Each coupling has 4 Grub screws fitted to tight the coupling on shaft / rod. STAINLESS STEEL RIGID SHAFT COUPLING. THESESTAINLESS STEEL RIGID SHAFT COUPLING ARE USED IN VARIETY OF APPLICATIONS SUCH AS CNC, 3D PRINTER AND VARIETY OF OTHER APPLICATION TO MOUNT STEPPER MOTOR TO ONE END AND SHAFT OR LEAD SCREW TO THE OTHER END.
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