Quote Originally Posted by routercnc View Post
Does anyone know if thread milling would work in 303 ?

Does it need multiple passes therefore may work harden?

At least if the tap broke the work is recoverable
yes thread milling will work in 303. if I had to thread mill them with the small sizes of thread I would do them in one cut with a micro thread mill. personally though I would roll tap the threads as it will create no swarf to get stuck in the tap and 303 forms very well