M4 M16 Carbon steel Galvanised Hexagon Nuts Class 4.8 Grade 8.8 Zinc plating Metal bolts

Hexagonal nuts and screws, bolts, and screws are used in conjunction with each other to connect and fasten machine parts. Among the most widely used types, Class 1 hexagonal nuts are categorized into A, B, and C grades. A and B grade nuts feature smoother surfaces and are suitable for precision machinery, equipment, or structures, while C grade nuts are used for rougher surfaces with lower precision requirements.

Type 2 hexagonal nuts are thicker and commonly used in applications requiring frequent assembly and disassembly. Thin hexagonal nuts are used where space is limited on connected machine parts.

The design of hexagonal nuts provides excellent torque transmission capacity and can withstand significant axial and radial loads.

Applications:

• Construction: Used in steel structures, frames, and bridges to ensure stability and safety.
• Mechanical Engineering: Fixes components in automobiles, ships, aviation, and machine tools for reliable operation.
• Electronics: Special hexagonal bolts ensure tightness and stability of electronic components.
• Home Maintenance: Commonly used in furniture assembly and bicycle repairs.

Hexagon nuts come in various classifications and specifications to meet different engineering needs. For example, Class 1 hexagon nuts have single-sided chamfers, while Class 3 have double-sided chamfers. Pocket nuts (with non-through screw holes) are often used decoratively, while butterfly nuts are ideal for space-limited applications like automobile wheels.

Zinc is an amphoteric metal that resists corrosion in dry air but forms a protective carbonate film in humid conditions. In environments with sulfur dioxide or hydrogen sulfide, zinc's corrosion resistance decreases. With a standard electrode potential of -0.76V, zinc plating acts as an anodic coating for steel, providing excellent corrosion protection when properly passivated.

Cold Galvanizing (Electro-Galvanizing) Process: After degreasing and pickling, components are placed in a zinc salt solution and connected to a negative electrode, while a zinc plate serves as the positive electrode. Current deposits a zinc layer on the components.

Performance Characteristics:

• Thick, uniform zinc plating with good corrosion resistance
• Chromate passivation creates white, colored, or military green finishes
• Excellent ductility for cold forming without damaging the coating

Applications: Widely used in machinery manufacturing, electronics, aerospace, and transportation industries.