1"-8 x 3‑1/2" Socket Head Cap Screw, Alloy Steel, Thermal Black Oxide (USA)

This USA‑made 1"-8 x 3‑1/2" socket head cap screw is manufactured from premium high‑strength alloy steel to provide superior fastening performance in heavy machinery, structural steel assemblies, equipment fabrication, and extreme‑duty industrial environments. The thermal black oxide finish increases corrosion resistance, enhances lubricity, and delivers a smooth, uniform, low‑glare appearance while maintaining tight dimensional accuracy.Designed with a heavy‑duty hex socket drive for secure torque transfer and a stable, vibration‑resistant fit, this extra‑long fastener is ideal for high‑load installations requiring maximum strength, precise alignment, and long‑term durability. Its American‑made construction ensures clean, consistent threading, exceptional mechanical integrity, and dependable performance under the harshest operating conditions.