Best CNC Machining Services in China

Get High-Quality CNC Machined Parts from a Reliable China Factory

China CNC Machining Services

Headquartered in China, Runsom has more than 20 years of custom CNC machining experience. We are able to offer custom CNC machining services from design, rapid prototyping, and complex parts geometry to low or large-volume production. We are always committed to producing high-quality machined parts in line with your budget and lead time demand.

There is no need to worry about the language exchange because our team and sales representatives all are experts in English. So they will keep in touch with you from quote to delivery for every detail of your order. Ready to outsource CNC machining services to China? Runsom is here to help and we always welcome the challenge! Get started with your China CNC machining journey.

Top CNC machining services we offer include: CNC milling, CNC turning, 5-axis CNC machining, micromachining, Swiss screw machining, and more.

Why Choose China for CNC Machining?

China has made dramatic achievements in the manufacturing sector with its strength in low cost and rapid lead time. Nowadays, there are increasing quantities of companies seeking to outsource their manufacturing needs, especially for the CNC machining services. In fact, cooperating with Chinese suppliers for CNC machining is a tendency for global product developers by virtue of their superior capabilities and efficiency that few other countries can match.

The CNC machining and rapid prototyping services supplied by Chinese factories can be commonly found around the world not just in the domestic markets. Moreover, an increase in CNC machining suppliers further helps to reduce costs. Choosing China CNC machining services to obtain better results is mostly attributed to these key factors:

  • Improved supply chain and logistic options;
  • No incurring high hardware costs, labor costs, and training costs;
  • Nearly no raw materials waste, lower price.
The Reason Why Choose China for CNC Machining

How to Get Custom CNC Machining Services With Runsom in China

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Our China CNC Machining Capablities

Runsom, a Chinese supplier, offers a wide range of custom micro CNC machining services, including 3, 4, and 5-axis CNC milling and turning, grinding, EDM, laser cutting, and others. Also, We can serve you custom CNC machining from design, rapid prototyping, and complex parts geometry to low or large volume production, and are always committed to producing high-quality machined parts in line with your budget and lead time demand. Check out our infinite machining capabilities in China.

CNC Machining Processes

CNC Milling Services at Runsom

CNC milling is to cut solid plastic and metal material into final precision parts using different axis milling processes. Milling can be also known as a perfect way of making tooling for die casting and injection molding. 

CNC Milling

CNC Turning Services at Runsom

CNC turning is a process of machining parts with cylindrical features from metal or plastic rod stock. This process allows to make any circular parts effectively such as shafts, worms, and spheres, and it can apply to the creation of parts with complex external and internal geometries and various threads.

CNC Turning

CNC Machining Materials & Finishes

Choosing the exact materials and surface finishes is a vital step in the manufacturing of your CNC machining projects. Headquartered in China, more than a CNC shop, we are also a reliable supplier who stocks all kinds of materials and offers various finishing options on your demand.


Aluminum Alloys

CNC Turning Services at Runsom

Aluminum 6061
Aluminum 5052
Aluminum 2024
Aluminum 6063
Aluminum 7050
Aluminum 7075
Aluminum MIC-6
Learn more about aluminum for CNC machining.

Copper Alloys

CNC machining in copper

Copper 101
Copper C110

Brass Alloys

CNC machining in brass

Copper 260
Copper 360
Learn more about brass for CNC machining.

Stainless Steel Alloys
  • Nitronic 60 (218 SS)
  • Stainless Steel 15-5
  • Stainless Steel 17-4
  • Stainless Steel 18-8
  • Stainless Steel 303
  • Stainless Steel 316/316L
  • Stainless Steel 416
  • Stainless Steel 410
  • Stainless Steel 420
  • Stainless Steel 440C

Learn more about stainless steel for CNC machining.

Steel Alloys

CNC machining in steel

Steel 1018
Steel 1215
Steel 4130
Steel 4140
Steel 4140PH
Steel 4340
Steel A36

Titanium Alloys

Titanium CNC Machined PartsTitanium (Grade 1)
Titanium (Grade 2)
Titanium (Grade 5)

Learn more about titanium for CNC machining.


Learn more about plastic for CNC machining.


As machined

As machined CNC Machined Parts

As machined: Without any surface treatment processing methods, the parts will leave visible tool marks and burrs, which can be completed quickly and cost-saving.

Bead Blasted

Bead Blasted CNC Machined Parts

Bead Blasted: A surface treatment process to obtain a certain degree of cleanliness and different roughness on the surface of the workpiece. The surface after sandblasting is dull and matt.


Anodized CNC Machined Parts

Anodizing: A process of forming a layer of oxide film on aluminum products, in order to overcome the defects of aluminum alloy surface hardness and wear resistance. Many colors(such as black, red, blue, etc.)are available. Divided into Type II (normal) and Type III (hard), Type III is usually thicker than Type II and more corrosion resistant.

Powder coating

Powder coating at RunsomPowder coating: The plastic powder is adsorbed to the surface of the workpiece by electrostatic spraying to form a powdery coating, and then the powder layer is cured by heating and baking to level it into a uniform film layer. It is usually used for appearance parts, and a variety of colors is available.

CNC Machining Tolerances

Our standard tolerance for metal is DIN-2768-1-f and plastic is DIN-2768-1-m in CNC machining. The tolerance is greatly influenced by the part’s geometry and material type. For the specific tolerance details of different parts, please contact us.

