NK-M series

The NK-M series is a single row solid ring needle roller bearing without an inner ring and with a cage. M is the suffix mark of the outer ring with lubrication groove and lubrication hole. The outer ring has a dual gear edge and a needle roller cage assembly, forming a complete unit without an inner ring. The radial space is extremely compact, and it can adapt to medium and low-speed industrial scenarios that require quenching and grinding raceways and convenient grease filling. It is widely used for radial support in motors, pumps and valves, automotive transmissions, textile machinery, and automation 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）
NA4905M 25 42 17 21.8 28.2 0.0925 NK-M series
RNA493M 5 11 10 2.42 1.95 0.0046 NK-M series
RNA494M 6 12 10 2.7 2.32 0.0053 NK-M series
RNA495M 7 13 10 2.7 2.4 0.0059 NK-M series
RNA496M 8 15 10 3.5 3.1 0.0073 NK-M series
RNA497M 9 17 10 4.1 3.3 0.0093 NK-M series
RNA498M 10 19 11 5.7 4.6 0.0126 NK-M series
RNA499M 12 20 11 6 5.7 0.0136 NK-M series
RNA4900M 14 22 13 8.4 9.2 0.0165 NK-M series
RNA4901M 16 24 13 8.9 10.2 0.0181 NK-M series
RNA4902M 20 28 13 10 12.6 0.0215 NK-M series
RNA4903M 22 30 13 10.8 14.3 0.0235 NK-M series
RNA4904M 25 37 17 19.3 23 0.0555 NK-M series
RNA4905M 30 42 17 21.8 28.2 0.064 NK-M series
NA495M 5 13 10 2.7 2.4 0.0073 NK-M series
NA496M 6 15 10 3.5 3.1 0.0091 NK-M series
NA497M 7 17 10 4.1 3.3 0.0112 NK-M series
NA498M 8 19 11 5.7 4.6 0.015 NK-M series
NA499M 9 20 11 6 5.7 0.0167 NK-M series
NA4900M 10 22 13 8.4 9.2 0.024 NK-M series