High Grade Bi-Metal Hex Washer Head Self Drilling Screws with Washers

High Grade Bi-Metal Hex Washer Head Self Drilling Screws with Washers. Bi-Metal Construction: Carbon steel core with stainless steel exterior for strength and corrosion resistance. Customized Surface Treatment: Options include Zinc Plated, Ruspert, Dacromet, and other customized coatings. Wide Size Range: Diameter 2.9mm-10mm and length up to 400mm, with non-standard sizes available. Ideal for Solar Applications: Perfect for securing rails, brackets, and frames in solar power systems and roofing. High Torque Resistance: Heat-treated for toughness, resisting stripping and breaking under high torque. Multiple Coating Standards: Class 2, 3, and 4 options with salt spray resistance up to 2000 hours. Full Customization Support: Accepts ODM/OEM, flexible customization from designs or samples. Multiple Certifications: ISO9001, BSCI, and compliance with ANSI, DIN, GB, GOST, JIS standards.