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+1 (217) 579-8045Straight flute tap with a 2-3xP semi-bottoming lead, for (Dryseal) National Pipe Taper thread for Fuel lines NPTF 3/4" with 14 TPI and Normal class of fit, dimensions according to ANSI standard with 0.9060" shank and 0.6790" square drive, HSS with TiN coating for 1.5xD through or blind hole threading in alloy steel.