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

This USA‑made 5/16"-18 x 1‑1/4" socket head cap screw is produced from high‑strength alloy steel for dependable performance in machinery, tooling, equipment assembly, and precision industrial applications. The thermal black oxide finish enhances corrosion resistance, improves lubricity, and provides a uniform, low‑glare appearance while maintaining exact dimensional accuracy.Featuring a hex socket drive, this fastener offers secure torque transfer and a vibration‑resistant fit, making it ideal for high‑demand assemblies and tight installation spaces. With consistent American‑made quality, this screw delivers reliable threading, excellent durability, and long‑lasting strength in demanding environments.