One-stop precision sheet metal manufacturing
One-stop OEM partner for electrical enclosure: MetlTek runs precision sheet metal, mechanical assembly and complete unit delivery from a single plant in Kunshan, China. Founded in 2001, the factory runs three laser cutting machines (a Trumpf 3030 plus two Hongshan machines, the largest 6000 x 2540 mm), a 6.5 m CNC gantry machining center, a Salvagnini P2Lean bending center, Panasonic and Fronius welding robots and an 8 m rail-mounted welding cell. Finished goods ship to industrial customers across Europe and North America.
Three commitments we are judged on by every customer, on every order.
Round-the-clock response
Send drawings at any hour — an engineer replies within one working day, not an automated ticket.
Factory-direct pricing
No trading layer in between. You buy from the plant in Kunshan that actually cuts, bends and welds the parts.
Delivery you can plan around
Committed lead times, serialised inspection records and export packing that survives ocean freight.
| Material | Cold-rolled steel DC01, galvanised steel, stainless steel 304 / 316, aluminium |
|---|---|
| Sheet thickness | 0.8 – 6.0 mm |
| Tolerance | ± 0.05 mm (laser cut, all machines), ± 0.25° (Salvagnini / TRUMPF bending), ± 0.3 – 0.5° (conventional brakes) |
| Surface finish | Powder coating to RAL (2 automatic lines), zinc plating, brushed or polished |
| Minimum order | 1 piece for prototypes, series from 50 pieces |
| Lead time | Sample 7–10 working days · series 3–5 weeks |
An electrical enclosure is not a box with a door. It is the part that sets the protection rating, carries the earth path, decides how the electronics are cooled, and — if it ships assembled — is the surface your customer's operator touches every shift. Those four jobs are decided in the sheet metal: the seam detail, the gasket rebate, the louvre area and the earth stud. We cut, form and weld the shell, coat it, and where the order calls for it, build the panel inside before it leaves.
| Shell material | Cold-rolled DC01, galvanised steel, stainless 304 / 316, aluminium |
|---|---|
| Sheet and frame | 0.8 – 6.0 mm shell; frame sections from 1.5 mm |
| Cutting and forming | ± 0.05 mm laser-cut; ± 0.25° on the Salvagnini panel bender |
| Largest shell in one piece | Cut to 6,500 × 4,700 mm on the gantry laser, T25 mm mild steel |
| Protection | IP54 as the standard build; IP66 on gasketed, seam-welded shells |
| Earth continuity | Welded earth stud, pull-tested and recorded per batch |
Two questions come up on almost every enclosure order, and both are sheet metal questions rather than catalogue questions: how the heat leaves, and which accessories have to be built into the shell instead of bolted on later. Venting is cut and formed into the shell — louvres, fan apertures or a filtered inlet panel — and the accessory set is fixed at the same time, because where a mounting plate or a gland plate lands changes the layout everything else has to fit around.
| Louvres | Punched and formed into the shell or door for passive convection. The open area is sized to the heat load, not copied from a template. |
|---|---|
| Fan and filter apertures | Cut-outs sized to the fan frame, with a filtered inlet panel on the opposite face so air actually crosses the electronics instead of short-circuiting across the top. |
| Gland plates | Removable plates in the base or floor, cut to your cable range, so the enclosure is still sealed after wiring. |
| Mounting plates | Zinc-plated or painted plates positioned to the component layout, not to a default center line. |
| Rain hoods and plinths | Formed accessories that keep water off the door seam and lift the shell clear of a wet floor. |
| Hinges, locks and handles | Chosen against door weight and protection rating together: a heavy double door needs a different hinge to a 400 mm single door. |
| Earth studs and bonding | Welded studs, pull-tested and recorded per batch, so the earth path is documented rather than assumed. |
Four things that decide whether a metal enclosure project lands on time and on budget.
Tolerances we can hold
±0.1 mm on laser-cut features and ±0.3 mm on formed parts, verified before dispatch.
