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Engineers, makers, and precision fabricators who need a copper alloy that holds its shape under repeated stress know the frustration of standard copper bending out of tolerance or corroding at contact points. C17200 beryllium copper sheet solves that problem — delivering the electrical conductivity of copper with spring-grade mechanical strength, making it the go-to flat stock for demanding DIY and industrial builds.
Each piece is cut from C17200 (UNS C17200) beryllium copper alloy, also known as BeCu or Alloy 25. Thickness ranges from 0.1 mm (≈0.004 in) up to 12 mm (≈0.472 in), with sheet widths of 200–225 mm (≈7.87–8.86 in) and lengths of 200 mm, 500 mm, or 1000 mm depending on the selected variant. The surface is mill-finished with a characteristic golden-bronze tone.
Typical use cases include electrical contact springs and relay blades where low resistance and fatigue life matter, precision shim stock and feeler gauge blanks for tight-tolerance assemblies, and RF/EMI shielding foil for electronics enclosures — all long-tail applications where beryllium copper thin foil plate outperforms standard brass or phosphor bronze.
C17200 alloy achieves tensile strength of typically 1,100–1,400 MPa in the aged condition — far exceeding standard copper, making it ideal for contact springs and snap-fit components.
Maintains approximately 22–28% IACS conductivity, balancing current-carrying capacity with mechanical performance for relay contacts and bus bar shims.
Naturally resistant to atmospheric corrosion, seawater, and many industrial chemicals — extending service life in harsh environments without surface coatings.
Available from ultra-thin 0.1 mm foil up to 12 mm plate, covering shim stock, spring strip, and structural flat bar needs in a single product listing.
Can be sheared, punched, bent, and CNC-milled in the annealed state before age-hardening — allowing complex part geometries without cracking.
Inherently non-sparking and non-magnetic properties make BeCu sheet suitable for use in explosive atmospheres and MRI-adjacent environments.
| Alloy Designation | C17200 (UNS C17200 / Alloy 25) |
|---|---|
| Material | Beryllium Copper (BeCu) |
| Beryllium Content | Typically 1.8–2.0% |
| Thickness Range | 0.1 mm – 12 mm (0.004 in – 0.472 in) |
| Width | 200 mm – 225 mm (7.87 in – 8.86 in) |
| Length Options | 200 mm / 500 mm / 1000 mm |
| Surface Finish | Mill finish (golden-bronze tone) |
| Temper / Condition | See variant options |
| Tensile Strength (aged) | Typically 1,100–1,400 MPa |
| Electrical Conductivity | Approx. 22–28% IACS |
| Hardness | See variant options |
| Quantity per Order | 1 Pcs |
For electrical contact springs and relay blades, thicknesses of 0.1–0.5 mm are most common. For shim stock and precision spacers, 0.1–1.0 mm works well. For structural flat bar or tooling inserts, select 2 mm and above. If you are unsure, select your size above to compare dimensions, or contact us to confirm suitability.
Yes. In the age-hardened condition, C17200 BeCu achieves tensile strengths of 1,100–1,400 MPa — roughly 3–5× stronger than standard copper and significantly stronger than most brass alloys. This makes it the preferred choice for spring contacts and fatigue-critical components.
Beryllium copper does not rust (it contains no iron). It forms a thin, stable oxide layer that protects the surface from further atmospheric corrosion. It also resists seawater and many industrial chemicals, making it suitable for marine and outdoor electrical enclosure applications.
Yes, in the annealed (soft) condition, C17200 BeCu can be sheared, punched, CNC-milled, and bent using standard metalworking equipment. For best results, machine before age-hardening. Note: beryllium dust and fumes are hazardous — always follow appropriate safety precautions (wet cutting, respiratory protection) when machining.
Yes. C17200 beryllium copper is compatible with silver soldering and copper brazing processes. Standard tin-lead or lead-free solder can also be used for electrical connections. Avoid flux residues that contain ammonia compounds, as these can cause stress corrosion cracking.
The length dimension refers to the longest side of the flat sheet. The 200 mm × 200 mm size is ideal for small prototype parts and contact blanks. The 500 mm length suits medium-run shim stock and strip cutting. The 1000 mm length is best for continuous strip applications or when you need to cut multiple parts from a single piece to reduce waste.
Yes. C17200 BeCu is inherently non-magnetic and non-sparking, which makes it suitable for use near sensitive electronic equipment, in MRI-adjacent environments, and in potentially explosive atmospheres such as mining, oil & gas, and chemical processing facilities.
