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）
K3X5X9 3 5 9 1.71 1.48 0.0003 Universal K-series needle roller assembly
K3X6X7 3 6 7 1.43 0.97 0.0004 Universal K-series needle roller assembly
K4X7X7 4 7 7 1.74 1.27 0.0004 Universal K-series needle roller assembly
K4X7X10 4 7 10 2.33 1.84 0.0005 Universal K-series needle roller assembly
K5X8X7 5 8 7 2.07 1.6 0.0007 Universal K-series needle roller assembly
K5X8X8 5 8 8 2.35 1.92 0.00053 Universal K-series needle roller assembly
K5X8X10 5 8 10 3 2.65 0.0007 Universal K-series needle roller assembly
K6X9X7 6 9 7 2.31 1.9 0.0009 Universal K-series needle roller assembly
K6X9X8 6 9 8 2.6 2.28 0.00063 Universal K-series needle roller assembly
K6X9X10 6 9 10 3.35 3.15 0.0008 Universal K-series needle roller assembly
K6X10X13 6 10 13 3.8 3.1 0.0011 Universal K-series needle roller assembly
K7X9X7 7 9 7 1.73 1.77 0.0019 Universal K-series needle roller assembly
K7X10X8 7 10 8 2.85 2.65 0.0006 Universal K-series needle roller assembly
K7X10X10 7 10 10 3.65 3.6 0.0009 Universal K-series needle roller assembly
K8X11X8 8 11 8 3.1 3 0.001 Universal K-series needle roller assembly
K8X11X10 8 11 10 3.95 4.1 0.001 Universal K-series needle roller assembly
K8X11X13 8 11 13 5.1 5.8 0.0012 Universal K-series needle roller assembly
K8X12X8 8 12 8 3.55 3.05 0.0017 Universal K-series needle roller assembly
K8X12X10 8 12 10 5 4.7 0.0004 Universal K-series needle roller assembly
K8X12X11 8 12 11 4.63 4.17 0.002 Universal K-series needle roller assembly