M18 Carbon steel black-plated outer hexagon bolt 8.8 High strength hexagon head screw half tooth full tooth enlarged extension bolt

These M18 outer hexagon bolts are constructed from 8.8 grade high-strength carbon steel with a black-plated finish, delivering excellent hardness, tensile strength, and wear resistance for heavy-duty applications. They are offered in both full-thread and half-thread designs, with an enlarged extended structure to meet diverse assembly and connection needs in engineering and machinery.

 

The black plating provides effective rust and corrosion protection, ensuring stable performance in industrial and construction environments. The standard hexagon head allows secure tightening with standard wrenches, ensuring stable installation and firm fastening under heavy loads and long-term use.

 

Widely applied in mechanical equipment assembly, construction engineering, steel structure fixing, vehicle maintenance, and industrial infrastructure projects, these bolts are ideal for scenarios requiring high load-bearing capacity and reliable connection. Each product undergoes strict quality control to ensure consistent size, accurate thread, and stable mechanical performance, making them a dependable choice for professional construction and industrial maintenance.