Robust shaftless screw conveyors

Spiral conveyors with alloy insert RATABEN®

For conveyors designed to transport extremely abrasive and hard materials (fly ash, glass, corundum, grinding, crushed basalt, blasting material, etc.), RATABEN® wear-resistant alloy inserts are placed in the steel piping of RATAJ® spiral conveyors (Type RLV). The production of alloy inserts is made to measure for individual diameters and it is also possible to produce straight alloy inserts, which we use for unloading flat surfaces of tanks and hoppers.

In some cases, these conveyors can be operated for a short period of time without the material being conveyed, materials that are easily compacted to form glued and hard crusts, and, last but not least, requiring complete cleaning of the conveyor piping.

Conveyor made from


  • Type RL - steel (according to EN - S235, S355)
  • Type RLN - stainless steel (according to ASTM - AISI 304, AISI 310, AISI 316)


  • steel (according to EN - S235, S355)

The diameter of the conveyor piping depends on the type of material, for almost any type it is possible to choose from several variants. The maximum length of the conveyor is essentially unlimited.

More than 5 900 units of conveyors for nearly 600 kinds of materials in 34 years of market experience guarantee professionalism even for your demand.

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