One-stop precision sheet metal manufacturing
One-stop OEM partner for instrument 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 instrument enclosure holds the sensor, the optics or the analyser, so anything the enclosure does to the measurement is a defect: thermal drift on the mounting face, a vibration path from a fan, a burr that ends up inside a closed housing. The brief is therefore flatness and cleanliness as much as shape. We flatten and, where required, surface-grind mounting faces, cut aperture-critical panels in one set-up, and clean every part before the enclosure is closed.
| Mounting face flatness | 0.1 mm per 300 mm, or to the figure agreed on the drawing |
|---|---|
| Aperture tolerance | ± 0.1 mm on aperture-critical panels, cut in one set-up |
| Materials | Aluminium, stainless 304 / 316, cold-rolled steel |
| Face finishing | Surface grinding for flat and parallel faces; vertical milling for pockets |
| Cosmetic finish | Matt powder coat, brushed or anodised aluminium |
| Cleanliness | All parts deburred, washed and inspected before the enclosure is closed |
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.
Thermal stability of the datum face
An optical bench mounted on a panel that moves 0.2 mm between cold start and running temperature never holds alignment. Where the figure matters, the face is flattened and corrected after welding, then measured.
Contamination inside a closed housing
A burr or a chip sealed inside an instrument becomes a lifetime fault that no incoming inspection will catch. Assemblies are cleaned before closing, not after.
Vibration and resonance
Thin unsupported panels drum under a fan and put that energy straight into the measurement. Stiffening ribs and folded edges are added where the instrument spec calls for them.
Aperture coaxiality
A beam or connector aperture that is correct on its own can still be wrong once the housing is assembled. Apertures that must line up are cut from one set-up against a common datum.
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.
Yes — on a machined or surface-ground face, or by correcting after welding. We agree the flatness figure and the datum on the drawing before the material is cut.
Yes. Aluminium is cut, formed and finished separately from steel to avoid cross-contamination, and is anodised or given a conductive pre-treatment before coating.
Parts are deburred, washed and inspected before assembly, and every internal operation is completed before the housing is closed.
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.