Description
Combination drill-tap with a 27° spiral flute, for National Pipe Taper thread NPT 1/4″ with 18 TPI and Normal class of fit, dimensions according to ANSI standard with 0.5620″ shank and 0.5620″ square drive, HSS with bright finish and 27° helix angle for 1.5xD through or blind hole threading in free machining steel
