CNC Milling Services
iPrecision Parts provides precision CNC milling for custom metal and engineering plastic components, from prototypes to low-volume production. Tolerances down to ±0.005 mm are supported where required, with documented dimensional inspection.
Upload CAD Files for a QuoteTolerances down to ±0.005 mm
Prototypes to Low-Volume Production
Metals & Engineering Plastics
Trusted by companies worldwide
CNC MILLING CAPABILITIES
3-Axis, 4-Axis & 5-Axis CNC Milling Capabilities
We provide 3-axis, 4-axis, and 5-axis CNC milling for custom metal and engineering plastic parts, from prototypes to low-volume production.
3-Axis Milling
Ideal for flat surfaces, pockets, slots, hole patterns, and standard prismatic parts.
4-Axis Milling
Suitable for multi-side features, rotary indexing, and parts requiring fewer setups.
5-Axis Milling
Ideal for complex contours, multi-face features, and intricate parts requiring fewer setups.
CNC MILLING MATERIALS
Materials for CNC Milling
We machine a wide range of metals and engineering plastics to meet different requirements for strength,
weight, corrosion resistance, and performance.
weight, corrosion resistance, and performance.
Aluminum
Aluminum is lightweight, corrosion-resistant, and highly machinable. It is widely used for precision components in automotive, electronics, automation, and other industrial applications.
Common Grades
6061
7075
5052
6082
5083
Stainless Steel
Stainless steel offers excellent corrosion resistance, strength, and durability. It is widely used for precision components in medical, automation, electronics, and industrial applications.
Common Grades
303
304
316
17-4PH
416
Steel
Steel offers high strength, durability, and excellent mechanical performance. It is widely used for machine components, fixtures, tooling, and demanding industrial applications.
Common Grades
1018
1045
4140
4340
A36
12L14
Brass
Brass offers excellent machinability, corrosion resistance,
and good electrical conductivity. It is commonly used for
fittings, connectors, valves, electrical components,
and precision hardware.
Common Grades
C360
C260
C464
C353
C377
C385
Titanium
Titanium combines high strength, low weight, excellent corrosion resistance, and good performance at elevated temperatures. It is widely used for aerospace, medical, automotive, and high-performance precision components.
Common Grades
Grade 2
Grade 5
Grade 9
Ti-6Al-4V
Engineering Plastics
Engineering plastics offer low weight, corrosion resistance, electrical insulation, and excellent wear properties. They are widely used for precision components, insulators, guides, bushings, and industrial automation parts.
Common Materials
POM / Delrin
Nylon
ABS
PC
PEEK
PTFE
CNC MILLING SPECIFICATIONS
CNC Milling Tolerances & Specifications
Our CNC milling capabilities support tight tolerances, complex geometries, and consistent quality for prototypes and low-volume production.
Maximum Part Size
1500 × 800 × 500 mm
Standard Tolerance
±0.01 mm Typical
ISO 2768 Available
Tight Tolerance
Down to ±0.005 mm
Subject to part geometry and material
Positional Accuracy
±0.01–0.03 mm
Surface Roughness
Ra 0.4–3.2 μm
Down to Ra 0.4 μm
Maximum Part Size
1000 × 600 × 400 mm
Standard Tolerance
±0.01 mm
Typical Range
Tight Tolerance
Down to ±0.005 mm
Subject to part geometry and material
Positional Accuracy
±0.01–0.03 mm
Surface Roughness
Ra 0.4–3.2 μm
Down to Ra 0.4 μm
Maximum Part Size
600 × 500 × 500 mm
Standard Tolerance
±0.01 mm
Typical Range
Tight Tolerance
Down to ±0.005 mm
Subject to part geometry and material
Positional Accuracy
±0.01–0.03 mm
Surface Roughness
Ra 0.4–3.2 μm
Down to Ra 0.4 μm
General tolerances may follow ISO 2768 where applicable. Critical dimensions, GD&T, threads, and special requirements are manufactured and inspected according to customer drawings.
SURFACE FINISHING FOR CNC MILLING
Surface Finishing Options
We offer a range of surface finishes to meet your functional, aesthetic, and performance requirements.
