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）
K24X28X13 24 28 13 11 17.6 0.0085 Universal K-series needle roller assembly
K24X28X16 24 28 16 13.4 22.2 0.01 Universal K-series needle roller assembly
K24X28X17 24 28 17 14.5 25 0.012 Universal K-series needle roller assembly
K24X28X34ZW 24 28 34 21.6 40.7 0.013 Universal K-series needle roller assembly
K24X29X13 24 29 13 13.6 19.7 0.027 Universal K-series needle roller assembly
K24X30X17 24 30 17 19.5 27.5 0.014 Universal K-series needle roller assembly
K24X30X20 24 30 20 20.3 28.5 0.019 Universal K-series needle roller assembly
K24X30X31ZW 24 30 31 27.5 43.5 0.0235 Universal K-series needle roller assembly
K25X29X10 25 29 10 9.9 15.4 0.032 Universal K-series needle roller assembly
K25X29X13 25 29 13 11.3 18.4 0.0085 Universal K-series needle roller assembly
K25X29X17 25 29 17 14.9 26 0.011 Universal K-series needle roller assembly
K25X30X13 25 30 13 14.6 21.8 0.014 Universal K-series needle roller assembly
K25X30X16 25 30 16 16.3 24.6 0.011 Universal K-series needle roller assembly
K25X30X17 25 30 17 18.7 30 0.0162 Universal K-series needle roller assembly
K25X30X20 25 30 20 21.7 36.5 0.016 Universal K-series needle roller assembly
K25X30X26ZW 25 30 26 21.4 35.5 0.018 Universal K-series needle roller assembly
K25X30X39ZW 25 30 39 29.8 53.5 0.019 Universal K-series needle roller assembly
K25X31X13 25 31 13 14.3 18.4 0.04 Universal K-series needle roller assembly
K25X31X14 25 31 14 16.5 22.1 0.0162 Universal K-series needle roller assembly
K25X31X16 25 31 16 17.8 24.4 0.018 Universal K-series needle roller assembly