1/2-13 X 2 1/2 SHCS 18-8
An externally threaded fastener with unified threads, a cylindrical head with a flat chamfered top surface, knurled cylindrical sides, and hexagonal recess, made from stainless steel.
Although stainless socket cap screws have significantly less tensile and yield strength than alloy sockets, they have superior corrosion resistance. They retain their mechanical and performance capabilities at higher than ambient temperatures.
Rockwell B80 minimum.