Description
Spiral flute tap with chamfer form C with a 2-3xP plug lead, for Unified National Coarse thread UNC 1/4″ with 20 TPI and 2B class of fit, dimensions according to ISO 529 standard with 6.3mm shank and 5.0mm 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
