MACHINING CAPABILITY
3/4/5 AXIS
3-, 4-, and 5-axis CNC milling and gantry mill-turn machining for complex, tight-tolerance parts.
CUSTOM ONLINE CNC MILLING SERVICE
Precision CNC MillingGantry Mill-Turn Machining3-, 4- & 5-Axis
Partner with Unionfab, a China-based CNC milling company integrating in-house multi-axis manufacturing and vetted supplier networks, to get engineer-led DFM, verified quality, repeatable production, and assembly-ready parts.
Upload Your File, No Login Required
STEP | STP | IGS | DWG | DXF | PDF Files and More
CNC Milling Instant Quote
No MOQ • ISO 27001 Certified • Free DFM Analysis
Excellent4.7 out of 5
SPEED & PRECISION
±0.0002"
1-day turnaround with ultra-tight machining tolerances.
MANUFACTURING SCALE
400+
400+ Advanced CNC Machining Centers (Mazak, DMG MORI, Makino etc.) in 4 In-House Facilities
CERTIFIED
ISO
ISO 9001, 14001, 13485 & IATF 16949 certified with NDA-secured manufacturing workflows.
Why Choose Unionfab for Your CNC Milling Projects?
Advanced Capabilities
Our extensive infrastructure boasts over 400 advanced CNC machines across six strategically located facilities. We also boast a diverse selection of materials, ensuring we have the perfect fit for your specific project needs.
Industry-Proven Expertise
Our team boasts extensive experience in CNC machining and a deep understanding of its intricacies. From automotive to medical and beyond, our experience caters to diverse needs, ensuring project success in your specific field.
Streamlined Workflow
Our team boasts extensive experience in CNC, we prioritize efficiency at every step. Get competitive pricing and lead times within minutes with our online quote system. Additionally, our rapid prototyping capabilities help you validate your design and optimize production for cost-effectiveness.
More Affordable Than You Thought
Our CNC milling service is significantly more affordable than European and American competitors, boasting a cost reduction of 50%. This translates to substantial savings without sacrificing the quality or precision.
Commitment to Quality
At Unionfab, quality is paramount. Our ISO certifications (9001:2015, 13485, 14001) ensure parts that meet your exact specifications. We adhere to strict quality control measures and keep you informed throughout the entire process.
0+
CNC Centers
0
In-House Facilities
0+
Vetted Suppliers
0 Day
Turnaround
0M+
Parts Made
±0.0000"
Tight Tolerance
Visit Unionfab CNC Machining Factories Online
3 Axis Machining Factory
4 Axis Machining Factory
5 Axis Machining Factory
CMM Inspection Room
CNC Milling Materials
We provide a comprehensive range of CNC milling materials to meet the manufacturing demands of your most rigorous applications.
CNC Milling Metals
Choose from Unionfab's 60+ high-performance alloys including aluminum, stainless steel, brass, copper, titanium, and others for strong, precise, production-ready parts.
High StrengthTight TolerancesFunctional End-Use Parts
CNC Milling Plastics
Choose from Unionfab's engineering plastics such as ABS, PC, POM, nylon, PEEK, and acrylic for lightweight, insulating, and wear-resistant components.
LightweightElectrically InsulatingWear-resistant
CNC Milled Parts by Unionfab
CNC Milling Technical Specifications
| Limits for nominal lengths | ISO 2768-m (Default) | ISO 2768-f |
|---|---|---|
| 0.5mm to 3mm | ±0.1mm | ±0.05mm |
| Over 3mm to 6mm | ±0.1mm | ±0.05mm |
| Over 6mm to 30mm | ±0.2mm | ±0.1mm |
| Over 120mm to 400mm | ±0.5mm | ±0.2mm |
| Over 400mm to 1000mm | ±0.8mm | ±0.3mm |
| Over 1000mm to 2000mm | ±1.2mm | ±0.5mm |
| Over 2000mm to 4000mm | ±2.0mm | - |
While our instant quoting platform uses your 3D CAD files for geometric pricing, any custom dimensions, GD&T callouts, specific fits, or tight surface finishes MUST be explicitly detailed in an accompanying 2D PDF drawing.
