Precision Engineering for Global OEMs

Custom Weatherproof Enclosure 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.

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

Rapid prototype 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.

What is a Weatherproof Enclosure?

A weatherproof enclosure is a protective housing designed to shield sensitive equipment—such as wiring, electronic components, and network devices—from outdoor elements like rain, snow, dust, sunlight, and extreme temperatures. It ensures reliable operation in harsh environments.

With over 20 years of experience in enclosure fabrication, Supro understands that true weatherproof performance requires more than just basic metal bending; it demands a structure capable of withstanding UV degradation, heavy rain, and extreme temperature fluctuations. We achieve this by using marine-grade 316L stainless steel or reinforced aluminum alloy, combined with a continuous TIG welding process that eliminates capillary action, thereby completely eliminating microscopic moisture penetration pathways. By integrating automatically formed in-place foam gaskets (FIPG) and UV-resistant outdoor powder coatings, we ensure that the weatherproof enclosure’s seal remains effective over time and prevent surface chalking of the equipment under intense sunlight.

Supro MFG offers comprehensive custom sheet metal fabrication services to transform your complex CAD designs into fully certified, ready-to-deploy weatherproof enclosures.

Wall-Mount Weatherproof Enclosure

Floor-Standing Weatherproof Enclosure

Pole-Mount Weatherproof Enclosure

Modular Weatherproof Enclosure

Rack-Mounted Weatherproof Enclosure

Multi-Door Weatherproof Enclosure

High IP-Rated Weatherproof Enclosure

NEMA-Rated Weatherproof Enclosure

Explosion-Proof Weatherproof Enclosure

High-quality Weatherproof Enclosure:
up to 5 years’ after-sales warranty

Whether it is to combat salt spray corrosion in coastal environments or to ensure the all-weather, outdoor operation of new energy equipment, we provide a full range of bespoke services, from design and engineering through to precision sheet metal fabrication and rigorous quality inspections, to build a robust safety barrier for your electrical systems.

As a professional manufacturer of custom Weatherproof Enclosure, Supro Mfg designs highly reliable electrical protection solutions tailored to our customers’ needs in harsh industrial and outdoor environments. Leveraging high-precision sheet metal fabrication and CNC machining technology, we can customize a wide range of metal NEMA enclosures.

We select high-quality 304/316 stainless steel and aluminum alloy materials. Through precision laser cutting, CNC bending, and continuous corrosion-resistant welding processes, we ensure our products offer exceptional dust and water resistance, corrosion resistance, and impact resistance, making them safe for use in demanding environments such as chemical plants, offshore engineering, and outdoor settings subject to strong seismic activity.

Supro Mfg strictly adheres to a professional quality control system and is committed to providing a 5-year warranty, delivering highly reliable custom NEMA enclosures.

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 product design is your most valuable asset. As your strategic partner, we sign a rigorous NDA confidentiality agreement before launching any custom NEMA enclosure project, ensuring absolute protection for your intellectual property.

We strictly enforce a zero-leakage policy, ensuring that every blueprint, CAD file, and prototype remains strictly confidential within our secure engineering ecosystem. With no third parties involved in the process, we eliminate the risk of technical leaks and provide comprehensive protection for your startup’s designs and core patents.

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One-Stop Solution for Custom Metal Weatherproof Enclosure Parts

Comprehensive Metal Weatherproof Enclosure Fabrication Services

Sheet Metal Fabrication Services

Aluminum Extrusion Services

CNC Machining Services

Metal Spinning Services

Deep Drawing Stamping Services

metal die casting Services

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

Your Strategic Partner for Weatherproof Enclosure 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.

metal Weatherproof Enclosure fabrication Material Solutions

At Supro MFG, we offer a full range of metal materials to meet the demanding requirements of any industry or environment, and we can proactively advise our customers on metal fabrication techniques that utilize the properties of the materials to maximize the life and functionality of their products.

Aluminum Alloy Weatherproof Enclosure

5052 / 6061

It is more than 50% lighter than steel, features a naturally formed aluminum oxide protective layer, and offers extremely high thermal conductivity, making it the ideal material for high-power outdoor heating equipment (such as 5G base stations and energy storage systems).

Common Surface Treatment Solutions:

Aluminum Alloy Weatherproof Enclosure + Sandblasting + Anodizing: Anodizing can alter the surface texture and color, enhance the product’s wear resistance and impact resistance, and improve the aluminum alloy’s impact resistance.

stainless steel Weatherproof Enclosure

304 / 316 / 316L

Gold-grade material meeting the NEMA 4X standard. 316L stainless steel, with added molybdenum, resists corrosion from strong acids and alkalis as well as high-salinity marine salt fog; its mirror-polished or brushed finish prevents dirt buildup and is extremely easy to clean.

Common Surface Treatment Solutions:

Stainless Steel Weatherproof Enclosure + Brushed and Polished Finish: Stainless steel contains elements such as chromium and molybdenum. After undergoing a brushed and polished finish, it provides effective corrosion resistance, is easy to clean, and always maintains a shiny, like-new appearance.

Carbon steel Weatherproof Enclosure

The best value NEMA 3R/4/12 option. Thanks to rigorous acid washing and phosphating pretreatment and a thick polyester coating, it can withstand years of exposure to UV rays, wind, and rain outdoors.

