Hanging ductwork, equipment, wiring trays or other building components requires secure structural assemblies. These assemblies are comprised of support members attached to building anchor points with fasteners. The support members are often lengths of strut or angle iron. The fastener frequently is threaded rod combined with washers and nuts. Duro Dyne stocks Zinc plated threaded rod in five diameters and in lengths of 6 feet, 10 feet and 12 feet. The rod is shipped in sturdy cardboard tubes.