#4-40 x 3/16" 18-8 Stainless Steel Coarse Thread Hex Socket Headless Set Screws 20PK The most common examples are securing a pulley or gear to a shaft..
Socket screws are commonly used in assemblies that do not provide sufficient clearance for a conventional wrench or socket.5/16"-18 Socket Head Cap Screw, 18-8 Stainless Steel, 1/2 in Length, 10 PK A hex key is required to tighten or loosen a socket screw.
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.70 x 12 mm Phillips Truss Machine Screw, Zinc Plated Steel, 50 PK Commonly used with flat or lockwashers.