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）
IR253016 25 30 16 0.028 IR inner circle
IR253017 25 30 17 0.0285 IR inner circle
IRZ253018 25 30 18 0.0295 IR inner circle
IR253020 25 30 20 0.033 IR inner circle
IR253020.5 25 30 20.5 0.034 IR inner circle
IR253023 25 30 23 0.038 IR inner circle
IR253025.5 25 30 25.5 0.0425 IR inner circle
IR253026 25 30 26 0.0445 IR inner circle
IR253026.5 25 30 26.5 0.044 IR inner circle
IR253030 25 30 30 0.049 IR inner circle
IR253030.5 25 30 30.5 0.0505 IR inner circle
IRZ253031 25 30 31 0.051 IR inner circle
IR253032 25 30 32 0.054 IR inner circle
IR253038.5 25 30 38.5 0.064 IR inner circle
IR283217 28 32 17 0.0245 IR inner circle
IR283220 28 32 20 0.0285 IR inner circle
IR283220.5 28 32 20.5 0.0295 IR inner circle
IR283223 28 32 23 0.034 IR inner circle
IR283230 28 32 30 0.043 IR inner circle
IR283230.5 28 32 30.5 0.044 IR inner circle