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Custom CNC Machining Services for Metal & Plastic Parts

3-, 4- and 5-axis CNC milling and turning for custom metal and plastic components, from prototypes to production.

Send your CAD model, drawing, material and quantity. We review critical tolerances, surface finishes and inspection requirements before confirming price and lead time.

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    STEP, STP, IGES, PDF, DWG or DXF; up to 10 MB.

    Your details and files are used to review and respond to your enquiry. Discuss any NDA requirements before sending confidential information.

    Get a Quote in 24 Hours

    Custom CNC Machining for Prototypes and Production

    TOPS Precision (Dongguan Tops Precision Manufacture Co., Ltd.) provides custom CNC machining in Dongguan, Guangdong, China. CNC milling removes material to produce pockets, holes and shaped surfaces; CNC turning is used for rotational features such as shafts and bushings.

    Explore our CNC milling services, CNC turning services and 5-axis machining. Process selection depends on geometry, material, quantity and the approved drawing. Contact our team to review your project.

    How to Order CNC Machining Services

    👉 Our engineering team will support you at every step.

    Send Your Drawing (CAD / PDF / Sample)

    Submit your CAD files, technical drawings, or physical samples, and our experienced engineering team will quickly review your design for manufacturability and optimization suggestions.

    Drawing Review & Quotation

    Send complete drawings and requirements for quotation. We aim to respond within 24 hours; complex parts may need additional engineering review.

    Sample Production & Approval

    Confirm prototype lead time after drawing review. Material availability, geometry, finishing and inspection requirements affect the schedule. Approve samples before production where required.

    Mass Production & Delivery

    With advanced CNC equipment and strict quality control, we ensure consistent high-quality production and on-time global delivery for your orders.

    Discuss Your CNC Machining Lead Time

    Send Your Inquiry Today

      Request a quote

      STEP, STP, IGES, PDF, DWG or DXF; up to 10 MB.

      Your details and files are used to review and respond to your enquiry. Discuss any NDA requirements before sending confidential information.

      Get Online Quote Now

      Our CNC Machining Capabilities

      We offer a full range of custom CNC machining services to meet diverse project requirements.

      CNC milling-2

      CNC Milling Services

      • 3-axis, 4-axis, and 5-axis machining

      • Complex geometries and tight tolerances

      • Ideal for housings, brackets, and enclosures

      complete guide to CNC milling

      Milling Detail
      CNC turning-5

      CNC Turning Services

      • High-speed precision turning

      • Suitable for cylindrical parts

      • Threads, shafts, and bushings

      CNC turning process explained

      Turning Detail

      100+ Materials Available for Selection

      Metals

      how to choose the right material for CNC machining

      Choose the Ideal Option by Understanding Their Unique Properties

      aluminum

      Aluminum

      Lightweight, corrosion-resistant metal known for its excellent strength-to-weight ratio and versatility in manufacturing.
      brass

      Brass

      Corrosion-resistant alloy of copper and zinc, excellent machinability, attractive gold-like appearance, good electrical conductivity.

      Stainless Steel

      Strong corrosion-resistant alloy, durability, sleek appearance, and excellent performance in demanding environments.
      steel

      Steel

      Versatile and durable alloy of iron and carbon, high strength, toughness, and wide range of industrial applications.
      copper

      Copper

      Highly conductive, excellent electrical and thermal performance, as well as its resistance to corrosion.
      cast iron

      Cast Iron

      Excellent abrasion resistance, low cost, ideal for high-load components.
      bronze

      Bronze

      Durable copper alloy with added tin, great wear resistance, low friction, and a rich, antique appearance.
      magnesium

      Magnesium

      Exceptionally lightweight, moderately durable, combustible in ribbon or powder form.
      tool steel

      Tool Steel

      High-strength alloy, withstand high heat and wear, ideal for cutting, molding, and machining tools.
      sheet metal machining

      Sheet Metal

      High strength-to-weight ratios. Easily formable, ideal for cutting, bending, and fabrication in various industries.
      titanium

      Titanium

      Lightweight, high-strength metal, corrosion resistance, used in aerospace, medical, high-performance applications.
      zinc

      Zinc

      Excellent castability, dimensional stability. Ideal for intricate shapes, corrosion resistance

      Send Your Inquiry Today

        Request a quote

        STEP, STP, IGES, PDF, DWG or DXF; up to 10 MB.

