This hub has a 11mm bore, 25.0mm OD, and 9.5mm length.
CntrlFlx Cplng Hub, Double, Bore 11mm, OD25. 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. The use of two inserts allows for higher torque capacity than single insert styles.0mm, Aluminum,MCPRD25-11-A It is longer than equivalent single insert Controlflex types to couple systems with wide distances between shaft ends.