Precision steel tube for roller shaft systems.
Perfect fit and silent rotation. Inner precision and mechanical strength.
A steel tube acting as the axle of an industrial wheel, a hospital trolley or a conveyor roller cannot have dimensional mismatch or a 0.5 mm internal weld bead. That bead — invisible to the naked eye — is precisely the cause of the squeaking, vibration and premature wear that drive complaints, returns and maintenance cost.
Why the inner weld bead ruins your product.
The inner weld bead is the metallic residue left inside the tube as a result of the ERW process. In standard tubing it can reach between 0.3 mm and 0.8 mm — uncontrolled and inconsistent between batches. When the axle rotates inside the tube, that bead acts as a physical obstacle and produces direct consequences on the finished product.
Perceptible from the first hours. In clinical environments, a reportable incident.
Micro-impacts transmitted to the finished product. Detectable as vibration in the handle or structure.
The axle and tube inner wall wear out through friction. Service life is drastically reduced.
The bead varies between batches. Assembly is unpredictable: sometimes the fit is correct, sometimes there is interference.
With standard market tubing
- Inner bead: 0.3–0.8 mm uncontrolled and variable between batches
- Axle rotation with friction, noise and irregularities from the first cycle
- Premature wear — component replaced sooner than specified
- Variable tolerances — assembly not predictable batch to batch
- Noise complaints on the finished product
- Catalogue diameters that force the design to adapt to stock
With the Delmàs OPTIM range
- Inner bead: max. 0.15 mm — controlled and documented on every batch
- Silent rotation without friction from the first cycle and throughout service life
- Significantly longer component service life
- Dimensional consistency batch to batch — predictable assembly with no rejects
- Zero noise or vibration complaints attributable to the tubing
- Exact diameters to the tenth — the design leads, not the catalogue
Present in every environment where an axle rotates inside a tube.
A supermarket trolley wheel axle rotates thousands of times every day for years. An uncontrolled inner weld bead generates a squeak that worsens over time and turns the trolley into a constant source of complaints for the retailer.
In a hospital, noise is not an aesthetic issue — it is a clinical requirement. Articulated beds, medication trolleys and IV stands must move in complete silence at any hour of the day or night.
In office chairs and workplace mobility solutions, axle performance has a direct impact on perceived quality and comfort. An unstable or loose axle creates vibrations that the user immediately notices.
Conveyor belts and automated warehouse systems run on thousands of rollers and axles rotating continuously. Maintenance and line stoppage cost from roller failure is a critical operational KPI.
OPTIM range: bead ≤ 0.15 mm and diameters exact to the tenth.
The OPTIM range combines outer diameter control (EN 10305-3) with active control of the inner diameter and the weld bead (EN 10305-2) — a technical hybrid that does not exist as a standard product on the market.
From tube to finished component
We manufacture what your assembly line needs to fit
We do not only manufacture the tubing. We deliver the exact component your process needs, eliminating operations at your plant.
Exact length with tight tolerance.
Tapered, punched or custom-machined.
Square, oval or special-geometry.
One manufacturer, zero intermediaries.
This application is present in all industrial sectors with moving components.
Are you experiencing noise or vibration in a rotating mechanism? The cause is likely the tube's weld bead. There is a solution.
Send us your specific challenge and we will design the solution together. We will run a trial with the OPTIM range so you can verify the difference in your own process — with no obligation.
- Technical response within 24 hours
- Non-standard sizes available (7 mm, 8.1 mm…)
- Physical sample to your exact specification