
M5*100 Hex Head Washer Yellow Zinc Plated Roofing Self Drilling China Screw. Self-Drilling Design: Specialized drilling point allows installation in steel, wood, and sheet metal without pre-drilling. EPDM Rubber Washer: Provides excellent sealing and makes the screw suitable for exterior environments. Wide Grade Range: Available in grades 3.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, and 12.9 to meet various strength needs. Multiple Surface Treatments: Options include Hot Galvanized, Black, Color-Zinc, Blue White Zinc, and Dacromet. International Standards: Compliant with DIN, GB, ANSI, BSW, JIS, and GOST standards. OEM and ODM Services: Full customization available for head shapes, thread types, lengths, and materials. Fast Delivery: Standard orders ship within 15-25 days depending on complexity. ISO 9001 Certified: Manufacturing process adheres to strict quality management system standards.