Custom CNC Milling Services for Precision Metal & Plastic Parts
Get high-precision CNC milled parts with tight tolerances, fast lead times, and consistent quality — from prototyping to production.
- Fast Turnaround: 12–24 Hours
- Tight Tolerances up to ±0.001"
- 100+ Metals & Plastics, 50+ Finishes
- ISO 9001:2015 Certified
- Cost-Effective for Prototypes & Production
Advanced CNC Milling Capabilities for Complex Custom Parts
As a trusted manufacturer and supplier, we offer rapid prototyping and production parts with strict product quality and fast delivery time. Our CNC milling centers feature advanced 3-axis, 4-axis, and 5-axis and Swiss turning machines to handle complex projects. Explore our full CNC milling capability and get a quote today!
Our CNC Milling Materials
We are offering a wide range of CNC milling materials, from metal materials like aluminum, stainless steel, and brass to plastics like PEEK, nylon, and ABS, with 100+ materials options that are perfect for prototypes and production parts.
ABS
A tough, low-cost engineering plastic with excellent machinability, impact resistance, and dimensional stability. Commonly used for prototypes, enclosures, and automotive parts.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Delrin
Known for high strength, stiffness, and low friction, Delrin is ideal for precision parts like gears, bearings, and rollers requiring wear resistance and stability.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
HDPE
Lightweight and chemically resistant, HDPE is easy to machine and widely used for tanks, piping, and food-grade applications. It resists moisture and offers good impact strength.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
HDPE
More flexible than HDPE, LDPE is valued for its impact resistance and chemical inertness. Suitable for soft components, liners, and lightweight parts.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Nylon (PA)
A versatile engineering plastic with high mechanical strength, wear resistance, and good machinability. Commonly found in bushings, gears, and structural parts.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
PEEK
A high-performance, heat-resistant polymer with outstanding strength, chemical resistance, and dimensional stability. Ideal for aerospace, medical, and high-heat applications.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
PEI
An amber, high-strength plastic offering excellent heat resistance, flame retardancy, and electrical insulation. Often used in medical devices, aerospace, and electronics.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
PET
Offers excellent wear resistance, low moisture absorption, and good dimensional stability. Ideal for mechanical parts, food-safe applications, and precision components.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
PMMA
A lightweight, transparent plastic with good UV resistance and optical clarity. Frequently used for display cases, light covers, and optical components.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Polycarbonate
Exceptionally tough and transparent, polycarbonate offers high impact resistance and heat tolerance. Perfect for safety enclosures, protective covers, and medical equipment.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Polypropylene (PP)
Lightweight, chemically resistant, and cost-effective. Suitable for tanks, lab equipment, and applications requiring good chemical inertness.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Polystyrene
A rigid, lightweight plastic with good machinability and electrical insulation properties. Used for models, enclosures, and light-duty applications.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
PPSU
A tough, high-temperature plastic offering excellent hydrolysis resistance, ideal for medical, aerospace, and plumbing components requiring repeated sterilization.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
PSU
High heat resistance, good dimensional stability, and excellent chemical resistance make PSU suitable for fluid handling, medical, and electrical components.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
PTFE (Teflon)
Renowned for its non-stick surface, chemical resistance, and wide operating temperature range. Used for seals, gaskets, and parts needing low friction and high purity.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
PVC
A versatile, rigid plastic with good chemical resistance, flame retardancy, and cost-efficiency. Commonly used for piping, fittings, and industrial enclosures.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
PC
A durable, transparent thermoplastic with outstanding impact resistance, heat tolerance, and dimensional stability. Ideal for machine guards, housings, and optical covers.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
POM
A durable, transparent thermoplastic with outstanding impact resistance, heat tolerance, and dimensional stability. Ideal for machine guards, housings, and optical covers.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
PBT
An engineering thermoplastic with good dimensional stability, electrical insulation, and chemical resistance. Common in automotive connectors and electrical components.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
PPA
A high-performance nylon with elevated heat and chemical resistance, making it suitable for automotive, aerospace, and industrial fluid system parts.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
PAI
Offers exceptional strength, wear resistance, and high-temperature stability. PAI is used in demanding aerospace, semiconductor, and medical applications.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
PPS
A high-temperature, chemical-resistant plastic with excellent dimensional stability. Often used in automotive, electronics, and fluid handling systems.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
