... molybdenum cast iron Lifetime: over 4500 hours hrdness:HRC65-72 duo cone(floating)seal The material of the floating seals is ... precision within 0.015um, flatness up to 0.1um-0.2 um; the lifetime is more than 4500 hours.Our floating ... bulldozer such as SHANTUI, SHANGHAI, YELLOU RIVER, YISHAN AND QINGGONG;2. Japan bulldozer (KOMATSU): D50, D60, D80, D85, D155, D355; American ...