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）
K17X21X13 17 21 13 10.4 14.6 0.0055 Universal K-series needle roller assembly
K17X21X15 17 21 15 10.4 14.4 0.0065 Universal K-series needle roller assembly
K17X21X17 17 21 17 12.2 17.9 0.0082 Universal K-series needle roller assembly
K17X22X20 17 22 20 15.5 20.5 0.0095 Universal K-series needle roller assembly
K17X23X11 17 23 11 10.1 10.5 0.014 Universal K-series needle roller assembly
K17X23X15 17 23 15 13.3 15.1 0.0096 Universal K-series needle roller assembly
K17X23X17 17 23 17 14.4 16.5 0.0131 Universal K-series needle roller assembly
K17X24X18 17 24 18 16.5 18 0.016 Universal K-series needle roller assembly
K18X22X8 18 22 8 6.06 7.27 0.0186 Universal K-series needle roller assembly
K18X22X10 18 22 10 8.4 11.3 0.0047 Universal K-series needle roller assembly
K18X22X13 18 22 13 9.2 12.7 0.006 Universal K-series needle roller assembly
K18X22X16 18 22 16 11.6 16.7 0.008 Universal K-series needle roller assembly
K18X22X17 18 22 17 12.1 18 0.0092 Universal K-series needle roller assembly
K18X23X20 18 23 20 14.6 19.3 0.011 Universal K-series needle roller assembly
K18X24X12 18 24 12 12.8 14.9 0.015 Universal K-series needle roller assembly
K18X24X13 18 24 13 13.1 15.3 0.012 Universal K-series needle roller assembly
K18X24X16 18 24 16 15.1 17.9 0.013 Universal K-series needle roller assembly
K18X24X17 18 24 17 16 19.4 0.0148 Universal K-series needle roller assembly
K18X24X20 18 24 20 20.2 27 0.0157 Universal K-series needle roller assembly
K18X25X14 18 25 14 16.8 19.3 0.018 Universal K-series needle roller assembly