Cov txheej txheem tshwj xeeb thiab cov yam ntxwv zoo:
1. Qhov saum npoo yog galvanized, nrog siab ci, zoo nkauj tsos, thiab muaj zog corrosion kuj (optional deg kho txheej txheem xws li dawb zinc plating, xim zinc plating, dub phosphating, grey phosphating, thiab npib tsib xee plating).
2. Carburized thiab tempered, saum npoo hardness siab, uas tuaj yeem ncav cuag lossis tshaj tus nqi tus qauv.
3. Advanced technology, me me twisting torque thiab siab locking kev ua tau zoo.