Online CNC Machining Services

Top Proto delivers CNC machining services for companies that need custom machined parts with tight tolerances, fast turnaround, and dependable quality. From prototype CNC machining to low-volume production, we manufacture precision metal and plastic components for engineering, industrial, and product development teams.

Get instant pricing, project lead times, and DFM feedback.

Accepted File Types: STEP, STP, SLDPRT, STL, DXF, X_T, X_B, IPT, CATPART, PRT, SAT, 3MF, JT

What is CNC Machining？

In simple terms, CNC machining is a manufacturing process which relies on preprogrammed computer software and machining tools to shape raw material in a certain way. Here at Top Proto, we employ best in class CNC systems to manufacture precise and intricate parts in a variety of metals, plastics, and composite materials. We also manufacture parts for high-end applications because we ensure the parts are built to high performance specs and quality.

Why Top Proto for CNC Machining Services?

Our network of over 10,000 suppliers allows us to provide small-batch machining or large-volume production at competitive pricing. With the CNC machining offer, rest assured, we will get the job done quickly and maintain the quality standard.

assures the quality of your machined parts with our ISO 9001:2015, ISO 13485, IATF 16949:2016, and AS9100D certified quality management system, ITAR registration, and options to add inspections, hardware traceability, material certifications, and CoCs. We accept technical drawings and have support teams to ensure you get quality CNC-machined parts on time.

CNC Milling

Multi-axis machining of complex parts with precision and speed. We utilize advanced technology to create components for demanding industrial uses.

See Detail CNC Milling

CNC Turning

High-accuracy machining of all-round and cylindrical parts with ease. Our turning services provide consistent quality and perfect dimensions for every component.

See Detail CNC Turning

5-Axis Machining Services

Delivering high-precision machining for complex geometries, reducing setup time, boosting accuracy, and ensuring flawless results for intricate parts.

See Detail 5-Axis Machining

Wire EDM

High-accuracy machining of thin profiles in delicate and hard materials. Our process ensures extreme precision for intricate parts with very tight tolerances.

See Detail Wire EDM

Our Services

Our CNC machining services cover precision milling, turning, drilling, and finishing for custom parts used in prototypes, bridge production, and repeat manufacturing programs. We support both simple and complex geometries across a wide range of materials

Made in China. Precision You Can Rely On.

Top Proto operates from Shenzhen, Guangdong, China — the global hub for precision manufacturing, advanced component supply chains, and technology production. Our facility houses over 300 CNC machining centers, injection molding presses, sheet metal fabrication lines, and 3D printing systems operating under a unified ISO 9001:2015, ISO 13485, IATF 16949:2016, and AS9100D certified quality management system. Skilled technicians and meticulous in-process inspection at every production stage ensure that custom metal and plastic parts are delivered to specification — with the dimensional inspection reports to prove it.

300+

Machines Running at Peak Efficiency

0.005mm

Ultra-Fine Tolerances Achievable

24 Hrs

Lead Times Starting From

50+

Engineering Materials Available

As Machined

Visible tool marks with standard 3.2μm Ra finish. Most economical option for functional parts

Bead Blasting

Creates a uniform matte or satin surface finish. Removes tool marks for a clean aesthetic.

Brushed Finish

Unidirectional grain produced by polishing with grit. Excellent for decorative panels and handles.

Anodized Blue

Type II anodizing providing corrosion resistance and vibrant, metallic blue aesthetic finish.

Black Oxide

Chemical conversion coating for steel and stainless steel. Adds mild corrosion resistance without dimensional change.

Gold Anodized

Provides a hard, wear-resistant layer with a premium golden aesthetic. Popular for aerospace components

Clear Anodized

Protective oxide layer that maintains the natural silver look of aluminum while improving durability.

Mirror Polish

Highest level of polishing to achieve a reflective, mirror-like surface. Ideal for optical and decorative applications.

CNC Machining Surface Finishes

Achieve the exact functional and aesthetic requirements for your machined components with our industry-leading finish gallery.

Materials for CNC Machining Services

Leading companies and engineers rely on Top Proto for rapid iterations and durable, high-quality parts. Whether it’s for prototyping or full-scale production, our wide range of materials ensures we meet the unique requirements of any CNC Machining Services project with precision and speed.

Metal Materials

View All

Plastic Materials

View All

Industry Expertise at Top Proto

Top Proto has direct production experience across nine industries, each with its own dimensional tolerance standards, material certification requirements, and quality documentation expectations. We do not apply a generic machining approach to every sector — our engineering team reviews your industry-specific requirements before production begins and applies the process controls, material sourcing, and inspection methods appropriate for your application.

Our CNC Machining Gallery Parts

Explore our portfolio of high-precision components, showcasing advanced technology and engineering excellence. From intricate milling to high-speed turning, each part reflects our commitment to ISO-certified quality and technical perfection.

Rapid Tooling

Focus on speed and agility for early-stage development and iterative design cycles.

Production Tooling

High-volume, durable solutions for long-term manufacturing and market-scale production.

How We Works – 3-Stages Workflow

We guarantee that CNC parts are delivered on time and that the process is completely transparent in the following 3 simple steps:

Upload Your Files

Instant prices with DFM feedback for many file types.

We Manufacture Your Parts

You can select from many materials and methods.

Tracking and Receiving Your Parts

View the QC documentation and inspection photographs.

Frequently asked questions

What is CNC Machining?

CNC machining is a manufacturing process in which computer-controlled cutting tools remove material from a solid workpiece to produce a finished component. The machine follows a precise programmed path derived from a CAD file, allowing consistent reproduction of complex geometries across multiple parts.

How does Top Proto help with prototyping?

Top Proto produces prototype parts from the same materials and processes used in production, so the parts you test reflect the actual performance of your final design. We review your CAD files for manufacturability before production begins and return dimensional inspection reports with every prototype order.

Which industries do you serve?

Top Proto machines parts for aerospace, automotive, medical devices, robotics, electronics, semiconductor, communication, new energy, and consumer product applications. Each industry has specific tolerance, certification, and documentation requirements that our team is familiar with.

What is your machining accuracy?

Our standard machining tolerance is +/-0.01mm, and we can achieve precision tolerances down to +/-0.005mm on features where the drawing requires it. Every part is measured against your specified tolerances during inspection before shipment.

Can you handle mass production?

Yes. Top Proto scales from single prototype parts to production runs exceeding 10,000 units. Our facilities in Shenzhen operate 300+ machines, and our production planning team manages capacity to maintain consistent lead times across high-volume orders.

CNC Manufacturing Resources

Technical guides and process comparisons from the Top Proto engineering team, covering material selection, process decision frameworks, and manufacturing design principles for engineers and product developers.