Shaftless Screw (Spiral)

S2S Industries

We manufacture shaftless spirals for the industry standards, as well as custom designed spirals. Our machines are capable of rolling the thickest and tightest flights. We will be able to supply shaftless spirals for your new projects, or as replacements parts for existing shaftless screw conveyors, sludge conveyors, screw feeders, screw presses, inclined shaftless screw conveyors, vertical shaftless screw conveyors or any other equipment using shaftless screws.

To get a quick history of the shaftless screw conveyor, you can read our article Origin of the Shaftless screw.

Shaftless spirals are normally used to convey sticky materials in centreless screw conveyors. The spiral lays on liners and is driven at one end by a gear box. A shaftless spiral will allow the movement of more materials than a shafted of the same size.

As there is no shaft or hanger bearings, the material runs free without the problems of sticking to, or wrapping around the shaft. The shaftless conveyor can be up to 90 meters and can run in either direction. Vertical, Inclined, Horizontal, Pushing, Pulling, are being used in all kinds of applications: municipal waste, sludge screw, sand screw, screenings, pulp and paper, breweries, and many others. With a wear liner of UHMW giving smooth running, little or no noise, making for a quiet safe working environment.

Right hand / Left hand, push or pullYour spiral can either be a right hand or a left hand.

Your spiral can be pushing, pulling or both, A pushing spiral is conveying material away from the gear box. A pulling spiral is conveying material toward the gear box.

When ordering a spiral, we need to know if your spiral is a 'Right hand (RH) pushing', 'RH pulling', 'LH pushing' or 'LH pulling'.MaterialThe material for your spiral can be stainless steel (300 series and duplex), Mild steel (coated, plated or not), harder steel, or any special request (including Swedish steel) (all special request proposed by our clients are evaluated on the specific needs of the client).

LengthThe total length for the shaftless spiral can be given to S2S Industries. We deliver 'per section' of 4 meters on average (to be welded or bolted together by the client.) We can possibly deliver in smaller sections (more welds for the client) or longer sections upon special inquiries.

Single fligths

A single flight spiral is characterized with the following dimensions:

Multiple flightsA double (or multiple) flight is characterized with the following dimensions:

Coupling discsYour spiral is coupled to the drive shaft with a coupling disc (or End plate.) S2S Industries always includes 'torsion bars' at the connection between the spiral and the coupling disc. A coupling disc is characterized with the following dimensions:

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