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）
IR354020.5 35 40 20.5 0.0465 IR inner circle
IR354025.5 35 40 25.5 0.046 IR inner circle
IR354030 35 40 30 0.067 IR inner circle
IR354034 35 40 34 0.078 IR inner circle
IR354040 35 40 40 0.095 IR inner circle
IR354220 35 42 20 0.065 IR inner circle
IRZ354221 35 42 21 0.067 IR inner circle
IRZ354223 35 42 23 0.074 IR inner circle
IR354227 35 42 27 0.08 IR inner circle
IR354236 35 42 36 0.12 IR inner circle
IRZ354237 35 42 37 0.12 IR inner circle
IR354322 35 43 22 0.081 IR inner circle
IR384320 38 43 20 0.0495 IR inner circle
IR384330 38 43 30 0.072 IR inner circle
IR404517 40 45 17 0.0445 IR inner circle
IR404520 40 45 20 0.051 IR inner circle
IR404520.5 40 45 20.5 0.0525 IR inner circle
IR404525.5 40 45 25.5 0.0655 IR inner circle
IR404530 40 45 30 0.077 IR inner circle
IR404530.5 40 45 30.5 0.0785 IR inner circle