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）
IR404534 40 45 34 0.088 IR inner circle
IR404540 40 45 40 0.105 IR inner circle
IR404540.5 40 45 40.5 0.104 IR inner circle
IR404822 40 48 22 0.093 IR inner circle
IR405020 40 50 20 0.106 IR inner circle
IRZ404823 40 48 23 0.095 IR inner circle
IR404830 40 48 30 0.123 IR inner circle
IR404840 40 48 40 0.165 IR inner circle
IRZ404841 40 48 41 0.17 IR inner circle
IR424720 42 47 20 0.054 IR inner circle
IR424730 42 47 30 0.081 IR inner circle
IR455020 45 50 20 0.058 IR inner circle
IR455025 45 50 25 0.071 IR inner circle
IR455025.5 45 50 25.5 0.073 IR inner circle
IR455030.5 45 50 30.5 0.0875 IR inner circle
IR455035 45 50 35 0.095 IR inner circle
IR455040 45 50 40 0.115 IR inner circle
IR455222 45 52 22 0.088 IR inner circle
IRZ455223 45 52 23 0.093 IR inner circle
IR455230 45 52 30 0.123 IR inner circle