self drilling roofing screw , Iran

The self-drilling roofing screw from Iran is specifically designed for joining metal sheets without any pre-drilled pilot hole. Its drill point consists of four main sections: the Point, Pilot section, and Flute for efficient chip evacuation. The coarse thread pitch is engineered to maximize installation speed and reduce assembly time. Common nominal diameters for these fasteners include M4.2, M4.8, M5.5, and M6.3 millimeters. The total length of these screws varies between 13 and 127 millimeters depending on the total metal sheet thickness.

These self-drilling roofing screws from Iran are manufactured in three primary material categories with distinct mechanical properties. Low carbon steel grades 4.6 and 5.6 offer tensile strength below 500 Newtons per square millimeter. Hardened steel grade 8.8 undergoes heat treatment to achieve 800 Newtons per square millimeter tensile strength. Stainless steel grade 316 contains 16 to 18 percent chromium and 8 to 10 percent nickel for excellent corrosion resistance. An attached rubber washer provides watertight sealing to prevent rainwater infiltration through the drilled hole.

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