This standard specifies the type, basic parameters and main dimensions of radial elastic pin couplings, technical requirements, inspection rules and markings, packaging, storage, etc. The coupling specified in this standard is suitable for connecting two coaxial transmission shafts. It has certain radial, axial and angular displacement compensation and shock absorption and buffering properties. The operating temperature is -35~+80℃. The nominal transmission torque is 1250~355000 N·m.