Conveyor screws with pitch spacing equal to the diameter are considered standard and are suitable for most conveyors of conventional horizontal design.

Half pitch conveyors are recommended for inclined or vertical conveying and for materials which are very free flowing.

Flights with pitch progressively increased are used to draw fine, free flowing materials uniformly from the entire length of the feed opening.

Short pitch screws are recommended for inclines over 20 degrees slope to vertical conveying. They retard flushing of free flowing materials.

Tapering flight screws are generally recommended to draw friable lumpy materials from bins or hoppers.

Double flight produce a smooth gentle flow of certain materials are recommended for augers or post hole digging and similar applications.

Ribbon flights are excellent for sticky or gummy materials where the gap between the screw and the pipe prevents material build-up.

The screw flight periphery is notched to supplement the conveying action with a moderate mixing action.

Screw conveyors with paddles which counteract the material flow and considerably increase the mixing action.

The paddle conveyor is made of steel paddles on threaded rod shanks inserted through the pipe. Conveying action can be controlled by adjusting the paddle angle. Excellent for stirring, blending or mixing dry or fluid materials.