This hub has a 6mm bore, 37.0mm OD, and 7.0mm length.
0mm, Aluminum,MCPTS37-6-A It has a balanced design and can accommodate speeds of up to 15000 RPM. 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.