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CNC Machining Services in China
Get High Quality CNC Machined Parts From Trusted Chinese Manufacturer.
The CNC Machining Services HFJ Offers you
Looking for a reliable and quick-turn provider of CNC machining services from China?
HFJ is your trusted partner for precision CNC machining, delivering fast, consistent, and high-quality manufacturing solutions. With advanced CNC equipment and a team of experienced engineers, we turn your designs into reality—on time and to spec.
From rapid prototyping to low- and high-volume production, we offer tight-tolerance machining across a wide range of materials including aluminum, stainless steel, brass, and engineering plastics. Serving industries such as automotive, aerospace, medical, and electronics, we’re committed to providing seamless, end-to-end support that keeps your projects moving forward.
CNC Milling Service
3-axis, 4-axis, and 5-axis CNC machining services to precisely manufacture both simple and highly complex parts, tailored to your design and performance needs.
CNC Turning Service
CNC turning with live tooling integrates turning and milling operations, enabling efficient machining of complex parts with both cylindrical and milled features.
What's CNC Machining Service?
CNC (Computer Numerical Control) machining is a manufacturing process that uses automated, computer-controlled tools to precisely remove material from a workpiece. It’s ideal for producing highly accurate and repeatable parts in metals, plastics, and other materials.
CNC machining services typically include milling, turning, drilling, and other operations—making it a versatile solution for everything from prototypes to full-scale production. With fast turnaround, tight tolerances, and consistent quality, CNC machining is widely used across industries such as aerospace, automotive, medical, and electronics.
High Precision CNC Machined Parts
High precision CNC machined parts are components manufactured using advanced CNC (Computer Numerical Control) machines to achieve extremely tight tolerances and exceptional accuracy—often within microns. These parts are designed for critical applications where even the slightest deviation can affect performance.
CNC machined parts can achieve very tight tolerances, depending on the machine capabilities, material, and part complexity. In general:
Standard tolerance: ±0.1 mm (±0.004 inch)
Tight tolerance: ±0.01 mm (±0.0004 inch)
Ultra-precision (with specialized equipment): ±0.005 mm (±0.0002 inch) or better
Tolerances may vary depending on factors such as material stability, machining process (milling vs turning), and part geometry. For mission-critical industries like aerospace or medical, ultra-tight tolerances are often required.
Advantages of HFJ's CNC machining Services
01 Precision & Consistency
Equipped with advanced 3-axis, 4-axis, and 5-axis CNC machines, HFJ delivers tight-tolerance parts with exceptional dimensional accuracy and repeatability.
02 Fast Turnaround Time
Streamlined production processes and a responsive team ensure quick prototyping and on-time delivery, helping clients accelerate their product development cycles.
03 Material Versatility
Capable of machining a wide range of metals and plastics—including aluminum, stainless steel, brass, POM, and more—to meet diverse industry needs.
04 Comprehensive Surface Finishing
A variety of surface treatment options are available, including anodizing, sandblasting, polishing, plating, painting and more—enhancing both appearance and functionality.
05 Assembly Services
HFJ supports multi-part assembly, offering customers a one-stop solution from precision machining to functional sub-assembly, saving time and cost.
06 Strict Quality Control
Every part is produced under rigorous inspection protocols to ensure it meets international quality standards and customer specifications.
07 Industry Experience
Serving industries such as automotive, medical, aerospace, electronics, and automation—with tailored solutions for both prototyping and volume production.
Our Precision CNC Machined Parts
Many featured custom products are not shown on the website due to signing NDAs with customers.
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CNC Machining Materials
From aluminum and steel to brass and plastics, we’ve got a wide selection of CNC materials for your custom parts.
Metals
Aluminum is one of the most popular materials for CNC machining due to its excellent machinability, lightweight nature, and resistance to corrosion.
Key Advantages:
Lightweight yet strong
Excellent thermal and electrical conductivity
Good corrosion resistance
Suitable for anodizing and surface treatments
Cost-effective for both prototypes and volume production
Common Grades:
6061 – General-purpose, great strength-to-weight ratio
7075 – High strength, ideal for aerospace and high-performance parts
Applications:
Used in aerospace, automotive, electronics, robotics, and medical components.
Stainless steel is a strong, corrosion-resistant material ideal for CNC machining applications that require durability, high strength, and a clean finish.
