Re: Plumbing pitch puzzle

BP wrote in message news:vudlmn$1s7rl$1@dont-email.me... Leon Fisk <lfiskgr@gmail.invalid> wrote:

On Wed, 23 Apr 2025 23:57:40 -0000 (UTC)
bp@www.zefox.net wrote:
 <snip"

Perhaps the oddest thing is the rounded thread profile, almost
like a Whitworth pattern.

 Wiki has a page for:
 "Knuckle threads or round threads are an unusual highly rounded
thread form. The large space between the rounded crests and roots
provides space for debris to be shifted to not interfere with the
thread, making this form resistant to debris and thread damage."
 https://en.wikipedia.org/wiki/Knuckle_thread
 With a high tolerance for debris in the threads their use in this paint
application would make a lot of sense...

I think that's probably it. German standard, too 8-)
Looks like there's a "Wagner Tooling Systems" company too, though I can't
discern any direct connection to Wagner painting equipment. Unfortunately, I don't find any source of small fittings based on the
thread. McMaster-Carr sells leadscrews and nuts, but that's it. Thanks for writing!
bob prohaska
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https://www.isbt.com/resources/isbt-threadspecs