The adjusting locking/unlocking nuts and rings are used whenever precision mechanisms require a precision clamping as well as a powerful and safe locking, but above all for adjusting and clamping all type of bearings. The original clamping system is constituted from a part of the threaded section of the adjusting nut or ring (threaded clamping spring). When tightening the hexagon grub screws clamping is applied with a very strong pressure onto the threaded spring which meshes perfectly into the corresponding threads of the shaft or spindle. The Nadella adjusting nuts and rings can be easily mounted, dismounted and reused without losing the precision features.