Key Advantages:
Excellent corrosion and wear resistance
High strength and hardness
Maintains structural integrity in harsh environments
Suitable for polishing, brushing, or passivation
Ideal for functional and aesthetic parts
Common Grades:
304 – General-purpose stainless steel, corrosion resistant and affordable
316 – Superior corrosion resistance, especially for marine/chemical applications
303 – Better machinability while maintaining strength
Applications:
Widely used in medical devices, food-grade equipment, automotive parts, aerospace, and industrial components.
Steel is a widely used material in CNC machining due to its strength, toughness, and versatility across industrial applications.
Key Advantages:
High tensile strength and durability
Suitable for heat treatment and hardening
Excellent structural stability under load
Available in a wide range of grades for various applications
Cost-effective for functional, heavy-duty parts
Common Grades:
Mild Steel (1018, 1020) – Easy to machine, economical
Alloy Steel (4140, 4340) – High strength, wear-resistant
Applications:
Used in automotive shafts, gears, brackets, structural frames, tooling components, and heavy-duty mechanical systems.
Brass is a copper-zinc alloy known for its excellent machinability, attractive appearance, and corrosion resistance—making it a popular choice in CNC machining for both functional and decorative parts.
Key Advantages:
Excellent machinability with minimal tool wear
Naturally corrosion-resistant
Smooth surface finish, easy to polish
Visually appealing golden color
Good electrical and thermal conductivity
Common Grades:
C360 (Free-Cutting Brass) – Exceptional machinability, ideal for high-volume parts
C260 (Cartridge Brass) – More formable, used for deep-drawn components
Applications:
Widely used in plumbing fittings, electrical connectors, decorative hardware, instrumentation, and precision parts.
Bronze is an alloy primarily composed of copper and tin, known for its excellent corrosion resistance and good machinability. It offers higher hardness than pure copper and is commonly used in CNC machining applications where wear resistance and strength are crucial.
Common Applications:
Bushings and bearings
Marine hardware
Decorative components
Material Highlights:
✔ Good machinability
✔ High wear resistance
✔ Excellent corrosion resistance
Plastics
Polycarbonate (PC)
Overview:
Polycarbonate (PC) is a tough, transparent engineering plastic known for its high impact resistance and excellent dimensional stability. It’s lightweight and offers good thermal resistance, making it a popular choice for CNC machining in industries like electronics, automotive, and consumer products.
Common Applications:
Protective covers and housings
Light diffusers and enclosures
Medical device components
Material Highlights:
✔ High impact resistance
✔ Good clarity and light transmission
✔ Stable under heat and stress
✔ Lightweight and easy to machine
PVC (Polyvinyl Chloride)
Overview:
PVC is a rigid, lightweight, and chemically resistant plastic often used in CNC machining for applications where durability and insulation are important. While it’s not as impact-resistant as PC, it offers excellent resistance to moisture, corrosion, and many chemicals, making it ideal for both industrial and electrical components.
Common Applications:
Electrical insulation parts
Fluid and chemical handling systems
Structural components for equipment
Material Highlights:
✔ High chemical and moisture resistance
✔ Electrically insulating
✔ Lightweight and easy to machine
✔ Cost-effective for general-purpose use
Typical Colors:
PVC is commonly available in white, light gray, dark gray, and black. Color may vary depending on the grade (e.g., industrial, electrical, or plumbing applications).
POM (Delrin / Acetal)
Overview:
POM, also known as Delrin or Acetal, is a high-strength engineering plastic known for its excellent dimensional stability, low friction, and wear resistance. It machines very well and is often used as a lightweight alternative to metal in precision components.
Common Applications:
Gears and bearings
Bushings and rollers
Precision mechanical parts
Automotive and industrial components
Material Highlights:
✔ High strength and rigidity
✔ Excellent wear and abrasion resistance
✔ Low friction surface
✔ Outstanding dimensional stability
✔ Moisture and chemical resistance
Typical Colors:
POM is typically available in white and black, with blue also used in food-grade or safety-related applications.
Nylon (Polyamide, PA)
Overview:
Nylon is a versatile engineering plastic known for its excellent wear resistance, toughness, and low friction. It performs well under mechanical stress and is commonly used in CNC machining for parts requiring strength, flexibility, and durability. Nylon is also lightweight and offers good chemical and abrasion resistance.
