Universal K-series needle roller assembly

The universal K series needle roller assembly is a centripetal needle roller unit (commonly known as "chicken cage bearing", complying with JB/T 7918 standard) consisting only of needle rollers and retaining frames without inner/outer rings. It relies on quenched and finely ground shaft necks and bearing seat holes as raceways, with extremely compact radial space and strong load-bearing capacity per unit area. It is suitable for pure radial heavy load and thin design, and is widely used in space sensitive transmission scenarios such as gearboxes, motors, and agricultural machinery.

Model Basic Dimensions Basic rated dynamic load Weight Type
Inner diameter Outer diameter Thickness Dynamic load Static load
[mm] [mm] [mm] (kN) (kN) （kg）
K42X47X17 42 47 17 21.7 43 0.018 Universal K-series needle roller assembly
K42X47X25 42 47 25 27.5 58 0.032 Universal K-series needle roller assembly
K42X47X27 42 47 27 33.5 75 0.026 Universal K-series needle roller assembly
K42X47X30ZW 42 47 30 33.5 76 0.049 Universal K-series needle roller assembly
K42X48X15 42 48 15 22.4 38.6 0.054 Universal K-series needle roller assembly
K42X48X16 42 48 16 24 42.1 0.03 Universal K-series needle roller assembly
K42X48X17 42 48 17 25.7 46 0.032 Universal K-series needle roller assembly
K42X50X18 42 50 18 31.5 50 0.036 Universal K-series needle roller assembly
K42X50X20 42 50 20 35 57 0.053 Universal K-series needle roller assembly
K42X50X30 42 50 30 48.2 84.4 0.053 Universal K-series needle roller assembly
K43X48X17 43 48 17 21.6 43 0.0805 Universal K-series needle roller assembly
K43X48X27 43 48 27 33.5 75 0.03 Universal K-series needle roller assembly
K43X50X18 43 50 18 31 54 0.05 Universal K-series needle roller assembly
K45X49X19 45 49 19 18 40.5 0.041 Universal K-series needle roller assembly
K45X50X17 45 50 17 22.5 46 0.027 Universal K-series needle roller assembly
K45X50X27 45 50 27 34.5 80 0.034 Universal K-series needle roller assembly
K45X50X32 45 50 32 38.5 91 0.051 Universal K-series needle roller assembly
K45X51X36ZW 45 51 36 45 99 0.045 Universal K-series needle roller assembly
K45X52X18 45 52 18 31.5 57 0.085 Universal K-series needle roller assembly
K45X52X21 45 52 21 30 52 0.042 Universal K-series needle roller assembly