Bolt Kit - 6pt. (5pk) 1/2-20 x 4.500

The ARP Bolt Kit – 6 Point (5 Pack) 1/2-20 x 4.500 is a premium fastening solution engineered for critical applications where fastener reliability is non-negotiable. This five-piece set of chromoly bolts delivers the tensile strength and fatigue resistance required in high-stress mechanical assemblies. Each bolt features a 9/16-inch hex head, black oxide finish for corrosion resistance, and precise 1/2-20 thread specification suited for demanding industrial and motorsports environments.

The 4.5-inch length and chromoly material composition make these fasteners ideal for engine block assembly, transmission mounting, and structural reinforcement where vibration isolation and load distribution matter. Black oxide coating provides a thin, hard protective layer that resists oxidation in both dry storage and moderate humidity conditions. The 1/2-20 thread pitch is standard across heavy-duty automotive and industrial specifications, ensuring compatibility with pre-drilled and tapped holes in existing assemblies. Universal design means these bolts integrate seamlessly into custom fabrication, engine rebuilds, and mechanical restoration projects without requiring adapter components.

Buyers sourcing fasteners for performance engines, transmission work, or structural repair appreciate the predictable performance of chromoly under thermal cycling and dynamic loads. The five-bolt quantity provides enough coverage for a complete assembly job or replacement set without excess inventory. This kit addresses the specific fastener needs of mechanics, fabricators, and enthusiasts who prioritize verified material properties and finish integrity over generic alternatives.

ARP is recognized across motorsports and high-performance assembly for fastener engineering that meets or exceeds OEM specifications. The 1/2-20 x 4.500 size strikes a practical balance for both engine bays and transmission cases, making this kit a reference standard for shops handling multiple platform rebuilds.