Common Applications:
Bushings and bearings
Gears and rollers
Structural mechanical parts
Automotive and industrial components
Material Highlights:
✔ High mechanical strength and toughness
✔ Low friction and excellent wear resistance
✔ Good fatigue and impact resistance
✔ Lightweight and chemical resistant
Typical Colors:
Nylon is typically available in white, black, and natural (off-white). Variants may also come in blue or green for industrial or food-grade uses.
HDPE (High-Density Polyethylene)
Overview:
HDPE is a tough, lightweight, and chemically resistant plastic widely used in CNC machining. It’s known for its excellent impact resistance, low moisture absorption, and durability. HDPE is also FDA-approved for certain food-grade applications, making it a common choice in food processing and fluid systems.
Common Applications:
Fluid and chemical tanks
Wear pads and liners
Cutting boards and food equipment
Industrial pipe fittings
Material Highlights:
✔ Excellent impact and abrasion resistance
✔ Lightweight and flexible
✔ Low moisture absorption
✔ Chemical and corrosion resistant
✔ FDA-compliant grades available
Typical Colors:
Commonly found in natural (milky white), black, blue (food-grade), and green (chemical tanks and industrial use).
ABS (Acrylonitrile Butadiene Styrene)
Overview:
ABS is a tough, impact-resistant engineering plastic widely used for CNC prototyping and light-duty functional parts. It offers good strength, machinability, and dimensional stability. ABS is also easy to paint, bond, or finish, making it a popular material for appearance models and enclosures.
Common Applications:
Prototypes and concept models
Enclosures and housings
Consumer product components
Light mechanical parts
Material Highlights:
✔ Good strength-to-weight ratio
✔ Excellent machinability
✔ Impact and chemical resistant
✔ Smooth surface finish, paintable
✔ Cost-effective for prototyping
Typical Colors:
Usually available in white, black, gray, or ivory. Custom colors are also possible for design prototypes.
CNC Machining Surface Finishes
Check our 15+ options of surface finishes for your CNC machining parts
As Machined surface
Sand Blasted Finish
Anodized Finish (Anodizing)
Powder Coating Finish
Liquid Painted Finish / Spray Coating
Plating
Tolerances for CNC Machining
Our CNC machines operate with precision tolerances that meet industry standards, ensuring that every part is consistently accurate and fits perfectly with other components.
| Description | |
|---|---|
| General Tolerances | ISO 2768-mK |
| Precision Tolerances | HFJ can manufacture and inspect parts with strict tolerances according to your drawing specifications, including tolerances tighter than +/- 0.001 inches. |
| Maximum Part Size-Milling | Up to 1500 × 800 × 800 mm (X × Y × Z) |
| Maximum Part Size-Turning | Disc-type parts: up to Ø400 × 300 mm or Ø500 × 100 mm | Shaft-type parts: up to Ø100 × 750 mm, or Ø300 × 500 mm |
| Minimum Part Size | CNC Milling: 3*3*3mm | CNC Turning: Ø1 × 10 mm for shaft |
- Quality Is Our 1st Priority
We run a scientific and strict quality control system from blank materials to final packing.
If any unqualified dimensions are inspected, machining will be stopped at once, then we check and fix the issue before moving on, all parts processed in this issued step will be 100% inspected, and defective parts will be scrapped if they are not reworkable.
Our Happy Clients!
Frequently Asked Questions
In order to quote for you earlier, please provide us the following information along with your inquiry.
1)-Drawings (in PDF/CAD/DWG/STEP/IGS/JPG format)
2)-Quantity
3)-Surface treatment
4)-Any other special requirements, such as particularly tight tolerances, customized packaging and labels, urgent lead time and so on.
Although straight comparisons are not easy, HFJ's quote will be usually 70-80% less for CNC machined parts when compared to vendors in North America as well as Europe. Of course, what we are saying is based on the same quality, not on cutting corners.
This cost superiority benefits from China's unique labor advantages and the convenience of various material resources mobilization as well as very developed logistics.
Compared to other Chinese suppliers, we choose not to compete just on price，but to provide top quality, efficient& pleasant communication and our special one-stop service.
