The functionality of metal expansion nuts centers around the principle of mechanical expansion. Upon the application of torque, the screw or bolt is threaded into the nut, which, in turn, causes the nut to expand outward. This outward expansion presses the sides of the nut against the inner walls of the hole it occupies, creating a tight fit. The added friction and mechanical grip prevent the nut from loosening over time, even in dynamic conditions.

1. Metal Roofing These screws are ideal for securing metal sheets, as they can penetrate the material easily and create a watertight seal, ensuring long-lasting protection against leaks.

Conclusion

The A325 specification includes various criteria that these fasteners must meet, such as mechanical properties, dimensional tolerances, and testing procedures. One of the critical attributes of A325 bolts is their ability to withstand significant tension and shear forces, making them ideal for applications in bridges, buildings, and other infrastructure projects.