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Spiral flute tap with chamfer form C with a 2-3xP plug lead, for Unified National Coarse thread UNC 3/8" with 16 TPI and 2B class of fit, dimensions according to ISO 529 standard with 10.0mm shank and 8.0mm square drive, powder metallurgical HSS-E with steam tempered surface finish and 45° helix angle for 2.5xD blind hole threading in general purpose applications