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Custom CNC Milling Rapid Prototyping to Custom Production

We provide custom CNC milling services from rapid prototyping to small-batch and full-scale production. With tight tolerances and a wide range of metals and plastics, we help you get fast, accurate, and scalable CNC milling solutions tailored to your project. We turn your designs into high-precision components with consistent repeatability, helping you shorten development cycles and move smoothly from prototype to production.

3 Axis CNC Milling

3-Axis CNC Milling is a type of computer-controlled machining process where the cutting tool moves along three axes: X, Y, and Z. It’s one of the most common types of CNC milling and is widely used for producing precision parts

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4 Axis CNC Milling

4-Axis CNC Milling is an advanced CNC machining process where the cutting tool moves along the standard three linear axes (X, Y, Z) plus a fourth rotational axis (A-axis). The A-axis allows the workpiece or tool to rotate, enabling machining of more complex shapes that can’t be done on a 3-axis machine.

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5 Axis CNC Milling

5-Axis CNC Milling allows the cutting tool to move in five directions at the same time, enabling the production of highly complex, tight-tolerance parts in a single setup. It’s ideal for advanced industries needing precision, smooth surfaces, and efficient machining

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From CNC Milling Prototyping to Production

Our custom CNC milling services support your entire manufacturing process—from rapid CNC prototyping to scalable small-batch and full production. With advanced multi-axis machining, tight-tolerance capabilities, and CAD/CAM-driven precision, we deliver high-quality metal and plastic CNC milled parts with consistent repeatability and fast turnaround.

On-Demand Production

Our On-Demand Production allow you to Low MOQ order exactly what you need,we deliver precision cnc machined parts with flexible quantities and fast lead times 1-3 working days.

Delivery time:

Typically delivered within 1–3 business days.

Rapid Prototyping

Yumei provide fast, accurate, and cost-effective rapid prototyping solutions to your projects,which help you achieve faster market entry with much lower cost.

Delivery time:

Simple parts (around10pcs): about 5–7 days
Medium-complexity parts ( hundreds of pieces): about 7–15 days
Complex or high-precision parts (multi-process): about 25–30 days
Parts requiring surface treatments (anodizing, plating, painting, etc.): need additional 2–7 days.

Bridge Production

Bridge Production fills the gap between prototyping and mass production, offering small and medium runs with stable quality and fast delivery. Ideal for market testing, pre-production builds, and early product launch before full-scale manufacturing.

Delivery time:

The standard lead time is 25–30 days,for complex designs or special materials，requires additional time.

If you have a specific delivery schedule, we can prioritize production or ship in batches as needed. Welcometo share your requirements and we will arrange the most suitable plan for you.

Materials for Custom CNC Milling Parts

From plastic to metal processing, we offer a wide selection of CNC machining materials for your custom part fabrication.
We offer a full range of CNC machining materials—from plastics to metals,you can choose the right material for your custom parts.

Metals Machining

Plastics Machining

Aluminum

Color：

Silver-white

Subtypes：

Aluminum 6061,6061-T6 Aluminum 2024, Aluminum 5052Aluminum 5083, Aluminum 6063, Aluminum 6082, Aluminum 7075,7075-T6, Aluminum ADC12 (A380)

Available Finish：

Anodizing Types II: 5-25 μm coating thickness, 16 color options
Type III (Hardcoat): 25-50+ μm thickness, Hardness 60-70 Rockwell C
Powder coating: 75-125 μm thickness, 2,000+ color options
Bead Blasting: 150-600 grit media for controlled surface texture
Plating: 5-25 μm thickness, Hardness 48-52 Rockwell C

Brass

Color：

Yellow

Subtypes：

Brass C27400, Brass C28000, Brass C36000

Available Finish：

Polishing: Creates a smooth, glossy surface finish, ideal for decorative products and high-visibility products.
E-plating: Forms an effective corrosion-resistant protective layer via galvanizing, nickel plating, chrome plating, etc.
Anodization: Enhances corrosion resistance and adds color.
Passivation: Effectively inhibits oxidation of brass parts, extending their service life in harsh operating conditions.

