5/16"-18 x 1-1/4" Steel Coarse Thread Hex Socket Headless Set Screws

Diameter: 5/16"
Length: 1-1/4"
Material: Steel
Head Style: Headless (Hex)
Thread Size: 18 (Coarse)
Thread Length: Full
Style: Socket
Type: Set Screw

Box of 8.

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.