These are flexible shaft couplings – particularly useful for joining motors to Z-axis threaded rods or lead screws. It will help reduce or eliminate the dreaded Z-Wobble that plagues many machines.
Each unit come with four M3 grub screws – 2 for each shaft, for the best concentricity and grip.
These 5mm – 8mm couplers are great for joining motor shafts to M8 threaded rod, or to certain lead screws that have a turned down 8mm portion on them.
Height of the coupler is 25mm