This hub has a 1.000" bore, 1/4" keyway, 2.205" OD, and 0.591" length.
205", Alum,CPRDK35-16-A This double insert type has higher torque capacity than single insert styles.. The use of a keyway prevents the coupling from slipping on the shaft if over torqued. 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.