CNC Milling
From flat surfaces and deep pockets to complex contours, CNC milling handles a wide range of custom part geometries.
Explore ServicesCustom CNC Machining Services
Get high-quality custom CNC-machined prototypes and production parts with tight tolerances, fast turnaround, and over 15 years of manufacturing expertise.
Industries We Serve
From aerospace components to consumer products, our CNC machining capabilities span a wide range of industries and applications.
CNC Turning
Ideal for shafts, bushings, pins, and other cylindrical components that require precise diameters and consistent concentricity.
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CNC Routing
A cost-effective solution for machining large-format plastic, composite, and other non-metal parts at speed.
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5-Axis CNC Machining
Complex features can be reached from multiple angles in fewer setups, reducing repositioning and improving part accuracy.
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Precision Machining
When tight tolerances matter, precision machining delivers the dimensional control and repeatability critical components demand.
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Large Part CNC Machining
Built for components that exceed standard machining envelopes, with the capacity to handle large and complex geometries.
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Swiss CNC Machining
Swiss-type turning excels at producing small, slender, and intricate parts with exceptional precision and production efficiency.
Explore ServicesFrom Prototype to Mass Production
Bringing a new product to market? Our NPI (New Product Introduction) program helps you transition from prototype to mass production with confidence, speed, and quality.
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Step 01
Prototype
DFM Analysis
Step 02
Validation
Prototype Development
Step 03
Mass Production
Production Launch
Why Choose RapidDirect
Your Trusted Manufacturing Partner in China
With over 15 years of experience in precision CNC machining, we combine advanced technology, rigorous quality control, and dedicated customer service to deliver parts you can trust.
High Quality Parts
Our ISO-certified CNC machining produces precise, reliable parts with strict inspection for fit and performance.
Fast Lead Time
With local workshops and a network of CNC machine shops, we offer fast CNC machining capabilities and quick turnarounds, including lead time as fast as 1 day.
Engineering Support
Rely on our team for all your CNC machining needs. Our specialists provide support to maximize design efficiency and quality.
20,000+
Customers Worldwide Trust.
120+
Countries and Regions Served
700+
Machines Set Up
5000m²
Factory in Total
Manufacturing Footprint
Inside the Facilities Behind RapidDirect Production
Explore the facilities, equipment scale, and production capabilities that support RapidDirect projects from prototyping through production.
CNC Machining Shop
- Established
- 2017
- Number of Machines
- 400 machines
- Location
- Foshan
CNC Machining Materials
Choose from 30+ CNC machining materials to match your project’s functional and aesthetic requirements. From aluminum, steel, and brass to advanced plastics, we provide high-quality materials for your custom CNC parts.
Aluminium
Aluminum is lightweight, strong, and easy to machine, positioning it great for various applications like aerospace and automotive parts. Its corrosion resistance also adds to its appeal in outdoor projects and structural components.
Common Grades
Aluminum 6061
6061-T6
Aluminum 2024
Aluminum 5052
+ 6 grades
Popular Finishes
As machined
Anodizing
Powder coating
Electroplating
+ 3 finishes
Key Properties
Color: Silver
Price: $$
Lead Time: ABout 5 business days
Copper
Copper is highly conductive and malleable, making it a top choice for electrical wiring and plumbing. Its natural antibacterial properties also make it ideal for medical applications, while its aesthetic appeal suits decorative items and artwork.
Common Grades
Copper C101(T2)
Copper C103(T1)
Copper C103(TU2)
Copper C110(TU0)
+ 1 grade
Popular Finishes
As machined
Polishing
Sand blasting
Tumbling
+ 7 finishes
Key Properties
Color: Red-orange
Price: $$$
Lead Time: About 5 business days
Bronze
Bronze, an alloy of copper and tin, is known for its durability and resistance to corrosion. It’s widely used in marine applications, sculptures, and bearings, thanks to its strength and ability to withstand harsh environments.
