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）
K28X33X26ZW 28 33 26 23.9 42 0.017 Universal K-series needle roller assembly
K28X33X27 28 33 27 23.3 41 0.033 Universal K-series needle roller assembly
K28X34X14 28 34 14 17.5 24.8 0.019 Universal K-series needle roller assembly
K28X34X17 28 34 17 21.8 33.5 0.02 Universal K-series needle roller assembly
K28X35X16 28 35 16 21.5 29.5 0.024 Universal K-series needle roller assembly
K28X35X18 28 35 18 24 34 0.024 Universal K-series needle roller assembly
K28X35X27 28 35 27 35 55 0.027 Universal K-series needle roller assembly
K28X35X28 28 35 28 33.2 50.6 0.041 Universal K-series needle roller assembly
K28X36X20 28 36 20 26.5 34.7 0.0445 Universal K-series needle roller assembly
K28X40X18 28 40 18 33.5 37 0.0385 Universal K-series needle roller assembly
K28X40X25 28 40 25 45.5 55 0.05 Universal K-series needle roller assembly
K28X41X38 28 41 38 58.7 71.1 0.07 Universal K-series needle roller assembly
K29X34X17 29 34 17 18.9 31 0.11 Universal K-series needle roller assembly
K29X34X27 29 34 27 28.1 52 0.022 Universal K-series needle roller assembly
K29X38X25 29 38 25 35.8 47.8 0.033 Universal K-series needle roller assembly
K30X34X13 30 34 13 12.3 21.7 0.0407 Universal K-series needle roller assembly
K30X35X11 30 35 11 12.2 18 0.014 Universal K-series needle roller assembly
K30X35X13 30 35 13 15.6 25.5 0.014 Universal K-series needle roller assembly
K30X35X16 30 35 16 17.5 28.7 0.014 Universal K-series needle roller assembly
K30X35X17 30 35 17 19.6 34 0.0189 Universal K-series needle roller assembly