UPE
Extremely tough with outstanding wear and impact resistance. UPE is ideal for liners, wear strips, and parts exposed to abrasion and chemical exposure.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Bakelite
One of the first industrial plastics, Bakelite offers excellent electrical insulation, heat resistance, and rigidity. Common in electrical panels, switches, and legacy components.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
FR-4
A glass-reinforced epoxy material prized for its excellent mechanical strength, electrical insulation, and flame resistance. Widely used in PCB substrates and insulating applications.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Aluminum
Lightweight yet strong, aluminum offers excellent machinability, corrosion resistance, and thermal/electrical conductivity. Common grades like 6061 and 7075 balance cost and performance, while anodizing enhances surface durability, making aluminum ideal for aerospace, automotive, and electronic housings
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Brass
An easy‑machining copper–zinc alloy, brass provides good corrosion resistance, electrical and thermal conductivity, and a premium gold‑tone finish. Frequently used for decorative hardware, valves, gears, and fittings
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Copper
Pure, soft, and highly conductive, copper is favored for heat sinks, electrical contacts, and plumbing components. Its excellent machinability and thermal performance come at a higher cost due to raw material prices.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Stainless Steel
Stainless steels (types 303, 304, 316) offer superior strength, corrosion resistance, and aesthetic finish. Though harder to machine than aluminum or brass, it’s ideal for medical, marine, food‑grade, and architectural parts
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Steel Alloy
Alloy steels (e.g., 4140, 4340) are engineered for enhanced toughness, wear resistance, and load‑bearing capacity. Common in shafts, gears, and structural parts, they deliver strength but may require tougher tooling.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
metal Steel Mild (Low Carbon)
An economical and weldable choice, mild carbon steel offers reliable strength and toughness. It’s popular in general‑purpose parts and industrial applications, often surface‑treated to prevent rust.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Titanium
Known for its exceptional strength‑to‑weight ratio, toughness, and corrosion resistance, titanium excels in aerospace, medical, and high‑performance applications. Machinability is more challenging, requiring specialized tooling despite its premium benefits
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Bronze
Copper‑tin‑based bronze—especially aluminum or phosphor variants—is prized for wear resistance, strength, and corrosion resistance. Commonly used in bushings, bearings, gears, and marine components
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Zinc
Zinc and its alloys are easy to cast and machine, offering good corrosion resistance and dimensional accuracy. Ideal for die‑cast parts, fittings, and corrosion‑resistant components with fine detail.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Iron
Including grey and ductile iron, iron is valued for its strength, rigidity, wear resistance, and vibration damping. Commonly used in machinery frames, engine blocks, and heavy‑duty components.
Color:
Red
Price:
$ $ $
Lead Time:
<7 Days
Max Part Size:
2000×1500×300 mm
Min Part Size:
/
Tolerances:
±0.001 in
Why Choose ProleanMFG For Your Custom CNC Milling Services
Certified Premium Quality with Affordable Prices
Our strict quality control procedures, which include CMM inspection, dimensional reports, and material certifications upon request, ensure that every part meets your specifications and expectations.
And our ISO 9001:2015-certified machining processes guarantee precision CNC machined parts with tight tolerances, consistent accuracy, and excellent surface finishes, and we make sure all at an affordable price.
Fast Lead Times with Reliable Delivery
From rapid prototypes to production runs, we offer short lead times as fast as 1 day. Our efficient workflow and advanced 5-axis CNC machining centers keep your projects moving without delays.
Dedicated Engineering Support with Design Feedback
Upload your 2D drawings or 3D CAD files, and our skilled engineers will personally review your design, provide optimized pricing, and suggest adjustments to improve manufacturability and save costs.
From quotation to final delivery, our experienced support team is always available to assist with design advice, material recommendations, production updates, and post-delivery care.
Flexible Prototyping & Production Volumes
Whether you need a single prototype or large-volume production, we have no minimum order quantity (MOQ) and can handle orders of any size with equal care and precision.
Wide Material & Finish Selection
Choose from over 100+ metals and plastics, including aluminum, stainless steel, PEEK, nylon, and more. Available surface finishes include anodizing, powder coating, polishing, and electroplating.
Global Reach with Advanced Capabilities
We serve customers worldwide while providing personalized, responsive service to every client, ensuring you get reliable CNC machining solutions tailored to your specific needs.
CNC Milling Tolerances & Standards
At ProleanMFG, we maintain strict CNC milling tolerances to ensure every part meets precise dimensional and fit requirements. By default, we follow ISO 2768-m for metals and ISO 2768-c for plastics, ensuring consistent quality across prototypes and production parts.
