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+1 (217) 579-8045Straight flute tap NO3 with a 2-3xP semi-bottoming lead, for Unified National Coarse thread UNC 1/2" with 13 TPI and 3B class of fit with H3 pitch diameter limits, dimensions according to ANSI standard with 0.3670" shank and 0.2750" square drive, HSS with TiN coating for 1.5xD through or blind hole threading in general purpose applications.