Spiral key mechanical lock cylinder

The utility model relates to a spiral key mechanical lock core, which comprises a lock body, a lock core, a key, a plug, a spring, a marble and a circlip for a hole, wherein the key insertion end is cylindrical and has a spiral shape. The thread key tooth is provided with a thread matched with the thread key on the key hole of the lock cylinder. Since the marble is concealed in the internal thread of the lock cylinder, it is difficult to open the keyhole with a common tool. The invention solves the problem that the traditional ordinary lock cylinder is not concealed and is easy to forcibly unlock. The utility model has the advantages of simple structure, easy manufacture and use, and excellent anti-theft performance. Suitable for installation on any pin lock.