Precision Engineering for Global OEMs

Custom Outdoor Metal Cabinet services

From rapid prototyping to high-volume production, Supro MFG delivers one-stop precision metal fabrication with ISO-certified quality. Reduce your lead times and production costs with our expert DFM support.

1-3 day Rapid Prototyping & Agile Supply Chain Delivery.
On-time delivery of high quality product commitments.
Extensive Material Selection & Industrial-Grade Finishing.
Direct-from-Factory Pricing & Transparent Costing.
ISO 9001-2015 / IATF 16949:2016 certified system.
Integrated Assembly: Delivering finished, ready-to-use products, not just components.

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Rapid Prototypes, DFM Optimization, On-Time Delivery, Real Manufacturer Quote.

Rapid stamping die Turnaround

Committed to exceeding expectations for quality and rapid turnaround, and meeting high-quality sheet metal parts.

Consistency & high quality

Whether it is rapid prototyping & large-volume manufacturing, we will implement it according to customer needs and standards.

Low Cost Effective

Integrate product design, bending, stamping, cutting, surface treatment, etc. to provide a series of manufacturing solutions.

Precision Metal Fabrication Services in China | Custom OEM Solutions & Rapid Prototyping

Your Strategic Partner for Outdoor Metal Cabinet Fabrication

At Supro MFG (Supro Manufacturing Co., Ltd.), we don’t just manufacture parts; we engineer reliability. As a leading China metal fabrication factory, we bridge the gap between complex design and cost-effective production. By leveraging our ISO 9001:2015 & IATF 16949 certified facilities and a seasoned engineering team, we provide 3,000+ global clients with unparalleled custom metal fabrication services—direct from the source with transparent, manufacturer-level pricing.

We specialize in the high-quality manufacturing and assembly of custom metal parts, with processing capabilities encompassing: sheet metal fabrication, metal stamping, CNC machining, laser cutting, metal welding, metal spinning, deep drawing, aluminum extrusion, die casting, as well as customized finished product assembly and surface treatment services.

From concept prototypes to mass production,

Supro MFG is your most reliable partner and you will benefit from our manufacturing services.

Securing Your Designs with Enterprise-Grade Confidentiality at Every Stage of Manufacturing

Your Innovation, Protected:
Uncompromising IP Security & NDA Compliance

At Supro MFG, we understand that your designs are your most valuable assets. As a strategic sheet metal stamping partner, our commitment to your intellectual property is absolute. We operate under a strict Zero-Leak Policy, ensuring that every blueprint, CAD file, and prototype remains strictly confidential within our secure engineering ecosystem.

We proactively offer comprehensive Non-Disclosure Agreements (NDAs) that align with international legal standards, providing you with a transparent and enforceable framework for cooperation. Beyond legal paperwork, our internal protocols include segmented data access, secure server encryption, and rigorous staff training on IP sensitivity. Whether you are a startup scaling a disruptive product or an OEM managing sensitive aerospace components, Supro MFG acts as a secure extension of your own facility. Partner with a metal stamping manufacturer that values your competitive advantage as much as you do.

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What Is an Outdoor Metal Cabinet?

Designed to withstand extreme environments, the Outdoor Metal Cabinet is a rugged, weatherproof enclosure engineered to protect sensitive electrical, telecommunications, and utility equipment from harsh weather conditions. Constructed from high-quality galvanized steel, marine-grade aluminum, or 316L stainless steel, the Outdoor Metal Cabinet meets critical NEMA 4X and IP66 protection standards.

Through precision CNC bending and continuous robotic seam welding, we eliminate structural weak points and potential entry points for moisture. Each Outdoor Metal Cabinet features a UV-resistant thermoset powder coating and seamless field-injected (FIPG) polyurethane gaskets to withstand prolonged sun exposure, heavy rain, and corrosive environments.

