What are washers used for?. A washer has multiple purposes depending on it’s’ shape, form and material. Hex Nut Serrated Flange Class 8 Zinc BZP M4 - M20. M3, M4, M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30 Washers, Form A, Zinc Plated DIN 125.
eBay