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CNC Machining Service

Get instant quotes on metal and plastic machined parts. We can make prototypes, small-batch, or mass production parts in as fast as one day with free standard shipping on all US orders.

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Our Machining Services
How It Works
Design Guidelines
Why Xometry?
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Custom CNC Machining Services

Xometry provides custom CNC machining services to engineers, product developers, designers, and more through our vetted network of 5,000+ suppliers. Our highly qualified machine shops can make any custom design, simple or complex. We offer rapid CNC prototypes, small-batch machining, and high-volume production, with all orders serviced by Xometry from end-to-end. Simply upload a CAD file to the Xometry Instant Quoting Engine℠ to get a price, lead time, and design-for-manufacturability feedback on your custom CNC parts. We have a range of CNC metals and plastics as well as flexible production and shipping options to meet you at the perfect price and product development stage. 

Xometry guarantees the quality of your parts with our ISO 9001:2015 and AS9100D certified quality management system, ITAR registration, and to options add inspections, hardware traceability, material certifications, and CoCs. We accept technical drawings and have support teams to ensure you get your CNC machined parts at quality and on time.

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CNC Machining, Turning, and Milling

CNC milling machine machining part

CNC Milling Service

CNC Milled Prototypes and Production Parts in as Fast as 1 Day | AS9100D | ISO9001:2015 | ITAR Registered | Free Standard Shipping on All US Orders

CNC Milling Service
CNC turning occurring

CNC Turning Service

CNC Turned Prototypes and Production Parts in as Fast as 1 Day | AS9100D | ISO9001:2015 | ITAR Registered | Free Standard Shipping on All US Orders

CNC Turning Service
Xometry CNC Machining Capabilities
Maximum Part Size40” x 40” x 40” (1000 mm x 1000 mm x 1000 mm). We accommodate larger part volumes upon request.
Standard Lead Time3 business days
General TolerancesTolerances on metals will be held to +/- 0.005" (+/- 0.127 mm) in accordance with ISO 2768 unless otherwise specified. Plastics and composites will be +/- 0.010”.
Precision TolerancesFor metals, as low as +/- 0.001”
Minimum Feature Size0.020” (0.50 mm). This may vary depending on part geometry and chosen material.
Threads and Tapped HolesXometry can accommodate any standard thread size. However, we can also machine custom threads; these will require a manual quote review.
Edge ConditionSharp edges are broken and deburred by default; please specify if critical edges should be left sharp in your order notes
Surface FinishThe standard finish is as-machined: 125 Ra or better. Additional finishing options are available.

This table depicts the general tolerances for CNC machining. Learn more about our manufacturing standards.

How CNC Machining Works

CNC (computer numerical controlled) machining is a widely used manufacturing process that uses automated, high-speed cutting tools to form designs from metal or plastic stock material. Common CNC machines include 3-axis, 4-axis, and 5-axis milling machines, lathes, and routers. Machines may vary in how parts are cut—the workpiece may remain in place while the tool moves, the tool may remain in place while the workpiece is rotated and moved, or both the cutting tool and workpiece may move together. 

Skilled machinists operate CNC machines by programming tool paths based on the geometry of the final part. The part geometry information is provided by a CAD (computer-aided design) model. CNC machines can cut almost any metal alloy and rigid plastic with high precision and repeatability, which makes CNC machined parts suitable for nearly every industry including aerospace, medical, robotics, electronics, and industrial. Xometry offers over 40 materials ranging from commodity aluminum and acetal to advanced titanium and engineered plastics like PEEK and Teflon.

    Capabilities CNC Turning

    CNC Machined Metals

    CNC Machining Aluminum Alloys
    Aluminum AlloyDescription
    Aluminum 6061Our most popular machined metal. Easily machined and lightweight, perfect for prototypes, military, and aerospace applications.
    Aluminum 2024Used when a high strength-to-weight ratio is required, such as for gears, shafts, and fasteners. It is non-magnetic and heat treatable.
    Aluminum 5052Corrosion-resistant aluminum frequently used in sheet metal applications.
    Aluminum 6063Commonly used outdoors as architectural trim, railings, and door frames, 6063 aluminum has better machinability than 3003. It is non-magnetic and heat treatable.
    Aluminum 7050Preferred over 7075 aluminum for use in structural applications, 7050 is a high-strength material that resists fatigue and stress cracking. 7050 is non-magnetic and heat treatable.
    Aluminum 7075Harder and higher strength aluminum alloy good for high-stress parts in the aerospace industry.
    Aluminum MIC-6A cast aluminum plate often used for tooling and base plates.

