CNC OD44mm L50mm Bore 12mm 12.7mm 14mm 15mm 16mm 18mm 19mm 20mm 22mm servo stepper motor double Diaphragm flexible shaft Coupler  new flexible aluminum alloys double diaphragm coupling for servo and stepper motor couplings d 44 l 50 d1 and d2 are 8 to 20 mm
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