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+1 (217) 579-8045Straight flute tap NO2 with a 4-6xP plug lead, for Unified National Coarse thread UNC 7/8" with 9 TPI and 3B class of fit with H4 pitch diameter limits, dimensions according to ANSI standard with 0.6970" shank and 0.5230" square drive, HSS with TiN coating for 1.5xD through or blind hole threading in general purpose applications.