Quality you can audit
ISO 9001 processes, first-article inspection and a measurement report with every series batch.
One supplier, five processes
Cutting, bending, welding, coating and mechanical assembly under one roof — no hand-offs between vendors.
Built for export
Export-grade packing, customs documentation and container loading planned for Europe and North America.
Optical sorter cabinets, infeed frames and buffer hoppers for Tomra (Norway). Anti-stray light precision is achieved through bending tolerance, robot seam welding and matte black interior coating. Highlights: precision light sealing, 6.5 m gantry machining in one setup, matte black interior.
Deep-drawn fan scrolls, guide rings and impeller shrouds for Ziehl-Abegg (Germany). One-piece forming means fewer seams and smoother inner walls, so pressure loss and noise stay low. Highlights: one-piece deep drawing, robot circumferential sealing weld, accurate balance datum.
Vertical collector housings with conical dust hoppers and support frames for Camfil (Sweden). Fully welded gas-tight construction with machined sealing flanges. Highlights: gas-tight welding, anti-bridging hopper forming, machined flange faces, outdoor-grade coating.
Laser machine control cabinet and sealed top housing (sheet metal structure only) for Trumpf (Germany). Sealing is continuous across the top joint so the IP66 rating carries across the whole cabinet. Highlights: IP66 sealing, sealed top transition, oil-resistant industrial coating.
Split upper and lower equipment frames with a machined mounting plate between them for AP TECH (Korea). The 6.5 m gantry mills the mounting face in one setup and assembly gaps are held uniformly. Highlights: gantry-machined mounting face, granite plate fitting, assembly gap control, rigid vibration-damped frame.
Sectioned conveyor frames, support structures, side guarding and drive housings (sheet metal structure only) for Vanderlande (Netherlands). 8 m rail-mounted robot welding keeps long sections straight and interfaces interchangeable. Highlights: long-section robot welding, interchangeable section interfaces, outdoor salt-spray coating.
Earth continuity through paint
Powder coating is an insulator. Earth studs are welded to bare metal and masked before the shell is coated, then pull-tested — rather than relying on a screw thread biting through a paint film.
Door and gasket compression
A gasket only seals inside its compression range, and door flatness decides whether it gets there. Doors are checked against the frame they will close onto, not against the drawing alone.
Thermal path and airflow
Louvre area and fan cut-outs are sized for the airflow the electronics need, not for how they look. An undersized or blocked inlet is the most common reason a cabinet runs hot.
Gland plate interchangeability
Gland plates are cut to a retained pattern, so a replacement plate from a later batch still fits a cabinet that was installed three years ago.
Quality is measured, not claimed. A precision inspection system compares 40 million measurement points against your CAD in 0.1 seconds per part, and every batch is documented under our ISO 9001 system. Reference customers include TOMRA, TRUMPF, RITTAL, ZIEHL-ABEGG, CAMFIL, VANDERLANDE, MAHLE and WEISS TECHNIK.
There is no fixed MOQ. Prototypes and small batches from one piece are accepted, and unit prices fall as volume grows. One-off tooling cost is quoted separately.
Yes. We regularly work under NDA and produce strictly to customer drawings. Files stay on an internal server and are never shared with third parties.
A first-article sample is typically ready in 7–10 working days, and series production runs in 3–5 weeks depending on quantity and surface finish.
We supply the sheet metal, mounting plate, DIN rail, hinges, locks and gland hardware mechanically assembled and dimensionally checked. Electrical components, busbar work, wiring and functional testing stay with your own electrical supplier — that boundary is deliberate, so you keep one accountable party for the electrical scope.
IP54 is the standard build. IP66 is achieved with gasketed, seam-welded construction and is verified by leak testing rather than by visual inspection.
Yes — send the cable schedule or a gland-plate drawing and the openings are cut and labelled during fabrication, so no drilling happens on site.
Send your drawings and quantity — you will get a quotation with lead time, not a sales script.
Tell us what you need — our engineer replies within 1 working day.