        Your details and files are used to review and respond to your enquiry. Discuss any NDA requirements before sending confidential information.

        Get a Quote in 24 Hours

        Plastics

        Understanding Each Material’s Unique Properties Can Greatly Improve Project Success

        delrin（pom）

        Delrin(POM or Acetal)

        Strong, low-friction engineering plastic, excellent dimensional stability and wear resistance.
        ABS

        ABS(Acrylonitrile Butadiene Styrene)

        Tough, impact-resistant plastic commonly used for durable consumer products and electronic housings.
        Acrylic

        Acrylic(PMMA or Polymethyl Methacrylate)

        Transparent plastic, glass-like clarity, weather resistance, and ease of fabrication.

        Nylon(Polyamide)

        Strong, flexible plastic, excellent abrasion resistance and good chemical stability, ideal for mechanical parts.
        peek

        Peek(Polyether Ether Ketone)

        High-performance thermoplastic, strength, chemical resistance, and ability to withstand high temperatures.
        hdpe

        HDPE(High-Density Polyethylene)

        Strong, lightweight, and durable thermoplastic known for its excellent resistance to impact, moisture, and chemicals.
        PTFE

        PTFE(Teflon)

        Non-stick, chemical-resistant plastic, very low coefficient of friction, widely used in sealing and insulation applications.
        garolite machining

        Garolite

        Excellent electrical insulation properties. Strong, lightweight, and resistant to moisture, chemicals, and wear.
        PVC

        PVC(Polyvinyl Chloride)

        Versatile, cost-effective plastic, good chemical resistance and rigidity, commonly used in piping and construction.
        Polycarbonate

        Polycarbonate(PC)

        Good heat resistance and is commonly used in safety equipment, lenses, and enclosures.
        PEI(Ultem)

        PEI(Ultem or Polyetherimide)

        High-strength, heat-resistant plastic, excellent flame and chemical resistance, often used in aerospace, medical.
        UHMW machining

        UHMWPE(Ultra-High Molecular Weight Polyethylene)

        Low friction coefficient and excellent impact strength, making it ideal for high-wear applications.

        Send Your Inquiry Today

          Request a quote

          STEP, STP, IGES, PDF, DWG or DXF; up to 10 MB.

          Your details and files are used to review and respond to your enquiry. Discuss any NDA requirements before sending confidential information.

          Get a Quote in 24 Hours

          Other Materials

          In addition to the above materials, we can also machining the following materials as well.

          PPS,Torlon,Rubber,Mild Steel, FR4, Carbon Fiber,

          Bakelite, Alloy Steel, Foam, Invar, Kovar,

          Polypropylenepp.(PP)

          If in case you want to deal with multiple materials, you can connect with us, TOPS team will assist you with different materials as well. 

          Send Your Inquiry Today

            Request a quote

            STEP, STP, IGES, PDF, DWG or DXF; up to 10 MB.

            Your details and files are used to review and respond to your enquiry. Discuss any NDA requirements before sending confidential information.

            Order a Free Quote Today!

            Industries We Serve

            We machine custom parts for medical equipment, robotics, consumer products, automotive, aerospace, marine, energy, and industrial applications. Share your drawings, material specifications, and inspection requirements so our team can review the machining process for your project.

            Why Machine Delrin
            Tips for Machining Delrin
            medical device
            Machining Delrin
            Delrin For Prototype Manufacturing
            Benefits of Machining Delrin
            Automotive Components
            aerospace parts
            7

             

            If your desired material is not listed above, contact us and order a free quote today!

            Send Your Inquiry Today

              Request a quote

              STEP, STP, IGES, PDF, DWG or DXF; up to 10 MB.

