Shaftless Screw Conveyors

The unique features of the SPIRAC Shaftless Screw Conveying Systems present new possibilities when designing materials handling systems.

Download the Shaftless Conveyor Product Brochure

  • Low rpm for long life expectancy from minimal wear of components = virtually maintenance free
  • Low power usage = energy savings 
  • Less wear = less down time
  • Space saving
  • Handling of large objects, up to trough diameter
  • Fully sealed lids, gasketed joins for tight odor and mess containment

A system of SPIRAC horizontal, inclined and vertical shaftless screw conveyors with no intermediate or end bearings, low rpm’s and low power usage is a space-saving, extremely reliable conveying option. 

Maintenance is significantly reduced when compared to traditional conveying methods. The elimination of a central shaft allows a much higher fill rate resulting in lower rpm’s; more efficient conveying and consequently less wear and power usage.

Shaftless screw conveyor

The shaftless spiral allows higher filling rates and lower rpm’s resulting in less wear and consequently less maintenance and down time. Although the spirals can be made of many different materials, the primary material is HTMAS (High Tensile Mircoalloyed Steel) - a special steel from Sweden with mechanical properties that result in the SPIRAC spiral having a very high tensile strength.

No intermediate or end bearings

Eliminating intermediate and end bearings reduces major maintenance work. It also allows efficient and direct transfer into another conveyor – horizontal, inclined or vertical.


SPIRAC’s proprietary liner, DURAFLO® Type SPX, has been designed specifically to ensure low wear and long life. A combination of material thickness and formulation gives Duraflo Type SPX its unique wearing characteristics.  DURAFLO® Type SPX has been developed over many years and is one of the key features which ensures that SPIRAC conveyors are industry leading.  The DURAFLO® Type SPX liner also has a built-in wear indicator with a snap-in, snap-out feature enabling easy replacement.

Totally enclosed troughs

SPIRAC shaftless screw conveyors are totally enclosed with elastomeric seals and gaskets. There is no spillage of the material being conveyed and odours are completely contained.

Direct drive

SPIRAC’s direct-drive design allows a clean and efficient transmission without the maintenance required with belt and chain drives.