1/2-20 12pt. Nut (1)

The 1/2-20 12pt. nut from ARP is a precision fastener engineered for high-performance engine builds and critical mechanical assemblies where reliability and thread security are non-negotiable. Designed for applications requiring superior clamping force and vibration resistance, this chromoly nut serves automotive enthusiasts, engine builders, and industrial technicians who demand fasteners that withstand extreme conditions. The 12-point head design provides multiple engagement angles, making it an essential component in racing engines, competition platforms, and any build where fastener integrity directly impacts performance and safety.

Manufactured from chromoly steel and finished in black oxide, the 1/2-20 12pt. nut delivers exceptional strength-to-weight characteristics that exceed standard hardware store fasteners. The 1/2-20 thread specification ensures compatibility with ARP studs and premium fastener systems commonly found in engine blocks, cylinder heads, and high-load structural joints. Chromoly's superior tensile strength allows this nut to maintain clamp load under thermal cycling and vibration, critical factors in forced-induction and high-RPM applications. The black oxide coating provides corrosion resistance while maintaining a professional appearance and preventing galling during installation and removal cycles.

This fastener is ideal for builders restoring or upgrading engine assemblies, particularly those installing ARP fastener kits designed for maximum reliability. The 12-point head accommodates both standard and specialized fastener tools, offering flexibility during engine teardown and assembly. Installation with proper torque specifications and thread locking compounds ensures optimal performance and prevents loosening under load. Whether you're completing a full engine rebuild, upgrading critical fasteners, or replacing damaged hardware, the 1/2-20 12pt. nut provides the quality and durability expected from ARP's reputation in precision fastener engineering.