Copper

Color：

Reddish-brown

Subtypes：

Copper C101(T2), Copper C103(T1), Copper C103(TU2), Copper C110(TU0), Beryllium Copper

Available Finish：

Polishing: Creates a smooth, glossy surface finish, ideal for decorative products and high-visibility products.
E-plating: Forms an effective corrosion-resistant protective layer via galvanizing, nickel plating, chrome plating, etc.
Anodizing: Enhances corrosion resistance and adds color.
Passivation: Effectively inhibits oxidation of brass parts, extending their service life in harsh operating conditions.

Magnesium

Color：

Light Silver-white

Subtypes：

Magnesium Alloy AZ31B, Magnesium Alloy AZ91D

Available Finish：

Anodizing: Forms a dense and hard oxide layer (magnesium oxide) on the surface to improve corrosion resistance and wear resistance. It can also be dyed in various colors such as black or gray.
E-plating: Forms an effective corrosion-resistant protective layer via galvanizing, nickel plating, chrome plating, etc.
Polishing: Creates a smooth, glossy surface finish, ideal for decorative products and high-visibility products.
Passivation: Effectively inhibits oxidation of brass parts, extending their service life in harsh operating conditions.

Steel

Color：

Silver-gray

Subtypes：

Steel1018,1020,1025,1045,1215,4130,4140,4340,5140,A36, Die steel, Alloy steel, Chisel tool steel, Spring steel, High speed steel, Bearing steel, Cold rolled steel, SPCC

Available Finish：

Anodizing: Forms a dense and hard oxide layer (magnesium oxide) on the surface to improve corrosion resistance and wear resistance. It can also be dyed in various colors such as black or gray.
E-plating: Forms an effective corrosion-resistant protective layer via galvanizing, nickel plating, chrome plating, etc.
Powder Coating: It offers strong durability and allows for a wide range of color and texture selections.
Heat Treatment:Uses controlled heating and cooling cycles to enhance the metal’s mechanical properties. This process increases hardness, improves strength

Stainless Steel

Color：

Silver-gray

Subtypes：

Stainless SteelSUS201, Stainless SteelSUS303, Stainless SteelSUS 304, Stainless SteelSuS316, Stainless SteelSUS420, Stainless SteelSUS430, Stainless SteelSuS431, StainlessSteelSUS440C, Stainless SteelSUS630/17-4PH, Stainless SteelAlS1304, Stainless SteelSUS316L

Available Finish：

Polishing: Creates a smooth, glossy surface finish, ideal for decorative products and high-visibility products.
Powder Coating: It offers strong durability and allows for a wide range of color and texture selections.

Titanium

Color：

Silver

Subtypes：

Titanium Alloy TA1, Alloy TA2, Alloy TC4/Ti-6Al 4V

Available Finish：

As machined, Polishing, Sand Blasting, Tumbling, Electropolish, Alodine, Anodizing, Electroless nickel, Painting, Powder coating, Brushed finish

ABS

Color：

Black,White

Subtypes：

ABS Beige(Natural)ABS Black, ABS Black Antistatic, ABS Milky White, ABS+PC Black, ABS+PC White

Available Finish：

Sanding：Remove obvious machining marks for a smooth surface
Painting：Color matching or applying a coating to enhance product appearance.
Vapor Polishing： Solvents can smooth transparent ABS and make it glossy.
Texturing： Add patterns or textures to increase friction and enhance a refined feel.

Acetal

Color：

Dark brown(coffee),Black,Blue,White

Subtypes：

Dark brown (coffee)POM 100AF, POM Black, POM Blue, POM White

Available Finish：

Machined Finish：CNC machining provides a standard surface finish.
Bead Blasted Finish：Creates a textured surface to improve grip and feel.
Polished Finish：Produces a smooth and glossy finish.

HDPE

Color：

Black, White

Subtypes：

HDPE Black, HDPE White

Available Finish：

Because HDPE parts are generally difficult to coat, they are often left in their machined state. Various CNC machining methods—such as milling, turning—along with suitable post-processing options, can produce different surface finishes.

