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Straight flute hand tap NO1 with a 6-8xP taper lead, for Unified National Coarse thread UNC 1.3/8" with 6 TPI and 2B class of fit, dimensions according to ISO 529 standard with 25.0mm shank and 20.0mm square drive, HSS with bright finish for 1.5xD through or blind hole threading in free machining steel and copper or copper alloys