Description
Straight flute hand tap NO1 with a 6-8xP taper lead, for Unified National Fine thread UNF 12 with 28 TPI and 2B class of fit, dimensions according to ISO 529 standard with 5.6mm shank and 4.5mm square drive, HSS with bright finish for 1.5xD through or blind hole threading in free machining and plain carbon steel and copper or copper alloys
