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）
NA4901M 12 24 13 8.9 10.2 0.0265 NK-M series
NA4902M 15 28 13 10 12.6 0.035 NK-M series
NA4903M 17 30 13 10.8 14.3 0.039 NK-M series
NA4904M 20 37 17 19.3 23 0.0785 NK-M series
NA4905M 25 42 17 21.8 28.2 0.0925 NK-M series