I used this bearing to replace a bushing that kept wearing out inside of a gear on my metal lathe. I cut out the inside of the gear to match the outside diameter of the bearing and put two bearings in the gear and put the gear back on the shaft. The shaft is about .002 smaller than the bearing so it rolles easy. So far it has held up great. The only lubrication it gets is a squirt of oil before I turn on the lathe.