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MJCC41-20-A Jaw Coupling. Ruland MJCC41-20-A is a clamp zero-backlash jaw coupling hub with a 20mm bore, 6mm keyway, 41.3mm OD, and 18.0mm length. It is a component in a three-piece 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.
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