This hub has a 10mm bore, 3mm keyway, 37.0mm OD, and 10.0mm 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. CntrlFlx Cplng Hub w/Key, Dbl,Bore 10mm, OD37. This double insert type has higher torque capacity than single insert styles..