Nylon PA

Color：

Blue,Black,White,Beige

Subtypes：

PA(Nylon) Blue, PA6 (Nylon)+GF15 Black, PA6 (Nylon)+GF30 Black, PA66 (Nylon) Beige(Natural), PA66 (Nylon) Black

PEEK

Color：

Beige,Black

Subtypes：

PEEK Beige(Natural), PEEK Black

Available Finish：

Machined Finish: CNC machining provides a standard surface finish.
Bead Blasted: Creates a textured surface to improve grip and feel.
Polished: Makes the surface smoother, improving appearance and reducing friction.
Coated: Enhance wear resistance and lower friction.

Phenolic

Color：

Black,Red

Subtypes：

Phenolic black,Phenolic red

Available Finish：

As machined, Painting, Powder coating, Brushed finish

Polycarbonate

Color：

White

Available Finish：

as-machined: retain the obvious lines left by the tools and machine tools during the machining process.
Vapor Polishing:Vaporize solvents to act on the surface, smoothing it for enhanced material transparency.
Bead Blasting:Creates a matte texture while eradicating minor blemishes.
Painting: Adds many colors to the product and forms a protective coating, enhancing appearance and extending service life.
Laser Engraving:Engraves logos or customized patterns on the workpiece surface.
Anodizing:Effectively enhances the workpiece's corrosion resistance.

PVC

Color：

Black,White

Available Finish：

Painting/Coating: Enhance aesthetics (color customization) and add a protective layer against scratches.
Polished: Makes the surface smoother, improving appearance and reducing friction.
Texturing： Add patterns or textures to increase friction and enhance a refined feel.

CNC Milling Services Tolerances CNC

Yumei’s CNC milling services maintain precision tolerances and consistent accuracy,our standard tolerances for CNC milled metals is ISO 2768-m and ISO 2768-c for plastics,our cnc machined parts even can reach to 0.01 mm depending on the material, geometry, and machining process.

Permissible deviations in mm for ranges in nominal lengths	Tolerance class:designation (description)
Permissible deviations in mm for ranges in nominal lengths	f (fine)	m (medium)	c (coarse)
Linear Dimensions
0.5 up to 3	±0.05	±0.1	±0.2
over 3 up to 6	±0.05	±0.1	±0.3
over 6 up to 30	±0.1	±0.2	±0.5
over 30 up to 120	±0.15	±0.3	±0.8
over 120 up to 400	±0.2	±0.5	±1.2
over 400 up to 1000	±0.3	±0.8	±2.0
over 1000 up to 2000	±0.5	±1.2	±3.0
over 2000 up to 4000	-	±2.0	±4.0
External Radius and Chamfer Heights
0.5 up to 3	±0.2	±0.2	±0.4
over 3 up to 6	±0.5	±0.5	±1.0
over 6	±1.0	±1.0	±2.0
Angular Dimensions
up to 10	±1º	±1º	±1º30'
over 10 up to 50	±0º30'	±0º30'	±1º
over 50 up to 120	±0º20'	±0º20'	±0º30'
over 120 up to 400	±0º10'	±0º10'	±0º15'
over 400	±0º5'	±0º5'	±0º10'

Surface Finishing for CNC Milling Machining CNC

Pursuing the ideal and tailored surface finish ? Let's explore over 20 solutions to fulfill your functional and aesthetic needs.

As Machined

Ra 3.2μm / Ra 126μin
Removes sharp edges and burrs

Anodizing

Forms an oxide layer on the surface of metals (e.g., aluminum, magnesium) to provide durability and corrosion resistance.

Polishing

Ra 0.2μm / Ra 8μin
Makes the surface smoother, improving appearance and reducing friction.

Sand Blasting

Ra 3.2μm / Ra 126μin
Removes sharp edges and burrs

Uses high-speed abrasive particles to strike the surface and remove rust, old coatings, oxides, and impurities.

Brushed Finish

Forms uniform, fine linear textures on metal or other materials through mechanical processing, creating a satin finish that is resistant to fingerprints.

Powder Coating

Uses powder coatings for a dry finishing process, offering strong durability and allows for a wide range of color and texture selections.

Conventional Spray

Delivers uniform, fine-grained coverage for diverse surfaces. Easy to apply, fast-drying, and reliable—ideal for professional finishing, household touch-ups, and industrial coating needs. A trusted choice for consistent, smooth results.

