This hub has a 1.125" bore, 2.953" OD, and 0.709" length.
This Controlflex hub is RoHS and REACH compliant and manufactured by Schmidt Kupplung in Germany. It has a balanced design and can accommodate speeds of up to 7500 RPM.125", OD 2. 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.