Metal material guide

Copper CNC
Machining

Machined contacts, conductive fittings and thermal components, with copper grade, condition and interface requirements matched to the drawing.

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Copper-labelled machined fitting pair with rounded ends — Copper-labelled library photograph. It illustrates geometry; the grade and condition are specified per order.

Specify: C11000 ETP copper or named alternative
Review: Contact face and Burr-sensitive port
Confirm: Final condition and acceptance records

Start with the electrical or thermal path.

A copper part performs through its section and its interfaces. Specify the required conductivity, working temperature, contact surfaces and mechanical loads before choosing the alloy and temper.

Electrical contacts

Identify the current path, mating pressure and contact finish. Separate a bulk material requirement from assembled contact-resistance acceptance.

Thermal interfaces

Mark mounting and contact faces, flatness and any surface layer. Thermal performance depends on the assembled path, not only on the copper name.

Conductive fittings

Define bores, thin sections, threads and any joining process. Review the balance between conductivity and machining response.

Choose the grade and stock together.

Compare the Copper options below against the drawing and service conditions. Specify the complete supplier grade, condition and stock form; material examples do not establish current inventory or permit substitutions.

Copper selection guide
Grade or stock	Why consider it	What to resolve
C11000 ETP copper	A common high-conductivity copper family.	Specify condition and product form, plus electrical and joining requirements.
C10100 / C10200	Oxygen-free copper specifications when called for by the design.	Retain the exact designation and purchasing standard; these are not merely colour variants.
C14500 tellurium copper	A candidate when machining detailed conductive components.	Check the required conductivity and approved material substitution.
Specified copper-alloy stock	A drawing using a named strengthened or specialty copper.	Review the complete alloy and condition instead of grouping it with pure copper.

Selection examples are subject to material and drawing review. They are not an inventory list.

Already have a grade on the drawing?

Add it to your quotation checklist ↓

Protect the contact surfaces while controlling the cut.

Copper features can be sensitive to burrs, local deformation and handling damage. Mark the functional surfaces and inspection datums so they remain the focus of the route.

Copper drawing guide: Contact face, Burr-sensitive port, Finished datum. Schematic geometry only; no numerical capability is implied.

Burrs at holes and slots

Identify cross holes, narrow slots and edges near the contact path. Agree the deburring requirement and any restricted edge break.

Clamping and thin walls

Show unsupported sections and the condition in which size is accepted. Avoid assuming the appearance of a rigid metal means every feature is resistant to clamping damage.

Face condition and handling

Specify contact-face flatness, roughness and protection. Keep any plating allowance and post-finish dimensions inside the drawing review.

Mark critical dimensions on the drawing. Achievable tolerances, wall thickness, part size and delivery are confirmed for the geometry, material, finish and quantity in the quotation.

Specify the surface at the contact.

Bare copper

Define the acceptable surface state, cleanliness and protection before assembly. State whether oxidation or handling marks affect acceptance.

Plated contact surfaces

Specify the layer system, thickness, adhesion and protected areas. The final interface requirement should govern the finish selection.

Machined thermal faces

Define flatness, roughness, mating pressure assumptions and any required cleaning. A cosmetic polish alone is not a thermal-interface specification.

Review surface finishing options ↗

Check material and interface requirements separately.

Grade and condition

Request the copper designation, temper or condition and traceability. A copper-coloured surface is not an identity test.

Dimensional inspection

Identify bore positions, contact-face geometry and any final plated fits.

Electrical or thermal tests

State the measured parameter, test arrangement and acceptance limits if these are part of the order. Do not infer assembly performance from a material certificate alone.

Material → Part → Application

Three different checks.

The material record identifies the purchased stock. The inspection report checks the drawing. Application validation checks the part in service.

Review inspection requirements ↗

Copper machining questions.

Answers to the decisions that affect the material, drawing and finished part.

Are C11000 and oxygen-free copper interchangeable?

Not automatically. Check the drawing standard, required conductivity, joining environment and application documents before approving a change.

Why consider tellurium copper?

It can be compared when detailed machining is important, but the complete electrical and mechanical requirement must still be met by the selected grade.

Does a polished copper face guarantee low contact resistance?

No. Contact resistance also depends on the assembled interface, force, surface state and test method. Define the actual acceptance requirement.

Should copper parts be plated?

The electrical, corrosion, joining and handling requirements determine the route. Include the required finish with the RFQ rather than choosing it after machining.

How are delicate copper edges protected?

Identify the sensitive edges and contact surfaces, then agree deburring, handling and packaging requirements. Specify permitted edge breaks on the drawing.

What should a copper RFQ include?

Provide the exact grade and condition, drawing, quantity, conductivity requirement, contact faces, finish and any functional testing or traceability.

Prepare your enquiry

Connect the copper grade to the interface requirement.

Send the CAD model and dimensioned drawing with quantities, service conditions and the requirements below. If the grade is undecided, describe the function and the constraints.