The 843 chain is designed with overlapping plastic flights assembled on a special roller chain with extended pins.This is an advantage especially at high speeds, because it reduces the noise level. The Snap-On chains are very suitable for the food processing industry. The 843 chain has a 0.50 in. pitch roller base chain and the plastic flights can be supplied in widths from 25.4 mm (1.00 in.) to 82.6 mm (3.25 in.).