Truefit Engineering Co. Ltd. Offers Pin Bush Type Flexible Coupling. Truefit Engineering Co. Ltd. Is an ISO 9001:2000 registered company. Pin Bush Type Flexible Coupling is of the cushion type, transmitting the torque, through high tensile bolts & nuts machine input shafts. Pin Bush Type Flexible Coupling has the special rubber compounds which are used in bush material that it can absorb slight misalignment, torsional vibration & overloads. The flanges of these couplings are made of high grade cast iron. It is available in various range from 0 .81 KW to 249 KW at 100 rpm.