Sorry it's not for a Norton but I thought I might get some help over here.
Looking for a tap and die set, I am wondering what to order. Diameter looks close to 1/2", in fact 12,5mm, and the beginning of the thread looks like 24tpi. But it isn't. Have a look at the photos.
What do you think?
Norton tank threads (and…
Norton tank threads (and often others) are 1/4" BSP. Which is 19tpi. Google dimensions. The OD is just over 1/2".
Pipe thread nominal size (1/4") refers to the internal size of pipe. It's still in common use today. Thankfully (or house maintenance would be ever more complicated).
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And straight pipe....1/4" BSPP......
.....not tapered, BSPT.
https://www.ryco.com.au/technical/thread-connector-guides/bspt-bspp-threads/
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Looks just like the thread…
Looks just like the thread on the Norton tap, as above 1/4 BSP . Most confusing to many as it measures so much bigger than that. I have a whole range of BSP taps, where are you based ?.
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Great thank you, I'm in…
Great thank you, I'm in France, close to Chamonix. Luckily Royal Mail is doing good.
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It might be BSB (British Standard Brass) 1/2" o/d, 26 tpi.
If it is for something British.