S/S Bolt Kit - 12pt. (5) 1/4-20 x .515

The ARP Stainless Steel Bolt Kit – 12pt (5) 1/4-20 x .515 is a precision fastening solution designed for demanding applications where corrosion resistance and structural integrity are non-negotiable. This five-piece kit delivers polished stainless steel construction, ideal for operators who require dependable hardware across engine builds, component assembly, and field repairs where exposure to moisture or harsh environments demands superior material performance.

Each bolt features a 1/4-20 thread specification with a 0.515-inch length and 5/16-inch 12-point head geometry, delivering uniform clamping force and compatibility with standard fractional tooling. The 12-point head design distributes load across a wider contact area compared to traditional 6-point fasteners, reducing surface stress during installation and removal. Stainless construction eliminates the corrosion concerns inherent to mild steel fasteners, making this kit suitable for marine environments, outdoor equipment, and long-term storage applications where rust degradation would compromise assembly integrity.

Precision mechanics, automotive enthusiasts, gunsmiths, and equipment maintenance teams rely on ARP fasteners for critical assembly work. This five-bolt configuration addresses component-level rebuilds where OEM fastener replacement ensures factory-spec performance and longevity. The polished finish provides both aesthetic quality and a smooth surface that resists galling during installation—a practical advantage when working with aluminum or titanium receivers where fastener seizing can compromise expensive components.

ARP bolts are recognized across the precision assembly industry for consistent dimensional tolerance and material certification. These stainless fasteners serve as drop-in replacements for standard hardware in upper receiver builds, action screw applications, and accessory mounting where reliability cannot be compromised. Five bolts per kit ensures adequate inventory for multiple assemblies or future maintenance cycles.