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Difference between EX20 and ER20 collets if any

viper

Titanium
Joined
May 18, 2007
Location
nowhereville
I have some used collet chucks here. One of them the nut says EX20, three others say UM/ER20. I cannot really see a difference in the collets but I did not get out the caliper either. Are these two interchangable?
 
Got me some DIN (CAT40) tool holders in the shop too. Soon I will have to change my name to Eurowheat or Italian sunflower. K, I will stop the gayness there.
 








 
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