Definition: What Is a Bi-Metal Screw?

A bi-metal screw is a high-performance fastener composed of two different metals, typically stainless steel and alloy steel, followed by multiple manufacturing processes, heat treatment, and surface treatment. The definition of Bi-metal refers to a material composed of two different metals bonded together, featuring combined properties of both metals. By combining these materials, bi-metal screws offer the best of both worlds: the corrosion resistance of stainless steel and the strength of alloy steel.

The stainless steel is used for the screw head and body, which is impervious to corrosion. The alloy steel forms the tail for superior strength and penetration power. This makes bi-metal screws perfect for buildings and constructions in high erosion or extreme conditions.