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CNC machining is one of the most versatile manufacturing processes available today, capable of producing precision metal parts from a remarkably wide range of materials. From lightweight aluminum alloys used in aerospace to corrosion-resistant stainless steel for medical devices, the material you choose determines the strength, weight, cost, and performance of your finished part. In this guide, we look at the metal materials that CNC machining can process and how to select the right one for your project.
Aluminum is the most widely machined metal in CNC shops, and for good reason. It is lightweight, corrosion-resistant, and cuts quickly, which keeps both cycle times and costs low. Common grades include 6061-T6, the general-purpose alloy ideal for brackets, housings, and structural components; 7075-T6, a much stronger grade favored in aerospace and high-stress applications; and 6082, a medium-strength alloy popular for heavy-duty structures. Aluminum is an excellent choice when weight reduction and machinability matter most.
When corrosion resistance and durability are the priority, stainless steel is the go-to family of materials. Grade 303 is the easiest stainless to machine and suits fittings, valves, and fasteners. Grade 304 offers a strong balance of corrosion resistance and formability and is widely used in food processing and medical equipment. Grade 316L provides the highest corrosion resistance, particularly against chlorides and chemicals, making it essential for marine, pharmaceutical, and chemical processing applications. For applications that also demand hardness, grades such as 440 are available. Stainless steel machines more slowly than aluminum and costs more, but its performance in harsh environments is unmatched.
Carbon steels such as A36, 1018, 1020, and 1045 deliver excellent strength at a budget-friendly price, making them a practical choice for jigs, fixtures, shafts, and structural parts. When higher strength and toughness are required, alloy steels such as 4140, 4340, 8620, and 9310 provide superior mechanical properties for gears, axles, and heavy-duty components. These materials machine well and can be heat-treated to achieve the hardness your application demands.
Titanium offers an unbeatable combination of high strength, low weight, and outstanding corrosion resistance. Grade 5 titanium (Ti-6Al-4V) is the most commonly machined titanium alloy and is widely used in aerospace, medical implants, and high-performance automotive parts. Titanium is more expensive and harder to machine than aluminum or steel, requiring specialized tooling and slower cutting speeds. However, for applications where performance and weight savings are critical, there is no substitute. ANOK has extensive experience machining difficult materials such as Ti-6Al-4V and Inconel nickel-based alloys.
Brass is one of the easiest metals to machine, producing smooth finishes with minimal tool wear. It is widely used for electrical connectors, plumbing fittings, valves, and decorative hardware. Copper is prized for its excellent thermal and electrical conductivity, making it essential for heat sinks, electrical bus bars, and RF components. Bronze offers good wear resistance and is often used for bearings and bushings. All three machine beautifully and are great choices when conductivity, aesthetics, or low friction are important.
Beyond the common metals, CNC machining can also process more specialized materials. Magnesium is the lightest structural metal and is used in automotive and electronics components where weight savings are critical. Tool steels such as Toolox44 and Toolox33 are engineered for extreme hardness and wear resistance, making them ideal for dies, molds, and cutting tools. Tungsten, one of the hardest and densest metals, is machined for high-temperature and high-wear applications. Each of these materials requires specific tooling and process knowledge, which is why working with an experienced cnc machining metal partner matters.
When selecting a material for your CNC machined parts, consider these key factors: What environment will the part operate in? Does it need to resist corrosion, heat, or chemical exposure? What mechanical loads will the part experience? Is weight a concern? What is your budget and timeline? Harder materials take longer to machine and cost more. A good machine shop will help you balance performance requirements with cost and manufacturability.
ANOK Precision Manufacturing is a custom precision machining factory in ShenZhen, China, serving industries from medical to aerospace to automation. With ISO 9001:2015 certification and more than 50 machining facilities, ANOK delivers precision cnc machining with tight tolerances down to ±0.002 mm and surface finishes down to Ra 0.2. From one-off prototypes to high-volume production, ANOK provides a one-stop metal cnc machining service covering CNC milling, 4-axis and 5-axis machining, CNC turning, surface grinding, WEDM, coating and surface treatment, and high-precision assembly. Whether you need aluminum prototypes, stainless steel production runs, or complex titanium components, ANOK has the equipment and expertise to deliver. Contact ANOK today for a free quote on your next metal CNC machining project.