This screw features a large hex flange head and is equipped with a single black washer. The threads have a special design with knurled serrations on both the upper and lower sections, which greatly enhance the fastening strength and prevent loosening during use. The screw tip is a drill point shape, enabling self-drilling functionality that requires no pre-drilling. It can easily penetrate metal sheets from 0.8mm to 3.0mm thick.
The single washer improves waterproof performance effectively, preventing leaks and increasing the overall durability of the screw. To meet diverse market demands, surface treatments include zinc plating and Dacromet coating, which significantly boost corrosion resistance.
Popular applications include roofing and metal panel fastening, with common sizes such as 3 inch roofing screws, 1 1/2 metal roofing screws, 2 inch metal roofing screws, and 14 metal roofing screws.
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