These flexible couplers are ideal for attaching an 8mm threaded rod to standard NEMA 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 / 5mm Precision machined aluminum Length: 25mm Diameter: 20mm Nominal torque: 1.5Nm Maximum torque: 3N.m
