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Gear coupling, a mechanical device designed with a flexible joint, is fixed to each sha. This transmits the torque between two non collinear shas. Having higher torque densies than universal joints, this is designed to be fied a given space whereas universal joints induce lower vibraons. The completely flexible gear coupling consists two hubs , one is with an external gear and other with an internal gear. Gear couplings find their applicaons in rolling mill machinery and other industrial machines.