Description
Spiral point tap with chamfer form B with a 3.5-5xP second lead, for Unified National Fine thread UNF 1/2″ with 20 TPI and 2B class of fit, dimensions according to ISO 529 standard with 9.0mm shank and 7.1mm square drive, powder metallurgical HSS-E with steam tempered surface finish for 2.5xD through hole threading in general purpose applications


