Online CNC Machining Services

Custom CNC machining parts machining services for rapid prototyping, new product introduction and low-volume production.

  • Online instant quoting
  • Lead time as fast as 1 day
  • Tolerance as tight as ±0.02 mm

Save 30% on average!

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CNC milling Services Rapid Direct

Innovative technologies that upgrade custom CNC parts machining experience

Instant quote

No more waiting for email replies, get instant quotations in a minute by simply uploading your design files. Our big data quoting engine calculates online CNC quotations at competitive price.

DfM feedback

Check automatic manufacturability analysis of your parts online for FREE. Save the time checking with a technician on your designs before production.

All-in-one order management

Check and manage all your quotations and orders status at ease. Get notifications at every production updates, never worry about the machining progress again.

Our online CNC machining services

With over 200 sets of 3, 4, and 5-axis CNC machines in China, RapidDirect is your ideal choice for outsourcing custom and precision CNC machining services. We provide more than 100 different types of materials and surface finishes with experience in a seamless transtion from prototype through production. Lead time as short as days.

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cnc milling

CNC Milling Service

3-axis CNC milling price rate from $10 per hour, 5-axis CNC milling center highest tolerance up to ±0.0008″ (0.02 mm) Cost-effective CNC milling parts manufacturer for prototype machining and production parts.

CNC Turning Service

Self-owned workshop with 50+ CNC Lathes and CNC turning centers, providing cost-effective prototype and production machining services with fast lead times. Live tooling available for complex projects.

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cnc turning

Our experience in numbers

companies served

3000+

Companies served

parts produced

200,000+

Parts produced

countries shipped

50+

Countries shipped

years in business

10+

Years in business

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Materials for CNC Machining Parts

CNC machining have a long list of available materials for CNC prototypes and manufacturing parts, from hard metals like stainless steel and titanium, to soft metals such as aluminum, copper, brass, all the way to plastics including ABS, PC, PA, etc.

Aluminum

Aluminum is a highly ductile metal, making it easy to machine. The material has a good strength-to-weight ratio and is available in many types for a range of applications.


Price:
$$
Lead Time:
< 10 days
Wall Thickness:
0.75 mm
Tolerances:
±0.125mm (±0.005″)
Max part size:
200 x 80 x 100 cm
aluminum page banner

Copper

Copper displays excellent thermal conductivity, electrical conductivity and plasticity. It is also highly ductile, corrosion resistant and can be easily welded.


Price:
$$$
Lead Time:
< 10 days
Wall Thickness:
0.75 mm
Tolerances:
±0.125mm (±0.005″)
Max part size:
200 x 80 x 100 cm
cnc machining copper material

Brass

Brass has desirable properties for a number of applications. It is low friction, has excellent electrical conductivity and has a golden (brass) appearance.


Price:
$$$
Lead Time:
< 10 days
Wall Thickness:
0.75 mm
Tolerances:
±0.125mm (±0.005″)
Max part size:
200 x 80 x 100 cm
cnc machining brass material

Stainless Steel

Stainless steel is the low carbon steel that offers many properties that are sought after for industrial applications. Stainless steel typically contains a minimum of 10% chromium by weight.


Price:
$$
Lead Time:
< 10 days
Wall Thickness:
0.75 mm
Tolerances:
±0.125mm (±0.005″)
Max part size:
200 x 80 x 100 cm
cnc machining stainless steel material

Titanium

Titanium has a number of material properties that make it the ideal metal for demanding applications. These properties include excellent resistance to corrosion, chemicals and extreme temperatures. The metal also has an excellent strength-to-weight ratio.


Price:
$$$$$
Lead Time:
< 10 days
Wall Thickness:
0.75 mm
Tolerances:
±0.125mm (±0.005″)
Max part size:
200 x 80 x 100 cm
cnc machining titanium material

Plastics

Plastics are also very popular option for CNC machining because of its wide choices, relatively lower price, and significantly faster machining time needed. We provide all common plastics for CNC machining services.

  • POM
  • Nylon
  • ABS
  • PEEK
  • PTFE
  • PC
  • HDPE
  • PVC
  • PMMA
  • PET
  • PP
cnc machining plastics material

CNC Machining Surface Finishes

Apart from custom CNC milling and turning services, we also provide complete surface finishing options for precision machined parts.