If your project demands tighter tolerances, such as ±0.001 inches (±0.025 mm) or specific GD&T annotations, simply include these details in your drawings or contact our team, as we’re equipped to deliver the precision your application requires.
| Feature | CNC Milling | |
|---|---|---|
| Max Part Size | 2000×1500×300 mm (3 & 5 Axis) | |
| Min Part Size | 5×5×5 mm | |
| General Tolerance | Metal: ISO 2768-m Plastic: ISO 2768-c | |
| Precision Tolerance | ±0.001 in (±0.025 mm) achievable per drawing | |
| Min Wall Thickness | 0.5 mm | |
| Min Hole Size (Drill) | 1 mm | |
| Min End Mill Size | 0.5 mm | |
| Min Feature Size | 0.5 mm | |
| Surface Finish (Standard) | As machined: 125 Ra µin (3.2 µm) or better | |
| Surface Finishing Options | Anodizing, Powder Coating, Polishing, Sandblasting, Electroplating | |
| Threads & Tapped Holes | All standard thread sizes, custom threads upon request | |
| Production Volumes | Prototype: 1–100 pcs Low Volume: 101–10,000 pcs High Volume: 10,001+ pcs | |
| Lead Time | Standard: 3–5 business days Simple parts: as fast as 1 day |
Get More Tips With Our Complete Design Guide
Our CNC Milling Surface Finishing
ProleanMFG offers a range of CNC surface finishing options to improve both appearance and performance. Choose from 20+ finishes or request a custom solution.
 | As-Machined | The default finish with visible tool marks. Cost-effective for functional parts or prototypes where appearance is secondary. |
 | Fine Machining (Ra 0.8μm) | Offers a smoother, more refined finish than standard as-machined. Needed for parts with tighter tolerance & better aesthetics. |
 | Bead Blasting / Sand Blasting | Matte, uniform texture for improved surface look. Ideal for visual parts or preparation before painting/anodizing. |
 | Brushed Finish | Satin surface texture. Looks premium and hides fingerprints. |
 | Polishing | High-gloss mirror finish. Used where aesthetics or friction reduction matters. |
 | Anodizing (Type II & III) | Durable, corrosion-resistant oxide layer. Offers color and improved surface hardness. Type III provides harder coatings. |
 | Powder Coating | Thick, durable decorative coating. Offered in various gloss levels. |
 | Black Oxide | Provides a matte black corrosion-resistant finish. Low-cost and non-dimensional. |
 | Electroless Nickel Plating | Uniform coating even on complex geometries. Enhances corrosion resistance and wear protection. |
 | Electroplating (Nickel, Zinc, Silver, Gold) | Decorative + functional coatings. Enhances corrosion resistance and conductivity (e.g., silver/gold). |
 | Alodine (Chromate Conversion) | Prepares aluminum for painting, improves corrosion resistance without affecting electrical conductivity. |
 | Chem Film / Chromate Conversion Coating | Like Alodine, but a broader term. Preps surfaces for painting or adds light corrosion protection. |
Our Ordering Process
1
Upload Your CAD File
Securely upload your part design to our online system.
2
Select Specs & Lead Time
Choose your materials, finishes, and preferred delivery time to match your project needs.
3
Get a Fast CNC Quote
Without too much waiting, receive a fast, accurate quote for custom parts manufacturing.
4
Manufacturing/Production Begins Immediately
We assign the best-fit CNC milling centers and start rapid production of your parts.
5
Strict Quality Control
Every part passes through product quality checks to meet the International ISO standards.
6
Fast & Reliable Delivery
We make sure to deliver your precision CNC parts safely packaged and shipped on time.
What is CNC Milling and How Does it Work?
CNC milling is a subtractive manufacturing process using CNC mills, automated cutting machines with a rotating spindle head, to create precision custom-milled parts. Controlled by G-code, the machine removes material from metal or plastic blocks to produce prototypes and production parts with tight tolerances up to ±0.001 inches.
We offer CNC milling services with 3-axis, 4-axis, 5-axis, and 3+2-axis CNC mills for rapid prototyping and full-scale production. We are backed by skilled manufacturer suppliers, ensuring strict product quality and fast delivery time. Get your fast, free quote today!
Advantages of CNC Milling
High Precision: Achieve tight tolerances and consistent, high-quality CNC machined parts.
Fast Turnaround: Get custom-milled parts and prototypes in as fast as one day.
Complex Part Production: Easily handle intricate designs with 3, 4, 5, and 3+2 Axis CNC mills.
Material Versatility: Machine metals, plastics, and composites with ease.
Scalable & Repeatable: Perfect for both rapid prototyping and high-volume production with consistent results
Applications of CNC Milling
Rapid Prototyping: Produce functional prototypes quickly for product testing and development.
Rapid Tooling: Create precision molds, dies, fixtures, and tooling components for manufacturing.
End-Use Production Parts: Manufacture high-quality, custom-milled parts for final product assemblies.
Complex Geometries: Machine intricate shapes and multi-axis components with tight tolerances.
Low to High-Volume Production: Ideal for single prototypes, small batches, and large-scale production runs.
Precision Machining for Custom Components: Deliver highly accurate, custom parts across various material types.
