Help Identifying Vintage Faucet Seat

[tehward]

Found this forum today and you all look like a lively knowledgeable bunch and maybe you can help me identify this without too much effort!

I have an old UNITED Brass tub faucet set from I'm guessing the 30-40's(?). Well, the seats are shot and I'm looking for replacements. I checked all the big-box stores and cannot find a match.

I've used a caliper to get the rough measurements below.
Outside diameter: 0.666
Thread diameter: 0.551
Threads and spacing: 4 @ 0.025
Depth: 0.416
I’m thinking it’s a 3/8-24…as it will thread into a 3/8 female compression style fitting?

 

[Reach4]

I've used a caliper to get the rough measurements below.
Outside diameter: 0.666
Thread diameter: 0.551
Threads and spacing: 4 @ 0.025
Depth: 0.416
I’m thinking it’s a 3/8-24…as it will thread into a 3/8 female compression style fitting?

That would make the thread 9/16-24
http://www.efunda.com/designstandards/screws/unified.cfm?start=64&finish=147

https://hdsupplysolutions.com/shop/...dard-seats-9-16-24-x-3-8-h-2-per-card-p514848

Do a search for " 9/16-24" seat in a search engine.

 

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[tehward]

Thanks for the info...it's all making more sense now.