Series DC Drum coupling is a type of flexible gear coupling. The couplings are especially recommended for installation in drum drives of cranes. It is also suitable for similar mechanical equipments that transmit toque and bear radial load. However, the couplings can not bear axial load.The characteristics: Capability of high torque, high radial load and compensation of axial deviation. The couplings can be used for ordinary reducer. The couplings have many virtues, such as compact structure, convenient assemble and disassemble, supplying abrasion indicator and high reliability. It is particularly suitable for the hoisting gear of lifting equipment.