Black Half Nuts 1/2-20 10pk

The Black Half Nuts 1/2-20 10-pack from Allstar Performance is a precision fastening solution engineered for serious engine builders, race mechanics, and automotive enthusiasts tackling high-performance engine assembly. Half nuts are essential components in any mechanic's toolkit when working with threaded fasteners that require secure, repeatable installation without stripping or cross-threading. Whether you're assembling a fresh block, installing cylinder head studs, or securing critical engine bay hardware, these fasteners deliver the reliability that separates professional builds from amateur mistakes.

Manufactured to exacting standards, the Black Half Nuts feature a 1/2-20 thread specification, meaning 1/2-inch diameter studs with 20 threads per inch—the industry standard for many engine block applications and performance fastening systems. The black oxide finish provides corrosion resistance and a professional appearance while protecting against rust in engine bay environments where moisture and temperature cycling occur. The half-nut design allows controlled threading onto studs or rods without the risk of damaging delicate threads, making them indispensable for dial-in assembly procedures common in engine building, stroker builds, and competition applications.

This 10-pack quantity covers multiple assembly stations or provides backup fasteners for recurring builds, making it ideal for shops, race teams, and dedicated enthusiasts who maintain consistent inventory. The compact, lightweight package (0.23 lbs) stores easily in toolboxes or workbenches. Half nuts are compatible with any 1/2-20 threaded studs, making them universally applicable across domestic and import engine platforms—from small-block Chevys to late-model modular builds and everything in between. Professional mechanics rely on Allstar Performance for quality assurance, and this 10-pack ensures you have the right tool on hand every time you face a critical fastening challenge.