
Durable Full Thread Hex Washer Screws for Metal Roofing Projects. Self-Drilling Tip: Features a self-drilling tip for quick and secure installation on metal roofing and siding. Corrosion Resistance: Electro-galvanized finish combined with EPDM washer ensures durability in tough environments. Wide Grade Range: Available in grades 3.6 to 12.9 to meet diverse strength requirements. Customization Support: Offers tailored solutions for unique head shapes, thread types, lengths, and materials. International Standards: Manufactured to comply with GB, ANSI, DIN, JIS, BSW, and other global standards. Strict Quality Control: 100% QC checks for dimensional accuracy, torque resistance, and corrosion resistance. Flexible MOQ: Standard MOQ starts from 100,000 pieces, with lower options for bulk or special cases. 24/7 Support: Dedicated team available around the clock to resolve customer issues.