Shaftless Screw Conveyors as do standard screw conveyors can be manufactured in a variety of materials such as Mild Steel, Stainless Steel, and other alloys. The spiral of a shaftless conveyor is considerably thicker than a standard flight, which is required in order to maintain the spiral rigidity. They are available in single spiral as well as double spiral. Normally the outer spiral is 1" thick and the inner spiral is 3/4" thick depending on the size of the conveyor. Shaftless Conveyors are available in 9" to 24" diameter. Our experienced Sales and Engineering staff are waiting and prepared to help you with all your material handling equipment needs.