The United States drives global demand for precision-machined parts, with industries like aerospace, medical devices, and electronics depending on tight tolerances and fast turnaround. To keep up, many companies now rely on online CNC machining services that provide advanced machining processes, material options, and quality assurance in one platform.
Instead of trading emails and waiting days for quotes, engineers can upload a 3D model, select materials, and get instant pricing with accurate lead times. Most platforms also provide manufacturability checks and order tracking, making it easier to refine designs and scale production when needed.
This article reviews some of the best online CNC machining services in the US, explains how they work, and how to determine the right partner.
How Does Online CNC Machining Work?
CNC machining refers to cutting material with a computer numerical control machine. The process starts with a 3D CAD model, which is translated into CNC machine data known as G-code. That data directs the cutting tools to remove material from the stock until the final geometry is achieved.
Online CNC machining enables engineers to obtain faster pricing, improved visibility, and access to a broader range of suppliers. The workflow follows a clear sequence:
- CAD upload: Starts by allowing engineers to create a 3D model in STEP or IGES format and upload it to a secure portal. The platform records material, quantity, and tolerance requirements while automatically scanning the geometry and surface features.
- Automated quoting: Uses algorithms to analyze geometry, material, and machining complexity. It generates instant pricing and lead-time estimates, eliminating delays from manual bidding and providing transparency into cost drivers.
- Design for manufacturability feedback: Delivers automated checks that flag thin walls, deep pockets, or overly tight tolerances. Engineers can adjust designs before production, which reduces revisions and prevents costly delays.
- Production: Routes to a machine shop within the provider’s network. Multi-axis mills and lathes cut the parts, while inspectors confirm tolerances. Continuous machine operation shortens lead times and supports consistent quality.
- Finishing and inspection: Follows up with secondary operations such as deburring, anodizing, plating, or polishing. Parts then undergo quality checks using coordinate measuring machines (CMMs) or optical inspection systems, ensuring they meet required specifications.
- Delivery: Concludes with packaging and shipment. Platforms often integrate with logistics providers for real-time tracking and, in some cases, connect directly with ERP systems to support repeat orders.
Best Online CNC Machining Services in the US
CNC machining services all have unique offers; some focus on rapid prototyping, while others support large‑scale production or specialise in complex materials. Here’s a list of the best online CNC machining services in the US.
1. Quickparts
Year founded: 1990
Headquarters: Seattle, Washington, USA
Quickparts offers engineering and manufacturing services, including CNC machining, that support projects ranging from single prototypes to high-volume production runs. The company works with both in-house manufacturers and a global network of suppliers to guarantee capacity, while the QuickQuote® platform provides instant pricing and lead times.
Quickparts brings technical expertise and strict quality assurance to every project. Its CNC operators average over a decade of experience, and its facilities operate under ISO 9001:2015 certification and ITAR registration. Customers across aerospace, medical, automotive, and electronics industries depend on Quickparts as a single-source supplier for complex parts and systems that require precision, scalability, and integration across multiple processes.
CNC solutions:
- CNC milling: Produces precision parts with complex geometries and smooth surface finishes. The process removes material from a stationary workpiece using rotating tools, enabling the production of prototypes, functional components, and high-volume orders. It supports metals and polymers, including aluminum, stainless steel, brass, copper, acetal, nylon, PEEK, and polycarbonate. Parts are inspected to maintain dimensional accuracy within ±0.001.
- CNC turning: Creates cylindrical and conical components by rotating the workpiece against a stationary tool. This method is used for shafts, bushings, tubes, and threaded features. Quickparts supports both prototype and production runs, with capacity secured through its global network of machining partners. Pre-production design reviews are conducted to identify and address tolerance or geometry issues before manufacturing commences.
Other manufacturing services:
- Additive manufacturing: Supports stereolithography (SLA), selective laser sintering (SLS), direct metal printing (DMP), fused deposition modeling (FDM), and other digital fabrication methods for prototyping and end-use parts.
