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）
K50X55X17 50 55 17 22.1 47 0.03 Universal K-series needle roller assembly
K50X55X20 50 55 20 26.5 60 0.035 Universal K-series needle roller assembly
K50X55X27 50 55 27 35.6 84.1 0.043 Universal K-series needle roller assembly
K50X55X30 50 55 30 39 97 0.0505 Universal K-series needle roller assembly
K50X57X18 50 57 18 33.5 63 0.065 Universal K-series needle roller assembly
K50X58X20 50 58 20 35.5 62 0.047 Universal K-series needle roller assembly
K50X58X25 50 58 25 44 81 0.075 Universal K-series needle roller assembly
K50X58X30 50 58 30 51.7 97.8 0.09 Universal K-series needle roller assembly
K50X58X35 50 58 35 58.3 114 0.0965 Universal K-series needle roller assembly
K52X57X12 52 57 12 18 36.5 0.113 Universal K-series needle roller assembly
K52X58X17 52 58 17 28.3 56 0.024 Universal K-series needle roller assembly
K52X58X19 52 58 19 32 65.5 0.041 Universal K-series needle roller assembly
K52X60X24 52 60 24 44 80.8 0.048 Universal K-series needle roller assembly
K55X60X17 55 60 17 25.8 58 0.08 Universal K-series needle roller assembly
K55X60X20 55 60 20 28.5 66 0.043 Universal K-series needle roller assembly
K55X60X27 55 60 27 38 97 0.04 Universal K-series needle roller assembly
K55X60X30 55 60 30 41 108 0.06 Universal K-series needle roller assembly
K55X60X40ZW 55 60 40 48.5 133 0.071 Universal K-series needle roller assembly
K55X61X19 55 61 19 33 69.5 0.099 Universal K-series needle roller assembly
K55X61X20 55 61 20 32.6 68.5 0.051 Universal K-series needle roller assembly