CNC Machining

CNC Machining
Precision CNC Machining Services

Custom metal and plastic parts with precision CNC machining from prototype to production.

  • 3-, 4- & 5-axis milling, turning, routing & EDM
  • Metals and engineering plastics for functional and end-use parts
  • Complex multi-sided, thin-wall & tight-fit components
  • CMM inspection, material certs & traceability available
ISO 9001:2015 | ISO 13485:2016 | IATF 16949:2016
Precision CNC Machining Services
±0.0025 mm
5-Axis Accuracy
1500 mm
Max Milling Length
1–100K
No MOQ
3 Days
Fastest Lead Time

Which CNC Machining Process Is Right for Your Part?

Process Best For Key Advantage Engineering Consideration
CNC Milling Housings, brackets, pockets, plates Flexible for prismatic and multi-face parts Internal corners need cutter radii; deep pockets increase tool deflection
CNC Turning Shafts, pins, bushings, sleeves Fast machining with good concentricity Best when most geometry is rotational
Mill-Turn Turned parts with holes, flats, slots Combines turning and milling in fewer setups Useful when feature-to-feature alignment matters
CNC Routing Large panels and lightweight parts Large working area and fast material removal Not usually the first choice for ultra-tight metal features
5-Axis CNC Multi-sided parts, complex surfaces Fewer setups and better feature relationships More demanding programming, fixturing, and inspection
EDM Narrow slots, sharp features, hard metals No cutting force and excellent feature access Conductive materials only; generally slower than cutting
Grinding Flat and precision surfaces High flatness, size control, and surface quality Usually used as a secondary precision process
Custom CNC Machining for Complex Projects

Custom CNC Machining for Complex Projects

Complex CNC parts become difficult where geometry, workholding, tolerances, material behavior, and finishing interact. We review datum strategy, tool access, thin walls, deep pockets, GD&T, threads, critical fits, and post-finish dimensions before machining.

Precision & Tolerance Capabilities

CNC accuracy depends on material, part size, geometry, workholding, tool access, and inspection method; tighter tolerances are best reserved for dimensions that control fit, alignment, sealing, or function.
Process / Capability Precision Capability Typical Surface Roughness Size / Inspection Capability Engineering Consideration
CNC Milling Down to ±0.005 mm Ra 1.6–3.2 μm Up to 1500 × 1050 × 600 mm Thin walls, deep pockets, and long tool reach can reduce dimensional stability
5-Axis CNC Machining Down to ±0.0025 mm Ra 1.6–3.2 μm Multi-face machining in fewer setups Best for critical feature relationships, compound surfaces, and complex multi-sided parts
CNC Turning Down to ±0.005 mm Ra 0.8–1.6 μm Part size depends on machine and stock form Diameter, roundness, concentricity, and slender-part deflection are key controls
Precision Grinding Down to 0.002 mm Ra 0.2–0.8 μm Precision flat and external surfaces Usually used as a secondary process for final size, flatness, and surface control
Sinker EDM Down to 0.003 mm Ra 0.8–1.6 μm Work envelope up to 600 × 400 × 400 mm Suitable for deep cavities and hard conductive materials where cutting access is limited
Wire EDM Down to ±0.001–0.003 mm Ra 0.2–0.6 μm Fine contours and narrow profiles Conductive materials only; useful where cutting force or tool access is a concern
CMM Inspection Measurement accuracy down to 0.0017 mm — Measuring range 1000 × 700 × 660 mm Measurement capability supports verification; it is not the same as guaranteed machining tolerance

CNC Machining Materials

Aluminum
Stainless Steel
Steel
Brass
Copper
Titanium
Zinc
Bronze
Magnesium
ABS
Delrin® / POM
Polycarbonate
Nylon
Acrylic / PMMA
PTFE
PEEK
ULTEM®
FR-4 / Garolite
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum
Aluminum

Aluminum combines low weight, good machinability, and corrosion resistance. 6061 is a practical general-purpose choice, while 7075 provides higher strength but usually costs more and offers lower corrosion resistance.

Key Characteristics

High strength-to-weight ratio

Excellent machinability

Good corrosion resistance

Suitable for cosmetic finishing

Common Grades

6061, 6063, 5052, 2024, 7075

Typical Applications

Housings, brackets, robotics, electronics, automotive and aerospace structures

Available Finishes

As-Machined, Anodizing, Bead Blasting, Powder Coating, Painting, Polishing

Stainless Steel
Stainless Steel
Stainless Steel
Stainless Steel
Stainless Steel
Stainless Steel
Stainless Steel
Stainless Steel
Stainless Steel
Stainless Steel
Stainless Steel
Stainless Steel
Stainless Steel

Stainless steel is selected for strength, corrosion resistance, and long-term durability. 303 machines more easily, while 304 and 316 offer stronger corrosion performance but generally require more machining time.