              Your details and files are used to review and respond to your enquiry. Discuss any NDA requirements before sending confidential information.

              Inquire CNC Materials

              CNC Machining Tolerances and Drawing Requirements

              Specify critical dimensions, datums, fits, threads and surface finish on your drawing. Achievable tolerance depends on material, feature size, geometry, workholding and inspection method; a tight tolerance on one feature is not a blanket tolerance for the whole part.

              For dimensions without individual tolerances, state the applicable standard and class on the drawing and confirm them with your quotation. The requirements below are an RFQ checklist, not a guaranteed machine capability chart.

              Read our CNC machining tolerances guide.

              CNC machining RFQ: requirements to confirm before production
              RequirementWhat to specify
              Critical dimensionsNominal size, tolerance, datum references and functional fits.
              Unspecified dimensionsGeneral tolerance standard and class, if applicable.
              Surface finishRoughness, coating type, masking and dimensions measured before or after finishing.
              InspectionCritical features, inspection method, sampling and required reports.
              MaterialExact grade, condition and certificate requirements.

              Send Your Inquiry Today

                Request a quote

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                Your details and files are used to review and respond to your enquiry. Discuss any NDA requirements before sending confidential information.

                Get a Quote in 24 Hours
                before-after

                Surface Finishes Available for CNC Machined Parts

                Enhance the performance and appearance of your parts with our finishing services:

                • Anodizing (Type II / Type III)

                • Electroplating (Nickel, Zinc, Chrome)

                • Powder Coating

                • Sandblasting

                • Polishing

                These processes improve:
                ✔ Corrosion resistance
                ✔ Surface hardness
                ✔ Aesthetic appearance

                surface finishes for CNC machined parts

                Send Your Inquiry Today

                  Request a quote

                  STEP, STP, IGES, PDF, DWG or DXF; up to 10 MB.

                  Your details and files are used to review and respond to your enquiry. Discuss any NDA requirements before sending confidential information.

                  Get a Quote in 24 Hours

                  Why Choose Tops Precision?

                  We are more than just a supplier — we are your manufacturing partner.

                  how CMM inspection works

                  first article inspection (FAI)

                  ✔ Proven Experience

                  10+ years in CNC machining industry

                  ✔ Large Production Capacity

                  Handling both small and large orders

                  ✔ Strict Quality Control

                  Inspection scope and required reports are agreed against the approved drawing before production.

                  ✔ Competitive Pricing

                  Factory-direct cost advantage

                  ✔ Global Customers

                  Serving clients across multiple industries worldwide

                  Send Your Inquiry Today

                    Request a quote

                    STEP, STP, IGES, PDF, DWG or DXF; up to 10 MB.

                    Your details and files are used to review and respond to your enquiry. Discuss any NDA requirements before sending confidential information.

                    Get a Quote in 24 Hours

                    Explore More About Our CNC Machining Applications

                    Mold and Die Manufacturing

                    Mold and Die Manufacturing

                    CNC machining can produce mold inserts, cavities and tooling components. Specify tool material, hardness, surface finish and assembly requirements for review.
                    Custom Prototype Development

                    Custom Prototype Development

                    Machine functional prototypes to evaluate fit and assembly before a production run. Confirm which dimensions and tests must be approved at the sample stage.
                    Aerospace Components Manufacturing

                    Aerospace Components Manufacturing

                    Aerospace-related projects require drawing review and confirmation of material traceability, inspection and any customer-specific qualification requirements before order acceptance.
                    Automotive Parts Making

                    Automotive Parts Making

                    For automotive components, specify the operating conditions, production quantity, critical features and required inspection documentation when requesting a quotation.
                    medical manufacturing

                    Medical Device Manufacturing

                    Medical equipment components require clear material, cleaning and inspection requirements. Any regulated or implant application needs separate qualification and compliance review; general CNC capability does not establish medical approval.
                    Automotive Parts Making

                    Production of Consumer Products

                    Custom housings, brackets and fittings can be machined for consumer products. Select material and finish around function, appearance, quantity and assembly requirements.

