Outboard Roller Chain with Top Rollers (Top Roller Chain) is often used on accumulating free flow conveyors. Top Roller Chain is based on the standard chain with extended side plates (SK-1 attachments). Top rollers are installed on the pins that connect SK-1 extended plates. Top Roller chains are available with steel or engineered plastic top rollers on every link or every 2nd link. Pallets with conveyed objects are loaded on the top rollers.
There are three types of base chain:
(1) Double pitch roller chain with standard rollers (straight side plates, small rollers).
(2) Double pitch roller chain with oversize rollers (straight side plates, oversized rollers).
(3) RS-type (figure-eight side plates, small rollers; oversized rollers are not available).