Common Grades
Tin Bronze
Popular Finishes
As machined
Polishing
Sand blasting
Tumbling
+ 8 finishes
Key Properties
Color: Metallic brown
Price: $$$
Lead Time: About 5 business days
Steel
Steel is a strong and versatile material, widely used in construction and manufacturing. Its high tensile strength makes it suitable for structural components, while various Subtypes enhance its properties for specialized applications, like tools and machinery.
Common Grades
Steel 1018
1020
1025
1045
+ 14 grades
Popular Finishes
As machined
Electroplating
Passivation
Powder coating
Key Properties
Color: Silver Grey
Price: $$$
Lead Time: About 7 business days
Stainless Steel
Stainless steel is resistant to rust and staining, making it perfect for kitchen appliances and medical equipment. Its strength and aesthetic appeal also make it a popular choice for architectural designs and automotive parts.
Common Grades
Stainless Steel SUS201
SUS303
SUS 304
SUS316
+ 7 grades
Key Properties
Color: Silver Grey
Price: $$$
Lead Time: About 7 business days
Magnesium
Magnesium is lightweight yet strong, often used in aerospace and automotive applications where reducing weight is critical. Its machinability allows for complex shapes, and it's also utilized in various electronic devices for its excellent conductivity.
Common Grades
Magnesium Alloy AZ31B
AZ91D
Popular Finishes
As machined
Polishing
Sand Blasting
Tumbling
+ 8 finishes
Key Properties
Color: White-silver
Price: $$$$$
Lead Time: About 8 business days
Titanium
Titanium is incredibly strong and lightweight, making it ideal for aerospace and medical implants. Its resistance to corrosion and biocompatibility enhance its use in demanding environments, while its high strength-to-weight ratio suits various industrial applications.
Common Grades
Titanium Alloy TA1
Alloy TA2
Alloy TC4/Ti-6Al 4V
Popular Finishes
As machined
Polishing
Sand Blasting
Tumbling
+ 7 finishes
Key Properties
Color: Silver
Price: $$$$$
Lead Time: About 8 business days
ABS
ABS is tough, heat-resistant, and impact-resistant. Lightweight and easy to work with, this material suits car parts and consumer goods where durability matters but cost is also important.
Common Grades
ABS Beige(Natural)
ABS Blac
ABS Black Antistati
ABS Milky Whit
+ 2 grades
Popular Finishes
As machined
Sand blasting
Tumbling
Teflon coating
+ 3 finishes
Key Properties
Color: Lighe Beige Black
Price: $$
Lead Time: About 6 business days
PC
Polycarbonate is super durable and clear, with amazing impact resistance. Commonly found in bulletproof glass and safety gear, it can take a hit without cracking.
Common Grades
PC Black
PC Transparent
PC White
PC Yellowish White
+ 1 grade
Popular Finishes
As machined
Sand blasting
Tumbling
Painting
+ 1 finish
Key Properties
Color: Black White
Price: $$
Lead Time: About 6 business days
PMMA (Acrylic)
PMMA (acrylic) is clear, weather-resistant, and won't fade. Ideal for outdoor displays, signage, and lighting, it holds up well in the elements.
Common Grades
PMMA Black
PMMA Transparent
PMMA White
Popular Finishes
As machined
Sand blasting
Tumbling
Painting
Key Properties
Color: Black White
Price: $
Lead Time: About 6 business days
POM
POM is strong and has a low-friction surface, making it perfect for precision parts like gears and bearings where things need to fit just right and work smoothly.
Common Grades
Dark brown (coffee) POM 100AF
POM Black
POM Blue
POM White
Popular Finishes
As machined
Sand blasting
Tumbling
Painting
Key Properties
Color: Black White Blue
Price: $$
Lead Time: About 6 business days
PA (Nylon)
Nylon is versatile, tough, and resists wear. Often chosen for gears, bearings, and other parts that handle constant friction and heat without breaking down.
