5/16"-18 x 2-1/2 in Slotted Hex Machine Screw, Plain Nylon, 8 PK Machine screws are used in fastening nearly all types of hard materials.. Especially useful in metal-to-metal or where heavy duty fastening is required.
M6-1.00 Socket Head Cap Screw, Steel, 20 mm Length, 12 PK Socket screws are commonly used in assemblies that do not provide sufficient clearance for a conventional wrench or socket. A socket cap screw is a type of cap screw with a hexagonal recessed drive.