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CNC Machining Service

Machined Metal and Plastic Prototypes & Production Parts in as Fast as 1 Day | AS9100D | ISO9001:2015 | ITAR Registered

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Our Machining Services
Applications and Benefits
About CNC Machining
Why Xometry?
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High Quality CNC Machined Parts

Xometry is the industry leader in custom, quick-turn CNC machining services for rapid prototyping and production parts. Our online Instant Quoting Engine gives you a CNC machining quote from 3D files within seconds. Then we make your machined metal or plastic parts and get them to your door in as fast as 1 day. We inspect the parts and guarantee their quality. You can also get 3 or more bids directly from highly-vetted suppliers in our new Digital RFQ Marketplace.

Our massive partner network means that whatever your part, we have a shop and a machine that can make it. We integrate seamlessly with over 5,000 vetted manufacturing partners globally including over 4,000 in the U.S. With such a high number of qualified shops and over 40 engineering-grade materials available, using Xometry takes the guesswork out of CNC part sourcing. Xometry's quality management system is ISO 9001:2015 and AS9100D certified and ITAR registered. Our partners support the latest in CNC machining and turning processes, can support a high level of part complexity, and provide exceptional surface finishes. We can also machine and inspect your technical drawing, always ensuring you have the CNC machined parts you need, at-quality, and on time.

CNC machined 3-, 4-, and 5-axis metal parts

CNC Machining, Turning, and More

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

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

CNC Turning Service

CNC Machined Metals

Aluminum Alloy
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.

Additional alloys and tempers are available upon request. We can source to your project specifications. Review more information about our materials here.

Bronze, Brass, and Copper Alloy Machined Metals
Copper 101Commonly known as Oxygen-Free Copper, this alloy is great for electrical conductivity.
Copper 260 (Brass)A highly formidable 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.

Additional alloys and tempers are available upon request. We can source to your project specifications. Review more information about our materials here.

Stainless Steel Machined Metals
Stainless Steel 15-5Offers corrosion resistance similar to Stainless 304. Improved workability, hardness, and high corrosion resistance.
Stainless Steel 17-4A high strength, corrosion resistant stainless alloy. Easily heat treatable. Typically used in medical equipment.
Stainless Steel 18-8One of the most commonly used stainless steels. 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 416Easily machinable but can be heat treated to increase strength and hardness. 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.

Additional alloys and tempers are available upon request. We can source to your project specifications. Review more information about our materials here.

Steel Machined Metals
Steel 1018The most prominent of the carbon steels. The low carbon content makes this steel ductile and suitable for forming and welding.
Steel 4130Offers great weldability without compromising impact resistance. Often used in gears and fasteners.
Steel 4140Additional chromium makes this steel corrosion and fracture resistant.
Steel A36A standard architectural, low-carbon steel. Weldable.

Additional alloys and tempers are available upon request. We can source to your project specifications. Review more information about our materials here.

Titanium Machined Metals
Titanium (Grade 2)High strength, low weight, and high thermal conductivity. Ideal for applications in the aerospace and automotive industries.
Titanium (Grade 5)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.

Additional alloys and tempers are available upon request. We can source to your project specifications. Review more information about our materials here.

Zinc Machined Metal
Zinc AlloyContinuous-cast alloy. Zinc alloy has good electrical conductivity and is highly resistant to corrosion. This alloy is readily treatable for painting, plating, and anodizing.

Additional alloys and tempers are available upon request. We can source to your project specifications. Review more information about our materials here.

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.
Delrin (Acetal)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.
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.

Additional materials are available upon request. We can source to your project specifications. Review more information about our materials here.

Custom Sourced Materials

A variety of CNC machined metal and plastic part options are available for an instant online quote. If you do not see the material stock you are looking for, please choose "Custom" under the material drop-down on your quote page and submit for an expert engineering review once you have specified features, tolerances, inspection needs, and quantities required.

Available Finishes for CNC Machined Projects
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.

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.

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 toMIL-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.00002”-.0003”.

Gold Plating

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

CNC machining services at Xometry

Ready to get a CNC machining quote?

Applications of CNC Machining

Rapid tooling

Rapid Tooling

Because CNC can be applied to virtually any material, it is perfect for rapid tooling, i.e., creating fixtures or molds.

Fast parts and fast shipping

Rapid Prototyping

The range of materials available, low cost per unit, and speed of production makes CNC a great option for prototyping.

Part Production

End-Use Production

High-quality finish, vast material options and precise tolerances have made CNC a favorable technology for end-use parts.

Advantages of CNC Machining

CNC machined parts
Rapid Turnaround
CNC machined parts

With instant pricing and the latest CNC machines, Xometry produces highly accurate, quick turn parts in as fast as 1 day.

High Precision Tolerances
CNC machining in process

Offers high-precision tolerances ranging from +/-0.001″ – 0.005″, depending on customer specs.

Material Selection
aluminum and plastic materials

CNC Machining offers a wide variety of certified materials.

Custom Finishes
Powder coating metal parts

Select from a variety of finishes on solid metal and plastic parts, built to precise design specifications.

Machined metal parts scale to production through CNC services

CNC Machining is perfect for the production of 1 to 10,000+ parts.

CNC General Tolerances

DescriptionGeneral Tolerance
Distance DimensionsFor features of size (Length, width, height, diameter) and location (position, concentricity, symmetry) +/- 0.005”.
Orientation and Form Dimensions0-12" +/- 0.005", Angularity 1/2 degree. For 24" and beyond please consult Xometry's Manufacturing Standards.
Edge ConditionSharp edges will be broken and deburred by default. Critical edges that must be left sharp should be noted and specified on a print.

Please check out Xometry's Manufacturing Standards for more information on tolerances per process. Unless we have agreed to other tolerances in your Quote, we will work to achieve and hold the tolerances noted.

An Overview of CNC Machining

The Basics Of CNC Machining

CNC (Computer Numerical Controlled) machining is a means to remove material with high precision machines, using a wide variety of cutting tools to create the final design. Common CNC machines include vertical milling machines, horizontal milling machineslathes, and routers.

How CNC Machining Works

To successfully make a part on a CNC machine, skilled machinists create programmed instructions using CAM (Computer Aided Manufacturing) software in conjunction with the CAD (Computer Aided Design) model provided by the customer. The CAD model is loaded into the CAM software and tool paths are created based on the required geometry of the manufactured part. Once the tool paths are determined, the CAM software creates G-Code (machine code) that tells the machine how fast to move, how fast to turn the stock and/or tool, and where to move the tool or workpiece in a 5-axis X, Y, Z, A, and B coordinate system.

CNC milling and CNC machining services

Why Use CNC Machining For Your Parts?

The benefits of CNC machining are numerous. Once a tool path is created and a machine is programmed, it can run a part 1 time, or 100,000 times. CNC machines are built for precise manufacturing and repeatability which makes them cost-efficient and highly scalable. CNC machines can also work with a variety of materials from basic aluminum and plastics to more exotic materials like titanium — making them the ideal machine for almost any job. That's why CNC machining is one of the most popular methods of making plastic and metal components.

    CNC Mill at work

    Why Choose Xometry for CNC Machining?

    Massive Network Capacity

    Endless Options

    Choose from millions of possible combinations of 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 sourcing, project management, logistics, or shipping.

    Guaranteed Quality

    Vetted Network

    Only the top 6% of shops that apply to become Partners make it through our multi-tiered qualification process, so you can be confident your part will be made right.

    Download our CNC machining design guide today!

    Download the CNC machining design guide

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