Series JM disc coupling is a metallic flexible coupling which has representativeness. It can be adopted in various mechanical equipments. The diaphragm adopts 0.3-2mm sheet stainless steel with high strength to fabricate the assembly through riveting, on which there are 4-16 reaming holes, using bolts to connect the driving flange and the driven flange respectively. During running the diaphragm bears pulling, pressing and twisting stresses. The fabrication cost of this coupling is low, the transfer torque range is large, the mechanic property is good,mounting and dismounting are convenient, the requirement for mounting accuracy is not high, these embody the advantages of the flexible coupling. It can be widely used for various fields and is adaptable for many operating conditions, such as pump, fan, rolling mill, paper-making machinery, electric power machinery, cement machinery, shipping industry, aviation and spaceflight etc. Because its vibration-reducing property is good, the transmission is smooth, it has won common praise and adoptation, especially in the papermaking industry, it can make you produce the paper to be flatter and smoother. The quality is improved by a great margin. It can make you locate at the leading position. At the same time the product is also the optimum selection for technical transformation, replacing imported product and saving energy to reduce loss in electric generating plant, petrochemical plant, cement factory, rolling steel plant and mine etc.