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）
K25X31X17 25 31 17 19.6 28.5 0.0196 Universal K-series needle roller assembly
K25X31X20 25 31 20 21.2 30.5 0.019 Universal K-series needle roller assembly
K25X31X21 25 31 21 24.7 38 0.025 Universal K-series needle roller assembly
K25X32X16 25 32 16 20.8 27.5 0.02 Universal K-series needle roller assembly
K25X32X24 25 32 24 27.7 38.7 0.021 Universal K-series needle roller assembly
K25X33X20 25 33 20 28.5 38 0.035 Universal K-series needle roller assembly
K25X33X24 25 33 24 34 47 0.033 Universal K-series needle roller assembly
K25X35X15 25 35 15 22.6 23.8 0.039 Universal K-series needle roller assembly
K25X35X25 25 35 25 32.5 37.9 0.033 Universal K-series needle roller assembly
K25X35X30 25 35 30 47 62 0.048 Universal K-series needle roller assembly
K26X30X10 26 30 10 10.1 16.1 0.065 Universal K-series needle roller assembly
K26X30X13 26 30 13 11.6 19.2 0.007 Universal K-series needle roller assembly
K26X30X17 26 30 17 15.2 27.5 0.011 Universal K-series needle roller assembly
K26X30X22ZW 26 30 22 15.7 28.5 0.015 Universal K-series needle roller assembly
K26X34X22 26 34 22 24.2 30 0.012 Universal K-series needle roller assembly
K26X38X32 26 38 32 47.2 55.3 0.041 Universal K-series needle roller assembly
K28X32X17 28 32 17 15.3 27.5 0.0795 Universal K-series needle roller assembly
K28X32X21 28 32 21 18.7 35.5 0.017 Universal K-series needle roller assembly
K28X33X13 28 33 13 15.3 24.2 0.02 Universal K-series needle roller assembly
K28X33X17 28 33 17 19.7 33.5 0.013 Universal K-series needle roller assembly