... journal bearing)Aircooled bearing typeapplicationPetroleum and gas, water well, mining and tectonic industries, oil field, construction, geothermal, ... life-employing new sinter technics firms the bonding of diamond particles. The abrasion resistance has a vast increase ... basic cylindrical cutters to inserts with customized angles, diamond thickness, chamfers, and sizes.Hejian Wanda Petroleum Machinery ...