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）
NKI22/20 22 34 20 20.6 33.7 0.064 NK series
NKI25/20 25 38 20 21.6 37.2 0.079 NK series
NKI25/30 25 38 30 30.9 59 0.123 NK series
NKI28/20 28 42 20 25.7 42.2 0.096 NK series
NKI28/30 28 42 30 36.9 67.1 0.146 NK series
NKI30/20 30 45 20 27 46.2 0.112 NK series
NKI30/30 30 45 30 38.6 73.5 0.171 NK series
NKI32/20 32 47 20 28.2 50.1 0.117 NK series
NKI32/30 32 47 30 40.5 79.8 0.17 NK series
NKI35/20 35 50 20 29.4 54.1 0.13 NK series
NKI35/30 35 50 30 42.3 86.1 0.193 NK series
NKI38/20 38 53 20 30.5 58.1 0.134 NK series
NKI38/30 38 53 30 43.7 92.5 0.207 NK series
NKI40/20 40 55 20 31.1 60.1 0.143 NK series
NKI40/30 40 55 30 44.5 95.7 0.216 NK series
NKI42/20 42 57 20 31.5 62.3 0.148 NK series
NKI42/30 42 57 30 45.2 99 0.222 NK series
NKI45/25 45 62 25 43 85.2 0.229 NK series
NKI45/35 45 62 35 58.1 125.5 0.322 NK series
NKI50/25 50 68 25 45.4 94.1 0.271 NK series