Common Grades
PA(Nylon) Blue
PA6 (Nylon)+GF15 Black
PA6 (Nylon)+GF30 Black
PA66 (Nylon) Beige(Natural)
+ 1 grade
Popular Finishes
As machined
Sand blasting
Tumbling
Teflon coating
+ 2 finishes
Key Properties
Color: Black Blue
Price: $$
Lead Time: About 6 business days
PE
Polyethylene is lightweight and tough, with great impact resistance. It's a go-to material for packaging, containers, and anything that needs to resist cracking under pressure.
Common Grades
HDPE
UHMW-PE
LDPE
Popular Finishes
As machined
Sand blasting
Tumbling
Painting
+ 1 finish
Key Properties
Color: Black White
Price: $$
Lead Time: About 6 business days
PEEK
PEEK is strong and can handle high temperatures without losing its strength. Found in high-performance industries like aerospace and medical implants, it's built for extreme conditions.
Common Grades
PEEK Beige(Natural)
PEEK Black
Popular Finishes
As machined
Sand blasting
Tumbling
Painting
+ 1 finish
Key Properties
Color: Beige Black
Price: $$$$$
Lead Time: About 8 business days
PP
Polypropylene is tough, chemical-resistant, and handles higher temps. It's commonly found in car parts, containers, and packaging, especially where exposure to heat or chemicals is common.
Common Grades
PP Black
PP White
PP+GF30 Black
Popular Finishes
As machined
Sand blasting
Tumbling
Painting
+ 1 finish
Key Properties
Color: Black White
Price: $
Lead Time: About 6 business days
HDPE
HDPE is super strong and impact-resistant, with a high strength-to-density ratio. Ideal for bottles, containers, and pipes that need to withstand outdoor wear and tear.
Common Grades
HDPE Black
HDPE White
Popular Finishes
As machined
Sand blasting
Tumbling
Painting
+ 2 finishes
Key Properties
Color: Black White
Price: $$
Lead Time: About 6 business days
HIPS
HIPS is easy to machine and holds up well to impact. This makes it an excellent choice for prototypes, models, and temporary displays where you need something light but sturdy.
Common Grades
HIPS Board White
Popular Finishes
As machined
Sand blasting
Tumbling
Painting
+ 2 finishes
Key Properties
Color: White
Price: $$
Lead Time: About 6 business days
LDPE
LDPE is soft, flexible, and resistant to cracking. Perfect for plastic bags, tubing, and shrink wrap where heat sealing is essential.
Common Grades
LDPE White
Popular Finishes
As machined
Painting
Powder coating
Teflon coating
Key Properties
Color: White
Price: $$
Lead Time: About 6 business days
PBT
PBT is rigid, heat-resistant, and resists moisture. This material is often found in electrical parts, automotive components, and industrial connectors where high heat or wet conditions are a concern.
Common Grades
+ 1 grade
Popular Finishes
As machined
Sand blasting
Tumbling
Painting
+ 1 finish
Key Properties
Color: Black Milkey White
Price: $$
Lead Time: About 6 business days
Surface Finishes
We offer 10+ surface finish options for your CNC prototypes and full-production parts. Explore our most popular finishes below, or view our full finish library for additional options and technical specifications.
As Machined
As machined finish leaves the surface straight from the CNC machine, providing a cost-effective option with tool marks.
Feature:
Metals & Plastics
Anodizing
Anodizing increases corrosion resistance and wear properties, while allowing for color dyeing, ideal for aluminum parts.
Feature:
Aluminium
Polishing
Polishing achieves a high gloss finish, reducing surface roughness and enhancing the aesthetic appeal of metals.
Feature:
Stainless Steel, Brass
Sand Blasting
Sand blasting uses pressurized sand or other media to clean and texture the surface, creating a uniform, matte finish.
Feature:
Metals & Plastics
Brushed Finish
A brushed finish creates a unidirectional satin texture, reducing the visibility of marks and scratches on the surface.
Feature:
Aluminium, Stainless Steel
Powder Coating
Powder coating applies a thick, wear-resistant layer with excellent color and texture options, suitable for a variety of surfaces.
Feature:
Steel, Aluminium
Electroplating
Electroplating bonds a thin metal layer onto parts, improving wear resistance, corrosion resistance, and surface conductivity.
