The structure that weighs as little as possible. The mechanism that fits perfectly.
The exact tube for every structure
A pram chassis has to be as light as possible without breaking when bent and must be safe. A security door mechanism has to fit without play through thousands of cycles. A bicycle frame has to be minimum weight without compromising stiffness. These are three different problems. They share the same fundamental solution: the exact precision steel tube the design demands, manufactured to the exact size the design needs.
Structures and mechanisms are the most versatile application in the Delmàs catalogue: all three ranges and all four supply formats have a role here. OPTIM for mechanisms where dimensional fit is critical to function. PREMIUM for structures where surface finish is part of the final product. PRECISE for mechanisms where the tube bore is the working surface. And the finished part for clients who want to receive the finished component — cut, bent, punched — ready to assemble.
The argument that links these three applications is the same: standard catalogue tube cannot deliver what the design demands. Delmàs can. The exact diameter to the tenth, the custom wall thickness, the formability for bending without cracking, the dimensional fit for the mechanism — all manufactured from the mill.
The client sends the drawing. Delmàs manufactures the part. One manufacturer, zero intermediaries, zero operations at the client's plant.
Weight, fit and transformation: the three problems standard tube does not solve, but Delmàs does
Structure weight
In childcare and sport, every gram of tubing is a gram of the product the user carries. Standard tube is heavier than necessary. Reducing wall thickness causes cracking during bending. Not reducing it means the product is heavier than it needs to be.
Wall thicknesses from 0.4 mm with controlled formability allowing close-radius bending without cracking. The design chooses the thickness. Not the catalogue.
Mechanism fit
Closure mechanisms, precision guides and mechanical assemblies require consistent dimensional fit batch to batch. Uncontrolled diameter variation or inner bead prevents that fit or degrades it with use.
With OPTIM: Simultaneous OD + ID control with bead ≤ 0.15 mm. The mechanism works correctly from the first cycle. Batch-to-batch consistency guaranteed.
Intermediate suppliers
A complete chassis requires base tube, cutting, bending, punching and end machining. Managing four different suppliers for a single subassembly multiplies errors, lead times and logistics cost on every order.
We manufacture the tube and deliver the finished component. Cutting, bending, punching, tapering — all integrated. One manufacturer, zero intermediaries.
Structures and mechanisms: the most diverse applications in the Delmàs catalogue
Baby pram chassis (Dorel / BB Confort) and competition bicycle frames (SRAM) need the lightest possible tube — wall thicknesses of 0.4 mm — with formability allowing close-radius bending without weld cracking. And they need to receive it already transformed: cut, bent and punched, ready for final assembly.
Garage door mechanisms, high-security lock cylinders and panic-safe doors require precise dimensional fit between the rotating element and its housing. An uncontrolled weld bead prevents that fit or degrades it with use. And that degradation is mechanism failure.
Seat structures, headrest guides and boot blind mechanisms require consistent dimensional precision batch to batch. On automated serial production lines, a diameter variation between coils generates assembly rejects without an apparent cause at the OEM's line.
Designer furniture structures, modular shelving systems and premium kitchen fittings combine dimensional demands — the profile has to fit exactly — with surface demands: the tube goes into the galvanic bath and any imperfection is amplified in the final finish.
We manufacture the tube. And also the part you need to assemble.
Delmàs's transformation capability turns precision steel tube into the exact component the client's assembly process needs to receive. The client sends the drawing with all specifications — diameters, length, bending radii, holes, end machining. Delmàs manufactures the tube, transforms the component and delivers it ready to assemble directly on the line.
This vertical integration eliminates operations at the client's plant, reduces the number of subassembly suppliers and simplifies the supply chain. The result: fewer handling steps, less risk of damage or error in the component, lower total logistics cost.
Exact cut
Exact length as specified in the drawing. No cutting operation at the client's plant. No end-of-bar scrap.
Controlled bending
Controlled-radius bending that maintains the dimensional tolerances and surface finish of the range.
Machined ends
End tapering, threading, hole punching or inner reaming — any machining the design requires, performed at source.
Finished part
The complete component — tube + transformation — delivered ready for the operator to assemble directly. One single manufacturer, zero intermediaries.
The range depends on whether the requirement is the outer, the inner or the structure
For: mechanisms, guides, closures.
- Bead ≤ 0.15 mm · OD+ID control
- Diameters 3–10 mm
- Sizes to the tenth
- Batch-to-batch consistency
For: structures with galvanic finish.
- Bright surface · OD ±0.05 mm
- Diameters 3–13 mm
- Special profiles available
- Direct chrome plating
For: chassis, frames, bent components.
- Wall thicknesses from 1.1 mm
- Bending without cracking
- Cut+bent+punched+machined
- Delivered ready to assemble
This application is present across every sector
Do you need a lighter structure, a mechanism that fits better or a finished component ready to assemble?
Send us the drawing or a description of the challenge. Our technical team analyses the application and proposes the exact range, at the exact diameter, in the format that optimises your manufacturing process.
- Technical response within 24 h
- Application analysis with no obligation
- Tailored range and format proposal