Release time：2020-01-16 18:44 Browse：
Size Specification
This is an M5.5 screw. The M5.5 indicates that the nominal diameter of the screw is 5.5 mm. This size is carefully designed to meet the requirements of steel structure roof mounting, providing an appropriate balance between strength and ease of installation.
Head Design
It features an outer hexagon flange. The outer hexagon shape allows for easy tightening and loosening using common hexagonal wrenches, providing a strong torque - transfer mechanism. The flange design increases the contact area with the surface, enhancing the stability of the connection and reducing the risk of the screw sinking into the material.
Function and Application
Specifically designed as a steel structure roof mounting screw, it is tailored to the unique demands of securing roofing components in steel structures. It can effectively fasten different parts of the roof, ensuring the integrity and durability of the roof structure.
Unique Shank Feature
The knurled dovetail screw shank design is a key characteristic. The knurling provides a better grip within the drilled hole, preventing the screw from rotating or loosening easily. The dovetail shape further enhances the locking effect, making it suitable for applications where a high - strength and secure connection is required.
Material Composition
Usually crafted from high - grade steel, this M5.5 screw offers excellent tensile strength. The steel's composition is optimized to withstand the mechanical stresses associated with steel structure installations. For example, it may contain alloying elements like manganese and chromium to improve hardness and corrosion resistance, ensuring long - term performance in outdoor roof environments.
Surface Treatment
To further enhance its durability, the screw often undergoes a surface treatment. A common option is galvanization, which coats the screw with a layer of zinc. This not only protects the screw from rust and corrosion, extending its lifespan, but also provides additional lubricity during installation. Another possible treatment is passivation, which forms a protective oxide layer on the surface, enhancing its resistance to chemical attacks.
Manufacturing Process
Precision manufacturing processes are employed to create these screws. Cold forging is a typical method used to shape the head and the shank. This process improves the material's grain structure, resulting in increased strength. The threads are then formed through thread rolling, which enhances thread integrity and fatigue resistance. The knurling and dovetail shaping are also carried out with high - precision machinery to ensure consistent quality and dimensional accuracy.
Compatibility
These screws are highly compatible with a variety of roofing materials used in steel structures, such as corrugated metal sheets, metal decking, and some types of composite roofing panels. They can be used in combination with washers and nuts to create a more secure fastening system, and are suitable for both new construction projects and roof repair or retrofit jobs.