- Sheet metal fabrication: Includes laser cutting, water jetting, stamping, bending, welding, and finishing processes to produce enclosures and assemblies across materials like aluminum, stainless steel, brass, and titanium.
- Die casting: Provides traditional die casting using both hot-chamber (zinc) and cold-chamber (aluminum) methods for small- to mid-sized metal parts with consistent surface quality and dimensional repeatability.
- Cast urethane: Produces cast urethane prototypes and master patterns for investment casting applications, offering support from pattern through low-volume casting. This is a great solution for low-volume manufacturing of molded parts.
- Injection molding: Provides tooling and molding solutions from rapid prototypes to multi-cavity, high-volume production. Capabilities include insert molding, overmolding, stack molding, hot runner molds, and complex tooling with tolerances down to ±0.07 mm.
- Rapid prototyping: Supports fast-turn prototypes across multiple manufacturing processes to help validate designs and iterate quickly.
2. Astro Machine Works
Year founded: 1984
Location: Ephrata, Pennsylvania
Astro Machine Works provides CNC machining services that automate milling, turning, and other operations with computer-driven commands. The company refines its machining processes to match industry standards and produces complex parts with high accuracy. Its services include 5-axis machining, CNC milling, prototyping, and other custom machining solutions designed to meet application-specific requirements.
The company also offers CNC turning, EDM, plasma cutting, and water jet cutting. These processes support the production of parts with intricate shapes, tight tolerances, and specialized geometries. Astro Machine Works serves industries including aerospace, defense, healthcare, consumer electronics, and energy by delivering components that meet strict dimensional requirements.
CNC solutions:
- CNC mills: Remove material from stationary workpieces with rotating tools, ideal for rectangular or square components.
- CNC lathes: Rotate workpieces around cutting tools to create cylindrical parts, holes, threads, and slots.
- CNC plasma cutters: Melt and remove material with plasma torches to form components with complex profiles.
- CNC electric discharge machines (EDM): Erode conductive material with electrical discharge sparks to achieve fine details.
- CNC water jet cutters: Cut shapes and holes with high-pressure water mixed with abrasives, preventing heat distortion.
Other manufacturing services:
- Custom machine building: Designs and manufactures specialized machinery, handling all phases from welding to final assembly.
- Machine repair, rebuilding, and refurbishment: Troubleshoots, restores, and retrofits existing equipment to extend service life.
- Panel wiring and control systems: Builds custom control panels with PLCs, CPUs, alarms, and power systems for industrial machines.
- Reverse engineering: Recreates or modifies unavailable or obsolete parts using CAD modeling and solid modeling software.
3. Baker Industries
Year founded: 1992
Location: Macomb, Michigan
Baker Industries, a Lincoln Electric Company, provides manufacturing services for large-scale and complex projects. The company combines advanced technology with specialized staff to address customer requirements across industries such as aerospace, defense, automotive, medical equipment, oil and gas, shipbuilding, and heavy equipment. Its capabilities extend from CNC machining and fabrication to additive manufacturing, automation, and assembly.
Baker Industries also offers design and engineering support, quality inspection, and on-site installation.
CNC solutions:
- CNC milling: Performs precision milling with advanced 3-axis, 5-axis, and 7-axis machines for parts ranging from a few inches to over 100 feet.
- CNC turning: Produces cylindrical and conical parts using multi-axis turning equipment for small and large components.
- CNC boring and drilling: Creates holes, cavities, and large bores with horizontal and vertical boring mills.
- CNC tapping and threading: Machines threaded features and tapped holes for assemblies and tooling.
Other manufacturing services:
- Fabrication and welding: Produces welded assemblies and fabricated components.
- Design and engineering: Converts concepts into manufacturable parts.
- Assembly and finishing: Provides system assembly and coatings.
- Quality inspection and testing: Uses advanced metrology for compliance.
- On-site installation: Deploys teams to install equipment at customer facilities.
