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 with live tooling integrates turning and milling operations, enabling efficient machining of complex parts with both cylindrical and milled features.
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 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.
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.
05Assembly 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.
From aluminum and steel to brass and plastics, we’ve got a wide selection of CNC materials for your custom parts.
Metals
Aluminum
Stainless steel
Steel
Brass
Bronze
Aluminum
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
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
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
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
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)
PVC (Polyvinyl Chloride)
POM (Delrin / Acetal)
Nylon (Polyamide, PA)
HDPE
ABS
Polycarbonate (PC)
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)
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)
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)
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
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
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
A raw finish straight from the CNC process, showing fine tool paths and a matte metallic texture.
Sand Blasted Finish
A matte, non-reflective surface, ideal for removing sharp edges and achieving a uniform, satin texture, available in different grit sizes to achieve fine, medium, or coarse textures
Anodized Finish (Anodizing)
Anodizing enhances the surface of aluminum parts by electrochemically converting and slightly etching the surface offering corrosion resistance, improved wear. Matte or glossy with different colors available.
Powder Coating Finish
A finish created by electrostatically applying powder paint and curing it — ideal for both protection and aesthetics, with options from matte to glossy in a wide range of colors.
Liquid Painted Finish / Spray Coating
Created by spraying liquid paint onto the part and heat curing it — ideal for achieving vibrant colors, glossy or matte finishes, and detailed surface coverage.
Plating
Plating applies a thin metal layer — like nickel, chrome, or zinc — to enhance surface hardness, corrosion resistance, and give parts a clean, reflective appearance.
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
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.
You guys are so smart and professional.
Your efficient and straightforward communication in details of parts save me a lot of time. The assemblies work with our machines very well. Look forward to cooperating again in days to come. Thanks.
Previously, HFJ was supplying me along with 7 other Chinese factories. But after 2017, they are our preferred CNC machining supplier. We placed all our overseas orders to HFJ. They are really patient, attentive and reliable. I am relieved to process my parts here!
I want to express my sincere thanks to you and your team. You did a great job and the machined parts are perfect! Please express my thanks to your logistic team especially, they gather my 14 vendors' products for me and do the integrated optimization job, then combine shipping, which save me so much time and cost! I am lucky to have you be my products' collecting and distributing center from China to USA.
I have an assembled unit involes many processes, e.g. turning&milling parts, stamping cover, rubber washer, customized rivets etc. All these parts require dimensionally very good to highly fit each other. And the most difficult portion is that there is no drawings available! While with this ONLY one sample, HFJ help me disassemble all parts, measure cooresponding dimensions, customize stamping mould, and find proper rivets vendor.....I am placing a trial order for this now, they solve my headache once again as they did years ago for my fuel assembly. I am impressed with your supports, hardworking, efficient commumnication at your late night and weekend, I appreciate all those very much!
Hello, Thank you for checking in. Yes, these fuel caps are made exactly to our specifications and fit our fuel tank perfectly. We plan to make another order soon of 5000pcs. We'll make the handle change for easier grab at that time, will let you know soon when we have drawings updated.
I am very happy with your service again, everything came out great. Packaging was perfect! I want to thank you for paying attention to quality, and communicating with me about the QPQ finish. It’s rare that my feedback is only positive, but you’ve earned it!
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Frequently Asked Questions
Q1- What should I provide to get your quote?
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.
Q2- How does HFJ compare to various other suppliers in terms of price?
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.
Q3- How much time does a quotation take?
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.
Q4- Are you able to handle multiple-processes, like a full product combined with machining, surface finish and assembling then deliver to my 3PL wharehouse?
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.
Q5- Do you accept small quantity orders?
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.
Q6- Are you able to make a item according to my initial sample?
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.
Q7- Could you sign NDA if I need to keep my designs in confidence?
Certainly, just send it, we value your designs and would protect them carefully.
Q8- What’s your sample policy？
The sampling cost will be refunded after confirming of mass production, please contact us for more details.
Q9- What if I am not completely satisfied with the parts I receive?
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.
Q10- How do you ensure the lead time?
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.
Q11- What types of surface finish can you do?
We provide a wide range of surface finish services to meet almost all kinds of feelings and looks on your parts.
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.
Q13- How soon can you finish my parts?
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.
Q14- What tolerances can HFJ achieve? What are the minimum tolerances that can be machined to?
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.
Q15- How do HFJ keep my designs confidential?
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.
Q16- What largest dimensions do your machines handle?
Automatic CNC longitudinal lathe max size: ＜φ20 * 400mm.
We renew our equipments from time to time, pls contact us for most recent updates.
Q17- How do you pack? Can I customize my product packaging?
According to products’ shape and surface requirement, we provide various packing choices, Check Details.
Of course, customized packing methods are welcomed!
Q18- How do I know the progress of my order?
We can update you the manufacturing progress weekly by sending pictures or videos if required.
Q19- Does HFJ insure for shipments?
Yes, but usually only for shipments by sea and by air, not for shipments by Express.
Q20- How much import duty shall I pay for my goods?
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.
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We will contact you within 1 working day, please pay attention to the email with the suffix “@hfjmfg.com”.
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