5/16"-18 x 2‑1/4" Socket Head Cap Screw, Alloy Steel, Thermal Black Oxide (USA)

This USA‑made 5/16"-18 x 2‑1/4" socket head cap screw is manufactured from high‑strength alloy steel to provide reliable fastening for machinery, tooling, equipment assembly, and precision industrial applications. The thermal black oxide finish enhances corrosion resistance, improves lubricity, and delivers a uniform, low‑glare appearance without affecting dimensional accuracy.Designed with a hex socket drive for superior torque transfer and a stable, vibration‑resistant fit, this longer‑length fastener is ideal for assemblies requiring extended reach while maintaining strength and precision. Its American‑made construction ensures clean, consistent threading, excellent durability, and dependable long‑term performance in demanding environments.