Electroplating

Forms a dense, corrosion-resistant metal coating—such as through galvanizing, nickel plating, or chrome plating—by reducing dissolved metal cations using electric current.

Black Oxidize

Ra 3.2μm / Ra 126μin
Removes sharp edges and burrs

Uses high-speed abrasive particles to strike the surface and remove rust, old coatings, oxides, and impurities.

Electropolish

Removes micro-burrs and impurities from metal surfaces using electrochemical principles.

Alodine

Custom aluminum bike parts anodized finish

Immerses aluminum in a chromate solution to form a thin, dense conversion coating that improves corrosion resistance and enhances paint or coating adhesion.

Heat Treatment

Uses controlled heating and cooling cycles to enhance the metal's mechanical properties. This process increases hardness, improves strength

Smooth Machining

Ra 1.6μm / Ra 63μin

Fine Machining

Ra 0.8μm / Ra 32μin

Why Choose Us for CNC Milling Service

Yumei delivers end-to-end CNC milling solutions with advanced multi-axis machines, a wide range of materials, and tight-tolerance capabilities. From rapid prototyping and bridge production to full-scale manufacturing, we provide precise, consistent, and customizable parts at any stage of your project.

Instant quotation

You will provide a quick quotation within 3-5 hours during working days after receiving your design with detailed specifications,materials,surface treatments and quantities

High quality

As an ISO 9001 and IATF 16949 certified company,we ensure the quality of our processes and final deliverables always meet your expectations,our precision inspection equipments provide comprehensive inspection from basic measurement to high-precision standard,ensuring the accuracy and quality stability of the product.

On-time, fast delivery

Yumei is equipped with 150+ sets of manufacturing devices,our custom CNC milling delivers rapid turnaround and quick delivery of high-precision metal and plastic components in a few days.

Quick reaction with 24/7 online support

Yumei provides 24-hour/7 days online support to ensure that your doubts can be solved immediately.

CNC Milled Parts Customer Cases

Yumei helps customers across industries like aerospace, automotive, medical, ectronics, robotics, new energy achieive faster market entry,lower cost of ownership,flexible operation by providing high-quality CNC milled parts—from prototypes to production runs.

Specialist Industries

We specialize in precision processing services of CNC turning, CNC milling, Automatic Lathe, Sheet Metal Fabrication and Cold Forging, our manufacturing processes ensure that each and every one of our customers receives a comprehensive solution for any need they may have.

Our parts are widely used in the industries like Aerospace, Automotive, Medical devices, Optics, Motorcycle, Electronics, Machinery and so on. No matter how complicated your project may be, we can produce what you need.

With more than 150 processing equipments, over 1000 customer cooperation cases; 16+ years of industry experience,over 98% of the qualified rate,our products proudly reach over 120 countries worldwide,our customer satisfaction reach above 95%.

Aerospace

Automotive

Medical

Energy

Motorcycle

Electronic

Robot

Semiconductor

CNC Milling Quality Control

In-Production

At key machining stages, in-process inspections are carried out to ensure production stability. These include first article inspection, routine patrol inspections, real-time monitoring of critical dimensions, tool condition checks, machining parameter monitoring, and sampling inspections. This process helps to identify issues early and prevent defects from flowing into the next production stage.
All inspections are conducted in strict accordance with the requirements of ISO 9001:2015. Quality inspectors perform routine checks on all production parts every two hours to effectively prevent potential risks.

Post-Production

Full dimensional inspection or sampling inspection. If required by the customer, we can perform 100% dimensional inspection using CCD measurement systems, achieving a pass rate of up to 99%. Additionally, we provide 100% full appearance inspection, which is one of our unique strengths.
According to customer requirements, we conduct further tests such as coating thickness measurement, surface roughness testing, and hardness testing.
Outgoing Inspection:Before packaging, a final confirmation is carried out, including Verification of product quantities, Packaging integrity check, Random re-inspection。Our packaging solutions are tailored to customer requirements and the specific characteristics of each product. We offer a variety of packaging methods, including individual packaging, tray packaging, foam or sponge insert packaging, vacuum packaging, bulk packaging, and customized wooden crate packaging..

