... 6000, 6200, 6300, 6800 and 6900 series.Deep groove,or single row radial,ball bearings are the most widely used ... Zirconia ZrO2) and Silicon Nitride Si3N4 · Closures: Rubber, Thin Seals or Metal Shields · Retainers: Steel,Nylon,Polyimide,Phenolic,Peek, Bakelite, GFRPA66-25, ... PI,AISI,US304, SUS316,Cu or Bronze · Payment: L/C, ...