    We can source additional alloys and tempers upon request. You can also review more information about aluminum for CNC machining.

    CNC Machining Bronze, Brass, and Copper Metals
    Copper 101Commonly known as Oxygen-Free Copper, this alloy is great for electrical conductivity.
    Copper 260 (Brass)A highly formable brass. Great for radiator components and decorative door hardware.
    Copper C110A multipurpose copper comes in all shapes and sizes. Often used in electrical applications.
    Copper C360 (Brass)A highly machinable brass. Great for prototyping gears, fittings, valves, and screws.
    Copper C932 (Bronze)The standard bearing bronze for light-duty applications. It is easily machinable and resistant to corrosion.

    We can source additional alloys and tempers upon request. You can also review more information about copper for CNC machining, bronze for CNC machining, and brass for CNC machining.

    CNC Machining Stainless Steel Metals
    Nitronic 60 (218 SS)A high-performance metal with high temperature and wear resistance. Its corrosion resistance is superior to 300-series stainless steel. Common in aerospace and flight parts.
    Stainless Steel 15-5This alloy offers corrosion resistance similar to stainless steel 304. It has improved workability, hardness, and corrosion resistance.
    Stainless Steel 17-4A high-strength, corrosion-resistant stainless alloy. This metal is easily heat treatable and is typically used in medical equipment.
    Stainless Steel 18-8One of the most commonly used stainless steels. It is also known as stainless steel 304.
    Stainless Steel 303A machinable, corrosion-resistant steel.
    Stainless Steel 316/316LA highly corrosion-resistant steel popular for medical devices.
    Stainless Steel 410A wear- and corrosion-resistant stainless steel used in fasteners, cutlery, nozzles, and tools. 410 stainless steel is magnetic.
    Stainless Steel 416Easily machinable but can be heat treated to increase strength and hardness. Stainless steel 416 has low corrosion resistance.
    Stainless Steel 420Contains more carbon than stainless 410 to give it increased hardness and strength when heat treated. Offers mild corrosion resistance, high heat resistance, and improved strength.
    Stainless Steel 440COne of the hardest stainless steels with a Rockwell of 58-60 HRC after heat treatment. 440C is common in bearing applications where high wear resistance is required.

    We can source additional alloys and tempers upon request. You can also review more information about stainless steel for CNC machining.

    CNC Machining Steel Metals
    Steel A36A standard architectural, low-carbon steel. This steel is weldable.
    Steel 1018The most prominent of the carbon steels. The low carbon content makes this steel ductile and suitable for forming and welding.
    Steel 1215A carbon steel that is easily machinable compared to other steels like 1018. 1215 steel offers an excellent surface finish.
    Steel 4130This steel offers great weldability without compromising impact resistance. It is often used in gears and fasteners.
    Steel 4140Additional chromium makes this steel corrosion and fracture resistant.
    Steel 4140PHA pre-hardened HRC 28-32 variant of 4140 steel, also known as chrome-moly steel.
    Steel 4340A structural steel with a very high tensile strength compared to 4140 alloys. 4340 can withstand extreme heat, wear, and impact.

    We can source additional alloys and tempers upon request. You can also review more information about steel for CNC machining.

    CNC Machining Titanium Metals
    Titanium (Grade 2)This metal has high strength, low weight, and high thermal conductivity. It is ideal for applications in the aerospace and automotive industries.
    Titanium (Grade 5)This metal has an excellent strength-to-weight ratio and the high aluminum content in Ti-6Al-4V increases strength. This is the most commonly used titanium, offering good corrosion resistance, weldability, and formability.

