Screw Flight Dimensions

The four dimensions that start a screw flight review

Outside diameter, inside diameter, pitch and thickness describe different parts of the flight geometry. They must be recorded together. A single diameter or a product photograph does not define a replacement flight, finished assembly or suitable manufacturing route.

The same inputs are used for screw flight and auger flight enquiries. The product name may change with the industry, but the drawing still needs clear dimensions, hand, length, material and connection details.

Outside diameter (OD)

OD is the overall diameter across the outside edges of the flight. Record whether the value comes from an approved drawing, a new sample or a worn part. If the flight must run inside a tube or housing, include the mating dimensions and required clearance as separate project information rather than assuming them from OD.

Inside diameter (ID)

ID describes the opening at the inner edge of the flight. It is not automatically the same as the shaft or tube outside diameter. Show the intended fit, weld position or other connection to the centre member so the inner geometry is not reviewed in isolation.

Pitch

Pitch is the axial distance from a point on one turn of the flight to the corresponding point on the next turn. State the hand and identify where the pitch is measured. For a variable-pitch product, provide the complete pitch schedule and transition positions rather than one average or nominal value.

Thickness

Thickness identifies the material section used for the flight. Record the specified value, material grade and whether the measurement comes from a drawing or an existing sample. A photograph is not reliable evidence of thickness, and this guide does not set a manufacturing limit or tolerance.

Put the dimensions in drawing context

Add hand, finished length, quantity and material to OD, ID, pitch and thickness. Show the shaft or tube interface, joints, weld preparation, segment count or end connections when they are part of the required supply.

For a worn replacement part, include photographs and label which values are field measurements. For a new design, identify the drawing revision and which dimensions are still provisional. This keeps estimated values separate from the geometry that will control quotation and production review.

Use the dimensions for the right next step

This page defines the main geometry fields. Use the quotation request guide for the complete buyer submission package. Use the screw flight selection guide to compare cold-rolled, mould-wound and sectional manufacturing routes.

The current product records provide route-specific context:

• Cold-rolled continuous screw flight for continuous cold-formed strip flighting
• Sectional spiral blade for individual segments, larger or heavier geometry and joining requirements
• Continuous constant-thickness auger flight for the mould-wound route
• Variable-pitch screw flight when a full pitch schedule is part of the drawing

Information to provide with the dimensions

• OD, ID, pitch, thickness, hand and finished length
• Material grade and any stated surface, wear or corrosion requirement
• Quantity and required supply form: loose flighting, segments or an assembly
• Shaft, tube, joint, weld or end-interface details
• Application and operating environment
• Approved drawing, sketch or sample photographs, with measured and provisional values labelled clearly

This information supports an initial review. Final tolerances, material suitability and manufacturing limits are confirmed only against the complete drawing and agreed product specification.