NK series

The NK series is a single row light series needle roller bearing without an inner ring and a dual gear edge solid ring. The core unit is composed of a dual gear edge solid outer ring and a needle roller holder assembly. The design without an inner ring makes the radial section extremely compact. It relies on a quenched and finely ground journal as the inner raceway and only bears pure radial loads. It is suitable for general industrial scenarios with medium low speed, medium heavy load, and limited radial installation space. It is a mainstream radial support accessory for motors, transmissions, automation equipment, light industrial machinery, etc.

Model Basic Dimensions Basic rated dynamic load Weight Type
Inner diameter Outer diameter Thickness Dynamic load Static load
[mm] [mm] [mm] (kN) (kN) （kg）
NK28/30 28 37 30 31.1 58.9 0.0835 NK series
NK29/20 29 38 20 21.6 37.2 0.057 NK series
NK29/30 29 38 30 30.9 59 0.085 NK series
NK30/20 30 40 20 25.1 40.1 0.0645 NK series
NK30/30 30 40 30 36 63.8 0.0975 NK series
NK32/20 32 42 20 25.7 42.2 0.068 NK series
NK32/30 32 42 30 36.9 67.1 0.102 NK series
NK35/20 35 45 20 27 46.2 0.0735 NK series
NK35/30 35 45 30 38.6 73.5 0.112 NK series
NK37/20 37 47 20 28.2 50.1 0.0775 NK series
NK37/30 37 47 30 40.5 79.8 0.117 NK series
NK38/20 38 48 20 28.1 50.2 0.079 NK series
NK38/30 38 48 30 40.3 80 0.119 NK series
NK40/20 40 50 20 29.4 54.1 0.083 NK series
NK40/30 40 50 30 42.3 86.1 0.125 NK series
NK42/20 42 52 20 29.9 56.2 0.0865 NK series
NK42/30 42 52 30 43 89.5 0.13 NK series
NK43/20 43 53 20 30.5 58.1 0.0885 NK series
NK43/30 43 53 30 43.7 92.5 0.133 NK series
NK45/20 45 55 20 31.1 60.1 0.092 NK series