1/2-13 X 2 1/2 SLOTTED FLAT CAP SCREW A307 GRADE A

A slotted flat cap screw, also known as a slotted flat head screw, is a type of threaded fastener with a flat head and a single slot (or "slotted") groove on top of the head. This groove is designed to accommodate a flat-blade screwdriver or a similar tool for turning and tightening the screw. The flat head is intended to sit flush with the surface of the material it's being fastened to, creating a smooth finish.