What is a locking screw? Or What is a locking head screws? Its answer is that these are used for curing bone fractures as well as disorders. We provide steel and titanium screws of locking nature which are advantageous than the conventional screw systems. Now let us understand âHow do self locking screws work?â. With the tightening of screws, the plate is locked in a specific place which ensures stabilizing of the segment without any requirement of compressing the bone to the plate. These are a type of orthopedic implants which can have the size of 5 mm and length in the range of 20 mm to 90 mm.