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ARP (Automotive Racing Products) makes the strongest fasteners in motorsport — head studs, main studs, rod bolts, and flexplate bolts used by every Formula 1, NHRA, NASCAR, and championship motorsport program. Aerospace-grade alloys, exact-fit machining.
When every detail in your engine build matters, choose Auto Racing Products. These 5/16 ID x .675 OD flat washers are engineered to deliver consistent clamping force and structural integrity. Built from high-strength chromoly steel, these washers are designed to withstand the intense vibration and thermal cycling found in high-performance racing engines.
The wider .675 OD provides an increased surface area, which is essential for distributing pressure evenly across mounting surfaces, reducing the risk of galling or material fatigue. The black oxide coating ensures these washers remain protected from the elements, maintaining their integrity even in harsh conditions. These washers are a staple for professional engine builders who refuse to compromise on quality. By choosing ARP, you are investing in the gold standard of racing fasteners. Whether you are upgrading your cylinder head hardware or securing intake components, these washers provide the peace of mind you need on the track. Explore our extensive selection of professional-grade automotive hardware available at GGCRACING.
Other popular Auto Racing Products products customers consider together:
ARP (Automotive Racing Products) makes the strongest fasteners in motorsport — head studs, main studs, rod bolts, and flexplate bolts used by every Formula 1, NHRA, NASCAR, and championship motorsport program. Aerospace-grade alloys, exact-fit machining.
When every detail in your engine build matters, choose Auto Racing Products. These 5/16 ID x .675 OD flat washers are engineered to deliver consistent clamping force and structural integrity. Built from high-strength chromoly steel, these washers are designed to withstand the intense vibration and thermal cycling found in high-performance racing engines.
The wider .675 OD provides an increased surface area, which is essential for distributing pressure evenly across mounting surfaces, reducing the risk of galling or material fatigue. The black oxide coating ensures these washers remain protected from the elements, maintaining their integrity even in harsh conditions. These washers are a staple for professional engine builders who refuse to compromise on quality. By choosing ARP, you are investing in the gold standard of racing fasteners. Whether you are upgrading your cylinder head hardware or securing intake components, these washers provide the peace of mind you need on the track. Explore our extensive selection of professional-grade automotive hardware available at GGCRACING.
Other popular Auto Racing Products products customers consider together:
