Types of chains:

The power transmission chains are built of hardened and steel to decrease wear. These chains are categorized into three categories

(a) Block chain

(b) Roller chain

(c) Inverted tooth chain (silent chain)

Out of these three categories roller chain illustrated in Figure (b) is most commonly utilized. The construction of this kind of chain is illustrated in the figure. The roller is built of steel and then hardened to decrease the wear. A good roller chain is quitter in operation as compared to the block chain and it contains lesser wear. The block chain is illustrated in Figure (a). It is utilized for low speed drive. The inverted tooth chain is illustrated in Figures (c) and (d). It is also known as silent chain because it runs very quietly even at higher speeds.