4. eMachineShop
Year founded: 1999
Location: Mahwah, New Jersey
eMachineShop allows users to design parts, upload CAD files, and receive real-time cost estimates with automated feedback on potential issues before placing orders. The system streamlines the process from concept to production by removing the need for third-party design tools and separate quoting systems.
The company offers custom part manufacturing across metals, plastics, and composites. It focuses on prototypes and low-volume production but can also scale to medium quantities. Customers use eMachineShop for applications such as brackets, enclosures, gears, panels, and other hardware, supported by a network of manufacturing partners in the US and internationally.
CNC solutions:
- CNC milling: Uses rotary cutting tools to produce 3D shapes and complex geometries in metals and plastics.
- CNC turning: Machines cylindrical parts such as shafts, bushings, and threaded components by feeding tools into rotating stock.
- Wire and sinker EDM: Removes material with electrical sparks to create sharp corners and intricate cavities in conductive materials.
- CNC routing: Cuts sheet materials like plastics, composites, and soft metals with rotating tools for flat or contoured parts.
Other manufacturing services:
- Sheet metal fabrication: Provides waterjet cutting, laser cutting, tapping, bending, and finishing for custom sheet metal parts.
- Injection molding: Produces moderate to large quantities of plastic components with repeatable quality.
- 3D printing: Delivers rapid prototypes and short-run production parts in plastics and metals.
5. Fictiv
Year founded: 2013
Location: San Francisco, California
Fictiv operates a digital manufacturing platform that connects buyers with a managed global network of partners instead of producing parts in-house. The company oversees quoting, manufacturability analysis, quality inspections, and logistics centrally, while vetted suppliers handle production. Its platform emphasizes fast turnaround, automated DFM feedback, and order tracking for both prototypes and production.
CNC solutions:
- CNC milling: Machines parts with 3-, 4-, and 5-axis capabilities to handle simple and complex geometries.
- CNC turning: Produces cylindrical components such as pins, shafts, and spacers, with live tooling support for complex features.
- Electrical discharge machining (EDM): Uses wire and sinker EDM to cut deep pockets, sharp internal corners, and complex cavities in conductive materials.
Other manufacturing services:
- 3D printing: Offers FDM, SLS, SLA, PolyJet, and MJF technologies for prototypes and end-use parts.
- Sheet metal fabrication: Delivers cut, bent, and formed sheet metal components.
- Die casting: Manufactures precision metal parts with consistent repeatability.
- Compression molding: Produces durable molded components with reduced tooling costs.
- Urethane casting: Supplies low-volume production-quality parts without tooling investment.
6. Modern Forge Companies
Year founded: 1914
Location: Merrillville, Indiana
Modern Forge Companies delivers precision CNC machining services supported by in-house engineering and tooling design. Its machining processes use computer controls across multiple axes to cut, shape, and remove material with a variety of specialized tools. The company provides high-volume CNC-machined parts to meet customer requirements across industrial applications.
In addition to machining, Modern offers forging, tube fabrication, robotic welding, and assembly as part of its contract manufacturing capabilities. CNC operations cover milling, drilling, tapping, contouring, slotting, shaping, and threading. The company also supplies parts for demanding industries such as aerospace, agriculture, defense, firearms, powersports, heavy trucks, and energy.
CNC solutions:
- CNC milling: Removes material with rotary cutting tools to create precise shapes and geometries.
- CNC drilling: Creates holes of various sizes and depths in machined components.
- CNC turning: Rotates workpieces against cutting tools to manufacture cylindrical components.
- CNC cutting: Applies controlled machining to separate or shape raw material stock.
Other manufacturing services:
- Tube fabrication: Provides custom steel and aluminum tube fabrication with in-house tooling design and advanced equipment for high-volume projects.
- Forging: Manufactures custom forged parts with engineering and metallurgical support to deliver durable, high-quality components.
