The 53.01.387 main spindle collet clamping fingers is a precision mechanical component designed for the Gildemeister DMG Mori GM16AC multi-spindle lathe, used in the bar clamping system with Q0001870 bar clamping collet for machining bars up to 16mm maximum diameter. clamping fingers 5301387 are housed in the slots of sleeve 5301389 and work as lever, support and thrust transmission elements between ring 5301382, ring 5301384 and bell 5301386. Through the lever movement of the bell, the clamping fingers transfer load to the command chain and allow the pullback movement required to close the collet on the bar. In this system, the clamping finger is not merely a contact element but a kinematic component that transforms and directs the command force, maintaining the correct sequence between main spindle rotation, sleeve position, support on the rings and collet pullback movement. During the working cycle, sleeve 5301389 takes rotation from the main spindle and carries the clamping fingers housed in its slots; these elements must remain correctly guided, supported and synchronized so that the movement of bell 5301386 is converted into regular thrust on ring 5301382 and ring 5301384. The quality of contact between clamping finger, sleeve slot and rings affects stroke accuracy, clamping repeatability and bar gripping stability. If the clamping fingers operate with excessive play, marked surfaces or irregular sliding, closure of collet Q0001870 may become less uniform, with reduced effective force on the bar, increased vibration, micro slipping, loss of concentricity, cutting instability, dimensional errors, form errors and workpiece geometry defects. From a kinematic point of view, clamping finger 5301387 participates in several functions of the main spindle group: it follows the rotation of sleeve 5301389, works in the slots as a guided element, receives and transmits the thrust generated by the lever movement of bell 5301386, bears against rings 5301382 and 5301384, contributes to pullback of the clamping chain and allows controlled closure of bar clamping collet Q0001870. This function must remain coordinated with the spindle drum, bar feeding system, main spindles, possible front tool spindles, radial slides, axial slides and auxiliary machine systems, because any irregularity in bar gripping can affect subsequent operations and production continuity of the multi-spindle lathe. Even when machining bars up to 16mm diameter, clamping precision is essential for maintaining surface quality, dimensional repeatability, geometry control and cycle stability. Over time, the clamping finger may wear on the support surfaces and in the sliding areas inside the sleeve slots; the keyway seat and sliding zone connected to the guiding system must also be carefully checked, because wear in these areas can increase play, worsen functional parallelism, make thrust irregular and reduce phase accuracy between command elements. For this reason, the part is checked during replacement of clamping fingers and during service work on sleeve 5301389, verifying the condition of contact surfaces, working edges, housing slots, support marks and areas subject to compression and rubbing. If wear marks, deformation, steps, rounded edges, deep impressions or abnormal play are present, replacement of the clamping finger becomes a necessary technical intervention to restore correct pullback kinematics and full efficiency of collet closure. For preventive and extraordinary maintenance departments, automatic turning shops, machine tool builders, automotive production and precision engineering, the 53.01.387 collet clamping fingers is a critical spare part for maintaining clamping reliability, main spindle stability and production continuity on the Gildemeister DMG Mori GM16AC multi-spindle lathe. Tadaah offers this component as a functional element of the clamping finger sleeve and collet closing system, to be assessed not only for dimensional compatibility but also for its kinematic role in thrust transmission, group pullback and controlled closure of the Q0001870 bar clamping collet.