M4/M6/M8/M12/M20 Iron galvanized outer hexagon bolt combination set screw nut gasket extension screw for Construction & Furniture Assembly

This comprehensive galvanized hex bolt assortment kit includes a complete range of sizes from M4 to M20, paired with matching nuts and flat washers for convenient one-stop use. Constructed from heavy-duty iron with a galvanized surface, these bolts provide excellent rust resistance, high hardness, and long-lasting durability for both indoor and outdoor applications.

 

Featuring a standard outer hex head design, these bolts are compatible with most wrenches, ensuring easy installation, secure tightening, and stable fastening performance. The extended thread structure enhances clamping force and effectively prevents loosening under vibration, making them ideal for heavy-duty and long-term use.

 

Widely used in construction projects, furniture assembly, machinery maintenance, home repair, and various DIY applications, this all-in-one fastener set meets diverse installation needs for industrial, commercial, and household users. Complete specifications and reliable quality make it an essential hardware solution for professionals and DIY enthusiasts alike.