An externally threaded fastener with unified threads, a cylindrical head with a flat chamfered top surface, knurled cylindrical sides and hexagonal recess. It is made from austenitic stainless steel. Jet Fitting and Supply Corporation has been working with Socket Head Cap Screws - Allen Screw - Capscrews - Socket Cap Screws - since 1946. Socket Cap Screws have a cylindrical head. Allen (hex socket) is the primary drive used and is to be torqued using an allen wrench, also called a hex key. We provide high quality Socket Head Cap Screws, Metric Allen Bolts, Imperial Cap Screws in an assortment of material including Alloy Steel, Stainless Steel 18-8, Stainless Steel 316, Brass, Silicon Bronze, Metric Grades 4.8, 8.8, 10.9,and 12.9. All Socket Cap Screws are manufactured with Strict Adhereance to all Specifications as dictated by the Industrial Engineering standards. We offer various head styles: cylindical, button head, low head, flat head 90 degrees, 100 degree flat heads, Button Flanged, Pan Head, Pan Head Flanged. We have one of the largest assortments of Socket Head Cap Screws to be found anywhere.