Which of the following is the correct self-tapping screw size to attach steel sheathing to a metal structure?

Which of the following is the correct self-tapping screw size to attach steel sheathing to a metal structure?

• A. self tapping #2
• B. self tapping #5
• C. self tapping #7
• D. self tapping #8

Answer: (D)

When fastening steel sheathing to a metal frame, the screw needs enough bite and thread engagement to resist pull-out and shear. A larger-diameter self-tapping screw provides more bearing surface and stronger grip in the metal, which translates to better holding power and less risk of stripping the threads or loosening under load or vibration. Among common options for this task, the larger size offers the strongest, most reliable attachment without the downsides that come with smaller fasteners. Use a length that properly reaches into the framing, and consider a washer to distribute load if needed. In short, a bigger self-tapping screw is the safer, more secure choice for this application.

When fastening steel sheathing to a metal frame, the screw needs enough bite and thread engagement to resist pull-out and shear. A larger-diameter self-tapping screw provides more bearing surface and stronger grip in the metal, which translates to better holding power and less risk of stripping the threads or loosening under load or vibration. Among common options for this task, the larger size offers the strongest, most reliable attachment without the downsides that come with smaller fasteners. Use a length that properly reaches into the framing, and consider a washer to distribute load if needed. In short, a bigger self-tapping screw is the safer, more secure choice for this application.