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

The ARP 1/2-20 12pt. nuts are precision-engineered fasteners designed for high-performance engine builds, race applications, and critical mechanical assemblies where reliability under stress is non-negotiable. Manufactured as a matched pair, these nuts deliver the consistent clamping force and structural integrity demanded by professional builders, fabricators, and motorsport enthusiasts who refuse compromise on fastener quality.

Each 1/2-20 nut features a 12-point head design that provides multiple engagement angles for socket contact, reducing the risk of fastener rounding and stripping during installation and removal. Constructed from chromoly steel and finished with black oxide coating, these fasteners resist corrosion while maintaining superior tensile strength compared to standard Grade 5 or 8 hardware. The black oxide surface treatment enhances durability in harsh environments and provides a professional appearance consistent with ARP's reputation for aerospace-grade fastening solutions.

These nuts excel in engine block assembly, cylinder head applications, and any critical joint where vibration resistance and load retention are essential. Professional engine builders and performance shops specify ARP fasteners because the 12-point geometry and chromoly construction eliminate galling and seizing, particularly when paired with ARP studs and bolts. The pair format is ideal for rebuilds, replacements, or completing custom builds where OEM fasteners fall short of performance standards.