🟢 1. Product Overview The CPM2518 is a double-row cylindrical roller bearing without outer ring , designed specifically for planetary gearbox reducers . The outer-ring-free design allows the rollers to run directly on the gearbox housing bore, maximizing load capacity and stiffness within a compact radial space. It transmits high radial loads while permitting slight axial displacement — a standard service part for planetary reducer shafts. Interchangeable with INA CPM2518 and