Shoulder bolts ; Allen. Allen (hex socket) drive is a six-sided recess for use with an allen wrench (hex key). Stainless steel 18-8. heremon stainless steel for general hardware use. Shoulder screws have a cylindrical shoulder under the head that allows parts to rotate around or slide along its length. They have a standard shoulder with an … A shoulder screw has a smooth shank top, or shoulder , with a narrower, threaded tip at the bottom. These screws are often used in engines and mechanical applications to allow for rotation of pulleys, linkages and other moving parts.
Shoulder screws , also known as shoulder bolts and stripper bolts , are machine screws with an integral shoulder or journal between the head and thread.