We are thread rolling an alum extrusion 2-56 (kinda gummy characteristics) 6063 maybe not real sure.

Question 1: Does any one have any info on how the threads are supposed to look?

The recomended size is .078-.080. we went with .0765 roughly. the threads still look like they have 2 crests, top and bottom.


Question 2: Is this typical for thread roller taps?



Any info on this matter would be greatly appreciated. nfs