Item: Radial Ball Bearing, Bearing Type: Double Shield, Bore Dia.: 12 mm, Bore Tolerance: +0/-0.008 mm, Outside Dia.: 28 mm, Outside Dia. Tolerance: +0/-0.009 mm, Width: 8 mm, ABEC Tolerance: 1, Dynamic Load Capacity: 1,150 lb., Static Load Capacity: 540 lb., Max. RPM: 30,000, Temp. Range: -40 Degrees to 350 Degrees F., Bearing Material: 52100 Chrome Steel, Cage Material: Pressed Steel, Shield Material: Pressed Steel, Lubrication: Polyrex EM Grease Industry Number: 6001-ZZ C3