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）
K68X74X20 68 74 20 35.5 84 0.141 Universal K-series needle roller assembly
K68X74X30 68 74 30 46.5 118 0.071 Universal K-series needle roller assembly
K68X74X35ZW 68 74 35 48.5 125 0.1 Universal K-series needle roller assembly
K68X75X21 68 75 21 45.5 101 0.12 Universal K-series needle roller assembly
K68X75X32ZW 68 75 32 54 128 0.077 Universal K-series needle roller assembly
K68X76X20 68 76 20 41.8 82.2 0.132 Universal K-series needle roller assembly
K70X76X20 70 76 20 36 86 0.0865 Universal K-series needle roller assembly
K70X76X30 70 76 30 52 139 0.071 Universal K-series needle roller assembly
K70X77X21 70 77 21 45 101 0.11 Universal K-series needle roller assembly
K70X78X20 70 78 20 42.5 84.9 0.08 Universal K-series needle roller assembly
K70X78X23 70 78 23 49.5 103 0.089 Universal K-series needle roller assembly
K70X78X25 70 78 25 52 112 0.107 Universal K-series needle roller assembly
K70X78X30 70 78 30 60 135 0.124 Universal K-series needle roller assembly
K70X78X46ZW 70 78 46 78 189 0.148 Universal K-series needle roller assembly
K70X80X30 70 80 30 73 148 0.225 Universal K-series needle roller assembly
K72X79X21 72 79 21 46.5 106 0.15 Universal K-series needle roller assembly
K72X80X20 72 80 20 41.5 85 0.085 Universal K-series needle roller assembly
K73X79X20 73 79 20 37 90 0.098 Universal K-series needle roller assembly
K73X79X30 73 79 30 54.5 146 0.075 Universal K-series needle roller assembly
K75X81X20 75 81 20 37.5 94 0.106 Universal K-series needle roller assembly