SC silent chains (SCA, SCR, SC)
SC silent chains use specially-coated round pins and special plates to achieve a great engagement mechanism, and might keep a noise level remarkably decrease than conventional roller chains.
SC kind silent chains could be utilized for substantial speed and large stress transmission just like a toothed metallic belt because the 
plates immediately engage together with the sprockets for driving.
SCR-04 silent chains are created with inner engaging construction for even more diminished noise degree.
PS silent chain
A PS type silent chain includes a construction during which a set of specially formed connecting pins and locker pins make contact with every other though rotating at just about every flexible bearing place. So, it generates less heat especially in substantial speed operation and it is exceptional in durability. Moreover, the specially formed pins tremendously reduce shock when the chain is engaged with sprockets, providing a greater silencing result than SC silent chains.
Sprockets
Sprockets for silent chains adopt unique modules in involute tooth varieties for the SCA 04××, SC 25××, SC 06×× over the prior webpage and PS silent chains to make sure silent high speed operation. For all sizes, the sprocket tooth heads are generally hardened by induction hardening or carburizing.