Useful in transportation of granular, pulverized & less frequently various small size lumpy bulk materials.For comparatively short distance usually up to 40 m horizontally or to height up to 30 m Widely used in different industries like chemical, building materials & floor industries. Efficient to move semi solid materials. Having greater pitch & comparatively higher capacity with out increase in rotation speed. Screw conveyors are used to convey bulk material from almost any position (vertical, horizontal, or at an incline) and are one of the most reliable methods of conveyance. The screw conveyor is composed of a pipe with a welded steel strip that is formed into a continuous helix. The helix is referred to as the flighting