Custom Sheet Metal Fabrication for Industrial OEMs
Junction Boxes Manufacturer | Custom Sheet Metal Junction Boxes (Prototype to Production)
Rapidsheetfab is a custom sheet metal junction boxes manufacturer in Dongguan, China, supporting industrial OEM customers from one-piece prototypes and NPI builds through low-volume and repeat production. We build junction box enclosures and related fabricated assemblies with engineering support, controlled quality, and export-ready communication.
Request a QuoteWhat We Manufacture
We produce custom metal junction boxes and electrical enclosures used in industrial equipment, automation, instrumentation, energy systems, and machine builds:
- Wall-mount and floor-mount junction boxes
- Control and terminal boxes (industrial electrical enclosures)
- Stainless steel junction boxes for harsh environments
- Aluminum junction boxes for lightweight systems
- Brackets, mounting plates, frames, DIN-rail subpanels, and internal supports
- Welded box assemblies and multi-part enclosure kits
If your project requires more than cutting and bending—such as welding, hardware insertion, tapping, cosmetic finishing, and assembly—Rapidsheetfab is set up to support a one-stop workflow.
Manufacturing Capabilities (In-House)
Our 3,500 m² facility is built for fast-turn custom sheet metal fabrication:
Cutting & Forming
- Fiber laser cutting (up to 2000 × 4000 mm sheets)
- CNC press braking (up to 230T / 3000 mm)
- CNC punching for precision holes, louvers, and formed features
Welding & Hardware
- TIG, MIG/MAG, laser welding, spot welding
- PEM insertion, riveting, tapping M2–M12
Secondary Processes
- Deburring, grinding, brushing
- Basic polishing and assembly
Typical Sheet Metal Range & Tolerances
Typical Thickness Range
0.5–12 mm
Laser Cutting Capacity
Stainless up to 20 mm
Carbon steel up to 25 mm
Aluminum up to 16 mm
Drawing-Dependent Tolerances
- Laser cutting: ±0.10 mm
- Bending: ±0.20–0.30 mm
- Holes: ±0.10–0.20 mm
Materials for Junction Box Fabrication
- Stainless steel: SUS304, SUS316, SUS430
- Steel: SPCC/CRS, Q235/Q355, SGCC/SECC
- Aluminum: 5052, 6061, 5754
- Copper: C1100/T2 and brass: H62 (typically for conductive parts, plates, or special builds)
Surface Finishing Options (Via Qualified Partners)
For junction boxes that require corrosion resistance, cosmetic consistency, or identification marking, we support:
- Powder coating
- Anodizing
- Plating
- Passivation
- Sandblasting
- Electropolishing
- Screen printing
- Laser marking
Note: These finishing processes are provided through qualified finishing partners and should not be considered wholly in-house operations.
Quality Control & Documentation for OEM Requirements
Rapidsheetfab is ISO 9001:2015 certified and supports export-oriented documentation and inspection control.
Quality Flow
IQC → FAI → IPQC → FQC → OQC
Inspection Resources
CMM, 2.5D vision systems, height gauges, and standard inspection tools
Documentation Available Upon Request
- First Article Inspection (FAI)
- Dimensional inspection reports
- Material certificates
- RoHS/REACH documents
- Coating/finishing reports
Prototype to Production Support
Many junction box projects start as a prototype and then move into repeat builds. We support both stages with continuity in process control and communication.
Direct overseas service since 2019; ~55% export sales. Main markets include the United States, Canada, Germany, the UK, the Netherlands, Sweden, Australia, and Singapore.
What Makes a Great RFQ for Custom Junction Boxes
High-value RFQs typically include:
- Drawings: PDF + DXF + STEP/SolidWorks (as available)
- Material and thickness (e.g., SUS304 1.5 mm, SECC 1.2 mm, 5052 2.0 mm)
- Quantity split: prototype + production (e.g., 2 pcs + 200 pcs/month)
- Required processes: cutting, bending, punching, welding, PEM, tapping, assembly
- Finish requirements (powder coat color, passivation, anodize spec, etc.)
- Critical-to-quality dimensions, flatness, cosmetic expectations
- Inspection/document needs: FAI, certificates, labeling/packaging requirements
- Target delivery date and ship-to country
Common OEM Pain Points We Help Solve
Slow or Unclear RFQs
Engineering-responsive review and DFM feedback
Quality Inconsistency
Controlled inspections and documented quality flow
Too Many Vendors
Multi-process fabrication plus assembly support
Prototype-Only Suppliers
Prototype-to-production continuity
Weak Export Communication
Responsive English support and export-ready documentation
Request a Quote (Junction Boxes Manufacturing)
Send your drawings and requirements, and we'll review manufacturability and provide a clear quotation with lead time.
Recommended Files
STEP/SolidWorks + DXF + PDF
Include
Material, thickness, quantity, finish, and any critical requirements
If you're looking for a junction boxes manufacturer that can support both fast prototypes and repeatable OEM production, Rapidsheetfab is ready to help.