4mm-0.7 x 20mm Black Oxide Knurled Hex Socket Cap Screws (10 pcs.)

Diameter: 4mm Length: 20mm Material: Steel Finish: Black Oxide Head Style: Knurled Socket (Hex) Thread Size: 0.7mm (Coarse) Thread Length: Full Hardness: Class 12.9 Type: Socket Cap Screw Specifications: DIN 912 Box of 10. A socket cap screw is a type of cap screw with a hexagonal recessed drive. A hex key is required to tighten or loosen a socket screw. Socket screws are commonly used in assemblies that do not provide sufficient clearance for a conventional wrench or socket.