Self Drilling Screws

Stainless Steel Drilling Screws (A2 / A4)

Our A2 (304) and A4 (316) Stainless Steel Drilling Screws are precision-formed fasteners made entirely from austenitic stainless steel, offering exceptional corrosion resistance—ideal for harsh environments, coastal areas, or chemically exposed applications. Unlike carbon steel or 410 stainless steel, A2 and A4 materials cannot be heat-treated, which means they do not achieve the same hardness levels required for drilling into steel or concrete.

However, through advanced cold-forming techniques, these screws can be produced in the same geometry as standard self-drilling or self-tapping screws—complete with drill points, tapping threads, and a variety of head styles. While visually and structurally similar, their application is limited to softer base materials, such as aluminum panels, light-gauge metal sheeting, or composite materials, where no hard substrate drilling is required.

These screws are the preferred choice when long-term corrosion resistance is critical and the substrate allows for installation without excessive tip wear. For fastening into harder materials, consider bi-metal screws, which combine an A2/A4 stainless body with a hardened carbon steel drill tip for superior versatility.