    We can source additional alloys and tempers upon request. You can also review more information about titanium for CNC machining.

    CNC Machining Zinc Metals
    Zinc AlloyThis is a continuous-cast alloy. Zinc alloy has good electrical conductivity and is highly resistant to corrosion. This alloy is readily treatable for painting, plating, and anodizing.

    We can source additional alloys and tempers upon request. You can also review more information about zinc for CNC machining.

    CNC Machined Plastics and Composites

    Machinable Plastics and Composites
    ABSHigh strength engineering plastic, used for many commercial products.
    AcrylicA clear glass-like plastic. Good wear and tear properties. Great for outdoor use.
    Acetal (Delrin)Resin with good moisture resistance, high wear-resistance, and low friction.
    Garolite G-10Constructed of an epoxy resin with fiberglass fabric reinforcement, and also called epoxy-grade industrial laminate and phenolic, this material offers high strength and low moisture absorption.
    HDPEHigh density polyethylene is a moisture and chemical-resistant plastic with good impact strength. The material is outstanding for outdoor applications as well as watertight containers or seals.
    Nylon 6/6Offers increased mechanical strength, rigidity, good stability under heat and/or chemical resistance.
    PC (Polycarbonate)With almost twice the tensile strength of ABS, polycarbonate has superior mechanical and structural properties. Used widely in automotive, aerospace, and other applications that require durability and stability.
    PEEKOffering excellent tensile strength, PEEK is often used as a lightweight substitute for metal parts in high-temperature, high-stress applications. PEEK resists chemicals, wear, and moisture.
    PolypropyleneHas excellent electrical properties and little or no moisture absorption. It carries light loads for a long period in widely varying temperatures. It can be machined into parts requiring chemical or corrosion resistance.
    PTFE (Teflon)This material surpasses most plastics when it comes to chemical resistance and performance in extreme temperatures. It resists most solvents and is an excellent electrical insulator.
    UHMW PEUltra-high molecular weight polyethylene. A general-purpose material. It offers a unique combination of wear and corrosion resistance, low surface friction, high impact strength, high chemical resistance, and does not absorb moisture.
    PVCPolyvinyl chloride (Type 1) is a highly chemical-resistant synthetic plastic, PVC is commonly in environments exposed to liquids or requires electrical insulation.

    We can source additional CNC machining plastics upon request. You can also review more information about our CNC plastics.

    Custom-sourced Materials

    In addition to over 40 CNC machining metal and plastic materials available for instant online pricing, we can custom source any material you need from within our network of 5,000 machine shops. If you do not see the material stock you are looking for, please choose "Custom" under the material drop-down in the Xometry Instant Quoting Engine℠. You can then submit your quote for manual review and our expert manufacturing team will reach out.

    Available CNC Machining Finishes
    Standard (As-Milled)

    The finish option with the quickest turnaround. Parts are left with visible tool marks and potentially sharp edges and burrs, which can be removed upon request. Surface finish is comparable to 125 uin Ra finish.

    Bead Blast

    The part surface is left with a smooth, matte appearance.


    This is a batch-based process that tumbles vibrating media to remove sharp edges and burrs on machined parts. Tumbling can remove machine marks on exterior surfaces. Parts over 8” may require a manual review.

    Anodized (Type II Or Type III)

    Type II  (MIL-A-8625, Type II) creates a corrosion-resistant finish. Parts can be anodized in different colors—clear, black, red, and gold are most common—and is usually associated with aluminum. Type III (MIL-A-8625, Type III, Class 1/2 "hardcoat") is thicker and creates a wear-resistant layer in addition to the corrosion resistance seen with Type II.

    Titanium Anodize

    A surface finish for titanium per AMS-2488 Type 2 specification. Also called Tiodize, this finish increases fatigue strength and the wear resistance of a part. Titanium anodized parts are common in aerospace and medical device manufacturing. Non-pigmented titanium anodize finishes will dull shine.

    PTFE Impregnated Hard Anodize

    A hard coat anodize process that embeds PTFE to create a self-lubricating, dry contact surface with Type 3 hard coat’s protective properties. This finish can be used on aluminum alloys or titanium and increases the service life of the product. This finish conforms to the AMS-2482 Type 1 Hard Coat Anodizing with Teflon (Non-Dyed).

