... wear resistant material for thrust bearing.Preventing reflux structure has dual function, it can avoid air counterflow and dust entering into ... TypeIn.mm6152.4517G, 537G, 617G, 637G6 1/2165.1517G, 537G7 7/8200.0517G, 527G, 547G, 617G, 627G, 637G8 1/2215.9437G ... , 537G, 547G, 617G9 5/8244.5437G, 517G, 537G, 547G, 617G9 7/8250.8437G, 517G, 537G, 547G, 617G12 1/4311.1437G, 517G ...