Custom Online CNC Milling Services
On-demand CNC milling services for rapid prototypes and production parts. Get custom milled parts from various high-quality metals and plastics. Tight tolerance of 0.01 mm. Milled parts as fast as 3 day. ISO 9001:2015, IATF 16949:2016 certified.
How CNC Milling Works?

CNC milling is a precise manufacturing process that involves removing material from a workpiece using rotating cutting tools. The process begins with a digital design, typically created in CAD software. This design is then converted into a CNC program, which dictates the movements of the milling machine.
The workpiece is securely fastened to the machine’s table, and the cutting tool, mounted on a spindle, rotates at high speeds. The machine follows the programmed path, making precise cuts to shape the material into the desired form. CNC milling can create complex shapes and features, such as slots, holes, and contours, with high accuracy.
Three-axis milling moves the tool along the X, Y, and Z axes. Four-axis milling adds rotation around one axis, while five-axis milling allows rotation around two axes, enabling more intricate designs. This versatility makes CNC milling essential in various industries, from aerospace to medical devices.
Advantages of CNC Milling- CNC milling offers numerous advantages for manufacturing: | Applications of CNC Milling- CNC milling is widely used to produce a variety of precision parts and components: |
High Precision: CNC milling machines can produce parts with very tight tolerances, ensuring high accuracy and consistency in every piece. | Engine Components: Used in the manufacturing of engine blocks, cylinder heads, and pistons, ensuring high performance and durability in automotive and aerospace industries. |
Complex Geometries: With the ability to move in multiple axes, CNC milling can create intricate and complex shapes that are difficult or impossible to achieve with manual machining. | Gear Components: Essential for producing gears, splines, and shafts with tight tolerances, used in machinery and automotive applications. |
Efficiency: Automated operation allows for continuous production, reducing lead times and increasing productivity. Multiple parts can be produced with minimal downtime. | Medical Implants: Creates precise and high-quality implants such as hip joints, dental implants, and surgical screws for the medical field. |
Flexibility: CNC milling can work with a wide range of materials, including metals, plastics, and composites. This versatility makes it suitable for various applications. | Electronic Housings: Produces enclosures for electronic devices, ensuring proper fit and protection for circuit boards and components. |
Repeatability: Once a design is programmed, the machine can reproduce identical parts over and over, ensuring uniformity and reducing the risk of human error. | Custom Prototypes: Allows for the rapid development and testing of prototypes, helping designers refine their products before mass production. |
Cost-Effective: While the initial setup can be expensive, the efficiency and precision of CNC milling reduce overall production costs, especially for large quantities. | Tooling and Dies: Essential for creating molds, dies, and cutting tools used in various manufacturing processes. |
Safety: CNC machines operate with minimal human intervention, reducing the risk of accidents and enhancing workplace safety. | Complex Aerospace Parts: Used for producing turbine blades, brackets, and other intricate parts that require high precision and strength. |
CNC Milling Materials
At Zhonghui, our CNC milling service offers a diverse range of materials, ensuring precision and durability. This vast selection empowers our clients with optimal choices for their unique projects, boosting their product’s quality and performance.
Metals |
Characteristics |
Model |
Aluminum | lightweight yet strong, with excellent machinability and corrosion resistance. Ideal for aerospace and automotive parts. | 6061,6061-T6,2024,5052,5083, 6063,6082,7075,7075-T6,ADC12 (A380),A356 |
Copper | superior electrical conductivity and thermal properties, making it perfect for electrical components and heat exchangers. | Copper C101(T2), C103(T1), C103(TU2), C110(TU0), Beryllium Copper. |
Brass | Brass is durable and has a low friction coefficient, which makes it suitable for fittings, tools, and musical instruments that require precision. | Brass C27400, Brass C28000, Brass C36000 |
Bronze | Bronze is highly resistant to corrosion and metal fatigue, favored for bearings, bushings, and marine hardware. | Tin Bronze |
Steel | Steel is an alloy with high tensile strength and durability, commonly used in construction and automotive industries for its robustness. | Steel 1018, 1020, 1025, 1045, 1215, 4130, 4140, 4340, 5140, A36,Die steel, Alloy steel, Chisel tool steel, Spring steel, High speed steel, Cold rolled steel, Bearing steel, SPCC. |
Stainless steel | Stainless steel is renowned for its corrosion resistance, making it a prime choice for medical devices and food processing equipment. | Stainless Steel SUS201, SUS303, SUS 304, SUS316, SUS316L, SUS420, SUS430, SUS431, SUS440C, SUS630/17-4PH, AISI 304 |
Magnesium | Magnesium is the lightest structural metal, offering high strength-to-weight ratios, perfect for automotive and aerospace applications where weight is critical. | Magnesium Alloy AZ31B, Magnesium Alloy AZ91D |
Titanium | Titanium boasts the highest strength-to-density ratio among metals, highly resistant to corrosion and fatigue, ideal for aerospace, medical, and marine applications. | Titanium Alloy TA1, TA2, TC4/Ti-6Al 4V |
ABS | ABS is strong, durable, and offers good resistance to heat and impact. It’s preferred for automotive components and consumer goods. | ABS Beige(Natural), ABS Black, ABS Black Antistatic, ABS Milky White, ABS+PC Black, ABS+PC White |
Polycarbonate | Polycarbonate is extremely durable and has high impact resistance, along with excellent clarity, used for bullet-proof glass and protective gear. | PC Black, PC Transparent, PC White, PC Yellowish White, PC+GF30 Black |
PMMA | PMMA, or acrylic, is known for its crystal clarity and weather resistance, making it ideal for outdoor fixtures and display cases. | PMMA Black, PMMA Transparent, PMMA White |
POM | POM is strong, with a low friction surface and good dimensional stability, perfect for precision parts in mechanical applications. | Dark brown (coffee) POM 100AF, POM Black, POM Blue, POM White |
Nylon | Nylon is versatile, strong, and wears well against friction, commonly used for gears, bearings, and other wear-resistant surfaces. | PA(Nylon) Blue, PA6 (Nylon)+GF15 Black, PA6 (Nylon)+GF30 Black, PA66 (Nylon) Beige(Natural), PA66 (Nylon) Black |
Polyethylene | Polyethylene is lightweight and has high resistance to impact, widely used in packaging and containers. | PE Black, PE White |
PEEK | PEEK is renowned for its high temperature resistance and strength, often used in aerospace and medical implant manufacturing. | PEEK Beige(Natural),PEEK Black |
Polypropylene | Polypropylene is tough, has excellent chemical resistance, and is used for automotive parts, containers, and in packaging. | PP Black, PP White, PP+GF30 Black |
HDPE | HDPE is known for its high strength-to-density ratio, resistance to impacts, and is used in making bottles and corrosion-resistant piping. | HDPE Black, HDPE White |
HIPS | HIPS is easy to machine and offers good dimensional stability and impact resistance, suitable for prototyping and modeling. | HIPS Board White |
LDPE | LDPE is soft, flexible, and used in applications where heat sealing is required, such as in tubing and plastic bags. | LDPE White |
PBT | PBT is a strong, rigid plastic that is heat resistant and commonly used in electrical components and casings. | PBT Black, PBT Milky White(Natural) |
PVC | PVC is robust, cheap, and has good chemical resistance, used in plumbing, medical devices, and cables. | PVC Grey |
PET | PET is strong, resistant to moisture and chemicals, and widely used in food containers and textile fibers. | PET Black, White, PET+GF30 Black, PET+GF30 White |
CNC Milling Surface Finishes
Gain access to quality surface finishing for custom CNC milled parts to remove aesthetic flaws and improve the appearance of your products. We also provide rigid protection and additional resistance and strength to your parts through superior surface finishes.

