I have ordered a new spindle for my Bonelle tool grinding machine. It is an ER 16 collet chuck spindle with an outer diameter of 25 mm and a length of 150 mm. It has a clear advantage over the spindle with ER 25 collet holder. You can pull the spindle out of its holder without removing the dividing plate. The clamping nut only has an outer diameter of 22.2 mm.
