On-demand CNC Machining Services from China
Deliver your CNC Machining parts as design specifications, on time, and at a cost-effective factory price.
- Over 40 Certified Materials
- Custom Finishes
- No Minimum Order
- Fast Turnaround
Save 30% on average!
10+Years
Manufacturing experience
420+Customers
Over the world
2M+Parts
Custom Machined
99.9%
Satisfaction
Precision CNC Machining Services Supplier in China
Are you looking for a reliable partner to provide CNC machining services?
Plus Minus Three Industrial Co., Ltd is a leading CNC machining services supplier in China.
Our 3-axis, 4-axis, and 5-axis CNC milling, turning centers and CNC Lathe machine enable to make precise, high-quality CNC parts that fulfill your custom specifications.
With over 50 sets of CNC machines in China, ±3 can be your ideal choice for outsourcing custom and precision CNC machining services. no matter your industry. Get your quote today.
CNC Milling
3 Axis, 4 Axis and 5 Axis CNC Machining Service for simple and complex geometries parts.
CNC Turning
CNC turning with live tools combines lathe and milling capabilities to machine parts with cylindrical features.
Finishes Services
Add multiple finishes to your parts, such as Anodizing, Sand Blast, Powder Coat, Plating, etc.
Materials for CNC Machining Parts
±3 offers a wide variety of materials for custom CNC machining, plastic, and metal, including but not limited to:
| Aluminum | Stainless Steel | Mild, Alloy & Tool Steel | Other Metal |
|---|---|---|---|
| 6061-T6 | 303 | Mild steel 1018 | Brass C360 |
| 7075-T6 | 304 | Mild steel 1045 | Brass C260 |
| 6060 | 316 | Alloy steel 1215 | Copper C110 |
| 6082 | Alloy steel 4130 | Copper C101 | |
| 5052 | 17-4 | Alloy steel 4140 | Titanium Grade 2 |
| 5083 | 15-5 | Alloy steel 4340 | Titanium Grade 1 |
| 2014 | 416 | M2 HSS | |
| 2017 | 420 | Tool Steel A2 | |
| 2024 | 430 | Tool Steel A3 | |
| 440C |
CNC Plastics
| POM (Delrin/Acetal) | PET | Polycarbonate (PC) |
| ABS | PVC | Polyethylene (PE) |
| Acrylic( PMMA) | CPVC | UHMWPE |
| PEEK | PTFE (Teflon) | PEI (Ultem) |
| HDPE | Nylon |
Gallery of Our CNC machining parts
We machine rapid prototypes and low & large volume production orders for customers in multiple industries: medical devices, aerospace, automotive, defense, electronics, hardware startups, industrial automation, machinery, marine and robotics, and many more.
Surface Finishes for CNC Machined Parts
Apart from custom CNC machining services, we also provide complete surface finishing options for precision machined parts. If you require custom finish not on this list, please do get in touch as it is likely we can source it for you.
As machined (Ra 3.2μm / Ra 126μin)
This finishing option with the shortest turnaround time. Parts have visible tool marks and potentially sharp edges and burrs, which can be removed upon request.
Smooth machining (Ra 1.6μm / Ra 63μin)
Smooth machining is similar to a ‘As machined’ finish, but with less visible machine marks. Parts are machined at a lower feed rate, with no hand polishing.
Polishing (Ra 0.8μm / Ra 32μin or better)
Polishing is the process of creating a smooth and shiny surface by rubbing it or by applying a chemical treatment.
Bead Blasting
Machined parts are bead blasted with glass beads which results in a uniform grainy texture and reduced machining marks.
Tumbled
It is a process that tumbles vibrating media on machined parts to remove sharp edges and burrs.
Tumbling can be used to remove machine marks from exterior surfaces.
Bead blasted + Anodizing type II
The parts are bead blasted to #120 grit before being anodized type II—ideal for increasing the aluminum part’s corrosion resistance and cosmetic effects.
Bead blasted + Anodized type III (Hardcoat)
The parts are bead blasted to #120 grit before being anodized type III. Type III (Hard Coat) is thicker and adds a wear-resistant layer to Type II’s corrosion resistance, suitable for functional applications.
Black Oxide
Black oxide is a conversion coating that is used on steels to improve corrosion resistance and minimize light reflection.
Powder Coated
This is a finish of applying powdered paint to the components and then baking it in an oven, which results in a stronger, more wear- and corrosion-resistant layer that is more durable than traditional painting methods.
Chromate Conversion Coating
Chromate conversion coating is used to improve the corrosion resistance of aluminum and aluminum alloys while keeping their conductive properties. It is also applied as a base layer prior to priming and painting parts.
Plating
Include Nickel Plating, Silver Plating, Gold Plating, Zinc Plating, Chrome Plating, Tin Plating and etc, it is ideal to reduce corrosion, improve the appearance and function of solderability and electrical conductivity.
*Other surface finishes are also available. Learn more about our metal and plastic surface finishing capabilities here.
Our Quality Promise
- ISO 9001:2015
- Material certification
- First article inspection
- CMM Reports
- Tolerances: +/- 0.05mm Or Better On Request.
- Rework & refund policy
Why Choose ±3?
Saving Your Cost
You will save 30-50% of the cost because of our efficient production capacity and cost control.
High Precision Tolerances
Offering tolerances range from +/-0.001′′ to 0.005′′, depending on client specifications. We are experts in producing custom components.
On-demand Production
Our CNC milling services will support you from 1 pcs to 10k+ pcs, no matter prototype, low volume manufacture, or mass production.
Quality Assurance
As an ISO 9001:2015 certificated manufacturing company, we offer SGS, RoHS, material certifications, and inspection report for our customers.
CNC Machining FAQs
Do you have a minimum order quantity?
NO! – No minimum quantity! ±3 provides rapid prototypes and short to medium-run production machining services.
What type of design files does ±3 accept for quoting?
For the 3D drawing, we would prefer STEP, IGES, or X_T format. For the 2D drawing, we would prefer PDF format there are tolerances with the dimensions if possible.
How can I pay ±3?
±3 accepts payment in two ways: 1. Bank to bank wire transfer 2. PayPal
What general tolerances can Plus Minus Three Industrial Co., Ltd achieve?
General CNC Machining Tolerances on metal to +/- 0.005" (+/- 0.127 mm) following ISO 2768 unless otherwise specified. CNC Plastics and composites will be +/- 0.010”(+/- 0.254 mm).
What precision tolerances can ±3 achieve?
CNC Precision Machining Tolerances down to ±.0002" (0.005mm). ±3 can manufacture and inspect to tight tolerances per your drawing specifications.
How quickly can I get my parts?
Lead times are 2 to 3 weeks for prototypes and 4 weeks for production runs. Emergency and rush services are available.
Let's raise your project profit to the next level, NOW! →
Get an instant quote
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