SC silent chains (SCA, SCR, SC)
SC 
silent chains use specially-coated round pins and special plates to achieve a perfect engagement mechanism, and may hold a noise level remarkably decrease than conventional roller chains.
SC type silent chains is often employed for higher velocity and huge tension transmission similar to a toothed metallic belt because the plates straight engage with all the sprockets for driving.
SCR-04 silent chains are developed with inner engaging structure for more reduced noise degree.
PS silent chain
A PS variety silent chain has a construction in which a set of specially formed connecting pins and locker pins get in touch with just about every other whilst rotating at each and every flexible bearing place. Consequently, it generates less heat specially in high velocity operation and it is excellent in durability. Additionally, the specially formed pins greatly lower shock when the chain is engaged with sprockets, offering a greater silencing result than SC silent chains.
Sprockets
Sprockets for silent chains adopt distinctive modules in involute tooth kinds for that SCA 04××, SC 25××, SC 06×× on the prior page and PS silent chains to be sure silent substantial velocity operation. For all sizes, the sprocket tooth heads usually are hardened by induction hardening or carburizing.
