Set Screws Socket Knurled Cup Point Alloy Thermal Black Oxide 4-40 X 3/8 is a precision fastener designed for secure, vibration-resistant connections in metalworking, machinery, and equipment.

These socket-set screws feature a socket drive for easy tool access, a knurled cup point to maximize grip on mating surfaces, and an alloy steel core finished with a durable thermal black oxide. The combination delivers reliable retention and resistance to loosening under load and vibration.

• Thread size: 4-40
• Length: 3/8 in
• Point type: Knurled Cup
• Drive type: Socket (internal hex)
• Material: Alloy steel
• Finish: Thermal Black Oxide

Ideal for securing pulleys, gears, collars, and other components in small assemblies, electronics enclosures, and precision fixtures. The knurled cup point provides commanding grip, while the thermal black oxide finish offers added wear resistance and a low-glare appearance. Use with an appropriate Allen wrench to install or remove, and avoid over-tightening to maintain optimal grip over time.

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.