... FCL coupling,HRC coupling,chain couplings,jaw couplings,nylon teeth couplings,NM couplings Material :steel,cast iron, ... parts. coupling:FCL couplings,chain couplings,HRC couplings,NM couplings.MH couplings,Jaw couplings,GE couplings,Nylon teeth couplings. simple construction,safety and ... components , such as sprockets, gears, chain couplings, shafts, couplings ,pulleys, timing belt pulley,and so on ...