This standard stipulates the types, basic parameters and main dimensions of LX and LXZ elastic pin couplings (hereinafter referred to as couplings), and provides technical requirements, inspection rules, signs, packaging and storage. This standard is applicable to the transmission shaft system connecting two coaxial shafts, and has the performance of compensating the relative offset of the two shafts and general vibration reduction. The working temperature is 20℃~+70℃, and the transmission nominal torque is 250 N·m~180 000 N·m.