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.
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.
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 Turned Prototypes and Production Parts in as Fast as 1 Day | AS9100D | ISO9001:2015 | ITAR Registered | Free Standard Shipping on All US Orders
| Feature | Description |
|---|---|
| Maximum Part Size | 40” x 40” x 40” (1000 mm x 1000 mm x 1000 mm). We accommodate larger part volumes upon request. |
| Standard Lead Time | 3 business days |
| General Tolerances | Tolerances 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 Tolerances | For metals, as low as +/- 0.001” |
| Minimum Feature Size | 0.020” (0.50 mm). This may vary depending on part geometry and chosen material. |
| Threads and Tapped Holes | Xometry can accommodate any standard thread size. However, we can also machine custom threads; these will require a manual quote review. |
| Edge Condition | Sharp edges are broken and deburred by default; please specify if critical edges should be left sharp in your order notes |
| Surface Finish | The 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.
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.
| Aluminum Alloy | Description |
|---|---|
| Aluminum 6061 | Our most popular machined metal. Easily machined and lightweight, perfect for prototypes, military, and aerospace applications. |
| Aluminum 2024 | Used when a high strength-to-weight ratio is required, such as for gears, shafts, and fasteners. It is non-magnetic and heat treatable. |
| Aluminum 5052 | Corrosion-resistant aluminum frequently used in sheet metal applications. |
| Aluminum 6063 | Commonly used outdoors as architectural trim, railings, and door frames, 6063 aluminum has better machinability than 3003. It is non-magnetic and heat treatable. |
| Aluminum 7050 | Preferred 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 7075 | Harder and higher strength aluminum alloy good for high-stress parts in the aerospace industry. |
| Aluminum MIC-6 | A 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.
| Alloy | Description |
|---|---|
| Copper 101 | Commonly 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 C110 | A 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.
| Alloy | Description |
|---|---|
| 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 15-5 | This alloy offers corrosion resistance similar to stainless steel 304. It has improved workability, hardness, and corrosion resistance. |
| Stainless Steel 17-4 | A high-strength, corrosion-resistant stainless alloy. This metal is easily heat treatable and is typically used in medical equipment. |
| Stainless Steel 18-8 | One of the most commonly used stainless steels. It is also known as stainless steel 304. |
| Stainless Steel 303 | A machinable, corrosion-resistant steel. |
| Stainless Steel 316/316L | A highly corrosion-resistant steel popular for medical devices. |
| Stainless Steel 410 | A wear- and corrosion-resistant stainless steel used in fasteners, cutlery, nozzles, and tools. 410 stainless steel is magnetic. |
| Stainless Steel 416 | Easily machinable but can be heat treated to increase strength and hardness. Stainless steel 416 has low corrosion resistance. |
| Stainless Steel 420 | Contains 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 440C | One 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.
| Alloy | Description |
|---|---|
| Steel A36 | A standard architectural, low-carbon steel. This steel is weldable. |
| Steel 1018 | The most prominent of the carbon steels. The low carbon content makes this steel ductile and suitable for forming and welding. |
| Steel 1215 | A carbon steel that is easily machinable compared to other steels like 1018. 1215 steel offers an excellent surface finish. |
| Steel 4130 | This steel offers great weldability without compromising impact resistance. It is often used in gears and fasteners. |
| Steel 4140 | Additional chromium makes this steel corrosion and fracture resistant. |
| Steel 4140PH | A pre-hardened HRC 28-32 variant of 4140 steel, also known as chrome-moly steel. |
| Steel 4340 | A 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.
| Alloy | Description |
|---|---|
| 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.
| Alloy | Description |
|---|---|
| Zinc Alloy | This 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.
| Material | Description |
|---|---|
| ABS | High strength engineering plastic, used for many commercial products. |
| Acrylic | A 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-10 | Constructed 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. |
| HDPE | High 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 6/6 | Offers 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. |
| PEEK | Offering 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. |
| Polypropylene | Has 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 PE | Ultra-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. |
| PVC | Polyvinyl 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.
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.
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.
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.
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.
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.
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).
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.
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.
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 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 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."
Provides uniform zinc coating which offers protection from corrosion, oxidation, and wear on irregular surfaces. Conforms to ASTM B633-15.
| Feature | Description |
|---|---|
| Internal corner fillets | Design 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 fillets | Design floor fillets smaller than corner fillets to allow the same tool to clear material from the interior. |
| Undercuts | Always design undercuts to standard sizes and away from corners so they are accessible by the cutting tool. |
| Tapped/threaded hole depth | Provide tool clearance slightly beyond the tapped hole depth to ensure complete threads. |
| Complexity | Keep 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.
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.
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.
Performance-enhancing finishes, precision tolerances as low as +/- 0.001”, and certifiable material options make CNC machining an excellent technology for end-use parts.
Choose from thousands of possible combinations of CNC materials, finishes, tolerances, markings, and certifications for your order.
Get your parts delivered right to your door without the hassle of CNC part sourcing, project management, logistics, or shipping.
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.
