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）
K15X20X13 15 20 13 9.9 11.5 0.0063 Universal K-series needle roller assembly
K15X21X15 15 21 15 14.3 16.4 0.007 Universal K-series needle roller assembly
K15X21X17 15 21 17 15.1 17.2 0.011 Universal K-series needle roller assembly
K15X21X21 15 21 21 19.4 24.3 0.014 Universal K-series needle roller assembly
K16X20X10 16 20 10 7.8 9.9 0.017 Universal K-series needle roller assembly
K16X20X11 16 20 11 8.3 10.5 0.0055 Universal K-series needle roller assembly
K16X20X13 16 20 13 8.9 11.8 0.0061 Universal K-series needle roller assembly
K16X20X16 16 20 16 10.7 14.6 0.0075 Universal K-series needle roller assembly
K16X20X17 16 20 17 11.7 16.8 0.0083 Universal K-series needle roller assembly
K16X21X18 16 21 18 14 17.7 0.01 Universal K-series needle roller assembly
K16X21X20 16 21 20 14.7 18.9 0.012 Universal K-series needle roller assembly
K16X21X25 16 21 25 18.3 25.1 0.0136 Universal K-series needle roller assembly
K16X22X12 16 22 12 11.5 12.5 0.0166 Universal K-series needle roller assembly
K16X22X13 16 22 13 12.4 13.9 0.01 Universal K-series needle roller assembly
K16X22X14 16 22 14 11.6 12.5 0.012 Universal K-series needle roller assembly
K16X22X16 16 22 16 14.8 17.5 0.0115 Universal K-series needle roller assembly
K16X22X17 16 22 17 14.2 16.1 0.012 Universal K-series needle roller assembly
K16X22X20 16 22 20 18.3 22.8 0.0138 Universal K-series needle roller assembly
K16X24X20 16 24 20 21.4 23.5 0.017 Universal K-series needle roller assembly
K17X21X10 17 21 10 8.1 10.6 0.022 Universal K-series needle roller assembly