Hello, I am getting serious about being a home mechanic. I already have a few metric round-adjustable Greenfield dies that I have used to "extend" the treading into the blank sections on some longer bolts (M6, M8, M10 and M12). A friend of mine stated stated that you should not use the round "threading" dies for retreading work since they simply shave away the deformed metal rather than coaxing the threads back into shape like hexagonal dies would. Is this correct? So should I also purchase some of the Hex shaped "rethreading" dies if I already own the circular versions?
- posted
14 years ago