For Samsung Washing clothes machine WA50F9A7DSP/A2
The large (about 1 inch) nut at the bottom of the tub that holds the tub onto the clutch/motor is NOT Appliance Parts Pros 6021-001573, described as NUT-HEXAGON M26 OD44 ZNDC1. This nut has a 24 mm internal diameter. It is marked ZNDC-1 MT26 70H on top of the nut and is left hand or reverse thread. It is slightly too small to thread onto the clutch shaft.
THE CORRECT NUT has a 26 mm internal diameter. That is Appliance Parts Pros part number AP4203184 and is described as simply NUT-S. It also lists Cross Reference Information “Part Number DC60-50003A (AP4203184) replaces 2068612, DC60-50003B, PS4205376.” It is marked ZNDC-1 IS-1-2 70H on top of the nut and is also left hand or reverse thread, which is the correct thread for the shaft of the clutch to which it connects.