This standard stipulates the classification, type and parameters, technical requirements, test methods, inspection rules, signs, packaging and storage of LT and LTZ elastic sleeve pin couplings (hereinafter referred to as couplings). This standard is applicable to the transmission shaft system connecting two coaxial shafts. It has a certain compensation for the relative offset of the two shafts and general vibration reduction performance. The working temperature is -20 ° C ~ +70 ° C; m.