I am new to metalworking and I just bought a small lathe. One of the projects I am going to work on requires a 20x1 metric thread and a 1/8-28 bspt thread. Can someone direct me to a decent source to purchase these dies and taps in the U.S.?
================================= 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.
1/8-28 >>bspt thread. Can someone direct me to a decent source to purchase these dies >>and taps in the U.S.? >>
1/8" BSPT is 28 TPI not 32. Whether it can be converted depends on the end application but the lathe itself may be able to do these threads, the M20 x 1 at least if parallel, the BSP taper thread would be more difficult
=================== 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
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.
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