Source for supplies

jlindustrial.com

Jerry, Not referring to those taps&dies specifically, but you need to know about these three stores

================================= Unless you are fitting the project to something else [like your lathe] you chould consider "translating" the threads standard for your area. Consider a 1/8X27 NPT in place of the 1/8X32 BSPT and a 3/4 X 18 (3/4 UNF) in place of the 20X1 mm.

Your choice of taps will be wider and the prices lower.

=================== Quite right 1/8X28 not1/8X32 BSPT

I was not meaning to necessarly thread the parts on the lathe, as much as buy standard US taps/dies.

I used the lathe only as an example of a pre-existing piece of equipment that the project had to fit.

By using standard 1/8 NPT threads you would most likely be able to get your pipe cut to length and threaded at the better hardware or plumbing supply, and use standard valves/fittings.

M20X1 nuts, bolts, all-thread rod, and studs are a little more available in the US, but 3/4UNF components, taps, dies, etc. are much more common and therefore cheaper with a bigger selection.

If you are locked in to the BSPT and metric threads see

A google search shows many other sources.

I'm in the UK so metric or BSP makes little difference price wise, give it another few decades and I expect the metric will be cheaper. BSP and NPT differ by a small amount on TPI except for a couple around 1/2" and the thread angle, not too important for most applications. I'm not sure what use the M20x 1 has anywhere but I do have M16x1.5, M20x1.5, and M25x1.5, which are conduit threading dies I have with a rotostock kit.

A good idea to use npt, but the application has metric and bspt used on it and I can't change that. Wish that I could.

Thanks. Jerry