... characteristics exactly the same,(6) free maintenance, resisting oil and corrosion resistance,(7) Aluminum alloy and stainless steel ... top silk and clamping two kinds.2. The plum flower coupling(1) Compact, toothless gap, provide three different ... structure, convenient maintenance, facilitating examination,(4) Free maintenance, resisting oil and electrical insulation, working temperature 20 °C - 60 °C ...