The Bosch Rexroth R165349420 is a high-precision Ball Runner Block designed for linear motion systems. Part of the Ball Rail Systems, this FLS (Flanged, Long, Standard Height) model is engineered for high load-bearing capacity and rigidity. It operates with exceptional smoothness and low friction, making it ideal for demanding applications in machine tools, industrial automation, and robotics. The carbon steel construction ensures durability and long service life, while the preload-free (C0) design allows for straightforward integration into systems where minimal internal stress is required. This runner block is interchangeable with all Rexroth ball guide rails of the same size, offering maximum flexibility in system design and maintenance.