5/16"-18 x 5/8" Socket Head Cap Screw, Alloy Steel, Thermal Black Oxide (USA)

This USA‑made 5/16"-18 x 5/8" socket head cap screw is manufactured from high‑strength alloy steel to provide dependable fastening for machinery, tooling, equipment assembly, and precision industrial applications. The thermal black oxide finish enhances corrosion resistance, improves lubricity, and delivers a clean, low‑glare appearance while maintaining accurate dimensional tolerances.Designed with a hex socket drive for superior torque transfer and a secure, vibration‑resistant fit, this fastener is ideal for installations requiring strength and reliability in a compact size. Its American‑made construction ensures consistent threading, excellent durability, and long‑lasting performance in demanding environments.