Self-drilling screws are critical fasteners for metal roofing, steel structures and light steel projects. However, improper selection or poor manufacturing easily leads to on-site failures, causing water leakage, maintenance costs and project disputes.

Main typical failures on construction sites

◎Screw breaking during installation

Caused by unqualified heat treatment. The screw becomes overly brittle without proper core toughness. It cannot bear torque when drilling steel sheets.

◎Drill point wears quickly / fails to penetrate steel plate

Insufficient carburizing hardening on the drill tip. Low hardness makes the point blunt rapidly; workers waste time and damage power tools.

◎Roof water leakage

Low-quality PVC washers age, crack and lose sealing ability after sun exposure. Premium EPDM bonded aluminum washers are essential for outdoor metal roofs.

◎Thread stripping or head twisting off

Mismatched drill tail size, wrong electric drill torque or rough thread production. The screw cannot form stable engagement with metal panels.

◎Early rust & corrosion stains

Thin electroplating without anti-corrosion treatment. For humid coastal areas, mechanical galvanizing or Ruspert coating is strongly recommended.

Key suggestion

Choosing standardized self-drilling screws with stable production control avoids most construction risks. Reasonable matching of drill tail type, surface coating and sealing washer protects long-term project safety.

Contact us for full specifications and samples for your metal construction market.