Spherical Roller Bearings 1. Bore diameter 50mm to out ring diameter 3000mm 2. GCr15,GCr15SiMn,G20Cr2Ni4A 3. precision level:P0,P5,P6 Bearing Number(1): 21308, 21308K, 21308KW33C3, 21308W33C3, 21309, 21309K, 21309KW33C3, 21309W33C3, 21310, 21310K, 21310KW33C3, 21310W33C3, 21311, 21311K, 21311KW33C3, 21311W33C3, 21312, 21312K, 21312KW33C3, 21312W33C3, 21313, 21313K, 21313KW33C3, 21313W33C3,