Posted by:
Mike L Clark (---.range86-162.btcentralplus.com)
Tracy Tools - first port of call for any threading kit.
[
www.tracytools.com]
Peter here is the size you want, towards the bottom of the page.
For soft metal like brass, or for just one or two threads in mild steel, carbon steel taps are OK and cheap, but long term, or for stronger steel like En8 or En 16, buy HSS taps and dies.
Mike