These flexible couplers are ideal for attaching an 8 mm threaded rod or lead screw to standard NEMA 17 stepper motors. They have two grub screws per shaft, so they adhere well and do not slip! Flexible couplers are perfect because they allow slight misalignments in the coupled shafts. So even if your RepRap is not perfectly aligned, these couplers will leave you a little play! Specifications Bore size: 5mm / 8mm Precision machined aluminum Length: 25mm Diameter: 20mm Nominal torque: 1.5Nm Maximum torque: 3N.m
