A flexible coupler with 6.35 mm (1/4 inch) bores on both sides, ideal for connecting a NEMA23 motor (or one of the rare NEMA17 motors with 6.35 mm shafts) to a 6.35 mm (1/4") shaft, for example for a shaft-based dual Y drive upgrade for a ShapeOko CNC milling machine.
Usually, flexible couplers have either a set screw, or a slit that forms two jaws that can be tightened with a screw. This coupler has both, which is an advantage. Using both mechanisms to tighten it helps keep it centered, especially when the object it tightens around is slightly smaller than the nominal diameter.
Overall dimensions: length 25 mm, diameter 20 mm (jaw tightening screws protrude slightly).
Material: aluminium alloy, steel.
Part number: EM-FC6-6.