Description
Spiral point tap with chamfer form B with a 3.5-5xP plug lead, for Unified National Fine thread UNF 1/4″ with 28 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 for 2.5xD through hole threading in general purpose applications.
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