Item: Radial Ball Bearing, Bearing Type: Double Shield, Bore Dia.: 20 mm, Bore Tolerance: +0/-0.01 mm, Outside Dia.: 42 mm, Outside Dia. Tolerance: +0/-0.01 mm, Width: 12 mm, ABEC Tolerance: 1, Dynamic Load Capacity: 2,110 lb., Static Load Capacity: 1,140 lb., Max. RPM: 21,000, Temp. Range: -40 Degrees to 350 Degrees F.,  Bearing Material: 52100 Chrome Steel, Cage Material: Pressed Steel, Shield Material: Steel ,Lubrication: Polyrex EM Grease, Industry Number: 6004-ZZ C3