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When standard copper sheet simply isn't strong enough, makers, machinists, and small-workshop engineers turn to Copper Beryllium Alloy C17200 for its exceptional combination of conductivity, spring-like elasticity, and fatigue resistance. Whether you're fabricating electrical contacts, precision springs, or custom tooling components, finding a reliable source of accurately dimensioned C17200 stock in small quantities can be a real challenge — this listing solves that.
Each piece is cut from C17200 beryllium copper alloy, available in three temper states: semi-hardened sheet, semi-hardened strip, and fully hardened sheet. Sheet sizes range from 100mm × 200mm to 200mm × 300mm (approximately 3.9″ × 7.9″ to 7.9″ × 11.8″), with strip widths of 5mm and 10mm (approximately 0.2″ and 0.4″) sold by the meter. Thickness options span 0.1mm to 3.0mm (approximately 0.004″ to 0.118″), giving you precise control over material stiffness and cross-section.
Typical use cases include fabricating electrical contact springs and relay blades where both conductivity and spring-back are critical, machining precision shims and spacers for aerospace or instrumentation assemblies, and crafting custom beryllium copper strip for connector housings, switch components, or prototype tooling inserts that require non-sparking properties.
| Material | Copper Beryllium Alloy C17200 (CuBe2) |
|---|---|
| Beryllium Content | Approximately 1.8–2.0% |
| Temper / Condition | Semi-hardened (Sheet & Strip) / Fully hardened (Sheet) |
| Thickness Range | 0.1mm – 3.0mm (0.004″ – 0.118″) |
| Sheet Sizes | 100×200mm / 200×200mm / 200×300mm |
| Strip Widths | 5mm / 10mm (sold per 1-meter length) |
| Tensile Strength (fully hardened) | Typically 1,100–1,400 MPa |
| Electrical Conductivity | Approximately 22% IACS |
| Elastic Modulus | Approximately 128 GPa |
| Density | Approximately 8.25 g/cm³ |
| Hardness (fully hardened) | Typically 36–42 HRC |
| Surface Finish | See variant options |
| Quantity per Order | 1 Piece or 1 Meter (see variant options) |
| Product Type | Copper Sheet / Strip |
Semi-hardened (also called "half-hard" or AT condition) C17200 retains some formability, making it easier to bend, stamp, or shape before a final aging heat treatment that brings it to full hardness. Fully hardened sheet has already been age-hardened to peak strength (typically 1,100–1,400 MPa tensile) and is ready for direct use in applications requiring maximum spring force or wear resistance, but it is more difficult to form without cracking.
C17200 in the fully hardened condition achieves tensile strengths of approximately 1,100–1,400 MPa, which is roughly 3–5× stronger than standard copper (around 200–250 MPa) and significantly stronger than most brass alloys (typically 300–600 MPa). This makes it one of the strongest copper-based alloys available, while still retaining useful electrical conductivity.
Yes. C17200 exhibits good corrosion resistance in most industrial atmospheres, fresh water, and mild chemical environments. It performs well in applications exposed to humidity, oils, and non-oxidizing acids. For highly aggressive chemical environments (strong oxidizing acids, ammonia-based compounds), additional protective coatings or a different alloy may be more appropriate. Contact us to confirm suitability for your specific environment.
For light-duty spring contacts and relay blades, thicknesses in the 0.1mm–0.3mm range are most common, providing the necessary flex without excessive spring force. For heavier-duty connectors or switch springs requiring more restoring force, 0.3mm–0.6mm is typical. For structural spring elements or tooling inserts, 0.8mm–3.0mm may be appropriate. If you are unsure, we recommend starting with a semi-hardened variant so you can test formability before committing to a final design.
C17200 can be cut with standard metalworking equipment including shears, band saws, CNC mills, EDM wire cutting, and laser cutters. However, because beryllium copper work-hardens during machining, carbide tooling is strongly recommended for milling and drilling, especially on thicker gauges (0.5mm and above). Always follow appropriate safety guidelines when machining beryllium-containing alloys, including adequate ventilation and dust control.
For EMI shielding foil or gasket stock, the 0.1mm–0.2mm semi-hardened sheet in 200×200mm or 200×300mm sizes is the most versatile starting point, offering a balance of thin cross-section for conformability and enough structural integrity to handle during fabrication. Strip variants (5mm or 10mm wide) are well-suited for finger-stock EMI gaskets that need to be cut to length. Select fully hardened if the gasket must maintain consistent contact force over many compression cycles.
Strip variants (Width 5mm and Width 10mm) are sold in 1-meter lengths per piece. To order multiple meters, simply increase the quantity at checkout — each unit equals 1 meter of continuous strip. Sheet variants are sold per individual piece at the stated dimensions. If you need larger quantities or custom lengths, please contact us to discuss bulk pricing.
