Oval Head Quick Fastener 5/16 x .500

The Oval Head Quick Fastener 5/16 x .500 by Moroso is an essential component for engine builders, hot rodders, and serious mechanics tackling custom automotive projects. These fasteners are purpose-built for applications where speed of assembly and reliable clamping matter—whether you're securing intake manifolds, carburetor bases, or aluminum valve covers on high-performance engines. Quick fasteners eliminate the need for traditional bolts and washers, delivering faster builds without sacrificing holding power, making them a staple in fabrication shops and professional garages nationwide.

Moroso's oval head design features a self-centering, quick-connect mechanism that allows one-handed installation—a game-changer during engine assembly when accessibility is tight. The 5/16-inch diameter with a .500-inch grip range provides optimal clamping force for sheet metal, gasket stacks, and aluminum components without over-torquing or stripping threads. The fastener's tapered design ensures consistent pressure distribution, reducing vibration-induced loosening common in high-RPM or modified engines. Engineered for durability, these fasteners resist corrosion and maintain tension through thermal cycling, critical for street and race applications alike.

Technicians and engine builders rely on the Oval Head Quick Fastener 5/16 x .500 for manifold work, fuel system component mounting, and custom intake fabrication on carburetor and EFI platforms. The .500-inch stack height accommodates standard gasket thicknesses used in small-block and big-block applications, from street performance to all-out competition builds. Compatible with both ported and unported aluminum heads, these fasteners simplify the assembly process while maintaining professional-grade clamp load consistency—ideal for builders who demand repeatability and reliability in every build.