Linear dimension +/- 0.025 mm
+/- 0.001 inch
Hole diameters (not reamed) +/- 0.025 mm
+/- 0.001 inch
Shaft diameters +/- 0.025 mm
+/- 0.001 inch
Part size limit 950 * 550 * 480 mm
37.0 * 21.5 * 18.5 inch
CNC Machining Tolerances

CNC Machining Applications

Because CNC machining can achieve a high precision without changing the material structure with good manufacturing speed, it is becoming growing common as the range of machines, control systems, and tools for CNC machining continues to expand. Runsom is dedicated to providing precision machining services for various industries and our precision CNC crafted parts can be found in all areas of the industry, including:

Oil & Gas Industry Machining Services in California

Experts at Runsom master the comprehensive knowledge of CNC machining for the oil field and gas industry paired with the assurance of high precision offered by top-notch CNC machines.

Motorcycle Industry Machining Services in California

Runsom has rich experience in manufacturing parts for prototyping new accessories, parts, and components by working with OEM, aftermarket motorcycle, power sports, and automotive companies.

Tool & Die Industry Machining Services in California

Runsom may be your best choice whether you need precision lathe work or multi-axis CNC milling for high-quality tools and dies to accurately function in the machinery.

Electronic Enclosures Machining Services in California

Runsom is a reliable partner for your custom electronic enclosures with our precision CNC machining services for more than ten years. Work with us, you can receive parts with guaranteed quality in industry-leading lead time beyond your imagination.

Medical Industry Machining Services in California

The precision medical components fabricated by Runsom can be easily found in Trocar/Cannula Systems, CT and MRI Scanner Systems, Biopsy Cutters, Respiratory, Cardio Pulmonary and Cardiac Devices, and more.

Automotive Industry Machining Services in California

Our precision CNC automotive machining process enables us to deliver automotive parts with high quality and tight tolerance, no matter for both designing and producing vehicle prototypes or parts.

If you are looking for a rapid prototyping manufacturer or a CNC machine shop to fabricate small, medium volume, or mass production products, Runsom is an ideal choice. Our well-trained and experienced staff manufactures parts in line with drawings on modern CNC machines,  with the highest accuracy and processing quality in all sizes. In addition, we provide professional design considerations for your CNC machining projects.

Want to get the most professional and fastest service for your CNC project? Upload your CAD files now and obtain a quote!

Why Choose Runsom for CNC Machining Service China

Runsom's Experience of CNC Machining

You may rest assured that we have an experienced engineering team, advanced production, inspection equipment, and mature management systems.

15 Years of Experience

Runsom's Machining Capabilities
  • Global delivery as fast as 7 days
  • Machined prototypes in as fast as 1 day
  • 50+ metals and plastics, 10+ surfaces finishes
  • Tolerances down to +-0.005mm
  • ISO 9001: 2015 certified factory
  • 40+ CNC machines
  • 50000+ machined parts each month

Machining Capabilities

Quality Reliability Provided by Runsom
  • ISO 9001:2015
  • Advanced testing equipment
  • Material certification
  • First article & in-process inspections
  • Final inspection before shipment
  • Full dimensional report
  • Rework & refund policy

Quality Reliability

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CNC Machining FAQs

The main costs associated with CNC machining can be grouped into machining time, start-up costs, material costs, and feature costs. To reduce costs you need to understand the impact of these factors on cost.

  1. The best way to reduce machining time is to design features that can be machined quickly, for instance, choosing the correct radii for internal corners, reducing cavity depth, increasing wall thicknesses, limiting thread length, and designing holes with standard sizes.
  2. Material costs can be reduced by considering the size of the blank required, and the cost and machinability of the bulk material (softer alloys are faster to machine).
  3. Start-up costs can be reduced by reducing the number of part rotations or repositioning required to finish the part, for example, separating geometries into multiple parts that can be assembled later.
  4. Feature costs can be reduced by only using tolerances when strictly necessary, removing all text & lettering, and avoiding multiple surface finishes.

For more details, please check out our guide about minimizing the cost of CNC machined parts.

Our sound quality-control system makes sense that thousands of customers place their CNC machining orders in our company. The regular check and testing starts from incoming materials to shipment, ensuring each part is produced accurately for your specifications.

We possess a comprehensive, standardized inspection report with every order to ensure quality metrics are being met, and offer a first article inspection service on orders of 100+ units. We also have multiple certifications available on request, including but not limited to ISO9001, ISO13485, and AS9100.

Follow this page - Runsom Quality Control Standard to know more about our quality assurance measures.

Due to the spinning motion produced by the CNC milling machine's cutter, the surface finish of CNC machined parts will have visible tool marks. If you require a smooth, unblemished finish for your parts, we recommend choosing a secondary finish: grained finish (can only be applied to the outside of machined enclosures due to geometry) or powder coat.

To know more information about surface finishes for CNC machining, you can refer to this article.

CNC machining is widely used across a wide range of industries. It is common in aerospace, automotive, consumer electronics, robotics, agriculture, and other fields that frequently use metal parts. It is also widely used in medical devices, household goods, energy, oil and gas, and other consumer applications. It is one of the most common processing methods in the manufacturing field.

Runsom has offered ultra-precision CNC crafted components for global industries including oil and gas CNC machining, medical instruments CNC machining, optical CNC machining, tool and die parts CNC machining, motorcycle components CNC machining, electronic enclosures CNC machining, automotive parts CNC machining, etc.

Runsom was established by mechanical engineers and now we have a talented and powerful team. Until now, we've written a lot of content on CNC machining over the years. You can find a selection of resources below, or you can head to our knowledge hub and filter on CNC machining case studies, in-depth design guidelines, and explanations of different surface finishes.

We've also written a complete CNC machining design guide, which has been updated for 2020. Here you can learn about how many different kinds of mills and lathes work and how to select the best suitable materials for CNC machining, so you can easily figure out their benefits & limitations. You'll also learn the basic design rules for machining, the most common applications of each material, and surface finishes available for CNC machining, so you can make the right choice every time.

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