The Rexroth R166519320 is a high-precision Ball Runner Block designed for demanding linear motion applications. As part of the Ball Rail System, this KWD series runner block features a flanged, normal length, standard height (FKS) format. It is constructed from carbon steel for durability and rigidity. The integrated ball chain ensures low noise levels, optimal travel behavior, and reduced lubricant consumption. With a C0 preload class (no preload) and H accuracy class (high), this component provides exceptionally smooth and precise guidance, making it ideal for use in machine tools, automation equipment, and industrial robotics where reliable linear movement is critical.