CNC Metalworking | Precision CNC Machining & Heavy Fabrication

About CNC Metalworking

CNC Metalworking, operated by Openex, is a full-service, one-stop contract manufacturing company specializing in custom large machined parts and metal fabrications. We deliver precision-engineered solutions for the most demanding industrial applications.

With over 1,000 advanced manufacturing facilities and decades of expertise, we provide end-to-end services including CNC machining, heavy welding, plate rolling, hydraulic pressing, and full QA testing — all under one roof.

One-stop manufacturing from prototype to production
ISO-compliant quality assurance & inspection
Global delivery with export-ready packaging

Our Manufacturing Capabilities

From raw material to finished product, we offer a comprehensive suite of precision metalworking services.

Large CNC Turning

High-precision turning of large-diameter components with tight tolerances and superior surface finishes.

• Max diameter: 5000mm
• Max length: 15,000mm
• Materials: Steel, Stainless, Alloy

Large Parts CNC Milling

Multi-axis milling for complex geometries and large-scale industrial parts.

• 5-axis and 3-axis capabilities
• Max work envelope: 10m x 4m x 3m
• High-speed & heavy-duty options

Cutting Technologies

Advanced cutting methods including laser, plasma, waterjet, and robotic beveling.

• Laser: up to 30mm thickness
• Waterjet: 200mm max
• Robotic contour beveling

Heavy Welding

Certified welding of large structures and pressure vessels using MIG, TIG, SMAW, and SAW.

• ASME, AWS, ISO 3834 certified
• NDT: RT, UT, PT, MT
• Up to 200mm plate thickness

Plate Rolling

Cold rolling of thick plates up to 200mm thickness and 5000mm width.

• Diameter range: 800mm – 10,000mm
• Conical & cylindrical rolling
• Post-rolling welding & NDT

Hydraulic Pressing

High-force pressing and forming up to 100mm thickness with precision tooling.

• Max force: 5000 tons
• Custom die design
• Bending, punching, forming

Our Precision Metal Products

We manufacture high-value, complex assemblies for critical industrial applications worldwide.

Tube Sheets

Precision-drilled and machined tube sheets for heat exchangers, boilers, and pressure vessels.

• Hole tolerance: ±0.05mm
• Materials: Carbon, Stainless, Alloy
• Max size: 4000mm diameter

Vacuum Chambers

High-integrity welded and machined vacuum chambers with leak-tight seals.

• UHV compatible
• Full NDT & helium leak tested
• Custom flange configurations

Large Flanges

Forged and machined flanges up to 6000mm diameter for pipeline and vessel connections.

• ASME B16.5 / B16.47 compliant
• RT & UT inspected
• Raised face, RTJ, flat face

Pressure Vessels

ASME-certified vessels with full documentation and hydrostatic testing.

• Design to PED/ASME
• Up to 100 bar operating pressure
• Thermal stress relieving

Wind Turbine Hubs

Massive cast and machined hubs for offshore and onshore wind energy systems.

• 10+ tons per unit
• Precision bore alignment
• Fatigue-resistant design

Machine Frames

Heavy-duty welded and stress-relieved frames for industrial machinery.

• Finite element analysis
• Vibration damping
• Precision mounting surfaces

Dump Bodies

High-strength fabricated dump bodies for mining and construction equipment.

• Abrasion-resistant liners
• Hydraulic tilt mechanisms
• Custom volume & geometry

Steel Enclosures

Custom-engineered enclosures for electrical, mechanical, and safety applications.

• IP54 to IP68 ratings
• Powder coating & painting
• Seismic & blast resistant

Rolled Cylinders

Precision-rolled and welded cylinders for tanks, rollers, and structural use.

• Diameter: 500–6000mm
• Length: up to 15m
• Post-weld heat treatment

Industries We Serve

Our precision metal components power critical operations across global industries.

Oil & Gas

Pressure vessels, flanges, piping, and offshore structures.

Mining

Dump bodies, wear plates, structural chassis, and heavy equipment.

Aerospace

Precision frames, enclosures, and structural components.

Renewable Energy

Wind turbine hubs, towers, and solar tracking structures.

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Heavy Fabrication. Massive Scale. Extreme Precision.