Shaftless screw rotor in carbon steel

Shaftless screw rotor in carbon steel manufactured as a spare part.

Main dimensions

• Heavy duty shaftless rotor
• Material: EN 1.0570 Cabon steel
• Diameter Ø365, Length 6690mm, screw flight thickness 25mm

Where to use a shaftless screw rotor?

A shaftless screw rotor refers to a type of rotor design where the central shaft is absent. Instead of having a traditional shaft running through the center, a shaftless rotor operates without this central support.

This gives some clear benefits while operating with material that could be viscous or very sticky.

Shaftless screw rotors are very commonly used in wastewater treatment plants or similar to transport:

• Sludge
• Mud
• Other forms for sticky solids

The absence of a central shaft reduces the risk of clogging and allows a smooth and continuous flow of material.  Shaftless screw rotors are commonly seen in the food industries, used for transportation of e.g., powder, chemicals or different ingredients, in a gentle and minimum risky cluttering way.

How can BEMA assist you as a customer?

BEMA manufacture many shaftless screw rotors to a huge variety of customers and industries. Please feel free to contact us, so we can help you find your next solution for your operations. You are always welcome to learn more, by following this link here:

Learn more about screw rotors from BEMA

FAQ – Shaftless screw rotor for sticky material

What is a shaftless screw rotor used for?

A shaftless screw rotor is designed for transporting viscous, sticky or clog‑prone materials, where a traditional shaft would obstruct flow. It is widely used in wastewater treatment for sludge, mud and other dense solids, and in food and chemical industries for powders and ingredients.

Why choose a shaftless design instead of a traditional screw rotor?

The absence of a central shaft reduces the risk of clogging and material buildup, allowing smoother, continuous flow. This makes the design ideal for challenging materials that require gentle handling and minimal blockage risk.

What materials and dimensions can BEMA supply?

BEMA manufactures heavy‑duty shaftless screw rotors in various sizes and materials, including carbon steel such as EN 1.0570. The example shown features Ø365 mm, 6690 mm length and 25 mm flight thickness, but rotors can be tailored to customer requirements.

How can BEMA support customers needing shaftless screw rotors?

BEMA produces shaftless rotors for a wide range of industries and applications, offering guidance to help customers identify the right rotor for their process. The team assists from specification to delivery to ensure optimal performance in operation.