6311-ZZ SKF Shielded Radial Ball Bearing (0324)Item: Radial Ball Bearing, Bearing Type: Double Shield, Bore Dia.: 55 mm, Bore Tolerance: +0 0. 015 mm, Outside Dia.: 120 mm, Outside Dia. Tolerance: +0 0. 015 mm, Width: 29 mm, ABEC Tolerance: 1, Dynamic Load Capacity: 16,100 lb., Static Load Capacity: 10,100 lb., Max. RPM: 6,800, Temp. Range: 40 Degrees to 350 Degrees F., Bearing Material: 52100 Chrome Steel, Cage Material: Pressed Steel, Shield Material: Steel, Lubrication: Polyrex EM Grease,