Feature:
Steel, Brass, Copper
Black Oxidize
Black oxidize is a conversion coating for ferrous metals that improves corrosion resistance and minimizes light reflection.
Feature:
Steel, Stainless Steel
Electropolish
Electropolish is a chemical process that smooths and brightens surfaces while improving corrosion resistance.
Feature:
Stainless Steel
Alodine
Alodine coating provides corrosion protection and improves paint adhesion, mainly used on aluminum surfaces.
Feature:
Aluminium
Heat Treatment
Heat treatment alters the mechanical properties of metal to increase its hardness, strength, or ductility.
Feature:
Steel, Aluminium
Customer Success Stories
Real-world CNC machining project cases across aerospace, automotive, medical and more. Browse selected project previews below — click to view full case study details.
Consumer Goods
Neck Massager Project: From Concept to Mass Production
Challenges
Balance ergonomics, appearance, cost, quality, and mass-production readiness.
Our Solution
Optimized the design, materials, internal structure, prototypes, and quality-control process.
Key Outcomes
- 50% faster product validation
- Lower redesign risk
- Consistent product quality
Industries
Industries We Serve
CNC machining solutions tailored to industry-specific requirements. We deliver custom manufacturing for aerospace, automotive, medical and more. Below are our key target industries — explore our full industry hub for deeper capability details.
View All IndustriesAerospace
High-strength lightweight structural and engine-grade CNC machined parts.
Automotive
Performance prototype and production components for EV & racing vehicles.
Automation
Custom mechanical parts for automated equipment and production lines.
Medical Devices
Precision biocompatible hardware for medical instruments and surgical parts.
Robotics
Lightweight, tight-tolerance robot structural components and joints.
Consumer Products
High-quality custom parts for consumer hardware and premium devices.
Technical & Design Guidelines for CNC Machining
Review CNC tolerances, dimensional limits and DFM design recommendations to optimize your parts for manufacturability. Download the spec sheet for full reference.
Core Technical Specs
Tolerance Standard
ISO 2768-m / 2768-c
Metals / plastics
Min Wall Thickness
0.5 mm
Geometry dependent
Max Part Size
4000 × 1500 × 600 mm
CNC milling
Lead Time
1–5 business days
Simple parts in 1 day
| General Tolerances | Metals: ISO 2768-m; Plastics: ISO 2768-c |
|---|---|
| Precision Tolerances | Tighter than ±0.001 in |
| Minimum Tool Size | End mill: 0.5 mm; Drill: 1 mm |
| Part Size Range | Milling: 5 × 5 × 5 to 4000 × 1500 × 600 mm |
| CNC Turning Size | Min. Ø2 × 2 mm; Max. Ø200 × 500 mm |
| Production Volume | Prototype to 10,000+ parts |
DFM Design Recommendations
Internal Radii
Drill depth ≤ 12× diameter
Avoid sharp internal corners.
Threads
Ø1.5–5 mm: 3×D; Ø≥5 mm: 4–6×D
Match thread depth to diameter.
Undercuts
Square; Full radius; Dovetail
Custom profiles available.
Text & Engraving
Min. width: 0.5 mm
CNC or laser engraving available.
Precision CNC Machining with Guaranteed Quality
Your success depends on reliable parts. Our CNC machining services provide precision machining with a 90% first-pass yield. You can get quality CNC machined parts for both prototypes and production runs.
Cerfications
Our ISO 9001 certified CNC machining facilities, together with ISO 13485, ISO 14001, and IATF 16949, meet the highest international standards for quality and compliance.
Expertise
We have more than 30 quality engineers and over 20 advanced inspection tools such as CMMs, 2D measuring systems, and XRF analyzers. This ensures accurate dimensions and consistent performance in every project.
Transparent Process
Each stage, from raw material to final inspection, follows strict quality control procedures. Full traceability and documented checks give customers worldwide confidence in every delivery.
RapidDirect FAQs
Find quick answers about manufacturability, lead times, materials, finishes, quality documentation, and compliance. Need more support? Start a quote or explore our Help Center.