ARP 640-1250 Black Oxide 1/4-20″ RH Thread 1.250″ UHL 12-Point Bolt with 5/16″ Socket and Washer, (Set of 5)

Description

Product Overview

The ARP 640-1250 is engineered for demanding automotive environments where reliability and strength are paramount. Each bolt in this five‑piece set features a 12‑point head that distributes torque evenly, reducing the risk of cam‑out during tightening. Constructed from premium alloy steel and finished with a durable black oxide coating, the bolts resist corrosion and maintain a sleek appearance even under high heat and exposure to fluids. The 1/4‑20 RH thread size matches a wide range of engine applications, while the included 5/16″ socket and washer simplify installation and ensure a secure, vibration‑resistant connection. Designed for both professional mechanics and dedicated hobbyists, this bolt set delivers the confidence needed for critical engine assembly, repair, and performance upgrades.

Usage

These bolts are ideally suited for securing cylinder heads, intake manifolds, exhaust manifolds, and other engine components that demand a high‑strength, corrosion‑resistant fastener. Whether you are rebuilding a classic muscle car, tuning a modern performance engine, or performing routine maintenance on a daily driver, the ARP 640-1250 provides the torque capacity and durability required for demanding applications. The black oxide finish not only offers protection against rust but also reduces glare, making it easier to inspect the fastener during assembly. The set’s compact packaging and lightweight design (2.53 ounces per bolt) make it convenient for on‑the‑road repairs, track day preparations, and workshop inventory. By using these bolts, technicians can achieve consistent clamping force, improve engine reliability, and extend the service life of critical components.

Why Choose Us

Choosing the ARP 640-1250 means selecting a product backed by decades of engineering expertise and a reputation for precision. ARP’s rigorous quality control processes ensure each bolt meets exacting standards for thread geometry, head angle, and material hardness. The black oxide coating is applied in a controlled environment to guarantee uniform thickness and optimal corrosion resistance. Our bolts are tested for tensile strength, shear resistance, and torque retention, providing peace of mind that they will perform under extreme conditions. Additionally, ARP offers comprehensive technical support, detailed installation guidelines, and a responsive customer service team ready to assist with any fitment questions. When you purchase this set, you receive not only a high‑quality component but also a partnership with a brand committed to your success on the road and the track.

Key Features

• Five 12‑point bolts deliver even torque distribution for secure fastening.
• Black oxide finish provides superior corrosion resistance and a professional appearance.
• 1/4‑20 RH thread matches a broad range of engine applications, ensuring a precise fit.
• Included 5/16″ socket and washer simplify installation and reduce the need for additional tools.
• Backed by ARP’s technical support and warranty for confidence in performance.

FAQ

What makes the black oxide coating special?

The black oxide coating is a conversion coating that enhances surface hardness and provides excellent resistance to rust and wear, especially in high‑temperature engine environments.

Can these bolts be used on non‑performance engines?

Yes, the ARP 640‑1250 bolts are suitable for both high‑performance and standard engines, offering reliable strength and durability for any application that requires a 1/4‑20 RH thread.

Do I need any special tools to install the bolts?

The set includes a 5/16″ socket that fits the bolt head perfectly, allowing you to install the bolts with a standard ratchet or torque wrench without additional adapters.

Are these bolts compatible with aftermarket parts?

Absolutely. The 1/4‑20 RH thread is a common size in the automotive aftermarket, making these bolts compatible with a wide variety of aftermarket manifolds, brackets, and accessories.

What warranty does ARP provide?

ARP offers a limited warranty that covers material defects and workmanship, ensuring that you receive a product that meets their high standards of quality and performance.