NJ209 - ECJ is a single - row cylindrical roller bearing with a bore diameter of 45mm, an outer diameter of 85mm, and a width of 19mm. It features an optimized internal design (EC) with an increased number of rollers and optimized roller dimensions, and is equipped with a pressed - steel cage (J). Made of high - carbon chromium bearing steel, it has a double - flanged outer ring and a single - flanged inner ring structure. It can withstand radial and single - direction axial loads, with a maximum speed of 9500r/min under oil lubrication, and is suitable for a shaft diameter of φ45k6.