissions-critical applications and are not certified for use in emissions-controlled environments. Always verify local regulations before installation.