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Help identify collet holder

Corn

Aluminum
Joined
Nov 3, 2019
Hi,

This is starting to be embarrassing. This holder came with the mill and I’d need 20mm collet for this. However I have two failed attempts to order correct collet. First I thought it is ER32 but the taper angle is smaller. ER32 collet was about ok on top but at the bottom loose. So I googled and found out OZ collets. Assumed OZ32 would be it and had that ordered. Well in all wisdom OZ32 is around 44mm and not 32 that one could assume. At this point I’m pretty pissed and turn to you, how can I make sure that what collet is correct for this? Now I’m pretty sure that it is OZ25 but is it? I don’t have any shop close to me who has wide selection of collets to bring it there to test so I’m relying on ordering. I don’t want to screw up third time.

Your help is greatly appreciated.
 

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