Key Characteristics

High corrosion resistance

High strength

Good wear resistance

Suitable for demanding environments

Common Grades

303, 304, 316, 316L, 17-4 PH, 420

Typical Applications

Medical equipment, industrial machinery, marine parts and process equipment

Available Finishes

As-Machined, Passivation, Electropolishing, Brushing, Polishing

Steel
Steel
Steel
Steel
Steel
Steel
Steel
Steel
Steel
Steel
Steel
Steel
Steel

Steel provides high strength, toughness, and wear resistance for structural and heavily loaded components. Heat treatment can increase hardness but may affect final dimensions, so machining sequence matters.

Key Characteristics

High strength and toughness

Good wear resistance

Heat-treatable

Cost-effective for structural parts

Common Grades

1018, 1215, 4130, 4140, 4340, A2, O1

Typical Applications

Machine components, tooling, fixtures and structural assemblies

Available Finishes

As-Machined, Black Oxide, Plating, Powder Coating, Painting

Brass
Brass
Brass
Brass
Brass
Brass
Brass
Brass
Brass
Brass
Brass
Brass
Brass

Brass offers excellent machinability, dimensional stability, conductivity, and good appearance. C360 is particularly suitable for high-speed precision machining.

Key Characteristics

Excellent machinability

Good dimensional stability

Corrosion resistant

Electrically conductive

Common Grades

C260, C360

Typical Applications

Connectors, valves, fittings and instrument components

Available Finishes

As-Machined, Polishing, Nickel Plating, Chrome Plating

Copper
Copper
Copper
Copper
Copper
Copper
Copper
Copper
Copper
Copper
Copper
Copper
Copper

Copper is chosen primarily for electrical and thermal conductivity. Pure copper is softer and more prone to burrs and tool loading than free-machining alloys, so cutting strategy matters.

Key Characteristics

Excellent electrical conductivity

High thermal conductivity

Good corrosion resistance

High ductility

Common Grades

C101, C110

Typical Applications

Busbars, heat sinks, electrical contacts and thermal components

Available Finishes

As-Machined, Polishing, Plating

Titanium
Titanium
Titanium
Titanium
Titanium
Titanium
Titanium
Titanium
Titanium
Titanium
Titanium
Titanium
Titanium

Titanium combines high strength, low weight, and corrosion resistance. Its low thermal conductivity concentrates heat at the cutting edge, increasing tool wear and machining time.

Key Characteristics

High strength-to-weight ratio

Excellent corrosion resistance

Heat resistant

Biocompatible

Common Grades

Grade 2, Grade 5 / Ti-6Al-4V

Typical Applications

Aerospace structures, medical components, robotics and performance equipment

Available Finishes

As-Machined, Bead Blasting, Polishing

Zinc
Zinc
Zinc
Zinc
Zinc
Zinc
Zinc
Zinc
Zinc
Zinc
Zinc
Zinc
Zinc

Zinc alloys are useful for cost-sensitive mechanical and decorative parts where moderate strength and corrosion resistance are sufficient.

Key Characteristics

Cost-effective

Good corrosion resistance

Relatively easy to machine

Suitable for plating

Common Grades

Zinc Alloys

Typical Applications

Mechanical components, hardware and decorative parts

Available Finishes

As-Machined, Plating, Powder Coating, Painting

Bronze
Bronze
Bronze
Bronze
Bronze
Bronze
Bronze
Bronze
Bronze
Bronze
Bronze
Bronze
Bronze

Bronze combines wear resistance, corrosion resistance, and low-friction behavior, making it useful for sliding and load-bearing components.

Key Characteristics

Good wear resistance

Low friction

Corrosion resistant

Good dimensional stability

Common Grades

C932, Tin Bronze

Typical Applications

Bushings, bearings, wear plates and mechanical components

Available Finishes

As-Machined, Polishing

Magnesium

Magnesium is selected where very low weight matters. It machines efficiently but requires controlled chip handling because fine magnesium chips can be combustible.

Key Characteristics

Very low density

Good machinability

High strength-to-weight ratio

Suitable for lightweight structures

Common Grades

AZ31B, AZ91D

Typical Applications

Aerospace, electronics, lightweight housings and structural components

Available Finishes

As-Machined, Conversion Coating, Painting

ABS

ABS is a practical material for functional prototypes and housings that need toughness and impact resistance without high material cost.

Key Characteristics

Good impact resistance

Lightweight

Cost-effective

Easy to machine

Common Grades

Standard ABS

Typical Applications

Functional prototypes, housings and consumer products

Available Finishes

As-Machined, Sanding, Painting

Delrin® / POM

POM offers low friction, wear resistance, and good dimensional stability, making it useful for moving mechanical components.