7. Norck
Year founded: 2009
Location: Irvine, California
Norck delivers on-demand CNC machining, sheet metal fabrication, 3D printing, and injection molding for companies in aerospace, defense, robotics, automotive, energy, electronics, and industrial sectors. Its operations rely on advanced equipment, a distributed supplier network, and engineering expertise to support both prototypes and high-volume production.
The company’s CNC capabilities include milling, turning, grinding, honing, EDM, and precision cutting with laser, plasma, and waterjet technologies. Engineers also provide design-for-manufacturability feedback to optimize cost, lead time, and efficiency before production begins.
Solutions:
- CNC milling: Removes material with rotary tools to shape parts, from prototypes to production, including complex geometries and fine features.
- CNC turning: Rotates workpieces against cutting tools to manufacture cylindrical components, with mill-turn options for added complexity.
- CNC grinding: Uses abrasive wheels to refine surfaces, remove small amounts of material, and improve dimensional accuracy.
Services:
- Sheet metal fabrication: Produces custom sheet metal parts with laser cutting, plasma cutting, and waterjet processes.
- 3D printing: Produces plastic and metal parts with advanced 3D printing methods, supporting both rapid prototypes and high-volume production runs.
- Injection molding: Provides scalable plastic part production with a range of molding options.
- Urethane casting: Supplies low-volume molded components without the cost of hard tooling.
8. PartsBadger
Year founded: 2016
Location: Cedarburg, Wisconsin
PartsBadger provides online CNC machining services designed around accessibility and speed. Customers can upload files and receive instant pricing through the Instant Quote tool, or use the Rapid Quote system for higher volumes and special features. Orders move directly into production with confirmation and shipment tracking, simplifying the entire process from quoting to delivery.
Solutions:
- 3-axis milling: Machines 2.5D and 3D parts by moving along X, Y, and Z axes.
- 4- and 5-axis milling: Rotates parts or mills for complex contours and shapes.
- Turning: Produces cylindrical parts up to 32 inches long using lathes.
- Swiss machining: Manufactures small, precise parts with high accuracy and speed.
- Wire EDM: Cuts material with a thin wire and electrical discharge, achieving near 90° corners.
Services:
- Sheet metal fabrication: Performs laser cutting, bending, and forming for custom enclosures and brackets.
- Injection molding: Produces molded plastic parts for both prototype and production runs.
- 3D printing: Creates plastic and metal components with additive manufacturing for rapid iteration or low-volume needs.
- Urethane casting: Supplies short-run molded parts without tooling investment, suitable for functional testing.
9. Prototek
Year founded: 1987
Location: Contoocook, New Hampshire
Prototek provides CNC machining and digital manufacturing services that support both prototyping and production. Customers begin by uploading CAD files through the Prototek IQ platform, where the system delivers instant or engineer-assisted quotes and design-for-manufacturability (DFM) feedback. Once approved, projects move into production and through certified quality control before shipping nationwide.
The company supports industries such as aerospace, defense, medical, energy, automotive, and consumer products. With ISO 9001:2015, AS9100D, and ITAR certifications, Prototek manages parts from single prototypes to large-scale production, offering access to a wide range of metals, plastics, and composites.
Solutions:
- CNC milling: Produces precision parts across multiple axes for small or large geometries.
- CNC turning: Machines cylindrical and threaded parts with tight tolerances.
- CNC routing: Cuts and shapes larger flat stock or panel-based materials.
- Wire and sinker EDM: Forms intricate cavities, sharp corners, and complex features.
Services:
- 3D printing: Offers additive processes including laser sintering, multi-jet fusion, stereolithography.
- Sheet metal fabrication: Performs bending, forming, laser cutting, and waterjet cutting for enclosures, brackets, and structural parts.
- Casting and molding: Provides silicone, urethane, wax, and injection molding to support both prototype and production needs.
10. Xometry
Year founded: 2013
Location: North Bethesda / Gaithersburg, Maryland, USA
Xometry operates an AI-driven online marketplace that connects buyers with a vetted network of manufacturers, rather than producing parts in its own facilities. It handles quoting, engineering evaluation, quality assurance, and project management centrally, while relying on external partners for actual manufacturing.
