Locking elements encompass mechanical fastening components and keyless shaft-hub devices engineered to prevent self-loosening under vibration, thermal expansion, or dynamic loading. Threaded locking variants utilize prevailing torque, free-spinning serrations, or positive locking mechanisms to maintain clamping force and resist rotational backing off. Keyless shaft-hub elements rely on high radial pressure and friction to transmit torque precisely, making them vital for heavy industrial machinery, gearboxes, automotive drivetrains, and rotating conveyor systems.