Right Hand Versus Left Hand Screws

Determining the difference between a right and left hand screw for a screw conveyor can be difficult. In this video, KWS makes it easy to identify both right and left hand screws.
Also, direction of bulk material flow can be determined by the hand of the screw and direction of rotation.

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Thanks for the handy info. What are the selection criteria for a right and left hand screw. In my work place there are 4 conveyors, 2 are right handed and 2 are left handed.