Finishing Options for CNC Machining
A great part deserves a great finish. We offer a diverse selection of surface treatments to enhance the durability, functionality, and look of your CNC machined parts. Browse our capabilities below:
A mechanical surface treatment that bombards the part with fine glass beads at high pressure to remove tool marks and create a uniform, matte texture.
Best For:
Achieving a consistent, non-reflective aesthetic finish and hiding minor surface defects on consumer electronics, enclosures, or grip surfaces.
CNC Milling Applications
Automotive
CNC milling plays a central role in the automotive industry, shaping both the performance and appearance of vehicles from intricate engine blocks to the finely detailed elements within car interiors.
Electronics
CNC milling allows for the creation of delicate electronic parts and assemblies with the necessary level of detail and accuracy, ensuring the functionality and performance of the complex circuitry found within modern electronic devices.
Industrial Production
By combining rapid prototyping, rapid tooling, and end-use production, CNC milling offers a streamlined and efficient solution. It offers a one-stop shop, streamlining your journey from concept to production.
CNC Milling: Pros and Cons
Fast prototyping and tooling
CNC milling is well suited for functional prototypes, jigs, fixtures, and molds, helping shorten lead times and speed up product development.
High upfront costs
CNC milling can involve higher setup, machine, and tooling costs, especially for low-volume or simple parts.
Ability to produce complex designs
CNC milling can create intricate geometries and detailed features that are difficult to achieve with traditional manual machining.
Requires specialized programming
Accurate CNC machining depends on skilled CAD/CAM programming and process planning, which can add time and complexity.
High precision and repeatability
CNC machines can produce parts to exact specifications with tight tolerances, making them ideal for components that require reliable fit and function.
Material and design limitations
Although CNC milling supports many materials, some materials, deep cavities, thin walls, or highly complex internal features may be difficult or costly to machine.
Quality Assurance & Inspection
We adhere to a strict multi-stage inspection protocol to ensure every part meets your exact specifications.
Every order includes a First Article Inspection report (upon request).
We utilize state-of-the-art CMM (Coordinate Measuring Machines), profilometers for surface roughness, and calibrated hand tools.
All material certifications and heat treatment reports are archived and available for audit.
Our quality systems are aligned with international ISO 9001 standards, covering dimensional, geometric (GD&T), and material requirements.
For more details on our quality standards, check out our Inspection Checklist (including both standard and premium options).
FAQs About CNC Milling
We accept both 3D models and 2D drawings. For instant geometry analysis and baseline pricing, please upload your 3D CAD files in STEP, STP, or IGS formats. If your part requires specific tight tolerances, GD&T callouts, or threaded holes, a supplementary 2D drawing in PDF, DWG, or DXF format is required.
We have no strict Minimum Order Quantity (MOQ = 1). Whether you need a single rapid prototype for design validation or a low-volume production run of thousands of parts, our flexible manufacturing network is built to scale with your project efficiently and cost-effectively.
Our standard manufacturing lead time for most CNC projects is 5 business days. For exceptionally simple parts or urgent prototyping needs, we can expedite production and ship in as fast as 1 day. (Please note: Lead times may vary depending on part complexity, total quantity, and any secondary surface finishes required.)
100% Yes. We take intellectual property (IP) protection and data security incredibly seriously. We are proudly ISO 27001 Certified for information security management. Your files are encrypted and shared exclusively with essential engineering staff. We are also fully prepared to sign your Non-Disclosure Agreement (NDA) before you share any CAD files.
Absolutely. By default, every order includes a standard Dimensional Tolerance Report. For production volume orders, we supply comprehensive First Article Inspection (FAI) reports. If your critical components require ultra-precision metrology, full CMM (Coordinate Measuring Machine) inspection is available for an additional fee.
For a deep dive into our quality control processes, please read our guide on Unionfab QC & Inspection Capabilities.
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