Inner Diameter: 20mm / 0.79 inch, Outer Diameter: 47mm / 1.85 inch, Thickness: 14mm / 0.55 inch.. hese bearings are made of bearing steel and Rubber for easy using,low noise and long service life.. They are double shielded to avoid dust, trash and so on entering and save lubricant.. If the outer ring rotates there is a danger that grease may be lost from the bearing at high speed.. This type of bearing is widely applied in low-speed transmission equipment, hardware equipment, industrial machine, motorcycle, automobile,and other kinds of field..
