Professional Sheet Metal Custom Stainless Steel Electrical Panel Box Assembly

Stamping | Bending | Welding | Surface Treatment - Full Process Under One Roof

What We Actually Make

Not every electrical enclosure needs to be a catalog item. Most projects don't.

We manufacture custom sheet metal electrical panel boxes from raw coil to finished assembly. The process is stamping, CNC punching, laser cutting, bending, welding, surface treatment, and component mounting - all in sequence, all under our control.

The result is a box that fits your exact dimensions, cutouts, mounting pattern, and environmental rating. Not a standard enclosure with extra holes drilled after the fact.

Material Options

Grade	Composition	Typical Use	Relative Cost
SPCC / SECC	Cold-rolled steel, electro-galvanized	Indoor distribution panels, general electrical	Baseline
SGCC	Hot-dip galvanized steel	Outdoor enclosures, moderate corrosion exposure	+15%
SS304	18% Cr, 8% Ni stainless	Food processing, chemical plants, coastal	+80%
SS316	16% Cr, 10% Ni, 2% Mo stainless	Marine, offshore, heavy chemical, salt spray	+120%
AL5052 / AL6061	Aluminum alloy	Lightweight applications, heat dissipation critical	+60%

Note on thickness: We do not recommend below 1.2mm for any electrical enclosure subject to handling or tool impact. Below 1.5mm, door flex becomes noticeable. For outdoor or industrial applications, 2.0mm is our standard recommendation.

Manufacturing Process

Step 1: Blank Preparation

Method	Thickness Range	Tolerance	Best For
Stamping (progressive die)	0.5–3.0mm	±0.05mm	High volume, simple geometries
CNC Turret Punch	0.5–6.0mm	±0.10mm	Medium volume, complex hole patterns
Fiber Laser	0.5–25mm	±0.03mm	Low volume, intricate shapes, no tooling cost

Most electrical panel boxes use a combination: laser for outer profile and irregular cutouts, CNC punch for standard mounting holes and ventilation slots, stamping for high-volume internal brackets.

Step 2: Bending

CNC Press Brake (Amada / Trumpf), 6-axis backgauge

Bending length: up to 3,000mm

Bend angle accuracy: ±0.5°

Minimum bend radius: 0.5× material thickness (standard), 1.0× for stainless

Critical for electrical enclosures: bend relief notches at corner intersections to prevent tearing and ensure clean weld joints.

Step 3: Welding

Method	Application	Appearance
TIG (GTAW)	Stainless steel, cosmetic welds	Clean, minimal grinding required
MIG (GMAW)	Carbon steel, structural joints	Faster, post-grind needed
Spot Welding	Internal brackets, hinge attachments	Hidden joints
Riveting	Aluminum, dissimilar metals	No heat distortion

For IP-rated enclosures, all weld seams are continuous and ground flush before surface treatment. Gaps or porosity will fail IP testing.

Step 4: Surface Treatment

Finish	Process	Thickness	Salt Spray (ASTM B117)
Powder coat (RAL 7035)	Electrostatic spray, 180°C cure	60–80μm	240 hours
Powder coat (RAL 7032)	Same, textured finish	60–80μm	240 hours
Electro-galvanized	Zinc plating	5–8μm	72 hours
Hot-dip galvanized	Immersion in molten zinc	40–80μm	720 hours
Passivation (SS only)	Nitric acid bath	-	Significant improvement
Electropolish (SS only)	Electrolytic smoothing	20–40μm removed	Maximum corrosion resistance

Important: Powder coat over stainless steel requires special etch primer. Without it, adhesion fails within 12 months in outdoor exposure. We do not skip this step.

Step 5: Assembly & Component Mounting

DIN rail installation (35mm standard, 32mm optional)

Terminal block mounting

Circuit breaker / contactor / relay installation

Busbar fabrication and installation

Door seal gasket fitting (EPDM, silicone, or neoprene)

Hinge, latch, lock installation

Cable gland plate preparation

All assembly is documented with photos at each stage for customer verification before shipping.

