9/16-18 12pt. Nut (1)

The ARP 9/16-18 12pt. nut is a precision fastener engineered for high-performance engine builds and critical mechanical assemblies where reliability under load is non-negotiable. Designed for applications requiring superior clamping force and corrosion resistance, this chromoly construction nut serves builders, engine shops, and technicians who demand fasteners that maintain integrity under extreme conditions. Single-unit availability makes it ideal for replacement, repair, or completing custom builds where OEM fasteners fall short.

Manufactured from chromoly steel and finished with black oxide coating, the 9/16-18 12pt. nut delivers enhanced strength-to-weight ratio and superior corrosion protection compared to standard hardware-grade fasteners. The 12-point head design provides multiple engagement angles, reducing socket slip during installation and removal—critical when working on tight tolerances or recessed locations. The black oxide finish resists rust and oxidation while maintaining a professional appearance, and the 9/16-18 thread specification ensures compatibility with precision engine components and specialty applications where standard SAE or metric threading may not apply.

This nut is ideal for engine rebuilders, vintage or custom automotive projects, and precision machinery assembly where component matching is essential. Whether securing cylinder head fasteners, intake manifolds, or specialty brackets, the chromoly construction handles thermal cycling and vibration without loosening or stripping. Compatibility with 9/16-18 male threads makes verification straightforward; measure existing fastener pitch before ordering to ensure proper fit. The compact 0.05 lb weight reflects its precision engineering—suitable for weight-conscious builds where every component matters.