Slide Shoe Bearings For Mills Grendonhouse. Jul 31, 2013 the mill rotor bearings, which are mounted in a steel housing, are two 2 cylindrical roller bearings, nu 316 ecmc3, and one 1 grooved ball bearing, skf 6316 c3.The bearings have failed several times over a period of two 2 years.Before this time, the mill had no recorded bearing failures as confirmed by the cmms.Get price.