The company is specialized in producing and exporting NFE-25511 French standard single-sided embossed butterfly lock washer M4-M20 specifications series products for standard locomotives, grounding butterfly lock washers. Main materials are 65 manganese steel, SK5, 304 and 316 stainless steel; the products are produced in strict accordance with German standard technology. We have established a long-term relationship with many foreign trade companies, over 80% products are exported to Germany, Italy and other European countries and regions. Common specifications M4-M20 are kept in stock; provide custom-made and prompt delivery! Welcome to call us!