The alloy steel socket cap screw has a plain finish and a button head with an internal hex drive, and meets American Society of Mechanical Engineers ASME B18.3 and American Society for Testing and Materials ASTM F835 specifications. Alloy steel is often used in applications where strength is the primary consideration. The button head is round with a low profile and short vertical sides, and is suitable for light duty applications. The internal hex drive, also known as a hex-socket drive, has a hexagonal slot that requires an Allen key driver, also known as a hex key or Allen wrench.Socket cap screws are threaded fasteners that have a cap head with an internal socket drive for installing in areas with limited side clearance. These screws are available with a variety of head shapes, which determine how the screw interacts with the mating surface, and drive styles, which determine the type of tool required to install the screw. Alloy steel is often used in applications where strength is the primary consideration Plain surface has no finish or coating Button head has a rounded, low-profile top that is suitable for light duty applications Internal hex drive has a hexagonal slot that turns using an Allen key driver Meets ASME B18.3 and ASTM F835 specifications UPC 082893410906 Brand Small Parts Model 201002 Head Type Button Size Name #0-80 Metal Type Alloy Steel Unit Count 100.0 Count Part Number B000FMWAHO Thread Size #0-80 Thread Type Unf Drive System External Hex Manufacturer Small Parts Thread Style Right Hand Fastener Size #0-80 Fastener Type Machine Screw Material Type Alloy Steel Exterior Finish Plain Item Dimensions 0.19 inches Thread Coverage Fully Threaded Screw Head Style Button