Copper CNC Machining Services

Custom copper prototypes and production parts for electrical and thermal applications, machined to your drawing.

6CProto offers CNC milling and turning for copper parts, with deburring, surface finishing, and dimensional inspection planned around the features that matter. Compare C11000, C10100, and C10200 below, then send your CAD model, drawing, quantity, and material requirements for an engineering review.

Copper conducts heat and electricity well, but its ductility calls for careful tool selection, workholding, edge control, and inspection. We review the route against your part geometry.

Formed copper part shown in 6CProto's own manufacturing gallery

From prototype to repeat orders

3-, 5-axis CNC milling  

Tolerance: ±0.01 mm

ISO 9001:2015 certified

*Selected features may reach ±0.01 mm after drawing review. Achievability depends on geometry, copper grade and temper, stock form, finish, and inspection method.

Choose the exact copper grade

C11000, C10100 and C10200 Copper for Your RFQ

6CProto lists these three unalloyed copper grades in its CNC material range. Their key difference is the specified oxygen and purity level, not a promise that one grade will suit every electrical, vacuum, or joining requirement. State the exact UNS grade, stock form, temper, governing standard, and certificate needs.

Copper grade Common reason to consider it Specify or verify
C11000 ETP  Conductive busbars, terminals, heat spreaders, and general copper hardware. Electrolytic tough pitch copper; confirm form, temper, joining process, and the required certificate.
C10100 OFE  High-purity, low-oxygen electronic or vacuum-related designs when the specification calls for OFE. Oxygen-free electronic grade; confirm purity, oxygen limit, approved standard, and certified stock.
C10200 OF  Oxygen-free conductive components when C10100’s tighter impurity limits are not required. Oxygen-free grade; confirm the drawing’s conductivity, form, temper, and joining requirements.

 

C11000 ETP Copper

A practical starting point for conductive machined parts. The Copper Development Association identifies C11000 as electrolytic tough pitch (ETP) copper with at least 99.90% copper and at least 100% IACS conductivity in the annealed condition.

Applications

Busbar features, electrical terminals, current-carrying blocks, and heat spreaders where the approved design permits ETP copper.

Important decision

Ask about any high-temperature joining or hydrogen-bearing process. Oxygen-free copper may be needed for certain process environments; the drawing must determine the grade.

RFQ: specify C11000, product form, temper, coating or exposed contact zones, and electrical test requirements.

C10100 OFE Copper

Oxygen-free electronic copper with tighter purity and oxygen limits. CDA lists at least 99.99% copper, a maximum of 0.0005% oxygen, and a minimum of 101% IACS conductivity in the annealed condition.

Applications

Electronic, vacuum-related, and other high-purity components when the engineering specification explicitly requires OFE material.

Important decision

Its higher purity should be justified by the application and verified with the relevant stock certificate. Do not replace C10100 with a generic “oxygen-free copper” label.

RFQ: send the UNS designation, governing standard, form, temper, impurity or gas limits, and traceability needs.

C10200 OF Copper

Oxygen-free (OF) copper. CDA lists at least 99.95% copper, a maximum of 0.0010% oxygen, and a minimum of 100% IACS conductivity in the annealed condition.

Applications

Conductive parts requiring an oxygen-free grade without automatically specifying the tighter purity limit of C10100.

Important decision

Check the approved drawing, stock availability, joining method, and the certificate before choosing it over C11000 or C10100.

RFQ: state C10200, form and temper, inspection criteria, and whether coating or brazing is planned.

Unsure which grade to choose? Send the drawing and explain the current, heat load, environment, joining process, and any purity or vacuum requirement. We can review the material callout and machining route before quotation.

These descriptions are selection guides, not certified design values. Conductivity figures above refer to the annealed condition in Copper Development Association data for C11000, C10100, and C10200. Final acceptance follows the ordered standard, form, temper, thickness, and mill certificate; material substitutions need design approval.

Match the grade to the requirement

Which Copper Grade Should You Specify?

Start with the requirement that drives the design. The grade names are not interchangeable purchase descriptions, and their conductivity alone does not decide how a finished assembly performs.

