E5701/4X40NO3 HSS Straight Flute Hand Tap, UN, ISO Standard

Straight flute hand tap NO3 with a 2-3xP plug lead, for Unified National thread UN 1/4" with 40 TPI and 2B 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