Common Surface Treatment Solutions:

Carbon steel Weatherproof Enclosure + powder coating/anodizing/electroplating: After undergoing high-quality chemical surface treatment, these enclosures effectively resist damage from outdoor UV radiation and can withstand outdoor environments exposed to wind and sun.

galvanized steel Weatherproof Enclosure

NEMA enclosures made of galvanized steel offer both high mechanical strength and excellent value for money. Their built-in zinc coating provides reliable basic corrosion protection, enabling stable operation in coastal or acidic/alkaline corrosive environments.

Common Surface Treatment Solutions:

Galvanized steel Weatherproof Enclosure + powder coating: This dual-protection solution involves applying a polyester coating to the surface of the metal substrate, effectively shielding it from corrosive air and liquids while providing high corrosion resistance.

From DFM assessments to rigorous protection testing

Reasonable surface treatment of metal parts can improve the durability, corrosion resistance, heat resistance, electrical conductivity and appearance decoration of the material.

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As a professional B2B custom sheet metal manufacturer, we are committed to eliminating all potential risks in engineering procurement and project management. Upon receiving a customer’s 3D CAD model (e.g., STEP, IGES), our experienced sheet metal engineering team will provide a detailed DFM (Design for Manufacturability) report within 24 hours.

Assessment of sheet metal bending radius feasibility;
Early warning of crack risks at cut edges and hole margins;
Simulation of welding heat distortion and inspection of weld accessibility;
Cost optimization recommendations based on our standard die library.

We specialize in pushing the boundaries of standard dimensions and interface limitations for electrical enclosures. After analyzing the application environment and functional requirements, we conduct professional DFM analysis to proactively provide one-stop custom NEMA enclosure manufacturing services and technical support.

Common Manufacturing Defects in Weatherproof Enclosures: Causes and Solutions

When purchasing reliable weatherproof enclosures, simply reviewing the spec sheet is not enough. Outdoor environments are harsh, and even minor manufacturing defects can lead to water ingress, UV degradation, or hardware failure. Based on actual quality assurance data and field failure reports, here are several key defects to watch out for.

Warping of Weatherproof Enclosure Doors Caused by Thermal Stress

Weatherproof enclosure doors may bulge outward at the top or bottom corners, preventing the gasket from being pressed evenly against the seal. The root cause is the use of metal sheets that are too thin relative to the door’s surface area during the manufacturing or design process, leading to deformation under the effects of heat gain from direct sunlight or residual welding stresses.

For larger doors, thicker steel plates or marine-grade aluminum should be selected. More importantly, CNC-welded internal stiffeners (U-channels) should be incorporated into the flat-pattern design to ensure the structure remains absolutely flat regardless of temperature fluctuations.

Deformation of the Weatherproof Enclosure During Transport

The weatherproof enclosure arrived at the deployment site already deformed, deviating from its original structure. The door was jammed against the cabinet frame, and the weatherproof seal was permanently damaged even before installation began. The root cause lies in the long-distance transport of the heavy, empty metal structure without internal bracing, compounded by excessive strapping tension on the shipping pallet. So, how can this be resolved?

Design customized shipping packaging. Insert temporary diagonal wooden or heavy-duty corrugated cardboard support rods inside the empty weatherproof enclosure. Use heavy-duty corner protectors and shock-absorbing EPE foam beneath the stretch film to ensure that the strapping tension is evenly distributed across the entire frame.

Capillary Leakage at Weld Corners

During heavy rain or high-pressure water jet cleaning, trace amounts of moisture can seep in through the outer corner welds. The root cause is pinholes, porosity, or lack of fusion in the continuous weld, typically resulting from inconsistent manual TIG welding or insufficient shielding gas.

Supro implements strict pre-welding solvent wiping procedures. Critical structural welds are converted to automated robotic laser welding or pulsed TIG welding. This ensures stable heat input, sufficient penetration depth, and the formation of fully dense welds free from capillary leakage.

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.

Professional manufacturing processes and hardware components work together to create a robust protective system

High-Quality Weatherproof Enclosure Hardware Options

The exceptional protective performance of NEMA enclosures is made possible by high-quality hardware components. In our sheet metal manufacturing, we extensively use standard PEM® self-clinching rivet nuts and studs; these fasteners provide high-strength load-bearing threads in thin sheets without the need for welding. This not only maintains the smooth and aesthetic surface of the enclosure and prevents thermal deformation caused by welding, but also significantly enhances overall sealing and corrosion resistance.

Self-clinching nuts (S/CLS)
Self-clinching standoffs (SO/BSO)
Self-clinching studs (FH/FHS)
Flush nuts (F)
Floating nuts (AS/AC)
Blind standoffs (BSO)
Spring-loaded plungers (PTC)
Panel fastener assemblies (PF11)
Pilot pins (TPS)
Concealed-head standoffs (CSS)
Continuous / Piano hinges
Concealed hinges
Quarter-turn locks
T-handle locks
Quick-release latches
PU foam gaskets (Pour-in-place)
EPDM rubber weatherstripping
Padlock hasps
Stainless steel grounding studs
Waterproof vent plugs / Breathers

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.