Hex Nut - 1/2-20 (1)

The Hex Nut - 1/2-20 from ARP is a precision-engineered fastener designed for high-performance engine builds, racing applications, and critical assembly work where thread security and reliability are non-negotiable. This 1/2-inch diameter nut with a 20 threads-per-inch (TPI) pitch is manufactured to exacting tolerances and serves as a dependable component in systems requiring superior clamping force and vibration resistance. Whether you're assembling an engine block, securing structural components, or completing a professional-grade rebuild, this fastener delivers the consistency that separates production-quality builds from amateur work.

Constructed from chromoly steel and finished in black oxide coating, the Hex Nut - 1/2-20 provides exceptional corrosion resistance and durability under demanding conditions. The black oxide finish not only protects against rust and oxidation but also provides a clean, professional appearance suitable for engine compartments and high-visibility assemblies. The 3/4-inch hex head geometry offers excellent wrench clearance and torque application, reducing the risk of fastener slippage during installation or high-vibration operation. Chromoly's superior strength-to-weight ratio makes it the preferred material for motorsports and performance applications where reliability cannot be compromised.

This fastener is ideal for engine builders, race teams, and performance enthusiasts working with critical threaded assemblies that demand tight tolerances and long-term stability. The 1/2-20 thread specification is commonly used in automotive engine work, particularly in cylinder head bolting, structural brackets, and high-stress connection points where standard fasteners would be inadequate. Installation is straightforward—simply match with corresponding 1/2-20 studs or bolts and torque to manufacturer specifications for your application. Each nut is sold individually, allowing you to purchase exact quantities needed for your project without waste.