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I buy some with 1/4 NPT at Tractor Supply Co. stores or other farm supply stores in aisle where they have all the air compressor attachments and brass adapters. The ones I get are from a company called Tru-flate. I use them to build test guage setups for rough-ins.
The ones for truck tires have to be sandwiched into a piece of metal, like a tire rim, and aren't threaded like you are asking for.