Description
Straight flute hand tap NO1 with a 6-8xP taper lead, for British Standard Whitworth thread BSW 1/4″ with 20 TPI and Medium class of fit, dimensions according to ISO 529 standard with 6.3mm shank and 5.0mm 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.
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