Im looking for info/advice on hard threading. I have some parts that I'm going to have to hard thread out of powder metal, they will be around 50RC. the thread size is 3/8-24. Threading before hardening is not and option as we were given a written set of instructions on how to make the parts (they are for test samples). They will be done on an Okuma Genos L400 and are about 3 inches long when completed, threaded area is abou 5/8 long. Thanks