Primary requirement Starting point Why it fits What to confirm
General high-conductivity hardware C11000 ETP Widely specified conductive copper grade. Temper, geometry, contact finish, current and temperature rise.
Oxygen-free copper requirement C10200 OF Controlled oxygen level without assuming the tighter OFE impurity limits. Approved specification, joining or vacuum conditions, certificate.
Electronic-grade purity C10100 OFE Tighter copper purity and oxygen limits when required by the design. Exact impurity limits, traceability, stock form, and cost.
Fast free-cutting hardware Review a brass or other copper alloy Unalloyed copper is ductile and needs more burr and chip-control planning. Whether the lower conductivity of an alternative is acceptable.

 

A busbar also depends on cross-section, joint design, contact resistance, and cooling. Specify electrical performance and how the completed part will be tested where those factors matter.

 

Make the drawing machinable

Copper CNC Milling and Turning Capabilities

Copper can smear, form built-up edges, and leave burrs when the cutting plan is wrong. We review the material condition, tool access, fixturing, edge quality, and inspection plan before confirming the process.

CNC Milling

For busbar pockets, mounting faces, slots, heat spreader features, and multi-face details. 3-, 4-, and 5-axis approaches are chosen for access and setup control.

Explore CNC milling

CNC Turning

For round conductors, contacts, collars, and custom cylindrical hardware. Stock form, thin-wall rigidity, and burr-sensitive holes influence the turning plan.

Explore CNC turning

Secondary Work

Drilling, tapping, deburring, brushing, polishing, and specified plating can be coordinated with machining. Define whether critical sizes apply before or after finishing.

Explore surface finishing

What we review before quoting

Grade and temper, available stock form, flatness, thin sections, deep holes, thread engagement, contact faces, burr limits, coating thickness, cleaning, and how each critical feature will be measured.

Common copper part families

  • Busbars and conductive terminals
  • Heat spreaders and thermal interface plates
  • Power distribution blocks and electrical contacts
  • Custom electrodes and precision copper hardware

Protect the function of each surface

Finishing Options for Machined Copper Parts

6CProto lists as-machined, nickel-plated, brushed, and mirror-polished copper finishes. Choose by the part’s electrical contact, appearance, joining, and dimensional requirements.

As Machined and Deburred

Keep the natural copper surface where it suits the application. Mark burr-sensitive edges, contact faces, hole exits, and the required cleaning condition.

Brushed or Polished

Use brushing or polishing for a controlled appearance or interface texture. Identify cosmetic faces and any sealing or contact areas whose geometry must remain intact.

Nickel Plating

Nickel can provide a specified surface barrier. Define the coating standard, thickness, masked areas, contact performance, and dimensions after plating.

Application-Specific Contact Coatings

If your design needs tin, silver, or another conductive contact coating, send the exact specification. Availability, adhesion, selective coverage, and finished dimensions are reviewed for the project.

Avoid an unspecified “protective finish” on an electrical contact. Coatings and oxidation can affect contact resistance, solderability, appearance, and measurement. Confirm the finish stack in the RFQ.

Drawing-led quality control

How We Review Copper Parts for Manufacture

6CProto is ISO 9001:2015 certified. Your drawing sets the acceptance criteria: grade, temper, critical features, surface condition, and any requested certificate or report.

During quoting, we review what needs machining and what needs preserving: electrical contact areas, flatness, threads, small holes, edges, and cosmetic faces. Inspection can be planned around datums and the part’s functional surfaces. Material certificates and dimensional reports should be requested when they are part of acceptance.

Our typical CNC tolerance statement is ±0.02 mm; selected features may reach ±0.01 mm after review. Copper grade, temper, size, geometry, clamping, finishing, and measurement method determine what can be quoted for your specific part.

Include in your RFQ

  • STEP or other 3D CAD file and controlled 2D drawing
  • UNS grade, standard, stock form, and temper
  • Current, heat load, purity, vacuum, or joining requirements
  • Critical dimensions, flatness, threads, datums, and burr limits
  • Coating standard, thickness, masking, and contact faces
  • Quantity, target schedule, certificate, and report needs

Electrical and thermal applications

Design the Copper Part Around Its Connection

A conductive part’s performance depends on the whole path through the assembly. 6CProto’s published engineering guide discusses material choice, cross-section, contact surfaces, plating, and joint design for copper and brass electrical parts.

