This hub has a 18mm bore, 6mm keyway, 56.0mm OD, and 15.0mm length.
This keyed clamp style single insert type hub requires the user to mate it with one other hub and one acetal insert. Ruland supplied Controlflex couplings are a lightweight, low inertia, and zero-backlash coupling designed for use in encoders, tachometers, resolvers, and light duty power transmission applications..This Controlflex hub is RoHS and REACH compliant and manufactured by Schmidt Kupplung in Germany.