Three Roll-Non-Parallel Expanding-Flare Roll Type — 2″ to 3″ Outer Diameter
The Series 28 Expanders simultaneously flare the tube as a preliminary to beading operations. The revolving thrust collar sets the tube and is notched to clear adjacent tubes if on close centers. It works well in most HRT and other fire tube boilers. These Expanders are also popular for far end rolling when used in conjunction with reverse mandrels and extension drives. The expander range is taken at the front of the thrust collar.