Non-Separable Thrust NeddleRoller Bearings Series : 51100, 51200, 51300, 51400. A thrust needle roller and cage assembly and a pressed steel bearing ring are integrated into a non-separable compact easy-to-handle bearing unit. Features Inseparable cage-ring combination allows easy handling (simpler assembly work). No need for grinding of a companinon componenr ensures VA. Optional special bearing ring design can enhance the amount of oil flowing through the bearing and provide error free bearing assembly work.