The NATR roller is not a standard bearing unit, but rather a needle roller and cage assembly with lateral flanges (side flanges). The "NATR" designation typically refers to a specific standardized type. Its primary function is to serve as a precise guiding and support element for chains, belts, or other articulated components in transmission systems. The integral flanges on both sides of the assembly are the key feature, providing axial guidance and retention, preventing lateral displacement of the supported component. This design is critical in applications like silent chains, where it ensures the chain runs smoothly and maintains proper engagement with sprockets. The assembly requires a hardened and ground shaft as its inner raceway.
