Each chain coupling is made up of a duplex roller chain and a pair of coupling sprockets with a cover that holds lubricant in place. Roller Chain couplings are used in moderate speed, high torque applications and are fairly easy to install. Chain couplings is still regarded as one of the most common used couplings in the market as it is economically effective and reliable. Shafttech distributes high quality MTM chains to over 15 countries globally.