Straight flute tap with a 2-3xP semi-bottoming lead, for National Pipe Taper thread NPT 1/2" with 14 TPI and Normal class of fit, dimensions according to ~ANSI B94.9 standard with 0.6880" shank and 0.5150" square drive, HSS with bright finish for 1.5xD through or blind hole threading in free machining and plain carbon steel and copper or copper alloys.