S/S Bolt Kit - 12pt. (5) 3/8-24 x 1.250

The S/S Bolt Kit - 12pt. (5) 3/8-24 x 1.250 from ARP represents the gold standard for fastener upgrades in serious automotive applications. Whether you're building a high-performance engine, upgrading suspension geometry, or securing critical drivetrain components, this stainless steel bolt kit delivers the reliability that separates a durable build from a liability on the track or street. ARP's reputation for precision-engineered fasteners makes this kit essential for engine builders, fabricators, and enthusiasts who refuse compromise on clamping integrity.

Constructed from premium stainless steel, these bolts feature 12-point heads that distribute load across a larger contact surface compared to 6-point alternatives, reducing fastener wear and slippage under vibration. The 3/8-24 thread pitch provides fine-thread geometry—ideal for applications demanding precise torque values and reduced thread stripping risk in aluminum or composite materials. Each bolt measures 1.250 inches in length, making them suitable for shallow counterbores, thin flanges, and compact engine bay configurations where standard fasteners fall short. The five-piece count allows for targeted upgrades to critical assemblies without overbuying inventory.

This kit excels in custom engine builds, turbocharger mounting brackets, intake manifold securement, and any high-stress fastening scenario where corrosion resistance and tensile strength matter. Fabricators and performance shops favor ARP bolts for their ability to handle repeated thermal cycling and maintain preload under load reversal—critical for turbocharged and supercharged applications. Installation requires standard hex or 12-point sockets and proper torque specifications per ARP's published guidelines; always apply anti-seize compound to stainless fasteners when threading into aluminum to prevent galling. Compatible with any automotive assembly using 3/8-24 fine-thread specification.