This hub has a 0.313" bore, 0.748" OD, and 0.220" length.
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.748", Aluminum It is longer than equivalent single insert Controlflex types to couple systems with wide distances between shaft ends. This clamp style double insert type hub requires the user to mate it with one other hub and two acetal inserts.