Key Characteristics

Low friction

Good dimensional stability

Wear resistant

Low moisture absorption

Common Grades

Delrin 100, Delrin 150

Typical Applications

Gears, bearings, bushings and mechanical assemblies

Available Finishes

As-Machined, Fine Surface Finishing

Polycarbonate

Polycarbonate combines high impact resistance with optical transparency. Machining heat and internal stress should be controlled where optical appearance matters.

Key Characteristics

High impact resistance

Transparent

Tough and durable

Good dimensional stability

Common Grades

Standard PC

Typical Applications

Protective covers, guards, enclosures and transparent components

Available Finishes

As-Machined, Polishing

Nylon

Nylon provides good strength, wear resistance, and low friction. Moisture absorption can change dimensions, so environmental conditions matter for close-tolerance parts.

Key Characteristics

Good wear resistance

High toughness

Low friction

Lightweight

Common Grades

Nylon 6, Nylon 6/6

Typical Applications

Gears, rollers, bearings and wear components

Available Finishes

As-Machined

Acrylic / PMMA

Acrylic provides high transparency and good cosmetic appearance but is more brittle than polycarbonate and requires careful machining around thin or sharp features.

Key Characteristics

High optical clarity

Good weather resistance

Lightweight

Good polishability

Common Grades

PMMA

Typical Applications

Displays, lighting covers, windows and optical components

Available Finishes

As-Machined, Polishing

PTFE

PTFE offers exceptional chemical resistance and very low friction. Its softness and tendency to creep make very tight dimensional control more difficult.

Key Characteristics

Excellent chemical resistance

Very low friction

High temperature resistance

Non-stick surface

Common Grades

Virgin PTFE, Filled PTFE

Typical Applications

Seals, bearings, insulation and chemical-processing components

Available Finishes

As-Machined

PEEK

PEEK is used where high temperature, chemical resistance, mechanical strength, and dimensional stability are required.

Key Characteristics

High temperature resistance

Excellent chemical resistance

High mechanical strength

Good dimensional stability

Common Grades

PEEK Natural, PEEK GF30, Medical-Grade PEEK

Typical Applications

Medical, semiconductor, aerospace and industrial components

Available Finishes

As-Machined, Fine Surface Finishing, Polishing

ULTEM®

ULTEM provides high strength, heat resistance, dimensional stability, and flame-resistant performance for demanding engineering applications.

Key Characteristics

High temperature resistance

Good dimensional stability

Flame resistant

High strength

Common Grades

ULTEM 1000, ULTEM 2300

Typical Applications

Aerospace interiors, electrical insulation and medical equipment

Available Finishes

As-Machined

FR-4 / Garolite

Garolite combines structural strength with electrical insulation. Glass reinforcement is abrasive, so tooling and dust control are important during machining.

Key Characteristics

Excellent electrical insulation

High stiffness

Moisture resistant

Lightweight

Common Grades

G10, G11

Typical Applications

Electrical insulators, fixtures and structural components

Available Finishes

As-Machined

Surface Finishing Options for CNC Machined Parts

Finish Best For Suitable Materials Engineering / Dimensional Consideration
As-Machined Functional parts, internal components, fastest lead time Most machinable metals & plastics Tool marks remain; specify roughness only where function requires it
Bead Blasting Uniform matte cosmetic surfaces Aluminum, stainless steel, titanium, brass Can soften appearance of sharp edges; critical surfaces may need masking
Type II Anodizing Color and corrosion protection Aluminum Coating growth can affect bores, threads, and tight fits
Type III Hard Anodizing Wear-resistant functional surfaces Aluminum Thicker than Type II; allowance or masking may be required on precision interfaces
Powder Coating Durable exterior protection Aluminum, steel, stainless steel Relatively thick coating; usually mask threaded and mating features
Passivation Corrosion resistance without a decorative coating Stainless steel Minimal dimensional change; does not hide machining marks
Electroless Nickel Plating Wear, corrosion protection, uniform metal coverage Steel, aluminum, copper alloys Plating thickness must be considered on precision fits and bores
Black Oxide Low-build dark finish Steel Small dimensional effect but less corrosion protection than thicker coatings
Polishing / Electropolishing Cosmetic, cleanability, reduced roughness Stainless steel, aluminum, brass, copper Can round edges or alter local surface geometry if heavily processed
Laser Marking Permanent identification and traceability Most metals and selected plastics Minimal dimensional impact; appearance varies by material and finish
Chem Film / Chromate Conversion Corrosion protection with minimal buildup Aluminum Lower dimensional impact than anodizing; useful where conductivity or tight interfaces must be retained

CNC Machining Equipment & Inspection Capabilities

Processing Equipment

Processing Equipment

Processing Equipment

Processing Equipment

Processing Equipment

Processing Equipment

Why Choose Mastars for CNC Machining?

