12-14x20 Hex Head Self-drilling Screw

Product Overview
This product is an integrated waterproof self-drilling screw specifically for outdoor steel structures. It comes with an integrated EPDM composite sealing washer, and the surface uses a CL3 long-term anti-corrosion coating. It integrates drilling, tapping, and waterproof fastening into one, requiring no pre-drilling or additional sealant. It balances high load-bearing capacity with outdoor rust-resistance, serving as a standard fastener for color steel construction and light steel structure projects.

Product Applications
Fixing color steel tiles and sandwich panel roofs/walls for factories, warehouses, and prefabricated houses.
Assembly of light steel structures like rain sheds, fences, and railings.
Outdoor metal components like photovoltaic mounts, metal curtain walls, and ventilation ducts.
Suitable for 0.4–5mm color steel plates, cold-rolled steel, and aluminum alloys; applicable to inland factory areas and low-salt spray coastal regions.