UC204-12 3/4 Axle Bearing Insert Mounted BearingsUC204 12 Mounted Bearing 3 4" x 47mm x 31mm 3 4" mounted Bearing UC204 12, the inner diameter is 3 4", the outer diameter is 47mm, the inner ring width is 31mm and the outer ring width is 16mm. Item: UC204 12 Bearing Type: Mounted Bearing Bearing Size: 3 4" x 47mm x 16mm 31mm Bearing Inner Diameter: 3 4" inch Bearing Outer Diameter: 47mm Bearing Inner Ring Width: 31mm Bearing Outer Ring Width: 16mm Dynamic load rating Cr: 12. 8 KN Static load rating