Custom Metal & Plastic Parts Manufacturer Since 2002

  • Free instant quote in 24H.

  • China parts manufactuer direct–Competitive price. 

  • ISO9001:2015 Quality assurance.

CNC Machined Parts

Our Services

SWISS CNC Machining

SWISS CNC Machining Service

High precision Complex parts CNC large batch Rapid Machining with incredible accuracy, efficiency and cheap price.
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CNC Turning

CNC Turning Service

Can quickly CNC Turned Parts more than 50 materials, metals and plastics such as aluminum, copper, zinc, magnesium, etc., whether it is large or small parts.
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CNC Milling

CNC Milling Service

With 3, 4, 5 axis milling equipment to manufacturing various complex parts,  can quickly drill, engrave, and mill any prototype you want.
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CNC Machining Service

CNC Machining Service

3-axis,4-axis,5-axis CNC machining equipment with advanced cnc turning / milling / casting process helps you to achieve from design to machined parts online.
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Die Casting Service

Die Casting Service

Die casting is the process of choice when producing high volumes of complex metal parts.Cheap price.
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About Us

Shenzhen Best Parts Co., Ltd

—-We are leading company in Online CNC machining parts on demand, We provide specific prototype solutions for global customers.

Shenzhen Best Parts Co., Ltd is a professional online CNC machining service supplier in China. Founded in 2002. Our plant area has already exceeded 6000㎡. We Started as prototype and OEM parts manufacturing in the year of 2002 by CNC machine. With the capabilities of CNC Machining, CNC turning, CNC milling, SWISS CNC precision machining, Die casting, Finishing and assembly etc.. Best parts provides online one-stop service from parts design,instant quote to rapid prototyping and mass productions…

Why you can trust BEST Parts to manufacturing?

Quality Assurance: We strictly implement ISO quality standards and have received ISO 9001: 2015 certification. This means our production lines feature advanced technologies that give manufacturing precision and accuracy. With sophisticated measuring and testing equipment in house, we check all incoming material and parts to meet your specifications. That’s why we are outstanding among the rapid prototyping companies in China. Learn more about our quality control system. What’s more:

Instant CNC Quoting Online

Generally, quotations will be delivered in 24 hours after submitting RFQs with clear information.

Factory Direct Machining Capabilities

Our in-house facilities allow us to quickly complete your project. Since we have multiple CNC turning, milling and die-casting equipment.

Fast Turnaround

Own equipment, unlimited capacity, experienced engineers and flexible production systems allow us to create your prototypes and production parts in no time.

20+ Years in Parts Manufacturing Online

Having carried out rapid prototyping and custom parts machining online for 20 years, our engineers have built up rich experience. We can handle all types of projects.

10000+ Projects Delivered

Over 10K projects have been sent to our customers worldwide in the past 20 years, and we have received countless positive comments.

2000+ Happy Customers

Our goal is to keep every customer happy with reliable quality, fast turnaround and great services. We want all our new customers to become long-term customers.

We’re Your Partner From Prototyping to Production and Beyond

Best parts offer one-stop solutions to help you develop effective prototypes and scale up to production parts. Make custom parts on-demand using over 50 materials and 10 processes. Put our network of over 1,000 highly vetted manufacturers and our skilled applications engineering team to work for you.

Our Capability

CNC Machine Shop

Best Parts  equiped tools and equipments such as:

  • 20 CNC Lathes
  • 16 CNC Milling machines
  • 8 CNC Machining Machines(3-axis, 4-axis, 5-axis)
  • 18 SWISS CNC Machines
  • 30 Die Casting Machines
  • 2 Laser Engraving Machines


  • 3D measurement
  • Hardness Tester
  • Altimeter
  • spectrum analyzer
  • Surface Roughness Tester
CNC Machining

The maximum size of the parts we can process depends on the maximum stroke of the equipment, the following is the stroke data table of our equipment.

