Introduction
Cylindrical roller bearings have a large load capacity and mainly bear radial loads. Its structure is simple, including cylindrical rolling elements, inner rings, outer rings, and retainers. Single-row cylindrical roller bearings are the most basic type. Its different structures are reflected in the different designs of the ribs. Common basic cylindrical roller bearing types include N NU, NJ NF, and NUP.
The following chart is a simple summary of the comparison of the different rib types for cylindrical roller bearings.
| Type | Inner Ring | Outer Ring | Axial Displacement | Axial Load |
|---|---|---|---|---|
| N | Double Rib | No Rib | Large | None |
| NU | No Rib | Double Rib | Large | None |
| NJ | Double Rib | Single Rib | Limited | Small One-Way |
| NF | Double Rib | Single Rib | Poor | Large One-Way |
| NUP | Single Rib + Loose Ring | Double Rib | Restricted | Two-Way |
