HRC Flexible Chain Coupling. 1).Compents:coupling,two casing sprockets,Double standard roller chain. 2).ISO9001 Quality system HRC Flexible Chain Coupling.Features:1).Compents:coupling,two casing sprockets,Double standard roller chain.2).ISO9001 Quality system3).Excellent and high quality control,advanced producing equipment.4):Type:kc3012,4012,4014,4016,5014,5016,5018, 6018,6020,6022,8018,8020, ...