3/8-16 12pt. Nuts (10)

ARP 3/8-16 12-Point Nuts in a set of 10 deliver precision fastening for high-performance engine builds, race applications, and demanding mechanical assemblies. These chromoly construction nuts feature a 7/16-inch 12-point head and black oxide finish, engineered to withstand the vibration and load cycles typical of competitive motorsports, street performance, and industrial equipment where standard fasteners fall short.

The 3/8-16 thread specification indicates a 3/8-inch diameter with 16 threads per inch, a common standard for engine block fasteners, intake manifolds, and other critical applications where thread density matters. Chromoly (chromium-molybdenum alloy) provides superior tensile strength and fatigue resistance compared to standard steel, reducing the risk of fastener failure under thermal cycling and sustained load. The black oxide coating protects against corrosion while maintaining a professional appearance on engine bays and visible assemblies. The 12-point head geometry offers compatibility with both standard and metric socket drives, simplifying installation and removal during assembly and maintenance.

Buyers restoring classic engines, building race motors, or upgrading aging fastener sets rely on ARP fasteners for their proven track record in high-stress environments. This 10-piece set covers a single critical area—such as a cylinder head bolt circle or intake manifold mounting pattern—making it an efficient choice for targeted upgrades or complete engine overhauls where fastener integrity directly impacts reliability and longevity.

ARP remains the industry standard for performance fastening systems across motorsports, marine, and specialty equipment sectors where margin for failure is zero.