... :More than 350 types, including metric and inch deep groove ball bearing, self-aligning bearing, angular contact bearing, plain bearing, and ... Si3N4 ceramic bearings.In the ceramic bearings produce deep ditch ball bearings are the main products, gauge 6000-6008 and 6200 ... ,Si3N41200~1208P 0ZrO2,Si3N4 NSK SKF KOYO Ceramic Deep Groove Ball Bearing6002