Flanges provide a simple means of mounting Cooper split roller bearings against a vertical or horizontal face or bulkhead. The most common types of flange are the round flange. Standard round flanges are made from Grey iron and ductile iron . Alternative materials and designs are available. Flanges are common between expansion (EX) and fixed (GR) units. The bulkhead or support plate on which the flange is mounted must be of adequate strength and rigidity to support the imposed load with little distortion of the flange mounting area. This listing is for a flange only.