oil seal: 1.195-27-00022,150-27-00025,20Y-30-00100,287-33-00010,154-30-00831,170-27-00111,21T-30-00110 2.ISO9001:2000 oil seal: Oil seal used in construction machinery and mining machinery , the outer diameter is from 50mm-1,000mm. The material is chrome molybdenom casting iron. The hardness is HRC58-62 , the working face precision within 0.015um , flatness up to 0.1um-0.2um ,the lifetime is more ...