The C6 can cut both imperial and metric threads with the standard supplied gears although changing the gears can be a pain if you have to do it too often.
There's no threading gauge supplied as standard on the C6, it's an option. It's fairly easy to thread without one by using the motor reverse.
Changing the speed on the C6 is done by moving the drive belt between pulleys and can be a knuckle skinning nuisance, the C4 with a variable speed DC motor is superior in this respect.
For threading, the lower speed that the C4 is capable of, is an advantage.
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