    Chem Film (Chromate Conversion Coating)

    Provides corrosion resistance and good conductivity properties. Can be used as a base for paint. Can leave surface yellow/gold. Adds very little thickness, about 0.00001”-0.00004”. Chem film will conform to MIL-DTL-5541, TYPE I/II.


    Improves corrosion resistance for 200 and 300 series and precipitation hardened corrosion-resistant steels. Thickness is negligible, about 0.0000001”. Conforms to ASTM A967, AMS-QQ-P-35, MIL-STD-171, ASTM A380, or AMS 2700.

    Powder Coat

    This is a process where powdered paint is sprayed onto a part that is then baked in an oven. This creates a strong, wear- and corrosion-resistant layer that is more durable than standard painting methods. A wide variety of colors are available to create the desired aesthetic.


    An electrochemical process cleans steel parts to reduce corrosion and improve appearance, by making the metal brighter. Removes about 0.0001”-0.0025” of the metal. Conforms to ASTM B912-02.

    Electroless Nickel Plating

    Provides uniform nickel coating which offers protection from corrosion, oxidation, and wear on irregular surfaces. The finished part will be brighter. Thickness starts at .0001”. Conforms to MIL-C-26074.

    Silver Plating

    Silver offers high solderability and electrical conductivity but is susceptible to tarnish. Conforms to AMS QQ-S-365D. Thickness is about 0.00002” - 0.0003.”

    Gold Plating

    Gold Plating provides good corrosion and tarnish resistance with excellent solderability. Default application specification is MIL-G-45204 and ASTM B488, CLASS 00, 0, OR 1. Thickness is about 0.00002" - 0.00005."

    Zinc Plating

    Provides uniform zinc coating which offers protection from corrosion, oxidation, and wear on irregular surfaces. Conforms to ASTM B633-15.

    CNC Machining Design Guidelines
    Internal corner filletsDesign internal corner fillets to be 0.020” - 0.050” greater than a standard drill size for the radii. Follow a drill diameter to depth ratio of 1:6 (1:4 recommended) as a guideline for internal corner radii.
    Floor filletsDesign floor fillets smaller than corner fillets to allow the same tool to clear material from the interior.
    UndercutsAlways design undercuts to standard sizes and away from corners so they are accessible by the cutting tool.
    Tapped/threaded hole depthProvide tool clearance slightly beyond the tapped hole depth to ensure complete threads.
    ComplexityKeep the number of small cuts to a minimum to reduce costs; only design in the necessary features to balance function with aesthetic.

    To see more design-for-manufacturing recommendations, view our CNC Machining Design Guide.

    Applications of CNC Machining

    Xometry Illustration

    Rapid Tooling

    Because CNC machining can cut a high variety of fully dense, durable materials like aluminum 5052 and stainless steel, it is perfect for creating fixtures or molds.

    Xometry Illustration

    Rapid Prototyping

    The range of affordable metal alloys (like aluminum 6061) and plastics (like acetal or ABS) combined with the speed of our skilled machinists makes CNC machining a great option for prototyping.

    CNC Machining Services

    End-Use Production

    Performance-enhancing finishes, precision tolerances as low as +/- 0.001”, and certifiable material options make CNC machining an excellent technology for end-use parts.

    CNC machining services at Xometry

    Ready to Get a CNC Machining Quote?

    Why Choose Xometry for CNC Machining?

    Massive Network Capacity

    Endless Options

    Choose from thousands of possible combinations of CNC materials, finishes, tolerances, markings, and certifications for your order.

    Instant Quoting Engine

    Easy to Use

    Get your parts delivered right to your door without the hassle of CNC part sourcing, project management, logistics, or shipping.

    Guaranteed Quality

    Vetted Network

    We are ISO 9001:2015 certified and AS9100D compliant. Only the top 6% of machine shops that apply to become Suppliers make it through our qualification process.

    Download our CNC machining design guide today!

    Download the CNC Machining Design Guide

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