CuCr Custom Component

CuCr custom component is the catch-all listing for copper-chromium parts that don't fit the standard disc, AMF, or RMF contact forms. If you have a drawing for a CuCr part with a unique geometry, a proprietary contact shape, a contact-on-stem assembly, a specialty vacuum interrupter component, or any application requiring CuCr in a non-standard form. This is the right starting point.

Most CuCr work is made to drawing. The standard SKUs in this category exist because certain forms repeat across customers; the custom component listing is where everything else lives. For the standard grades and geometries, see CuCr25, CuCr50, and CuCr Contact Disc.

Specifications

Property	Value
Material Grade	CuCr25 / CuCr50 per GB/T 26867-2011
Chromium Content	23–27 wt% (CuCr25) / 47–52 wt% (CuCr50)
Form	Per drawing
Achievable Tolerance	Standard machining tolerance; tight tolerance on request
Features Supported	Slots, coils, recesses, stepped faces, stem interfaces
Assemblies	CuCr contact + copper / copper-alloy stem per drawing
Surface Treatment	As machined; contact face finish per drawing
Material Certification	Per lot on request

Exact certified properties for your lot are available with material documentation on request.

Applications

• Custom CuCr geometries for vacuum interrupter OEMs with proprietary contact designs
• Contact-on-stem assemblies (CuCr contact brazed to a copper or copper-alloy conductive stem)
• Specialty CuCr components for non-standard vacuum switching applications
• Replacement parts where only the drawing or a physical sample exists
• One-off CuCr parts for prototypes and engineering samples

Technical Notes

CuCr machining behaves like a copper-chromium composite. The chromium phase makes it more abrasive on tooling than pure copper, so feed rates and depth of cut are conservative and tool wear is higher. CuCr50 (50% chromium) is harder on tooling than CuCr25. For complex geometries with tight tolerances, we offer a design-for-manufacturability review before tooling.

For contact-on-stem assemblies, the braze joint between the CuCr contact and the copper or copper-alloy stem is the critical design point, joint geometry, filler choice, and furnace cycle govern joint strength and the electrical resistance at the interface. We braze in our supply network under controlled atmosphere with silver-based fillers.

For vacuum interrupter parts specifically, low dissolved gas content is processed in regardless of geometry. The part sits inside a sealed vacuum bottle, so gas content matters for any CuCr component in VI service, not just the standard discs.

Sourcing & OEM

Send drawings in DXF / PDF / STEP format with target quantity, CuCr grade, and assembly details (if contact-on-stem). We'll confirm feasibility, flag any geometry tweaks, and quote.