#8-32 x 3/8" 18-8 Stainless Steel Coarse Thread Hex Socket Headless Set Screws 20PK, Midwest Fastener, Mfr#: 67567

A set screw is a type of screw generally used to secure an object within or against another object, normally not using a nut. The most common examples are securing a pulley or gear to a shaft.