Abstract: A locking system can comprise a screw head without threads and a thread created only inside a bore of a bone plate. The machining of thread geometry can thus pertain to the screw body, while the screw head can be formed by curved surfaces and contact surfaces by simple machining process. A plurality of screws can be implemented, and each bone plate can have a larger number of bores for accepting the screws than the number of screws. The said locking screw can be used with other bone plates having continuous or partial threads created inside their bores.