As-Machined
Visible machining marks
Anodizing
Protective colored oxide finish
Bead Blasting
Uniform matte appearance
Powder Coating
Durable colored coating
Electropolishing
Smooth and bright finish
Passivation
Enhances corrosion resistance
Black Oxide
Black finish for mild corrosion resistance
As-Machined
Standard CNC-machined finish with visible tool marks.
Typical Finish
Ra 1.6–3.2 μm
Typical Materials
Aluminum, Steel, Stainless Steel
Best For
Prototypes, functional components, fit-check parts
Anodizing
Electrochemical oxide finish that improves corrosion resistance, wear resistance, and appearance.
Typical Finish
Type II / Type III
Typical Materials
Aluminum
Best For
Corrosion resistance, wear protection, decorative parts
Bead Blasting
Creates a uniform matte surface by blasting fine media onto the machined part.
Typical Finish
Uniform Matte
Typical Materials
Aluminum, Steel, Stainless Steel
Best For
Cosmetic parts, glare reduction, pre-anodizing preparation
Powder Coating
Durable dry-powder coating that provides a protective and decorative colored surface.
Typical Finish
Matte / Satin / Gloss
Typical Materials
Aluminum, Steel
Best For
Durable color finishes, outdoor parts, protective housings
Electropolishing
Electrochemical polishing process that smooths the surface and produces a clean, bright finish.
Typical Finish
Smooth / Bright
Typical Materials
Stainless Steel
Best For
Medical parts, food equipment, corrosion-resistant components
Passivation
Chemical treatment that removes surface contaminants and improves the natural corrosion resistance of stainless steel.
Typical Finish
Clean / Satin
Typical Materials
Stainless Steel
Best For
Corrosion-resistant parts, medical components, food-processing equipment
Black Oxide
Chemical conversion coating that produces a dark black finish with mild corrosion resistance and minimal dimensional change.
Typical Finish
Matte Black
Typical Materials
Carbon Steel, Alloy Steel
Best For
Machine components, tooling, fasteners, low-reflective parts
Other finishes and custom requirements are available upon request. Please indicate your surface finish requirements on your drawing or RFQ.
CNC MILLED PARTS
Examples of CNC Milled Parts
Examples of CNC milled components for automation, machinery, electronics, and other industrial applications.
Housings & Enclosures
Precision housings, covers, and equipment enclosures.
Complex Machined Parts
Complex multi-face components with pockets, bores, and precision features.
Jigs & Fixtures
Precision fixture plates, locating components, and workholding parts.
Structural Brackets
Precision brackets, supports, and mounting components.
Finned Housings
Machined housings with integrated cooling fins for industrial equipment.
Precision Plates
Custom base plates, mounting plates, and structural components.
Need Precision CNC-Milled Parts?
Send us your CAD files and project requirements for engineering review and quotation.
FAQ
Frequently Asked Questions
Common questions about our CNC milling capabilities, tolerances, materials, and production.
What is CNC milling best suited for?
CNC milling is ideal for parts with flat surfaces, pockets, slots, holes, contours, and complex 3D features, including housings, brackets, plates, fixtures, and structural components.
How tight can CNC milling tolerances be?
Typical CNC milling tolerances are around ±0.01 mm. Depending on the material, geometry, size, and critical features, tighter tolerances down to ±0.005 mm may be achievable after engineering review.
What materials can you CNC mill?
We CNC mill aluminum, stainless steel, carbon and alloy steels, brass, copper, titanium, and engineering plastics such as POM, PEEK, PTFE, PC, ABS, and nylon.
Can you machine complex geometries and deep features?
Yes. Our 3-axis, 4-axis, and 5-axis milling capabilities support complex pockets, angled features, multiple surfaces, compound geometries, and difficult-to-access areas. Feasibility depends on feature depth, tool access, and part geometry.
What file formats can I send for a quotation?
We accept common 3D and 2D formats including STEP, STP, IGES, PDF, DWG, and DXF. STEP files are preferred for most CNC milling projects.
Do you support prototypes and low-volume production?
Yes. We support one-off prototypes, small batches, low-volume production, and repeat orders with consistent process control and inspection.