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MJCC4120A Jaw Coupling. Ruland MJCC4120A is a clamp zerobacklash jaw coupling hub with a 20mm bore, 6mm keyway, OD, and length. It is a component in a threepiece design consisiting of two aluminum hubs and an elastomeric insert called the spider creating a lightweight low inertia coupling capable of speeds up to 8,000 RPM.