UNF 7/16" Socket Cap Screw High Tensile 12.9 Self Colour DIN912

UNF 7/16" Socket Cap Screw High Tensile 12.9 Self Colour DIN912 UNF 7/16" (20 T.P.I.), Fine Pitch, High Tensile (12.9), Self Colour DIN 912. What is a socket cap screw/ bolt?. A screw is fully threaded and a bolt is partialy threaded.