This is a genuine Powermatic replacement part. The lock nut is designed by the manufacturer for use in a variety of saws and power tools such as planers and hoists. This part is made of metal, and may be found in various locations in the machine, depending on model. Please be aware that there are different nuts used in the machine. Re...Read morefer to the parts diagram to be sure of ordering the correct part. You will require a wrench when replacing this item. This part is sold individually.