This hub has a 20mm bore, 56.0mm OD, and 15.0mm length.
This clamp style single insert type hub requires the user to mate it with one other hub and one acetal insert.0mm, Aluminum,MCPRS56-20-A It is compact and can fit in smaller envelopes than equivalent single beam or double insert Controlflex styles. CntrlFlx Cplng Hub, Single, Bore 20mm, OD56. It has a balanced design and can accommodate speeds of up to 10000 RPM.