Core definition Cylindrical roller bearings are a key type of rolling bearing featuring parallel raceways and cylindrical rollers on inner and outer rings. They primarily support radial loads and can withstand certain axial loads. They offer radial load capacity and good speed performance, making them suitable for applications that require both load handling and speed. Main structure Basic components: outer ring, inner ring, cylindrical rollers, and a cage. Some models include seals or dust covers. Geometry: the raceways on both rings are cylindrical, and the rollers run parallel to these raceways. Function of the cage: the cage evenly spaces the rollers to reduce friction and prevent contact collisions. Sealing: seals or dust covers help prevent lubricant loss and entry of contaminants, extending service life. Common types Singlerow cylindrical roller bearings NU type: inner ring with no ribs. NJ type: inner ring with a single rib. Doublerow cylindrical roller bearings Greater radial load capacity, suitable for heavier machinery. Variants: some models are equipped with cages, while others use full complement (no cage) rollers, depending on the required performance and load characteristics. Key benefits and why customers need them radial load capacity with reliable speed performance, enabling efficient operation in demanding mechanical systems. Flexible configurations (NU, NJ, singlerow or doublerow) to match specific load, speed, and space requirements. Sealed or dustcovered options available to extend service life by reducing lubricant loss and contaminant ingress. Cage designs minimize friction and roller contact, improving smoothness and longevity; full complement variants provide maximum loadbearing capacity in compact forms. Notes on compatibility and performance Raceways and rollers are designed for parallel alignment to optimize load distribution and reduce friction. The cage arrangement helps manage roller spacing, enhancing stability during operation. Seals and dust covers are available to suit environments where contamination or lubricant retention is a concern. Size, material, and configuration considerations Bearing type selection should consider bore size, outer diameter, width, and the presence of ribs on the inner ring (NU vs NJ) or the choice between singlerow and doublerow configurations. Choose between cages or full complement rollers based on the required balance of load capacity, speed, and maintenance needs. Use scenarios Use scenario 1: speed spindle applications in machine tools and precision machinery that require strong radial support with compatible axial capability. Use scenario 2: Heavy machinery and gearboxes that demand radial load capacity and robust stability, such as presses, rolling mills, or other equipment with substantial radial forces. Use scenario 3: Industrial equipment operating in dusty or harsh environments where seals or dust covers are beneficial to extend bearing life and reduce maintenance frequency. Optional configurations and considerations If contamination control is critical, select models with seals or dust covers. If the application emphasizes maximum load capacity within a compact form, consider doublerow designs or full complement variants. When locating bearings in spaceconstrained layouts, evaluate NU vs NJ inner ring rib configurations to ensure proper fit and performance.