I acquired a second hand Jacobs MT2 chuck with my lathe. It's drilled and tapped for a drawbar - not sure if at the factory or by a previous owner, but it looks original. It looks and measures like M6, but an M6 rod goes in a couple of turns and jams. M5 just slides in.
Is there a standard size for these? Imperial screw sizing is a closed book to me but I can't see an obvious imperial size between M5 and M6.
Is there a standard size for these? Imperial screw sizing is a closed book to me but I can't see an obvious imperial size between M5 and M6.