Robust shaftless screw conveyors

Robust shaftless screw conveyors with basalt insertion

For conveyors intended for the transport of very abrasive materials (slag, glass, bed ash, fly ash, aggregates, sand, corundum, etc.) into steel or steel. RATAJ® stainless steel spiral conveyors (Types RLERLNE) are fitted with basalt inserts. The thickness of these inserts is 20 mm and they are supplied "tailor-made" according to a specific design of the conveyor in the form of a trough or pipe. The temperature resistance of the basalt inserts is up to about 400 °C.

In some cases it is possible to operate these conveyors for a short period of time without the conveyed material, further to convey materials that are easily compacted to form glued and hard crusts. plastic inserts easily removed.



  • for transporting extremely abrasive materials
  • no-load option
  • very long pipe life (up to 20 times higher than alloyed steels)
  • can be used up to 400 °C

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)
  • stainless steel (according to ASTM - AISI 304, AISI 316, AISI 321)


  • insert material: basalt
  • insert thickness: 20 mm
  • temperature resistance of basalt inserts: approx. 400 °C
  • supplied "tailored" in the form of a trough or pipe

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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