CG125 motorcycle cylinder head locking nut, nut size, flange seat structure and CG125 cylinder head installation position fully match, directly replace the original nut, compatible with cylinder head, cylinder body and other components, without the need to modify the installation structure; Using high quality alloy steel processing + surface galvanized treatment, high strength, rust resistance, can withstand the cylinder head tightening torque, long-term use is not easy to slip or deformation; The flange seat design increases the contact area, which can effectively prevent the nut from loosening in the engine vibration, and ensure the sealing and fixed stability of the cylinder head; It is a necessary part for cylinder head disassembly and sealing maintenance, and is suitable for engine cylinder head overhaul/maintenance scenarios.