CNC Milling Design Guidelines & Capabilities
Enhance the part quality, reduce production time, and design smarter with our CNC milling guidelines. Download the PDF now!
Industries We Are Serving
We partner with businesses in every industry to provide high-precision CNC-milled parts, from prototypes to full production runs. Whether it’s for automotive, aerospace, medical devices, or custom robotics, companies worldwide trust our CNC milling services for reliable, accurate & precise results.
Precision-machined parts for vehicle systems, EV components, and performance upgrades — built to meet industry safety and reliability standards.
High-performance, tight-tolerance parts for aircraft, drones, defense systems, and satellites, manufactured to aerospace-grade specifications.
Custom CNC components for surgical tools, diagnostic devices, and healthcare equipment, produced with medical-grade materials and ISO-certified processes.
Machined parts for robotic systems, end-effectors, and automation equipment — helping engineers bring next-gen technology to life.
Custom CNC parts for household products, lifestyle gadgets, and new product launches — combining quality, functionality, and cost-efficiency.
Electronics Industry
Precision housings, brackets, and electronic enclosures are machined to tight tolerances for consumer electronics and industrial devices.
Automation Industry
Reliable, high-precision components for assembly lines, automation systems, and industrial machinery — keeping production smooth and efficient.
New Energy
Custom CNC machined parts for renewable energy systems, battery technology, EV components, and power storage solutions, ensuring durability, precision, and performance for the future of energy
CNC Milling FAQ's
What kinds of CNC milling machining capabilities does ProleanMFG have?
At ProleanMFG, our CNC milling services cover a wide range of machining capabilities, including 3-axis, 4-axis, 5-axis, and 3+2-axis CNC milling. We specialize in producing precision custom-milled parts, rapid prototypes, and high-volume production parts with tight tolerances.
Our advanced CNC milling centers handle complex geometries and diverse materials, ensuring top product quality and fast delivery times.
What’s the difference between CNC milling, turning, and routing?
CNC milling uses rotating cutting tools and a moving workpiece to remove material, making it ideal for precision machining complex parts.
CNC turning, on the other hand, rotates the workpiece while a stationary tool shapes it, typically for cylindrical components.
CNC routers are mainly used for cutting softer materials like wood, plastics, and composites. In contrast, CNC milling services handle harder metals and deliver higher accuracy with tighter tolerances.
What types of materials do CNC mills use for parts manufacturing?
Our CNC milling services work with a wide variety of materials, including aluminum, stainless steel, titanium, copper, brass, plastics like ABS, nylon, PEEK, and engineering-grade composites.
This material versatility makes CNC milling suitable for industries like aerospace, automotive, medical, and electronics, offering reliable solutions for both rapid prototyping and production parts.
What is tool offset in CNC milling?
In CNC milling, a tool offset is the programmed adjustment between the cutting tool’s actual position and the theoretical position defined in the CNC machine’s G-code. It ensures precise control over cutting depth, positioning, and accuracy, compensating for tool size and wear during the machining process which is essential for producing tight-tolerance CNC machined parts.
What is 5-axis CNC milling?
5-axis CNC milling is an advanced milling process where the cutting tool moves across five different axes simultaneously X, Y, Z, and two rotary axes. This allows for the production of highly complex, multi-sided, precision components in a single setup, improving part accuracy and reducing lead times.
Our CNC milling services include 5 Axis CNC mills for complex aerospace, medical, and automotive parts.
How large are the fillets typically added when a 3D model or drawing does not specify a particular fillet size?
When a 3D model or technical drawing doesn’t specify a fillet size, CNC milling guidelines typically recommend adding a minimum internal fillet radius equal to the tool’s radius commonly around 1.0 mm to 3.0 mm (0.04” to 0.12”) depending on the part’s geometry and material. This improves tool access, reduces stress concentrations, and enhances product quality during precision machining.
What are the differences between vertical and horizontal CNC milling?
The main difference between vertical and horizontal CNC milling lies in the spindle orientation.
Vertical CNC milling machines have a spindle positioned vertically, moving up and down over the workpiece. They’re ideal for detailed surface work, prototypes, and small to medium-sized parts.
In contrast, horizontal CNC milling machines feature a spindle mounted horizontally, which allows for easier chip removal, and faster material removal rates, and is better suited for large, heavy parts or high-volume production.
Both types play a vital role in precision machining, and at ProleanMFG, our CNC milling services offer both options to match your project’s material, tolerance, and production requirements.
How much does your CNC milling service cost?
Costs vary by part design, material, quantity, and delivery speed. Upload your CAD file for a quick quote (Get a quote page link) with our dedicated engineers’ support. Contact Us Today (Contact Us Page Link).
