The construction of a Control‑Flex Coupling consists of two hubs (to be attached to the shafts) and a center flex member. This flexible element is affixed to the hubs through pins. Clamp‑style hubs provide a positive shaft connection. Special modifications are available upon request. The clamp‑style Control‑Flex Couplings are available with a single flex disc for standard torque capacity, or with two flex discs for increased torque capacity and torsional stiffness. The clamp‑style hub models come standard without keyways. Keyways are available upon request.