Certified Quality Systems
ISO 9001, ISO 13485, and IATF 16949 certified processes help ensure consistent quality across industrial, medical, and automotive projects.
100+ Engineering Professionals
Work directly with experienced engineers for DFM reviews, tolerance recommendations, and manufacturing support—without unnecessary back-and-forth.
5+ Production Bases
Flexible manufacturing capacity supports both urgent prototypes and scalable production without single-site bottlenecks.
No Minimum Order Quantity
Order one part or thousands—without unnecessary volume commitments or tooling investments.
DFM Review on Every Order
Identify manufacturability risks early to reduce redesign cycles, save costs, and improve part performance before production begins.
800+ Customers Served
Trusted by global engineering teams across industrial equipment, medical devices, robotics, automotive, and consumer products.

Certifications

ISO9001:2015 Certificate

ISO9001:2015 Certificate

IATF16949:2016 Certificate

IATF16949:2016 Certificate

ISO13485:2016 Certificate

ISO13485:2016 Certificate

Medical A-Class Supplier

Medical A-Class Supplier

Partners

Auer Lighting
Bentley
Aston Martin
NVIDIA
Compac
Auer Lighting
Bentley
Aston Martin
NVIDIA
Compac

How CNC Machining Works

Upload Your Design

Share your CAD files, drawings, quantity, material, and any critical requirements.

Get an Engineer-Reviewed Quote

Receive pricing, lead time, and manufacturability feedback based on your part requirements.

Production Begins

Once you approve your quote, manufacturing starts — from prototype tooling to full-scale runs.

Parts Shipped

Finished parts are inspected, packaged, and shipped with the required quality documentation.

What Our Customers Say

Jessica Malkovich

Jessica Malkovich

Company: MastarsJob Title: designerBusiness: mastars
Sofia made the entire process seamless! Her expertise and dedication helped us find our dream home quickly.
Jessica Malkovich

Jessica Malkovich

Company: MastarsJob Title: designerBusiness: mastars
Sofia made the entire process seamless! Her expertise and dedication helped us find our dream home quickly.
Jessica Malkovich

Jessica Malkovich

Company: MastarsJob Title: designerBusiness: mastars
Sofia made the entire process seamless! Her expertise and dedication helped us find our dream home quickly.
Jessica Malkovich

Jessica Malkovich

Company: MastarsJob Title: designerBusiness: mastars
Sofia made the entire process seamless! Her expertise and dedication helped us find our dream home quickly.
Jessica Malkovich

Jessica Malkovich

Company: MastarsJob Title: designerBusiness: mastars
Sofia made the entire process seamless! Her expertise and dedication helped us find our dream home quickly.

CNC Machining FAQs

  • How much does CNC machining cost?

    It depends on material, stock size, machining time, setups, tolerance, finish, inspection, and quantity. Need a more accurate estimate? Submit your part drawings and requirements to get a quote tailored to your project.

  • How fast can you deliver CNC machined parts?

    Simple parts can ship in as fast as 3 days. Complex 5-axis geometry, hard materials, tight tolerances, or specialty finishing may require more time.

  • What CNC machining tolerances can you achieve?

    Critical CNC features can reach ±0.005 mm, with ultra-precision 5-axis machining down to ±0.0025 mm for suitable parts.

  • Can you support prototypes and production parts?

    Yes. There is no MOQ, with support from a single prototype through repeat production up to 100,000 units.

  • What materials can you CNC machine?

    We machine aluminum, steel, stainless steel, titanium, copper, brass, and engineering plastics including ABS, POM, PC, nylon, PTFE, PEEK, and ULTEM.

  • What files should I send for a quote?

    A STEP or IGES file is enough to start. Add a 2D drawing for GD&T, critical tolerances, threads, finishes, or inspection requirements.

  • How do you inspect CNC machined parts?

    Inspection can include dimensional checks, CMM, optical measurement, FAI, material verification, and project-specific inspection reports.

  • What happens if a part is out of tolerance?

    Confirmed nonconforming parts are isolated and reviewed against the drawing, datum scheme, process, and inspection method before corrective action is agreed.

  • What surface finishes are available?

    Options include anodizing, bead blasting, powder coating, passivation, plating, black oxide, polishing, electropolishing, painting, and laser marking.

Tell Us About Your Project

Share your project details and files with us. Rough information is fine to start. Our engineering consultant will contact you within 24 hours.

Verification code