I just bought an old CNC mill. According to the manual it has a "EX16 spindle taper" and originally included "a 1/8-inch EX16 collet".

EX, not ER.

Does anyone know more about the EX series? The only place I've found selling them is here.

There is some discussion here (specific to Unimat) that sometimes the more common ER16 collet can be used with an EX holder. The doc refers to E, ES, ER, E/ES and E/EX but doesn't mention exactly what EX is. I thought it might all be explained in some DIN document (69871?) but drew a blank.

I ordered a cheap ER16 3/8" collet from China to see if it will fit.

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