Mar 10, 2023 · Typically the main factor is what shank size bits are you going to run, if you want to use 1/2" shank bits you need the 2.2kw ER20 spindle ...
Jun 22, 2023 · An ER20A nut is 25mm x 1.5 with the hex. A ER20 compact is 24mm X 1.0. This one has groves in it istead of the hex. The original Langmuir nuts ...