Basic Conveyor Flight and Pitch Types
Standard Pitch, Single Flight
Standard pitch, single flight screws have the outside diameter equal to the pitch and are the most common screw type used for horizontal screw conveyors and inclines up to 10-degrees. |
Variable Pitch, Single Flight
Variable pitch, single flight screws have increasing pitch with every flight and are used in screw feeders to provide uniform withdrawal of free-flowing bulk materials from hoppers, bins or silos. |
Short Pitch, Single Flight
Short pitch, single flight screws have the pitch reduced to 2/3 of the diameter and are most commonly used in inclined and vertical screw conveyor applications. Short pitch is also used in some variable pitch screw feeder applications. |
Standard Pitch, Double Flight
Standard pitch, double flight screws have the outside diameter equal to the pitch, very similar to standard pitch, single flight. A second set of flights is added 180-degrees apart from the first set of flights to provide a more even discharge of bulk materials. |
Half Pitch, Single Flight
Half pitch, single flight screws have the pitch reduced to 1/2 of the diameter and are commonly used in inclined and vertical screw conveyor applications. 1/2 pitch is also used in some variable pitch screw feeder applications. |
Standard Pitch, Tapered Single Flight
Standard pitch, single tapered flight screws have a tapered outside diameter increasing from 1/2 to full diameter and are used in screw feeders to provide uniform withdrawal of free-flowing bulk materials from hoppers, bins or silos. |
Standard Pitch, Single Ribbon Flight
Standard pitch, single ribbon flight screws have a space within the flight and around the center pipe to minimize the collection and buildup of viscous and sticky bulk materials. |
Standard Pitch, Single Flight with Paddles
Standard pitch, single flight with paddles screws have adjustable paddles located between screw flights. Up to four paddles per pitch can be added for gentle and thorough mixing of bulk materials. |
Standard Pitch, Single Cut Flight
Standard pitch, single cut flight screws are notched at regular intervals on the outer edge to promote mixing and agitation of bulk materials. |
Standard Pitch, Paddle
Standard pitch, paddle screws have adjustable paddles located in a helix around the diameter of the center pipe. Up to four paddles per pitch can be used for aggressive mixing and controlled flow of bulk materials. |
Standard Pitch, Single Cut and Folded Flight
Standard pitch, single cut and folded flight screws are notched at regular intervals on the outer edge and have lifting paddles to promote aggressive mixing and agitation of bulk materials. |
Mass Flow
Mass flow screws utilize a combination of internal cone and variable pitch to provide increasing volume with every flight and are used in screw feeders to provide uniform withdrawal of bulk materials from hoppers, bins or silos. |
Screw Conveyor Screws Conveyor Screws: Helicoid vs. Sectional