Anodizing

Anodizing improves corrosion resistance, enhancing wear resistance and hardness, and protecting the metal surface. Widely used in mechanical parts, aircraft, and automobile parts, precision instruments, etc.

Materials:
Aluminum
Color:
Clear, black, grey, red, blue, gold.
Texture:
Smooth, matte finish.
Thickness:
1.8 μm to 25 μm (0.00007")
cnc machining anodizing surface finish

Bead Blasting

Bead blasting results in parts with a smooth surface with a matte texture. Used mainly for visual applications and can be followed by other surface treatments.

Materials:
ABS, Aluminum, Brass, Stainless Steel, Steel
Colors:
n/a
Texture:
Matte
Standards:
Sa1, Sa2, Sa2.5, Sa3
Applications:
Cosmetic parts
cnc machining bead blasting surface finish

Powder Coating

Powder coating forms a durable, wear resistant and corrosion resistant layer on the surface of parts. Powder coating can be used to apply colors to parts and is compatible with any metal.

Materials:
Aluminum, Stainless Steel, Steel
Colors:
Black, any RAL code or Pantone number.
Texture:
Gloss or semi-gloss
Applications:
Vehicle parts, household appliances, aluminum extrusions
powder coating cnc parts

Electroplating

Electroplating can be functional, decorative or corrosion-related. Many industries use the process, including the automotive sector, in which chrome-plating of steel automobile parts is common.

Materials:
Aluminum, Steel, Stainless Steel
Plate type:
Tin, Nickel, Electroless Nickel
Texture:
Smooth, glossy finish
Applications:
Electrical connections, jewelry, radiation shields
Subtypes:
Galvanizing, nickel plating, tin plating, passivation
cnc machining electroplating surface finsih

Polishing

Polishing is the process of creating a smooth and shiny surface, either through physical rubbing of the part or by chemical interference. The process produces a surface with significant specular reflection, but in some materials is able to reduce diffuse reflection.

Materials :
Aluminum, Brass, Stainless Steel, Steel
Colors:
n/a
Texture:
Glossy
Types:
Mechanical polishing, chemical polishing
Applications :
Lenses, jewelry, sealing parts
cnc machining polishing surface finsih

Brushing

Brushing is a surface treatment process in which abrasive belts are used to draw traces on the surface of a material, usually for aesthetic purposes.

Materials:
ABS, Aluminum, Brass, Stainless Steel, Steel
Colors:
n/a
Texture:
satin
Standards:
Sa1, Sa2, Sa2.5, Sa3
Applications:
Cosmetic parts
cnc machining brushing surface finsih
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CNC Machining Tolerance

Our standard tolerances for CNC machining of metals is DIN-2768-1-fine and for plastics is DIN-2768-1-medium. Tolerances are greatly affected by part geometry and type of material. For case-by-case studies, please contact us with email for details.

TypeTolerance
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

Our Quality Promise

  • ISO 9001:2015
  • Full dimensional report
  • Material certification
  • First article inspection
  • Rework & refund policy
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What is CNC Machining

About the CNC Process

CNC, or computer numerical control machining, is a subtractive manufacturing method that leverages a combination of computerized controls and machine tools to remove layers from a solid block of material. The desired cuts in the metal are programmed according to corresponding tools and machinery, which perform the machining task in an automated fashion.

CNC FAQs

How large of a part or panel can be CNC machined?

The maximum size sheet metal parts we are able to mill in a single setup is 4' x 8'. The maximum size bar stock that we are able to mill in a single setup is 26" x 16" x 12".

What is the smallest part or panel that can be CNC machined?

The minimum sheet metal part that can be vacuum-chucked without clamps is 5" x 5". Vices can be used for smaller parts. Please email info@rapiddirect.com for more details.

What kind of a finish does CNC machining leave?

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

Why was my CNC order quoted thicker than I intended?

The material used to CNC machine your design will always have a standard thickness tolerance, so it is part of our standard procedure to quote your design with some extra thickness.

Try RapidDirect now,
for free

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