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）
K45X53X20 45 53 20 39 67 0.034 Universal K-series needle roller assembly
K45X53X21 45 53 21 38.5 67 0.055 Universal K-series needle roller assembly
K45X53X22 45 53 22 42.5 76 0.06 Universal K-series needle roller assembly
K45X53X25 45 53 25 41.5 71.1 0.06 Universal K-series needle roller assembly
K45X53X28 45 53 28 52 98 0.0715 Universal K-series needle roller assembly
K45X53X30 45 53 30 47.8 85.3 0.081 Universal K-series needle roller assembly
K45X53X35 45 53 35 53.9 99.5 0.086 Universal K-series needle roller assembly
K45X55X27 45 55 27 50.3 78.2 0.101 Universal K-series needle roller assembly
K45X59X18 45 59 18 44.5 54 0.0905 Universal K-series needle roller assembly
K45X59X32 45 59 32 73 103 0.072 Universal K-series needle roller assembly
K45X59X36 45 59 36 76 109 0.148 Universal K-series needle roller assembly
K47X52X17 47 52 17 23.3 49 0.159 Universal K-series needle roller assembly
K47X52X27 47 52 27 35 83 0.035 Universal K-series needle roller assembly
K47X53X25 47 53 25 38.5 82 0.051 Universal K-series needle roller assembly
K47X55X28 47 55 28 53 101 0.051 Universal K-series needle roller assembly
K48X53X20 48 53 20 26.8 57.6 0.08 Universal K-series needle roller assembly
K48X53X37.5ZW 48 53 37.5 41.5 101 0.037 Universal K-series needle roller assembly
K48X54X19 48 54 19 30.5 61 0.072 Universal K-series needle roller assembly
K48X54X20 48 54 20 30.6 60.4 0.046 Universal K-series needle roller assembly
K50X55X13.5 50 55 13.5 18.2 36.5 0.046 Universal K-series needle roller assembly