Here is a job I had to tackle recently at work. It is a replacement valve stem for an outdoor faucet. The material is brass and it needed a double start stub acme thread. The stub acme has a couple of different variations. One has a 60 degree thread angle with a wide flat, and then this style, which I believe is more common. It has the same 29.5 degree angle as a regular acme, but is only about half as deep.
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