Bolt Kit - 6pt 5pk 1/4-20 x 4.500

The Bolt Kit - 6pt 5pk 1/4-20 x 4.500 from ARP represents the gold standard for critical fastening in high-performance engine builds and structural modifications. Whether you're assembling a stroker motor, securing cylinder head components, or reinforcing suspension geometry, this five-piece kit delivers the tensile strength and reliability that serious enthusiasts demand. ARP fasteners are engineered for repeatability—critical when you're working with aluminum heads, forged pistons, or modified blocks that cannot tolerate fastener failure.

Each bolt in this kit features a 1/4-20 thread specification with a 4.500-inch length, sized for mid-range clamping applications where standard fasteners fall short. The 6-point head design minimizes corner rounding—a common failure point when using 12-point heads on worn or high-vibration assemblies—ensuring consistent torque application and reduced risk of fastener slippage under boost or load cycling. ARP fasteners undergo rigorous material processing and heat treatment to achieve uniform hardness and tensile properties, eliminating weak links in your assembly. The precise dimensional tolerances mean zero guesswork when calculating preload or stretch values for torque specifications.

This kit suits engine builders, fabricators, and DIY mechanics tackling cylinder head studs, intake manifold securement, or custom bracket fabrication on street, track, and competition builds. The 1/4-20 thread diameter and 4.5-inch length align with common OEM and aftermarket applications across domestic and import platforms. Always reference your specific engine manual or ARP technical data for proper torque specifications—each fastener class has unique stretch requirements that directly impact seal integrity and component longevity. Stock five bolts per kit for redundancy and future service intervals.