Exhaust Header Stud Kit ARP Grade 8 Hex Bolt

Description

Product Overview

ARP’s exhaust header stud kit is engineered for professionals and serious enthusiasts who demand reliability under extreme conditions. Each stud is forged from premium alloy steel and meets Grade 8 specifications, delivering a tensile strength of approximately 170,000 PSI. The 3/8‑inch diameter, right‑hand thread (UNC) design ensures a precise fit with standard header flanges, while the painted exterior finish protects against rust and corrosion. The kit includes twelve 1.670‑inch long studs, matching hex nuts, and high‑quality washers, providing a complete fastening solution right out of the box.

Usage

This stud kit is intended for performance exhaust header installations on a wide range of vehicles, from street‑legal sports cars to track‑day machines. It excels in high‑heat environments where traditional fasteners may loosen or degrade. Install the studs when assembling tubular headers, manifolds, or aftermarket exhaust systems to achieve a torque‑retaining, leak‑free connection. The kit is also suitable for replacement of worn or damaged factory studs, extending the service life of your exhaust assembly.

Why Choose Us

ARP combines decades of engineering expertise with rigorous quality control to produce fasteners that outperform standard OEM parts. The proprietary stainless 300 steel alloy used in these studs offers superior resistance to oxidation, ensuring long‑term durability even in salty or humid climates. Each component undergoes heat treatment and precision machining to meet exacting tolerances, guaranteeing consistent torque values and eliminating the risk of thread stripping. When you choose ARP, you receive a product backed by a reputation for performance and safety in motorsports worldwide.

Key Features

• Grade 8 alloy steel studs rated at 170,000 PSI for maximum strength.
• 3/8″ diameter with 1.670″ overall length, compatible with most performance headers.
• Painted finish provides corrosion resistance and a clean, professional appearance.
• Complete kit includes twelve studs, matching hex nuts, and premium washers.
• Right‑hand UNC thread (3A/3B) ensures a secure, torque‑retaining fit.

FAQ

What makes Grade 8 studs stronger than standard Grade 5 hardware?

Grade 8 fasteners are heat‑treated to achieve a higher tensile strength, typically around 170,000 PSI, compared to roughly 120,000 PSI for Grade 5. This increased strength reduces the likelihood of stretching or failure under high‑load, high‑temperature conditions common in performance exhaust systems.

Can these studs be used on both steel and stainless‑steel headers?

Yes. The 3/8″ UNC thread profile is standard for most aftermarket steel and stainless‑steel headers. The polished stainless 300 steel construction of the studs further minimizes galvanic corrosion when paired with stainless‑steel components.

Do I need any special tools to install the ARP stud kit?

Installation requires a standard 3/8″ hex socket or wrench for the nuts and a torque wrench to achieve the recommended torque specifications (typically 70–80 lb‑ft). No proprietary tools are needed.

How do I prevent the studs from loosening over time?

Apply the correct torque and use the included washers to distribute load evenly. ARP’s proprietary alloy and painted coating also help maintain clamping force by resisting thermal expansion and corrosion.

Is this kit compatible with my vehicle’s factory warranty?

ARP fasteners are designed to meet or exceed OEM specifications, and many manufacturers accept them as direct replacements. However, it is advisable to verify warranty terms with your vehicle’s dealer before installation.