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CNC Milling

CNC milled prototypes and production parts in as fast as 1 day AS9100D | ISO9001:2015 | ITAR Registered

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Xometry's CNC Milling
CNC Materials
Types of CNC Mills
Benefits of CNC Milling
CNC Manufacturing Standards
Overview: What is CNC Machining?
Why Xometry?

High Quality Rapid CNC Milling

Xometry integrates seamlessly with over 5,000 qualified manufacturing partners, including US-based ITAR qualified and AS9100D registered CNC milling facilities. That massive network means that whatever your part, we have a shop and a machine that can make it. We support 3-axis, 4-axis, 5-axis milling, and right angle milling capabilities to help you rapidly create designs from simple straight lines to complex geometric shapes. Xometry offers instant pricing, on-demand lead times, and design-for-manufacturability feedback on materials and manufacturing processes for your custom CNC milled parts, no matter your industry.

You can get an instant quote from a 3D CAD file, or get 3 or more bids directly from highly-vetted suppliers in our new Digital RFQ Marketplace.

CNC Machining Materials

Materials Available at Xometry:
AluminumBronze/BrassCopperPlasticsSteel / Titanium / Zinc
Aluminum 5052Brass C360EPT Copper C110ABSAlloy Steel 4130, 4140
Aluminum 7075 & 7075-T6Brass 260Copper 101Acetal [Delrin]ASTM A36
Aluminum 6063-T5C932 M07 Bearing BronzeAcrylicStainless Steel 15-5, 17-4, 18-8, 303
Aluminum 7050-T7451G-10 GaroliteStainless Steel 303, 304, 316/316L
Aluminum MIC-6Nylon 6/6Stainless Steel 416, 420
Aluminum 6061-T6PEEKSteel, Low Carbon
Aluminum 2024-T3PolycarbonateSteel A36
PTFE [Teflon]Titanium Grade 2, Titanium 6Al-4V, Zinc Sheet Alloy 500
Ultra-High Molecular Weight Polyethylene

Review more information about our materials here.

Available Finishes

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 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 is thicker and creates a wear-resistant layer in addition to the corrosion resistance seen with Type II.

Powder Coat

This is a process where powdered paint is sprayed onto a part which 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.


Don’t see the finish you need? Submit an RFQ and we’ll look into a finishing process for you.

Types Of CNC Mills

The most widely used type of CNC milling machine. The full use of the X, Y, and Z directions makes a 3 Axis CNC mill useful for a wide variety of work.


This type of router allows the machine to rotate on a vertical axis, moving the workpiece to introduce more continuous machining.


These machines have three traditional axes as well as two additional rotary axes. A 5-axis CNC router is, therefore, able to machine 5 sides of a workpiece at in one machine without having to remove the workpiece and reset. The workpiece rotates, and the spindle head is able to also move around the piece. These are larger and more expensive.

Benefits of CNC Milling

CNC machined parts
Rapid Turnaround
CNC machined parts

Using the latest CNC machines, Xometry produces highly accurate, quick turn parts in as fast as 1 day. We also instantly quote CNC machined parts, cutting days off of your RFQ process.

High Precision Tolerances
CNC machining

Offers high-precision tolerances ranging from +/-0.001″ – 0.005″, depending on customer specs. We are the experts in making parts that are truly custom and ready to use.

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CNC Machining is perfect for prototyping and production production parts. Xometry's massive scale can help you scale up from testing phase to production runs of 100,000 parts of more.

Material Selection
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Choose from over 50 metal and plastic materials. CNC Machining offers a wide variety of certified materials.

Xometry's CNC Manufacturing Standards

Sharp edges will be broken and deburred by default. Critical edges that must be left sharp should be noted and specified on a print. For features of size (Length, width, height, diameter) and location (position, concentricity, symmetry) +/- 0.005”. For features of orientation (parallelism and perpendicularity) and form (cylindrical, flatness, circularity, and straightness) apply tolerances as follows:
Part LengthDistance Tolerance (+/- in.)Angularity Tolerance
0-12”Tolerance of 0.005”Angularity +/- ½ degree
Over 12”-24”Tolerance of 0.010”Angularity +/- ½ degree
Over 24"-36"Tolerance of 0.015625" (1/64)Angularity +/- 1 degree
Over 36"-60"Tolerance of 0.03125" (1/32)Angularity +/- 1 degree
Over 60"Tolerance of 0.0625" (1/16)Angularity +/- 1 degree

Overview: What is CNC Milling?

The Basics Of CNC Mills

CNC mills are automated cutting machines using a rotating spindle-head to cut away unwanted material. CNC milling machines come in a variety of sizes and different axis configurations. They are mainly utilized to cut harder metals but can work with workpiece materials ranging from plastic and aluminum to stainless steel and titanium.

How CNC Milling Works

CNC mills excel at profile cutting harder materials. Like all CNC machines, a CNC mill is controlled with G-Code created through CAM software. The Gg-Code instructs the machine where to move the tool head, how fast to spin the tool, how deep to cut, how to move the workpiece, and other factors relating to speed, feed rate, and coordination. The G-Code complexity depends on how many axes the milling machine has.

Mills can still be used for profile cutting of softer materials, but are not as cost-effective for that use as CNC routers. The main difference between these machines is that with a CNC router the workpiece remains stationary while the router cutting head is directed around the piece, while a CNC mill may move both tool head and workpiece. CNC mills are mainly used in industrial manufacturing, while CNC routing is more common for lower output manufacturing like woodworking.

CNC machined parts

Why choose Xometry for CNC Milling?

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.


Ready to get started on your CNC milling quote?

Other Benefits Of CNC Milling

CNC milling machines are built for precise manufacturing and repeatability which makes them perfect for rapid prototyping and low-to-high volume production runs. CNC mills can also work with a variety of materials from basic aluminum and plastics to more exotic ones like titanium — making them the ideal machine for almost any job.

    CNC Milling

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