Online CNC Milling Service

Unionfab’s CNC milling service delivers fast turnaround for both prototypes and production runs.
Get an instant quote for your custom parts. We're ISO 9001:2015, ISO 13485, and AS9100D certified.

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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, AS9100D) ensure parts that meet your exact specifications. We adhere to strict quality control measures and keep you informed throughout the entire process.

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Unionfab CNC Milling Material Options

SteelStainless SteelAluminumTitaniumCopperPlasticsComposites
AISI 1018 SteelAISI 201 Stainless SteelAA2017 AluminumGrade 2 TitaniumC1100 CopperABSSynthetic stone (CDM)
AISI 1045 SteelAISI 303 Stainless SteelAA2024 AluminumGrade 6 Titanium Alloy (Ti-6Al-4V)C1020 CopperPCBakelite PF
AISI 1066 SteelAISI 304 Stainless SteelAA5052 AluminumC1200 CopperPEFR4 Epoxy Fiberglass
AISI 1140 SteelAISI 316 Stainless SteelAA5083 AluminumC2800 CopperPOMZrO2 Ceramic
AISI 4140 SteelAISI 316L Stainless SteelAA6061 AluminumC5210 CopperPMMA
A2 Tool SteelAISI 410 Stainless SteelAA6061-T6 AluminumC1720 CopperPP
D2 Tool SteelAISI 416 Stainless SteelAA6063 AluminumPolycarbonatePU
P20 Tool SteelAISI 420 Stainless SteelAA6082 Aluminum0PVC
H13 Tool SteelAISI 440C Stainless SteelAA7075 AluminumPA6/PA66
M2 Tool Steel17-4 PH Stainless SteelMIC-6 AluminumPTFE
YT15 Tungsten SteelPEEK
YT20 Tungsten SteelESD 225 POM Acetal
MC501CD R6

Unionfab CNC Milling Material Options


As-milled refers to the surface condition of a part immediately after machining with a milling machine. As-milled surfaces are often chosen for components that prioritize functionality and raw strength over aesthetics. At Unionfab, we can provide as-milled finishes with standard surface roughness (Ra) of 125uin (3.2μm). We also offer finer finishes down to 16uin (0.4μm) to meet your specific needs.

CNC Milling Applications

cnc machined car engine block


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.

cnc electronics enclosure


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.

medical cnc machining

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

CNC Milling Process

CNC milling excels at creating functional prototypes to validate your design and develop cost-effective production tooling (jigs, fixtures, molds) quickly. This reduces lead times and allows for rapid product development cycles.

Unionfab CNC Milling Tolerance Considerations

FeatureStandardAdvanced OptionNotes


±0.005" (±0.127mm)

±0.0005" (±0.0127mm)

Tolerances will be held to +/-.005"(+/-.127mm) in accordance with ISO 2768 unless otherwise specified.

Surface Roughness (Ra)

125uin (3.2μm)

Up to 16uin (0.4μm)

Surface roughness will be held to 125uin/3.2um Ra unless otherwise specified.

Lead Time

7-12 days

Contact us for advanced options.Get an instant quote to see the lead time.

Accepted File Formats

3D: STEP, STP, IGS 2D drawings: DWG, DXF, PDF

Contact us for specifics.

Delivery time may be 2-3 days longer if only 2D drawings are provided.


Standard Report (Free)

CMM Inspection or Third Party Inspection (Fee Required)

Free standard report, additional options available.

CNC Milling: Breakdown of the Basics

What is CNC milling?

CNC milling is a subtractive manufacturing process that uses computer numerically controlled (CNC) machines to remove material from a solid block to create a desired shape. A rotating cutting tool is used to precisely remove material according to a pre-programmed design.

CNC milling vs. turning: What are the differences?

Both CNC milling and turning are CNC machining processes, but they differ in how the material is moved. In CNC milling, the cutting tool moves around a stationary workpiece. In CNC turning, the workpiece rotates while the cutting tool remains stationary. Milling is suitable for creating complex shapes, while turning is ideal for creating cylindrical or hollow parts.

Types of CNC Milling Machines

3-axis CNC Milling Machines

These are the most common and widely used. They move the cutting tool along three linear axes:

  • X-axis (Left/Right)
  • Y-axis (Forward/Backward)
  • Z-axis (Up/Down)

3-axis CNC milling machines are generally more affordable and simpler to operate, making them suitable for various applications.

CNC Milling: Factors to Consider

If you're looking to outsource CNC milling for your project, here are some factors to consider:

  • Complexity of your part: Simpler parts can be machined on basic 3-axis machines, while intricate designs may require a multi-axis machine.)
  • Material: Different materials require specific tooling and expertise.
  • Tolerance requirements: The level of precision needed for your parts will influence the machine and expertise required.
  • Volume: Production volume will impact the choice of CNC milling machine and overall cost.