With high helix (45°), right hand spiral flutes, designed to pull swarf towards the shank of the tap. Most suitable for blind-hole tapping. Manufactured to BS 949 : Part 4 : 1990 and ISO 529 : 1975. Tolerance 6H.
Bright finish: standard finish for tapping most materials including low silicon aluminiums, brass, mild steels (low volume) stainless, copper.