This locknut secures bearing rings on a shaft by transmitting axial clamping force through a threaded connection, holding the assembly in a fixed axial position. With an outside diameter of 65.0 mm and a height of 14.0 mm, it weighs 0.19 kg net, dimensions that set it for a specific shaft thread size within the ZM series. As a precision accessory, ZM45 is intended for applications where accurate axial positioning and secure locking of bearing rings is required. Correct tightening prevents the ring from shifting under load, and the part should be matched with a corresponding lock washer for reliable retention against loosening from vibration or rotation.