Custom cast iron junction box
Our custom cast iron junction boxes are precision sand-cast for industrial electrical installations, hazardous area wiring, and explosion-proof enclosure applications. Each box features a bolted flat-face cover with stainless steel hardware, providing a robust IP65 or IP66-rated seal against dust, moisture, and corrosive atmospheres. Fully customizable in external dimensions, wall thickness, cable entry positions, and internal mounting boss layout, with OEM and ODM orders supported and sample production available before mass order commitment.
*Provide your application requirements—such as stress conditions, materials, size range, and even product name. We are always available for customization, so please contact us directly.
Introduction
Why Choose Our Cast Iron Junction Boxes?
Explosion-Proof & Hazardous Area Rated — Cast iron construction with a precision-machined flameproof joint meets ATEX and IECEx requirements for Zone 1 and Zone 2 hazardous area installations in oil, gas, chemical, and mining environments.
IP65 / IP66 Ingress Protection — The flat-face bolted cover with compressed gasket provides full protection against dust ingress and high-pressure water jets, making our junction boxes suitable for outdoor, wash-down, and marine installations.
Stainless Steel Hardware Throughout — All external fasteners, hinges, and clamps are supplied in stainless steel as standard, preventing corrosion-related seizure and ensuring reliable cover removal during maintenance in harsh outdoor and coastal environments.
Custom Cable Entry & Knockout Configuration — Cable entry positions, conduit thread sizes (M20, M25, NPT, G thread), and internal mounting boss layout are all fully customizable to your wiring schematic and installation requirements.
Precision-Machined Cover Mating Face — The cover and body mating faces are CNC-machined to a tight flatness tolerance, ensuring consistent gasket compression and a reliable IP and flameproof seal across all production units.
Specifications
Category Detailed Specifications & Technical Features Product Name Custom cast iron junction box Scope of Services • OEM/ODM Custom Enclosure Manufacturing
• Precision Hole Drilling & Thread Tapping (NPT/Metric)
• Explosion-Proof & Flameproof Design (Ex d / Ex e compliance)
• RFI/EMI Shielding Solutions
• Customized Internal Mounting Plates & BracketsMaterials • High-Grade Ductile Iron (EN-GJS-450-10 / 500-7) for impact resistance
• Quality Grey Cast Iron (HT250 / GG25) for high damping & shielding
• Corrosion-Resistant Alloyed Iron for marine/chemical environments
• High-Tensile Nodular Iron for heavy industrial loadingMachining Processes • CNC Milling of gasket grooves for perfect sealing (IP66/67/68)
• Multi-axis Drilling & Tapping for cable entries and glands
• Face Grinding for high-flatness cover seating
• Precision Boring for internal component fitting
• Deburring & Surface Cleaning for safe electrical handlingTarget Industries • Oil & Gas Refineries & Offshore Platforms
• Mining & Underground Tunneling Infrastructure
• Marine Shipbuilding & Port Terminals
• Chemical & Petrochemical Processing Plants
• Power Generation & Distribution Substations
• Heavy Manufacturing & Steel MillsSurface Treatment • High-Build Epoxy Coating for superior chemical resistance
• Hot-Dip Galvanizing for long-term corrosion protection in wet zones
• UV-Resistant Powder Coating (Custom RAL colors)
• Anti-Static Coatings for explosive gas environments
• Internal Phosphating for electrical insulation and rust preventionInspection Facilities • IP Rating Testing Rig (Water Ingress & Dust Protection)
• Hydrostatic Pressure Testing (Explosion-proof integrity check)
• CMM (Coordinate Measuring Machine) for hole center accuracy
• Spectrometer Analysis for material chemical certification
• Salt Spray Chamber for environmental durability testingOur Advantages 1. Superior Shielding: Natural EMI/RFI shielding properties of cast iron protect sensitive electronics.
2. Extreme Durability: Rugged construction withstands harsh impacts and corrosive industrial atmospheres.
3. Precision Seating: Zero-leakage gasket surfaces ensure long-term IP67/68 protection.
4. Full Customization: Tailored drilling and mounting options to meet specific project layouts.
5. Certified Safety: Engineered for explosive and hazardous area environments (Ex-rated).
Related Products
Let’s talk about your next project !
I don't have complete drawings, can I send inquiry?
Yes, we can help you analyze based on your description, samples and photos.
I am not sure if you can do my parts?
Most of our customers come to us because “others say they can’t do it”.
Are you a factory or a trader?
We are a factory and have a project management team that can handle the technology, cost and delivery at the same time.
Upload Your FilesGet a Quote NowSTEP STP SLDPRT IPT PRT SAT IGES IGS CATPART X_T OBJ STL files