This standard specifies the type, basic parameters, main dimensions, technical requirements, test methods, inspection rules, marking, packaging and storage of LX, LXD, LXS, LXZ, LXP, LXT, LXJ and LXQ star elastic couplings. This standard is applicable to couplings connecting two coaxial transmission shaft systems, and has certain compensation and vibration damping performance for the relative offset of the two axes. Transmission torque 20N.m~25000N.m, environment -35℃~+80℃.