The Rexroth R166579420, also known as model KWD-030-FKS-C0-N-1, is a high-precision Ball Runner Block designed for linear guidance systems. This component is part of Bosch Rexroth’s Ball Rail System and is engineered for applications requiring high rigidity, excellent travel accuracy, and significant load-bearing capacity. Its flanged, long, standard height format (FKS) provides a stable mounting platform, while the zero-clearance preload (C0) ensures maximum precision and stiffness from the outset. Constructed from robust carbon steel, it is suitable for demanding environments such as machine tools, industrial automation, and robotics.