6204UU Sealed Ball Bearing, the 6204UU inner diameter is 20mm, 6204UU outer diameter is 47mm and the 6204UU width is 14mm, 6204UU is a popular size that could be used in many applications, 6204UU Bearing is made of Chrome Steel,6204UU bearing has 2 Blue Rubber Seals to protect the bearing from dust or any possible contamination, 6204UU bearing is pre-lubricated with grease.