Abstract: This quill stop device is designed to replace the old-type quill stop devices used on milling and other machines, such as drill presses. Primarily, it consists of a threaded shaft, having a ring with a cut-out opening in its side, so as to be placed quickly and removed on the machine, for setting depth limits, and the ring is made of nylon material, so as to engage the threads of the shaft frictionally at all times.