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Email : quote@best-prototypes.com

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CNC MACHINING

Precision CNC machining solutions for plastic and metal parts, from prototype to full-scale production. We turn your ideas into high-quality parts with speed, accuracy and consistency.

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CNC Machining Services

We provide precision CNC machining for plastic and metal parts, supporting rapid prototypes, functional components, and scalable production with tight tolerances, consistent quality, and reliable manufacturing performance across different industries.

CNC Turned Components

High-precision turning for shafts, pins, and bushings. Seamlessly integrated with our 5-axis and milling capabilities to support complex, multi-step part production.

5-Axis CNC Milling Parts

Advanced multi-axis machining for complex geometries in a single setup, delivering high precision, better surface finish, and improved efficiency for demanding applications.

3-Axis / 4-Axis CNC Milling Parts

Cost-efficient machining for parts with simple to moderate geometries. Ideal for functional prototypes and stable production runs with consistent quality.

CNC Machining Materials

A wide range of metals and engineering plastics for prototyping and production parts.

Material	Typical Grades	Typical Dimensional Tolerance	Notes
Aluminum Alloys	6061, 6063, 7075, 5052, 5083, 6082, ADC12/A380	ISO 2768-f (Fine)	Standard tolerance per ISO 2768-f. Tighter tolerances available upon engineering review.
Stainless Steel	SUS303, SUS304, SUS316/316L, SUS420, SUS440C, 17-4PH	ISO 2768-f (Fine)	Standard tolerance per ISO 2768-f. Tighter tolerances available upon engineering review.
Carbon Steel & Alloy Steel	1018, 1045, 4140, S355, S420, A36, tool steels	ISO 2768-f (Fine)	Standard tolerance per ISO 2768-f. Tighter tolerances available upon engineering review.
Copper & Brass	C101/T2, C110, beryllium copper, C36000 brass	ISO 2768-f (Fine)	Standard tolerance per ISO 2768-f. Tighter tolerances available upon engineering review.
Bronze	Tin bronze and similar bronze grades	ISO 2768-f (Fine)	Standard tolerance per ISO 2768-f. Tighter tolerances available upon engineering review.
Magnesium	AZ31B, AZ91D	ISO 2768-f (Fine)	Standard tolerance per ISO 2768-f. Tighter tolerances available upon engineering review.
Titanium	TA1, TA2, TC4/Ti-6Al-4V	ISO 2768-f (Fine)	Standard tolerance per ISO 2768-f. Tighter tolerances available upon engineering review.
POM / PEEK / PAI	POM, PEEK, PAI and selected precision plastics	ISO 2768-m (Medium)	Standard tolerance per ISO 2768-m for plastics. Tighter tolerances available upon engineering review.
ABS / PC / PMMA / PBT / PET / PPS / PEI / Bakelite	Common engineering plastics	ISO 2768-m (Medium)	Standard tolerance per ISO 2768-m for plastics. Tighter tolerances available upon engineering review.
PA / Nylon / Glass-filled Nylon / HIPS / PS	PA, PA6/PA66, GF nylon, HIPS, PS	ISO 2768-m (Medium)	Standard tolerance per ISO 2768-m for plastics. Moisture absorption may affect final tolerance.
PP / PE / HDPE / LDPE / UPE / PTFE / FR-4	Soft plastics, low-friction plastics, composites	ISO 2768-m (Medium)	Standard tolerance per ISO 2768-m. Soft/flexible materials may require special fixturing.

CNC Machining Surface Finishes

Enhance performance, corrosion resistance, and appearance beyond the machined state. We offer a focused range of finishes to match your material, function, and timeline.

Nickel Plating

Adds a durable nickel layer for improved wear resistance, hardness, and corrosion protection. Common for functional components.

E-Coating (Electrophoretic Coating)

Applies an even, thin organic coating for excellent corrosion protection. Often used as a primer or standalone finish for steel parts.

Anodizing

Forms a hard, corrosionresistant oxide layer on aluminum. Available in clear, black, or colors for protection and aesthetics.

Grinding, Brushing & Polishing

Refining metal surfaces through mechanical grinding to remove tool marks and achieve a smooth base. We offer two primary finishing directions: Brushed finish, which creates a uniform linear grain for a clean, technical appearance; and Polished finish, which delivers a highly reflective, mirror-like surface suitable for decorative and optical parts.

Sandblasting / Bead Blasting

Creates a uniform matte texture that removes machining lines. Ideal for aluminum and stainless steel for a clean look.

Passivation

Chemical treatment removing surface contaminants and enhancing the natural corrosion resistance of stainless steel parts. Critical for medical, aerospace, and precision industrial applications.

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CNC Machining Across Industries

From first article to full production, our CNC machining delivers consistent precision. Multi-axis capabilities handle complex geometries with tight tolerances — whether you need 1 part or 10,000 parts.

