Upgrade your fixtures with the Set Screws Socket Knurled Cup Point Alloy Thermal Black Oxide 4-40 X 5/16. Engineered for durability and precision, this socket set screw features a knurled cup point that provides excellent grip and anti-slip performance even in vibration-rich environments. The alloy steel construction delivers high strength, while the thermal black oxide finish adds corrosion resistance and a matte, low-reflectivity surface ideal for precision assemblies.

Key Features

• Drive Type: Socket (internal hex) for secure driving in tight spaces
• Point: Knurled Cup Point for positive engagement and vibration resistance
• Material: Alloy Steel for superior strength
• Finish: Thermal Black Oxide for wear resistance and reduced glare
• Thread Size: 4-40
• Length: 5/16 inches

Why it matters

This set screw is ideal for locking components without damaging surfaces. The knurled cup point helps distribute pressure evenly, reducing marring on delicate parts while maintaining clamping force over time. The 4-40 threading makes it compatible with a wide range of standard kits and chassis mounts.

Applications

Use in machinery, fixtures, electronics, and manufacturing jigs where precise, secure, and reusable fasteners are required.

Quality you can rely on — engineered for repeatable performance in industrial environments, with consistent metallurgy and coating to maintain torque and grip over many cycles.

WARNING: This product can expose you to chemicals including lead and lead compounds, which are known to the State ofCalifornia to cause cancer and birth defects or other reproductive harm. For more information go tohttps://www.P65Warnings.ca.gov.