                    Send Your Inquiry Today

                      Request a quote

                      STEP, STP, IGES, PDF, DWG or DXF; up to 10 MB.

                      Your details and files are used to review and respond to your enquiry. Discuss any NDA requirements before sending confidential information.

                      Inquire CNC Materials

                      A Comprehensive Overview of CNC Machining

                      If You're New To CNC Machining Services, Here's A Brief Introduction To Help You Get Started

                      How Would You Define CNC Machining?

                      It is a process of cutting the materials using computerized controls. Here, the engineers set the specifications of parts on the computer and the computer-controlled machine starts to cut the material accordingly.  

                      • CNC machining is very accurate due to automation
                      • It is quite fast and also suitable for cutting the cross-sections.
                      • Highly suitable for making parts for cars, medical, or aerospace sectors.

                      How CNC Machining Works?

                      1. Planning: Here, before cutting the material, we first completely analyze the design specifications.
                      2. Set Up the Machine: It must be understood that client instructions must be fed to the machine in a way that enables it to be programmed correctly.
                      3. Machining: The specific function of the tool is to carve and form the metal.
                      4. Check Quality: So, we make sure that every single part of it is as perfect as one can get.

                      Rely on Us for Your CNC Machining Needs

                      Choose the machining process around your part requirements:

                      • Geometry: milling for shaped surfaces and pockets; turning for rotational features.
                      • Material: specify the grade and condition, not only the material family.
                      • Cost: quantity, setups, tool access, tolerances and finishing influence the quotation.
                      • Quality: agree critical dimensions and inspection documentation before production.

                      Send Your Inquiry Today

                        Request a quote

                        STEP, STP, IGES, PDF, DWG or DXF; up to 10 MB.

                        Your details and files are used to review and respond to your enquiry. Discuss any NDA requirements before sending confidential information.

                        Inquire CNC Materials

                        CNC Machining Parts Made By Tops Precision

                        At Tops Precision, we specialize in rapid, cost-effective prototyping and low-volume production for a wide range of industries and applications, including functional prototypes and production parts for automotive, aerospace, electrical appliances, household appliances, and consumer electronics. Our high-precision CNC machining services transform digital designs into practical, market-ready physical products with accuracy and efficiency.

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                        Frequently Asked Questions

                        TOPS Precision provides CNC milling and turning for custom metal and plastic components, with 3-, 4- and 5-axis machining options. The process is selected after reviewing part geometry and drawing requirements.

                        Send a 3D CAD file such as STEP or IGES and a dimensioned 2D drawing where available. Include material grade, quantity, critical tolerances, threads, finish, inspection documents, delivery destination and required date.

                        Tolerance feasibility is reviewed by feature, material, size and geometry. State critical dimensions and datums on the drawing, and agree general tolerances for unspecified dimensions before production.

                        Lead time is confirmed after drawing review. Material availability, number of setups, quantity, finishing and inspection affect the schedule. Tell us your required date when requesting a quote.

                        This page lists metal and engineering plastic options, including aluminum, steel, stainless steel, brass, POM, nylon and PEEK. Specify the exact grade and condition so material availability and suitability can be reviewed.

                        FAI and dimensional reports can be discussed on request. Include the required inspection scope, material certificates and any compliance documents in the RFQ so deliverables are confirmed before production.

                        Anodizing, plating and other coatings can affect dimensions and fits. Specify coating requirements, masking and whether critical dimensions apply before or after finishing.

                        We support prototype and production enquiries. Send the quantity per part and expected repeat demand; minimum order and pricing depend on material, setup and project requirements.

                        Let's Start A New Project Today

                        Send Your Inquiry Today

                          Request a quote

                          STEP, STP, IGES, PDF, DWG or DXF; up to 10 MB.

                          Your details and files are used to review and respond to your enquiry. Discuss any NDA requirements before sending confidential information.

                          Get Instant Quote
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