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When your project demands a thin, conductive metal that holds its shape under repeated stress, standard copper sheet falls short. Engineers, machinists, and precision fabricators working on spring contacts, shim stock, and RF shielding need a material that combines electrical conductivity with fatigue resistance — that's exactly where C17200 beryllium copper sheet delivers.
These BeCu foil panels are cut from C17200 alloy (also known as Alloy 25), the most widely used beryllium copper grade. Available in two sheet sizes — 200mm × 200mm (~7.87" × 7.87") and 215mm × 200mm (~8.46" × 7.87") — with thickness options ranging from 0.08mm to 1.2mm (approximately 0.003" to 0.047"). The surface finish is smooth-rolled, and the alloy composition is nominally 98% copper with ~1.8–2.0% beryllium.
Typical applications include precision spring fabrication for electronic connectors, shim stock for tight-tolerance mechanical assemblies, EMI/RF shielding panels in enclosures, and thin diaphragm blanks for sensors and transducers. Long-tail use cases: beryllium copper shim sheet for CNC machining, BeCu foil for electrical contact stamping, thin copper alloy strip for spring manufacturing.
| Alloy Designation | C17200 (Alloy 25 / CuBe2) |
|---|---|
| Beryllium Content | 1.8–2.0% |
| Copper Content | ~98% (balance) |
| Sheet Size Options | 200mm × 200mm / 215mm × 200mm |
| Thickness Range | 0.08mm – 1.2mm (0.003" – 0.047") |
| Surface Finish | Smooth cold-rolled |
| Electrical Conductivity | Typically 22–28% IACS |
| Temper / Condition | See variant options |
| Tensile Strength | See variant options |
| Hardness | See variant options |
| Quantity per Order | 1 piece (per variant selected) |
| Product Type | Copper Sheet / Metal Foil Strip |
For light-duty spring contacts and finger springs in connectors, 0.08mm–0.15mm is typical. For heavier-duty leaf springs or cantilever contacts requiring more force, 0.2mm–0.5mm is more common. If you need a specific spring rate, calculate the required thickness based on your deflection and load requirements before ordering.
C17200 BeCu in the age-hardened condition achieves tensile strengths of approximately 1,100–1,400 MPa — roughly 4–6× stronger than pure copper sheet. This makes it suitable for high-cycle fatigue applications like spring contacts and diaphragms where standard copper would deform permanently.
Yes. C17200 BeCu offers good resistance to atmospheric corrosion, seawater, and many industrial chemicals. It performs well in humid environments and resists stress corrosion cracking better than many other high-strength copper alloys. For highly aggressive chemical environments, confirm compatibility with your specific media before use.
In the annealed (soft) condition, C17200 sheet can be sheared, punched, laser cut, EDM wire cut, and CNC milled using standard tooling. Thinner foils (0.08mm–0.3mm) can be cut with sharp metal shears or a craft knife on a hard surface. Note: always follow appropriate safety precautions when machining beryllium copper — use wet cutting methods and proper respiratory protection to avoid beryllium dust exposure.
Two sheet sizes are available: 200mm × 200mm (~7.87" × 7.87") and 215mm × 200mm (~8.46" × 7.87"). These are suitable for most prototype parts, shim blanks, and small panel cuts. If your part requires a larger blank, you may need to tile multiple sheets or contact us to discuss custom sizing options.
C17200 BeCu is used in EMI shielding applications, particularly where the shield also needs to function as a spring contact (e.g., finger stock gaskets, board-level shields with spring retention). Its combination of conductivity and spring-back makes it effective for shielding enclosures that require repeated opening and closing. For purely passive shielding without mechanical function, standard copper sheet may be more cost-effective.
Choose the 200mm × 200mm sheet for square blanks and parts that fit within a 200mm envelope. Select the 215mm × 200mm sheet when your part layout requires a slightly wider blank — for example, a rectangular spring or shim that is longer than 200mm in one direction. Check your part drawing dimensions before selecting.
