Description
Spiral point tap with chamfer form B with a 3.5-5xP second lead, for British Standard Whitworth thread BSW 1/2″ with 12 TPI and Medium class of fit, dimensions according to ISO 529 standard with 9.0mm shank and 7.1mm square drive, HSS with steam tempered surface finish for 2.5xD through hole threading in alloy steel
