The 1/2″ x 1/2″ Steel (Black Oxide) Set Screw Coupling with Keyway is a simple and economical rigid coupling designed to connect two shafts for reliable torque transmission. Precision-machined from black oxide steel, it uses set screws to secure the coupling directly to the shaft surfaces, providing a cost-effective solution where frequent adjustment is not required. The integrated keyways provide added torque capacity and fixed shaft phasing, while an additional set of screws can significantly increase load capacity.