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）
K40X45X17 40 45 17 21.4 41.5 0.022 Universal K-series needle roller assembly
K40X45X21 40 45 21 24.9 50 0.031 Universal K-series needle roller assembly
K40X45X27 40 45 27 33 73 0.033 Universal K-series needle roller assembly
K40X45X30ZW 40 45 30 26.5 54 0.046 Universal K-series needle roller assembly
K40X46X17 40 46 17 25 45 0.058 Universal K-series needle roller assembly
K40X47X18 40 47 18 29.5 50 0.028 Universal K-series needle roller assembly
K40X47X20 40 47 20 32.5 57 0.039 Universal K-series needle roller assembly
K40X48X17 40 48 17 28.1 41.6 0.042 Universal K-series needle roller assembly
K40X48X20 40 48 20 36 59 0.044 Universal K-series needle roller assembly
K40X48X25 40 48 25 39.3 64 0.049 Universal K-series needle roller assembly
K40X48X34 40 48 34 51.1 89.6 0.0645 Universal K-series needle roller assembly
K40X50X15 40 50 15 28.2 35.9 0.0875 Universal K-series needle roller assembly
K40X50X17 40 50 17 30.2 39.2 0.0485 Universal K-series needle roller assembly
K40X50X20 40 50 20 35.7 48.6 0.0565 Universal K-series needle roller assembly
K40X52X38ZW 40 52 38 65 93 0.061 Universal K-series needle roller assembly
K40X54X32 40 54 32 66.8 87.2 0.158 Universal K-series needle roller assembly
K40X54X50 40 54 50 93.6 134 0.144 Universal K-series needle roller assembly
K40X54X63 40 54 63 115 175 0.215 Universal K-series needle roller assembly
K41X48X35 41 48 35 47.8 90.8 0.27 Universal K-series needle roller assembly
K42X47X13 42 47 13 17.8 33.5 0.0785 Universal K-series needle roller assembly