Copper wire illustrating electrical conductivity on 6CProto's CNC materials page

Busbar or terminal: Size the conductor for the specified current and temperature rise, then identify contact faces, bolt holes, and edge burr limits on the drawing.

Heat spreader: Specify the interface flatness, finish, mating surfaces, and thermal assembly conditions. Copper’s high conductivity cannot compensate for a poorly defined interface.

Manufacturing choice: Some copper parts are better cut and formed from sheet, with selective CNC features added. We review the route against geometry, quantity, and tolerance.

Before the drawing is released

Three Design Tips for Copper CNC Parts

Define Contact Surfaces

Identify mating faces, desired roughness, coating or no-coating zones, and inspection conditions. State the electrical test when resistance matters more than appearance.

Call Out Burr-Sensitive Features

Mark the hole exits, cross holes, threads, and edges that touch insulation or electrical contacts. Copper’s ductility makes edge and chip control a real planning item.

Specify Stock Condition

Use the full UNS grade, form, temper, and material standard. Temper changes strength and forming behavior; oxygen-free and OFE are distinct purchasing callouts.

FAQs

Which copper grade is best for CNC machining?

Start with the part’s electrical, thermal, purity, and joining requirements. C11000 ETP is a common starting point for conductive hardware; C10200 is oxygen-free; C10100 has tighter OFE purity limits. All three need suitable tooling and burr control. Specify the exact approved grade rather than choosing by machinability alone.

C11000 is electrolytic tough pitch copper. C10200 is oxygen-free copper, and C10100 is oxygen-free electronic copper with tighter copper purity and oxygen limits. CDA lists at least 100% IACS conductivity for annealed C11000 and C10200, and at least 101% IACS for annealed C10100. Use the governing specification and mill certificate for acceptance.

No. C10100 is useful when its tighter OFE impurity limits are actually required. For other designs, C11000 or C10200 may meet the approved specification. Compare the complete requirement, certificate, available stock, and quote before deciding.

Yes, these are suitable part types for a drawing review. The route may combine cutting, forming, or CNC milling depending on geometry. Provide current or heat-load requirements, material and temper, contact faces, flatness, hole and edge requirements, finish, and quantity.

Unalloyed copper is ductile and can produce long chips, built-up edge, or burrs if the tooling and parameters are unsuitable. We plan cutting, fixturing, deburring, and inspection around the specified grade and part features.

6CProto states a typical CNC capability of ±0.02 mm, with selected features potentially reaching ±0.01 mm after drawing review. The actual quotation depends on copper grade and temper, geometry, size, finish, and measurement method; no single tolerance applies to every feature.

Yes. 6CProto lists nickel plating, brushing, and mirror polishing among copper finish options. Tell us which faces are electrical contacts, which areas need masking, the coating standard and thickness, and whether the final dimensions apply after finishing.

Send a 3D CAD file and controlled 2D drawing, exact UNS copper grade, stock form and temper, quantities, critical dimensions, burr limits, finish, and any material certificate or inspection report requirements. Explain the electrical, thermal, vacuum, or joining conditions that drive grade selection.

Ready to discuss your copper part?

Send Your Copper Drawing for an Engineering Review

Tell us what the part must carry, dissipate, connect, or fit. We will review the grade, machining route, finish, burr requirements, and inspection scope before quoting.

Include a STEP file and 2D drawing when available. You can request an NDA for confidential project files.

Copper C101 — Material overview

C101 copper, also known as HC copper (High Conductivity Copper) or more precisely, high-conductivity copper, has a nominal electrical conductivity of 100% IACS (International Annealed Copper Standard)—a benchmark level for conductive performance. It also features excellent high thermal conductivity, making it the preferred material for various electrical components (such as terminals) and conductors (such as power transmission busbars).
Furthermore, this material possesses high ductility (enabling easy complex forming processes like stretching and bending) and reliable impact resistance. While meeting the requirements for electrical performance, it can also accommodate the structural stability demands of mechanical processing and practical operating conditions, making it truly a high-quality copper material that combines multi-functional properties with practical value.