Diamond’s oval contour roller chains feature a different link plate from Diamond’s standard ANSI series chain. Unlike Diamond’s standard figure-eight-style link plate, the oval contour plates take their name from their oval shape. Oval contour roller chain is designed for high load applications. These chains are manufactured using a medium carbon alloy steel that is through-hardened to deliver a higher working load capacity. In addition, the rigidity of the link plates is ideal for high load applications that may cause fatigue failures.