CNC Machining Tolerances & Standards

Our standard for CNC machined parts follows ISO 2768. For metal materials (aluminum, steel, titanium), we apply the ISO 2768-f (Fine) grade. For plastic machining, we use ISO 2768-m (Medium) — balancing functional fit with practical part costs. On standard features, our equipment consistently holds tolerances within the Fine grade limits. If your project requires tighter control than the Fine grade allows, mark those critical dimensions clearly on your 2D drawing. We review every tight-tolerance feature with your engineering team upfront, so we can plan the right machining strategy — meeting your precision targets without unnecessary cost or extended lead times.

Basic Size Range (mm)	Fine (ISO 2768-f)	Medium (ISO 2768-m)	Coarse (ISO 2768-c)	Very Coarse (ISO 2768-v)
0.5 up to 3	± 0.05mm	± 0.1mm	± 0.2mm	–
over 3 up to 6	± 0.05mm	± 0.1mm	± 0.3mm	± 0.5mm
over 6 up to 30	± 0.1mm	± 0.2mm	± 0.5mm	± 1mm
over 30 up to 120	± 0.15mm	± 0.3mm	± 0.8mm	± 1.5mm
over 120 up to 400	± 0.2mm	± 0.5mm	± 1.2mm	± 2.5mm
over 400 up to 1000	± 0.3mm	± 0.8mm	± 2mm	± 4mm
over 1000 up to 2000	± 0.5mm	± 1.2mm	± 3mm	± 6mm
over 2000 up to 4000	–	± 2mm	± 4mm	± 8mm

Need expert guidance on your custom manufacturing project? Our engineering team can help optimize design for manufacturability, material selection, and process planning — ensuring quality, cost efficiency, and reliable delivery.

Consult Engineering Team

Precision CNC Machining

Precision CNC machining is about more than accuracy—it's about delivering reliable parts on time and at any production scale. From early-stage prototypes to high-volume manufacturing, our experienced team, advanced equipment, and efficient workflow help turn your designs into precision components with shorter lead times and consistent quality.

Engineering Support from Start to Finish

Our engineers work closely with your team to review designs, improve manufacturability, and recommend the most efficient machining solutions before production begins.

Prototype to Mass Production

Whether you need a single prototype or thousands of production parts, our manufacturing capacity scales with your project while maintaining consistent quality at every stage.

Precision for Complex Parts

From simple components to intricate geometries, every part is machined with tight tolerances and carefully inspected to ensure dimensional accuracy and repeatable performance.

As Fast as 8-Hour Machining

Time-sensitive project? Our optimized production process allows CNC parts to be completed in as fast as 8 hours, helping you shorten development cycles and keep projects moving.

CNC Machining FAQs

How do I get a CNC machining quote?

Send your 3D CAD (STEP/IGES/STP) with material, quantity, and finish notes. Our team replies in 1-2 business days with recommendations and a firm quote.

How do you ensure part quality?

In-process inspections plus final QC. Every design is reviewed for manufacturability and tolerance strategy before machining.

Can you handle both prototypes and mass production?

Yes — from single prototypes to thousands of parts, with consistent repeatability across all volumes.

What is your typical lead time?

Prototypes in days; production varies with complexity and quantity. Our 24/7 shop keeps timelines short, with engineering support responding within 12 hours.

What surface finishes are available?

As-machined, sanding/polishing, bead blasting, anodizing, powder coating, electroplating, brushing, and e-coating. Ra 0.2 μm achievable.

What tolerances can you achieve?

Standard to DIN 2768-1 Fine for metals, Medium for plastics. Tighter down to ±0.005 mm possible for critical features.

What materials can you machine?

Metals (aluminum, stainless steel, titanium, brass, copper) and engineering plastics (ABS, PC, Nylon, POM, PEEK, PTFE). Special alloys available on request.

What CNC machining services do you offer?

3-axis, 4-axis, and 5-axis milling, plus CNC turning. We handle prototyping, lowvolume, and highvolume production.

Join 3000+ Companies That Trust Best Prototypes for Precision Parts

Explore real case studies that showcase how our manufacturing capabilities drive product development from prototype to production.

Precision Twin-Bearing CNC Machined Housing

Precision CNC Machined Aluminum Impeller

Complex CNC Machined Aluminum Housing

CNC Machined Impeller Shaft

5-Axis CNC Milled Aluminum Flange Base

Start Your Manufacturing Project Today

Submit your CAD files and receive a fast quotation with professional DFM support.

Get a quote

+86 0769-21680692
+86 137 1200 5389

（Same for WhatsApp/WeChat)

Email : quote@best-prototypes.com

Address : Block 4, Longguang Innovation Park, Zhen'an East Road

No. 74,Chang'an Town,Dongguan,Guangdong, China

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