Its platform supports a wide array of fabrication methods, including injection molding, CNC machining, 3D printing, sheet metal, and more, with certifications such as ISO 9001:2015, ISO 13485, AS9100D, and IATF 16949.
Solutions:
- CNC turning: Produces cylindrical and threaded parts with live tooling for complex features.
- CNC routing: Handles sheet materials with quick-turn capability for prototypes and small batches.
- High-volume machining: Supports scalable production runs with networked suppliers.
Services:
- 3D printing: Offers polymer and metal additive processes for prototypes and production through its partner network.
- Sheet metal, die casting, and urethane casting: Broad range of processes supplied through vetted external manufacturers.
- Assembly and secondary services: Manages post-processing, kitting, and turnkey assembly through its supplier network.
Partner with the Best Online CNC Machining Service Company in the US
Selecting a CNC machining supplier that can handle both prototypes and production ensures smoother transitions, fewer errors, and faster delivery. A reliable CNC machining partner also provides flexibility in tooling, strong material support, and technical input early in the process to keep projects on track.
Quickparts gives businesses the ability to accelerate development, minimize risks, and scale production with confidence. Its manufacturing model adapts to different timelines and complexity levels, combining precision with efficiency across every stage of production.
You get direct access to engineering support early in the process, so issues are caught before they become costly. With Quickparts, you’re not just getting parts, you’re getting control, visibility, and consistent results across every phase.
Need a quote? Upload your CAD files through the QuickQuote platform and get fast, transparent pricing along with DFM input and material recommendations, so you can make informed decisions before tooling even begins.
Ready to create your prototype or start production?
Get your free quote with Quickparts today!
Online CNC Machining Services FAQs
What industries use CNC machining?
CNC machining is used across industries that require precise, repeatable parts. In the automotive industry, it produces engine blocks, transmission housings, suspension components, and brackets that demand strength and tight tolerances. Aerospace relies on CNC for turbine blades, landing gear parts, and structural components where accuracy and material integrity are critical.
Medical and dental companies machine implants, surgical instruments, and diagnostic devices from stainless steel and titanium for safety and compliance. Industrial machinery and robotics depend on CNC for gears, frames, and custom hardware, while electronics and consumer product manufacturers use it for housings and enclosures.
What are the size limitations for CNC machining?
CNC machining has defined size limitations that depend on the machine type and axis travel. Milling machines typically handle parts up to around 2000 mm × 750 mm × 600 mm, while specialized gantry mills can exceed 10,000 mm in length.
CNC turning centers accommodate diameters up to about 930 mm and lengths up to 4000 mm, whereas drilling machines are generally limited to plates around 2400 mm in length, 1000 mm in width, and 60 mm in thickness.
What are some advantages and challenges to expect in CNC machining?
CNC machining offers high precision, repeatability, and versatility, making it suitable for both prototyping and production. It supports a wide range of materials, maintains tight tolerances, and allows for efficient scaling from single parts to large batches.
However, it also comes with challenges such as higher costs compared to processes like casting or molding, machine size limitations for very large parts, and reliance on skilled operators for programming and calibration.
Quickparts addresses these challenges by offering capacity for both low- and high-volume runs, supported by a global network that ensures timely delivery. Their instant quoting platform also provides fast and transparent pricing, helping teams plan projects without delays or hidden costs.
What are the most common materials used in CNC machining?
CNC machining commonly uses metals such as aluminum, steel, stainless steel, brass, copper, and titanium, which provide strength and durability for demanding applications. Plastics like ABS, nylon, acetal (Delrin), polycarbonate, PEEK, and PTFE are also widely used, offering lightweight and corrosion-resistant alternatives for functional parts. Composite materials and specialty alloys, such as Inconel or tool steel, are applied in aerospace, medical, and industrial sectors where performance under high stress or temperature is required.