The 53.26.121 bushing is a guiding component mounted on the connecting rod of the Radial, front and axial slides of the Gildemeister-DMG Mori GM16AC multi-spindle automatic lathe. Its main function is to protect the connecting rod from wear and to keep pin 5326135 correctly guided, creating a stable mechanical coupling between the oscillating or transmission element and the slide movement. The part works as an intermediate element exposed to contact, load and micro sliding, stabilizing the transfer of motion between the connecting rod, pin and slide kinematic system. For this reason, bushing accuracy is essential to maintain correct group alignment, limit uncontrolled Radial or axial play and ensure a consistent response during feed, return and positioning phases of the slides involved in the machine cycle. Its case-hardened and hardened steel construction allows the guide surface to better withstand pressure, friction and repeated loads while maintaining a structure suitable for the continuous duty typical of multi-spindle machines. In the kinematics of the GM16AC this bushing is not a simple spacer, but a functional part that contributes to the transmission of motion to Radial slides, front slides, axial slides and auxiliary systems connected to machining operations, indirectly affecting the stability of the main spindles in the spindle drum and the synchronization with any front toolholder spindles. A worn bushing can increase play between pin 5326135 and the connecting rod, create motion delays, position variation, loss of repeatability, localized vibration and dimensional or geometric defects on turned parts, especially when the slide drives tools involved in turning, drilling, tapping, parting or front machining operations. Replacement should be considered when guide wear, ovalization, scoring, irregular coupling with the pin, abnormal noise or loss of workpiece accuracy are present. As a wear component, it should be checked during preventive and extraordinary maintenance together with pin 5326135, the connecting rod and the related articulation elements, in order to prevent bushing wear from being transferred to the connecting rod or to other more complex and expensive machine parts. An efficient bushing helps keep the machine kinematic chain stable, reduces the risk of scrap, preserves machining accuracy and supports production continuity on the multi-spindle lathe.