Side bow (side flexing) chains are capable of running on curves. They are
constructed of ANSI standard roller links with special diameter pins to
provide extra clearance between the pin and the bushing for side
flexing and twisting for curved conveyor applications, which include roll
conveyors. Side bow chains are also used in power transmission drives
where an abnormal chain twist or sprocket misaligment may take place.
The attachments for side bow chains are usually available only for inner
links and have the same dimensions of the utilized for ANSI standard
roller chains. Regina manufactures some attachments for outer links (see table).