Dimensional Capabilities

Parameter	Range	Notes
Maximum single piece size	3,000 × 1,500mm	Limited by laser bed and press brake
Typical enclosure size	200 × 200 × 150mm to 2,000 × 1,200 × 600mm	Wall-mount or floor-standing
Sheet thickness	0.5 – 6.0mm	Standard electrical: 1.2–2.5mm
Hole diameter (punched)	Ø3 – Ø88mm	Standard tool library
Hole diameter (laser)	Ø1 – unlimited	No tooling constraint
Threaded insert (PEM)	M3 – M10	Press-fit or weld-in
Tolerance (linear)	±0.2mm (≤500mm), ±0.5mm (>500mm)	Tighter on request

IP Rating & Testing

We build to and test for:

IP Code	Protection	Test Method	Typical Application
IP30	Solid objects >2.5mm	Probe test	Indoor, clean environment
IP42	Solid objects >1mm, dripping water	Probe + drip test	Light industrial
IP54	Dust limited, water spray	Dust chamber + spray nozzle	Outdoor, rain exposure
IP55	Dust limited, water jets	Dust chamber + jet nozzle	Heavy washdown
IP65	Dust tight, water jets	Vacuum dust + jet nozzle	Outdoor, harsh
IP66	Dust tight, powerful water jets	Vacuum dust + high-pressure jet	Marine, offshore

Testing is conducted in-house with calibrated equipment. Third-party certification (SGS, TÜV, Intertek) available on request.

Quality Control Points

Stage	Check	Method	Acceptance
Incoming material	Thickness, hardness, surface	Caliper, durometer, visual	Per mill cert
After laser/punch	Dimensions, hole positions	CMM, pin gauge	±0.1mm
After bending	Angle, flange length, radius	Protractor, caliper	±0.5°, ±0.2mm
After welding	Penetration, porosity, dimension	Visual, dye penetrant, caliper	No cracks, no gaps
After surface treatment	Thickness, adhesion, color	Eddy current, cross-hatch, colorimeter	60–80μm, Grade 0–1
Final assembly	Function, fit, IP seal	Door closure, gasket compression, spray test	No leakage
Pre-shipment	Full dimension, photo record	CMM, photography	Per drawing

What We Need From You

To quote accurately, provide any combination of:

Option A - Drawing

2D manufacturing drawing (DWG, DXF, PDF)

Or 3D model (STEP, IGES, SolidWorks)

Option B - Sample

Physical sample for reverse engineering

We measure, draw, quote, and build to match

Option C - Description

Internal dimensions (W × H × D)

Material and thickness

IP rating requirement

Cutout locations and sizes

Component mounting requirements

Surface finish and color

Quantity and delivery schedule

Typical Lead Times

Quantity	Complexity	Lead Time
1–10 units	Simple (laser + bend + weld)	10–15 working days
1–10 units	Complex (multiple processes, assembly)	20–25 working days
50–200 units	Stamping die required	25–30 working days (after die approval)
500+ units	Progressive die, high volume	Confirm with project review

Stamping die cost: Typically $2,000–$8,000 depending on complexity. Amortized over volume, unit cost drops 30–50% versus laser/punch methods.

Why Sheet Metal Stamping for Electrical Enclosures

Factor	Stamping	Fabrication (Laser + Bend)
Unit cost (high volume)	Low	Higher
Unit cost (low volume)	High (die amortization)	Lower
Dimensional repeatability	Excellent (±0.05mm)	Good (±0.1mm)
Surface finish consistency	Excellent	Good
Speed (per piece)	Seconds	Minutes
Tooling investment	Required	None
Design change flexibility	Limited (die modification)	High

Rule of thumb: Below 100 units, laser + bend is usually more economical. Above 500 units, stamping pays for the die and delivers superior consistency. Between 100–500 units, we analyze both and recommend the better option.

Industries We Serve

Power distribution - Meter boxes, distribution panels, MCC enclosures
Renewable energy - Solar combiner boxes, inverter enclosures, battery cabinets
Data centers - PDU housings, busway tap boxes, cable management
Industrial automation - PLC enclosures, HMI panels, junction boxes
Transportation - Railway signal boxes, EV charging station housings
Telecommunications - Base station cabinets, fiber distribution boxes

Certifications & Standards

ISO 9001:2015 - Quality management system
ISO 14001:2015 - Environmental management
Welding certification - AWS D1.1, EN 1090 (on request)
Material certification - Mill test reports, RoHS compliance
Third-party inspection - SGS, TÜV, BV, Intertek (arranged per customer requirement)