Most of the time, we respond within 24 hours of receiving the RFQ. If the quote is likely to be delayed, we’ll inform you immediately.
Yes, We are committed to providing one-stop solutions.
Unlike traditional factories, we offer various kinds of machining, surface finish, and multi-parts assembling, the most prominent strengths are individual packages for e-commerce sales.
And HFJ has rich experience at combine shipping your multiple Chinese suppliers’ products with ours, you save plenty of time and shipping cost.
Of course, your small order is warmly welcomed. We hope our effort will help you grow your business.
Let’s look at small orders in a different light, it’s mutual support to both companies, too.
Yes, we did this.
Please first let us know the general information of your item, if workable, then send us your sample by air. After receiving it, we’ll make a further evaluation.
Certainly, just send it, we value your designs and would protect them carefully.
The sampling cost will be refunded after confirming of mass production, please contact us for more details.
All defective items should be confirmed by both of us based on the clients’ RMA checklist as well as photos first, after that, we’ll act in good faith to provide you with complete satisfaction.
E.g. we would re-make the items for free or refund the money as necessary.
Our continuing business relies on earning your confidence in our ability to meet and exceed any reasonable expectations.
Once the order is confirmed, our independent PMC department will organize suitable manufacturing schedules.
And our production team holds meeting every morning to review manufacturing progress as well as discuss problems encountered and look for solutions to ensure schedules are on track.
For your better understanding, we can update you on the manufacturing progress weekly by sending pictures or videos if required.
We provide a wide range of surface finish services to meet almost all kinds of feelings and looks on your parts.
1)-Anodizing,
2)-Powder Coating,
3)-Liquid Painting,
4)-Electrophoretic coating,
5)-Electroplating,
6)-QPQ finish (Quench-Polish-Quench),
7)-Laser engraving,
8)-Silk Screen Printing
There are mainly 4 steps.
1)-Incoming Materials Check
2)-In-Process Quality Check
3)-Semi finished products inspection prior to surface treatment
4)-Final Product Quality Check prior to packaging
Click Quality page to learn more details.
We file drawings and test reports well in case for future reference, if you find any doubts after receiving parts, please contact us at the very first time, we’ll provide you solutions within ASAP.
It depends on the complexity of designs, surface finish, packing methods and quantity.
If your project is very urgent, we can adjust our current production flexibly and prioritize your job accordingly.
Usually 2 to 4 weeks could be a reference to samll orders.
If have to say one, then the minimum tolerance is ± 0.00025 in. We don’t have a given set of tolerances that apply to all processes and materials. However the true case is that final tolerances will depend upon several factors, including but not limited to:
-Manufacturing process
-Materials
-Design features
-Surface finish
-Parts size
Anyway, we analyze case to case. We’ll evaluate your drawings and requirements, and point out any areas where we are unable to meet your desired tolerances. At this point, it would be very helpful if you could indicate which tolerances must be met and which can be changed slightly in order to reduce machining time and costs without affecting their functionality.
It would be easier to both us, if all manufacturing and technical specifications to be followed are clearly specified in the 2D drawings.
Firstly, we can sign mutual non-disclosure agreements and will certainly adhere to it.
Additionally, we have strict policies in our company that no photos of a customer products will be disclosed after signing NDA.
Lastly, we value our reputation, ever collaborated with thousands of unique designs over years and never ever allow any type of proprietary information to be disclosed to 3rd party.
Max milling size: 1500*800*800mm
Max turning size: φ500 * 100mm, φ300 * 500mm, φ10～40 * 300mm
Automatic CNC longitudinal lathe max size: ＜φ20 * 400mm.
We renew our equipments from time to time, pls contact us for most recent updates.
According to products’ shape and surface requirement, we provide various packing choices, Check Details.
Of course, customized packing methods are welcomed!
We can update you the manufacturing progress weekly by sending pictures or videos if required.
Yes, but usually only for shipments by sea and by air, not for shipments by Express.
There is no single answer to this question.
Import tariffs vary greatly from country to country and depend on the type of imported goods. The commodities of most countries in the world conform to the International Harmonized System (HS) codes, which classify almost all commercially traded goods.
If you are very concerned about this, please let us know the usage, name and HS code (if you know) of the parts, then we’ll pre-check import duty for you.
