IR inner circle

The IR series is a standard inner ring for needle roller bearings, without rollers or retainers. It is only used for high-precision grinding of the raceway inner ring and is suitable for use with various types of needle roller bearings without inner rings. It compensates for the problem of insufficient hardness/accuracy of the shaft neck, improves the overall bearing capacity and service life of the bearing, and can be press fit on the shaft neck for use. It is suitable for radial support scenarios of general industrial equipment.

Model Basic Dimensions Basic rated dynamic load Weight Type
Inner diameter Outer diameter Thickness Dynamic load Static load
[mm] [mm] [mm] (kN) (kN) （kg）
IR455240 45 52 40 0.165 IR inner circle
IRZ455241 45 52 41 0.17 IR inner circle
IR455520 45 55 20 0.12 IR inner circle
IR455522 45 55 22 0.13 IR inner circle
IR455540 45 55 40 0.245 IR inner circle
IR505520 50 55 20 0.063 IR inner circle
IR505525 50 55 25 0.077 IR inner circle
IR505535 50 55 35 0.11 IR inner circle
IR505540 50 55 40 0.13 IR inner circle
IR505822 50 58 22 0.116 IR inner circle
IRZ505823 50 58 23 0.118 IR inner circle
IR505830 50 58 30 0.159 IR inner circle
IR505840 50 58 40 0.21 IR inner circle
IRZ505841 50 58 41 0.215 IR inner circle
IR506020 50 60 20 0.135 IR inner circle
IR506025 50 60 25 0.163 IR inner circle
IR506040 50 60 40 0.265 IR inner circle
IR556025 55 60 25 0.088 IR inner circle
IR556035 55 60 35 0.12 IR inner circle
IR556325 55 63 25 0.145 IR inner circle