As machined finish leaves the surface straight from the CNC machine, providing a cost-effective option with tool marks.


Polishing achieves a high gloss finish, reducing surface roughness and enhancing the aesthetic appeal of metals.

Sand blasting uses pressurized sand or other media to clean and texture the surface, creating a uniform, matte finish.

Tumbling smooths and polishes small parts by friction and abrasion in a barrel, offering a consistent but slightly textured finish.

Electropolish is a chemical process that smooths and brightens surfaces while improving corrosion resistance.


Alodine coating provides corrosion protection and improves paint adhesion, mainly used on aluminum surfaces.

A brushed finish creates a unidirectional satin texture, reducing the visibility of marks and scratches on the surface.

Powder coating applies a thick, wear-resistant layer with excellent color and texture options, suitable for a variety of surfaces.


Black oxidize is a conversion coating for ferrous metals that improves corrosion resistance and minimizes light reflection.
Tolerances for CNC Milling
Zhonghui ensures precision with our CNC Milling Tolerance standards. We commit to exact measurements, benefiting clients with consistent, high-quality results, optimized for search visibility. Our standard tolerances for CNC milled metals are ISO 2768-m and ISO 2768-c for plastics.
3-Axis | 4-Axis | 5-Axis | |
Maximum Part Size | 1000 x500 x500 mm | 1000 x500 x500 mm | 4000 x1500 x600 mm |
Minimum Part Size | 5 x 5 x 5 mm | 5 x 5 x 5 mm | 5 x 5 x 5 mm |
General Tolerances | ±0.1 mm | ±0.05 mm | ±0.1 mm |
Lead Time | Delivery of simple parts can be as fast as 3 day. | 7 bussiness days for most projects. | 7 bussiness days for most projects. |
CNC machining solutions
Accelerate product development with our rapid machining services. We offer fast turnaround times and specialize in quick production of high-quality prototypes and mold tooling, aiding your design verification process.
Low and High-Volume Production
Whether you need small batches or large-scale production, we can offer you both. With stringent tolerance controls and comprehensive capabilities, we adapt to your volume requirements without compromising on quality.