Screw auger with small diameter

BEMA has manufactured a serie of 72 pcs. of screw auger with a small diameter – Ø41. The length of the screw augers are app. 1200 mm.

Is it possible to manufacture screw augers with sectional flights with small diamters?

• The answer is yes
• Before we say yes, we must analyze the customer drawing carefully to be sure the we are able to handle the small diameters
• The material and the material thickness is limited when you work with augers that have a small diameter
  • The material can be standard carbon steel or standard austenitic stainless steel
  • The material thickness shall be below 5 mm.

The above should be taken as a general rule of thumb. If you have a certain screw auger that you want to be manufactured in numbers contact BEMA and we will analyze if we can assist you. It might require a modified forming tool or similar prepations.

See another example of a screw auger with small diamter

Manufacturing Screw augers

Manufacturing screw rotors—especially in small diameters such as Ø41—requires a high level of precision, controlled forming processes, and a deep understanding of material behavior. When working with small diameters, the limitations of material thickness and forming tolerances become critical. As shown in the Ø41 auger series, the material thickness must typically remain below 5 mm to ensure proper forming and to avoid deformation during production. This applies whether the rotor is made from carbon steel or austenitic stainless steel.

Producing screw rotors in series also demands careful analysis of customer drawings before confirming manufacturability. Small-diameter augers often require modified forming tools or custom preparations to achieve the correct pitch, flight geometry, and structural stability. This ensures that each rotor maintains consistent quality across all units in the batch.

In addition to forming, the manufacturing process includes welding, straightening, balancing, and final machining of shaft ends or interfaces. These steps are essential to ensure smooth rotation, minimal vibration, and long-term durability in the customer’s application. For OEM customers, repeatability is especially important, as the screw rotor must integrate seamlessly into a standardized machine design.

Material selection also plays a major role in performance. Stainless steel is often chosen for its corrosion resistance and suitability for food, chemical, or wet environments, while carbon steel may be preferred for dry bulk handling or cost‑sensitive applications. Regardless of material, the rotor must be engineered to withstand the mechanical loads, abrasion, and operational stresses of the intended process.

This combination of engineering analysis, material expertise, and controlled production methods is what enables reliable manufacturing of screw rotors—even in challenging dimensions such as Ø41—and ensures that each auger performs consistently in demanding industrial environments.

FAQ for Screw Augers with Small Diameter Ø41

1. Can screw augers with very small diameters be manufactured?

Yes. Small‑diameter augers such as Ø41 can be produced, but only after a detailed review of the customer’s drawing to confirm that the geometry, tolerances, and material thickness are feasible for forming and welding.

2. What material limitations apply when producing small‑diameter augers?

Both carbon steel and austenitic stainless steel can be used, but the material thickness must remain below 5 mm to ensure proper forming and to avoid deformation during production.

3. Why might special tooling be required for small‑diameter screw augers?

Small diameters often demand modified forming tools or additional preparation steps to achieve the correct pitch and flight geometry. This ensures consistent quality across all units in a production series.

4. How does BEMA ensure manufacturability for series production?

Before committing to production, BEMA analyzes the specific auger design to confirm that it can be manufactured in numbers with stable quality. This includes evaluating material choice, thickness, forming method, and any need for custom tooling.