Precision measuring tools

CMM Testing — dimensional accuracy measurement

Coating Thickness Testing — coating thickness check

Film Thickness Test — film/plating thickness measurement

Surface Roughness Test — surface finish evaluation

Hardness Test — material hardness assessment

Projector Test — profile and key dimension inspection

Salt Spray Test — corrosion resistance testing

ISO and other certifications

Our company is certified to ISO 9001:2015, ISO 14001:2015, and IATF 16949:2016, providing strong institutional assurance for production stability and consistent quality.

Continuous improvement

We regard continuous improvement as the long-term core of quality management, constantly reviewing and optimizing manufacturing processes. We achieve comprehensive enhancements across process parameters, equipment efficiency, and inspection methods.

Continuous improvement

CNC Milling FAQs

A: CNC milling is a subtractive manufacturing process that uses computer-controlled cutting tools to remove material and create precise parts from metal or plastic materials.

A: Common materials include aluminum, steel, stainless steel, brass, copper, titanium, ABS, PC, POM, Nylon, and other engineering plastics.

A: Our standard tolerances for CNC milled metals is ISO 2768-m and ISO 2768-c for plastics,our cnc machined parts even can reach to 0.01 mm depending on the material, geometry, and machining process.

A: Available finishes include anodizing, powder coating, painting,sandblasting, polishing, brushing, electroplating, laser engraving, passivation, and more.

A: We accept STEP, STP, IGES, IGS, STL, PDF, and other common 2D/3D CAD files.

A: Lead time typically ranges from 3–7 days depending on part complexity and quantity. Rapid prototypes can be delivered even faster.

A: Yes. We support rapid prototyping, bridge production, and full-scale manufacturing.

A: We provide 3-axis, 4-axis, and 5-axis CNC milling for complex geometries, tight tolerances, and multi-surface machining.

A: We perform full inspections from raw material come in to pre-shipment by using precision measurement tools such as CMM,projector,height gauge,etc,dimensional and mechanical inspection strictly follow the standard GB/T 2828.1-2012,100% full inspection on appearance,which leaves you with no concerns about quality issues.

A: Yes. We offer surface finishing, heat treatment, logo engraving, and assembly upon request.

Custom Online CNC milling Services

Custom CNC Milling Rapid Prototyping to Custom Production

3 Axis CNC Milling

4 Axis CNC Milling

5 Axis CNC Milling

From CNC Milling Prototyping to Production

On-Demand Production

Delivery time:

Rapid Prototyping

Delivery time:

Bridge Production

Delivery time:

Materials for Custom CNC Milling Parts

Aluminum

Brass

Copper

Magnesium

Steel

Stainless Steel

Titanium

ABS

Acetal

HDPE

Nylon PA

PEEK

Phenolic

Polycarbonate

PVC

CNC Milling Services Tolerances CNC

Surface Finishing for CNC Milling Machining CNC

As Machined

Anodizing

Polishing

Sand Blasting

Brushed Finish

Powder Coating

Conventional Spray

Electroplating

Black Oxidize

Electropolish

Alodine

Heat Treatment

Smooth Machining

Fine Machining

Why Choose Us for CNC Milling Service

CNC Milled Parts Customer Cases

Specialist Industries

Aerospace

Automotive

Medical

Energy

Motorcycle

Electronic

Robot

Semiconductor

CNC Milling Quality Control

In-Production

Post-Production

Precision measuring tools

ISO and other certifications

Continuous improvement

Continuous improvement

CNC Milling FAQs

Q: What is CNC milling?

Q: What materials can be CNC milled?

Q: What tolerances can you achieve?

Q: What surface finishes are available?

Q: What file formats do you accept?

Q: What is your standard lead time?

Q: Can you produce both prototypes and production parts?

Q: What CNC milling capabilities do you offer?

Q: How do you ensure quality?

Q: Do you offer finishing and assembly services?

CNC Milling Resources

5-Axis CNC Machining Services for Complex Parts

3-Axis vs 4-Axis vs 5-Axis CNC Machining Process

CNC Machining Process: From CAD to Finished Parts

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