BL644 leaf chain Our leaf chain meet or exceed DIN, ANSI,ISO,BS,JS standard, and stand up to the toughest work enviroment BL644 leaf chain Our BL644 leaf chain meet or exceed DIN, ANSI,ISO,BS,JS standard, and our chains stand up to the toughest working environments with years of trouble-free performance. With over 20 years of experience, Huayu can design and manufacture almost any solution for ...