Processing Travel range
CNC Machining Center(3-axis / 4-axis / 5- axis)  1000*500*500mm / 850 * 500 * 500mm
CNC Lathe Ø430mm,Length 1200mm
CNC Milling Machine 600 * 500mm / 800 * 400mm
Parts inspection

Unless we follow the tolerances required in the customer’s drawings, we will strive to achieve and maintain the following tolerances, which will vary depending on your choice of primary machining. (Example: round hole 10mm, tolerance +0.01—0.03mm)

Dimension Range (mm)

Fine (F)


Medium (M)


Coarse (C)


Very Coarse (V) +/-
0.5-3 0.01 0.05 0.1
3-6 0.03 0.1 0.15 0.5
6-30 0.05 0.15 0.3 1.0
30-120 0.1 0.3 0.5 1.5
120-400 0.2 0.5 1.2 2.5
400-1000 0.3 0.8 2.0 4.0


Surface finishing

We can do surface treatment according to customer needs, the processing methods are as follows:

  • Anodized
  • Polishing
  • Nickel plating
  • Zinc plating
  • Brushing
  • Laser engraving
  • Oxide black
  • Heat treatment
  • Sandblasting
  • Electrophoresis etc.

Materials for Your CNC Machined Parts

Best Parts uses a wide selection of materials for the manufacture of our custom parts. And there are ample stocks, each material has different grades and varieties. Rest assured, the material has a quality inspection certificate, if you want to use a specific material in the machining of parts, please feel free to contact us!

Metal Plastic
Aluminum Acrylic
Brass PTFE
Copper HDPE
Bronze Teflon
Steel PC(Polycarbonate)
Stainless Steel PVC
Titanium Ultem
Zinc PP(Polypropylene)
Magnesium ABS Plastic
CNC Material
Quality Assurance

Quality Assurance

With more than 20 years of manufacturing and processing experience, we already have a comprehensive production and processing process and quality control system, and carry out strict inspections on materials, processing, finished products, shipments and other links to ensure product quality and on-time delivery.

The company has passed a number of quality management system certifications, and has been committed to providing customers with efficient and high-quality products and services.


  • ISO9001:2015
  • IATF16949
  • AS9100
  • GJB9001C-2017

Latest Cases

We manufacture CNC lathe parts, milled parts, precision Swiss machined parts, which are widely used in the fields of medical, electronic equipment, automotive industry, aerospace, intelligent robotics and industrial automation.

How to Work With Us?

Since the establishment of best parts in 2002, we have reached long-term cooperative relationships with 2000+ US and European customers. It is very simple to cooperate with us. Just fill in the form to get in touch with us, and you can get a one-to-one project manager to give you quotations and projects. Advising services that make it easy for you to get rapid prototyping and mass production of your products.

1 Upload a CAD File

To start, simply select a manufacturing process and upload a 3D CAD file.

2 Analysis and Online Quote

We’ll send you design for manufacturability (DFM) analysis and real-time pricing in 24 hours.

3 Parts Manufacturing

Once you review your quote and place your order, we’ll start the parts manufacturing process.

4 Parts are Shipped!

Our digital manufacturing process allows us to produce parts in as fast as 1 day.

Trusted by

With 2000+ partners around the world, Best Parts is supported and recognized by many internationally renowned brand companies.

Customer Testimonials


Nick Nafsinger

United States
The BEST Parts team is excellent to work with. They are very responsive and the quality of the parts we ordered is exceptional. We've been doing business with them for several years now and look forward to continue working with them.

Darrell Harris

United States
Very satisfied, the tolerance is very well grasped, I look forward to the next cooperation


Product is of good quality. Supplier provided QC report and photos before shipping. They were attentive not only before I finalized my order, but afterwards as well. My order arrived early and was of exceptional quality and packaging- A++++ reccomend!

Custom Parts or Prototype Manufacturing, Start to Get Free Quote for 1-10000 PCS.