Coarse thread 3/4 – 10 TPI (Threads Per Inch) flat head socket cap screw – stainless steel Flat head socket cap screws are usually countersunk into the material so that the screw head is flush to or below the surface of the material. Have a tapered countersink beneath head and a blunt tip 3/4-10 X 2″ FLAT HEAD SOCKET CAP SCREW