Screw flight

Variable-Pitch Screw Flight

Name: Variable-Pitch Screw Flight
Brand: SpiralFlights

Custom variable-pitch screw flight made to a pitch schedule, flight geometry, material and finished assembly drawing.

Engineering fit

Built around the dimensions, material and production target that matter

Flighting in which the axial pitch changes along the screw according to an approved schedule rather than remaining constant from end to end.

Use the stated range as a practical starting point. We confirm the final configuration against your drawing, material and operating conditions.

Discuss this product

Variable-pitch helical flight profiles with changing turn spacing

Typical uses

Metered material feeding
Grain handling
Port and bulk-material equipment
Mining and conveying assemblies

Product data

Product Specifications

Parameter	Specification
Pitch schedule	State every pitch value, transition position and number of turns
Flight geometry	Confirm outside diameter, inside diameter or shaft fit, thickness and hand
Construction	Continuous or sectional route selected after drawing review
Material	Carbon steel is supported by the available product record; other grades require confirmation
Supply condition	Loose flighting, matched sections or an assembly defined by the drawing

Workshop reference

Product and process views

Formed screw flights prepared for variable-pitch conveyor assemblies

Variable-pitch screw flight for custom auger and conveyor applications

Custom variable-pitch screw flight with changing helix spacing

Variable-pitch auger flight manufactured for material conveying equipment

Steel variable-pitch screw flight for conveyor screw assembly

Variable-pitch spiral flight designed for controlled material flow

Custom screw flight with variable pitch for industrial auger systems

What it is

A variable-pitch screw flight changes the distance between consecutive turns along its working length. The change may be stepped or progressive. This geometry is used when material needs to be introduced, spread, compressed or released differently from one section of the screw to another.

Pitch schedule controls the product

The product cannot be defined by one pitch dimension. The drawing should show the starting pitch, every intermediate value, the final pitch, the number of turns in each zone and the axial location of each change. Outside diameter, inside diameter or shaft fit, thickness and hand must be tied to the same datum.

Manufacturing and assembly route

The available manufacturing route depends on the section and pitch schedule. A continuous route may suit some profiles, while sectional forming and controlled assembly may be more practical for larger or more complex changes. Final joints, shaft attachment and overall straightness are reviewed as part of the assembly drawing.

Where it is considered

Variable pitch is commonly reviewed for feeding and bulk-material duties, including grain handling, port logistics, mining and general conveying equipment. Suitability depends on the material behaviour and the machine design; the flight alone does not determine capacity.

When to choose this option

Use this page when the pitch must change along the screw. For one repeated pitch, start with cold-rolled continuous screw flight or sectional spiral blade. For a complete screw on a centre member, review the shafted auger assembly.

Quote checklist

Drawing with the complete pitch schedule and transition positions
Outside diameter, inside diameter or shaft diameter, and thickness
Right- or left-hand rotation
Material grade and incoming material condition
Total flighted length and required end connections
Continuous, sectional or complete-assembly supply preference
Trough or tube clearance and operating orientation
Conveyed material, duty and quantity

Before quotation

Frequently asked questions

Use these answers as a starting point. Final geometry, material and equipment scope are confirmed from the project information.

How should a variable pitch be shown on the drawing?

List each pitch value, the number of turns at that value and the axial position of every transition. A dimensioned side view is preferred to a general note such as progressive pitch.

Can both diameter and pitch change on the same flight?

The combination can be reviewed, but it needs a complete station-by-station geometry schedule. The manufacturing route and joining plan are confirmed after the drawing is checked.

Is variable-pitch flighting always supplied as one continuous length?

No. It may be planned as continuous flighting, individual segments or an assembled screw, depending on diameter, thickness, material and total length.

What information is needed to check clearance?

Provide the trough or tube inside diameter, shaft or centre member, required running clearance and the installed position of bearings or supports.