The Rexroth R165181420 is a high-precision Ball Runner Block from the FNS series, designed for linear guide systems. This component features a flanged, normal length, and standard height format (FNS), making it suitable for applications requiring high rigidity and load-bearing capacity. Constructed from durable carbon steel, it operates with four rows of balls, ensuring smooth and precise motion. With a normal accuracy class (N) and low preload (C1), it provides stable and reliable performance in demanding industrial environments such as machine tools, automation equipment, and robotics. This runner block is engineered for interchangeability and can be combined with all Rexroth ball rail systems of the same size and accuracy.