3/8-16 x 1 Zinc Socket Head Bolt

The 3/8-16 x 1 Zinc Socket Head Bolt by March Performance is an essential fastening component for automotive enthusiasts and mechanics tackling engine builds, transmission work, and custom modifications. These precision socket head cap screws provide a clean, professional appearance while delivering reliable clamping force in high-vibration environments like engine bays and underhood assemblies. Whether you're assembling performance heads, intake manifolds, or drivetrain components, this fastener offers the repeatability and finish quality that serious builders demand.

Constructed from zinc-plated steel, the 3/8-16 x 1 socket head bolt resists corrosion while maintaining a consistent, visually appealing aesthetic under engine covers and in engine bays exposed to moisture and salt spray. The metric thread specification (3/8-16) delivers precise engagement without stripping, and the 1-inch length accommodates typical aluminum head and intake manifold applications without excess protrusion. The socket head design allows you to apply controlled torque using a hex wrench, minimizing the risk of fastener damage compared to traditional slotted or Phillips heads, and the low-profile cap sits flush against aluminum and steel surfaces.

Professional engine builders and street performance shops standardize on March Performance hardware for its consistent fit and finish across complete engine packages. These bolts excel in head gasket applications, intake plenum fastening, and valve cover installations where corrosion resistance and appearance matter equally. Always follow your engine build specifications and apply appropriate threadlocker when securing critical fasteners, and verify torque specs against your engine manufacturer's guidelines to ensure safe, leak-free assemblies.