Baldor 7312B rebuild, dual speed/dual HP grinder. I have finished rebuilding a Baldor 7312B, 0.5/0.3 HP, 3600/1800 RPM grinder. Before. On OWWM, I posted this question. << I have a bearing question. It has has 6203 Z NTN bearings. Jennifer Modica from Accurate Bearing, quoted 6203 ZZ NACHI replacements (great price, BTW).