The 31.60.202 main spindle clamping fingers sleeve is a precision mechanical component designed for Gildemeister DMG Mori GS20 and GM20AC multi-spindle lathes, used in the bar clamping system with 9017E bar clamping collet for machining bars up to 35mm maximum diameter. The main function of the sleeve is to take rotation from the main spindle and act as the operating support for clamping fingerss 3101108 and ring 3101107, components that through their mechanical action push on bushing 3101110 and bell 0801351, generating the pullback movement required to close the collet on the bar. In this configuration, the sleeve is not merely a housing body but a kinematic element connecting main spindle rotation with the bar closing control system, maintaining motion continuity, correct orientation of the thrust elements and controlled transmission of loads between clamping fingerss, ring, bushing, bell and collet. During the working cycle, rotation from the main spindle is transferred to the sleeve; clamping fingerss 3101108 and ring 3101107 housed in the component act as command and thrust elements, while their action on bushing 3101110 and bell 0801351 produces the pullback of the clamping chain, allowing collet 9017E to close stably on the bar. This sequence requires precise seats, intact sliding surfaces, correct guidance of the key and absence of abnormal play, because any wear in the keyway or sliding areas can change stroke regularity, alter load distribution and reduce clamping repeatability. The component is especially important because it works on bars up to 35mm diameter, where mass, inertia and clamping loads are high and any loss of stability may generate micro movements, vibration, slipping, loss of concentricity, cutting instability, dimensional errors, form errors and workpiece geometry defects. From a kinematic point of view, sleeve 3160202 participates in several machine functions: it receives and follows main spindle rotation, houses and positions clamping fingerss 3101108, integrates ring 3101107 into the command sequence, enables thrust transmission toward bushing 3101110 and bell 0801351, generates the pullback movement required for closure of collet 9017E and keeps the bar clamping group behavior coordinated with the spindle drum, bar feeding system, main spindles, possible front tool spindles, radial slides, axial slides and auxiliary machine systems. Correctly controlled bar gripping allows subsequent machining stations to work on a stable and well positioned workpiece, improving dimensional repeatability, surface quality, geometry control and production continuity. Over time, the sleeve may wear significantly in the keyway seat, which is a sliding and functional locating area; wear may cause increased play, loss of guidance, irregular movement, poor phase accuracy between command elements and deterioration of force transmission. For this reason, the part must be inspected during replacement of clamping fingerss, checking the condition of the keyway seat, support surfaces, contact areas and parts subject to compression and rubbing. If wear marks, steps, ovalization, deep impressions, deformation or abnormal play are found, replacement of the sleeve becomes a recommended technical intervention to restore the correct pullback kinematics and full efficiency of collet closure. For preventive and extraordinary maintenance departments, machine tool builders, automatic turning shops, automotive production and precision engineering, the 31.60.202 clamping fingers sleeve is a critical spare part for maintaining reliability, clamping precision and production continuity on Gildemeister DMG Mori GS20 and GM20AC multi-spindle lathes. Tadaah offers this component as a functional part of the main spindle group, to be assessed not only for dimensional compatibility but also for its kinematic role in rotation transmission, clamping fingers control and controlled closure of the 9017E bar clamping collet.