At Supro MFG, leveraging our extensive experience in metal cabinet manufacturing, we offer scalable OEM and ODM manufacturing services and can customize engineering dimensions, thermal management systems, and installation configurations to meet your project’s specific on-site requirements.

Common Issues with Outdoor Metal Cabinets

When procuring outdoor metal cabinets for telecommunications, utility power, or renewable energy applications, environmental adaptability is a primary consideration. Any failure in the cabinet’s structural integrity or weather resistance can result in catastrophic damage to the sensitive electronic equipment inside. Drawing on extensive experience in engineering design and sheet metal fabrication, Supro has analyzed the most critical manufacturing defects in outdoor metal cabinets, their root causes, and the rigorous quality control measures required to prevent them.

Electrochemical Corrosion (Galvanic Corrosion)

Localized, accelerated, and severe rusting appears around fasteners, hinges, or mounting brackets on outdoor metal cabinets. The root cause is galvanic corrosion resulting from the contact of dissimilar metals (e.g., using galvanized carbon steel screws on a 316L stainless steel cabinet) in an electrolyte environment such as rainwater or high humidity.

Supro strictly adheres to electrochemical series principles during the design phase. We use fasteners made of the exact same material grade as the cabinet, or completely isolate dissimilar metals using nylon washers, insulating grease, or specialized insulating gaskets.

Microcracks in Continuous Seam Welds

Hairline cracks invisible to the naked eye exist at the weld corners. Due to capillary action, moisture penetrates, thereby compromising the IP66 or NEMA 4X protection rating. The primary causes of this issue in outdoor metal cabinets are: inconsistent manual TIG welding processes, thermal fatigue during cooling, or inappropriate weld penetration depth and shielding gas coverage.

Supro employs automated robotic laser or TIG welding units to achieve fully consistent continuous seam welding. We perform non-destructive testing (NDT), such as penetrant testing, on the first production batch to verify absolute watertightness.

Internal Condensation

Water droplets form on the inner walls and ceiling of fully sealed outdoor metal cabinets. Although there is no external leakage, this can still cause electrical components to short circuit. The root cause of this issue is the temperature difference between the interior and exterior of the fully sealed cabinet, which causes the ambient humidity trapped inside during assembly to reach the dew point.

Supro incorporates thermal management and pressure equalization mechanisms into its sheet metal design. By installing hydrophobic breather valves (vent plugs), the cabinet is able to “breathe” to release pressure and moisture while blocking liquid water and dust.

Filiform Corrosion at Sharp Corners

Filiform rust originating from sharp corners of laser-cut panels or ventilation openings gradually spreads beneath the powder coating. This phenomenon occurs in outdoor metal cabinets because, during the curing process, surface tension causes liquid powder to peel away from sharp 90-degree corners, resulting in dangerously thin coating thickness at the edges.

Supro performs edge chamfering (rounding) prior to spraying. A two-coat system is used: first, a zinc-rich epoxy primer is applied to achieve excellent corrosion resistance, followed by a UV-resistant polyester topcoat.

No design files? Let Supro MFG do it for you.

We often come across clients who have no professional design drawings and documentation, only a creative idea, which leads to the project being at a standstill.

If you are in this situation, then contact our team of experts.

Supro MFG, as an industry-leading custom metal fabricator, has an ever-experienced team of engineers who utilize their extensive fabrication experience and technical expertise to build your idea into a real product and create design files such as STEP/STP/SLDPRT/DXF/PDF/PRT/DWG/AI.

That’s what makes SUPRO MFG so great, and 2,000 corporate, entrepreneurial, artist, and other purchasers from around the world enjoy working with us and benefiting from our one-stop manufacturing services.

A part is only as good as its finish.

High-Performance Surface Finishing: Aesthetics Meets Durability

At Supro MFG, we understand that professional custom metal fabrication requires more than just structural integrity—it demands surface treatments that withstand harsh environments and strict aesthetic standards.

Our integrated finishing shop provides a seamless transition from the production line to the final coating, ensuring tight control over lead times and quality.