UNS C17200 Beryllium Copper Strip (CuBe2 / CDA 172) for Connectors, Springs & EMI Shielding

When a connector needs reliable contact force, a spring needs excellent fatigue resistance, or an EMI shielding component must maintain stable electrical contact under repeated cycling, ordinary copper alloys may not provide the right balance of strength, conductivity and spring performance.

That is where UNS C17200 Beryllium Copper Strip (CuBe2 / CDA 172) stands out.

With its combination of high strength, excellent spring properties, electrical conductivity, fatigue resistance, corrosion resistance and resistance to stress relaxation, C17200 Beryllium Copper Strip is widely selected for demanding connector, spring, electronic contact and EMI shielding applications.

If your purchasing requirement is more than simply "copper strip," the right material condition, thickness tolerance, surface quality and mechanical properties can directly affect the performance and service life of your final component.

We supply UNS C17200 Beryllium Copper Strip in customized sizes, tempers and surface conditions for OEM and industrial applications, helping buyers obtain the material they need without unnecessary processing or long lead times.

The exact specifications of UNS C17200 Beryllium Copper Strip can be customized according to the customer's application and manufacturing requirements.

For exact thickness, width tolerance, temper and mechanical property requirements, please contact us with your technical specification.

• For Connectors: The unique value of C17200 lies in its "contact force retention." Traditional phosphor bronze or brass connectors gradually lose contact force after repeated mating cycles, leading to increased contact resistance and signal degradation. C17200 exhibits excellent stress relaxation resistance below 200°C, ensuring connectors maintain stable contact pressure throughout their entire service life.

• For Springs: When a spring design requires maximum force output within limited space, C17200 is almost the only choice. Its yield strength can reach 1,210 MPa (age-hardened), while its elastic modulus is only 131 GPa - meaning greater elastic deflection can be achieved at the same stress level. This is why precision spring, diaphragm, and bellows manufacturers specify C17200 as their standard material.

• For EMI Shielding: C17200 beryllium copper finger stock is widely used in broadcasting, telecommunications, and aerospace for contact and shielding at radio and microwave frequencies. Its conductivity (17-28% IACS) provides a low-impedance grounding path, while its high strength ensures shielding fingers return to their original position after repeated compression.

We provide full custom processing service for UNS C17200 beryllium copper strip: coil slitting, cutting to length, surface cleaning, special packaging.

Sample supply: Small test strips available for your stamping and performance validation.

• Custom temper: Supply soft annealed strip for stamping followed by customer aging, or pre-aged TH04 ready-to-stock strip.
• Fast turnaround: For standard sizes in stock, we can finish slitting within 3–7 working days. Custom non-standard dimensions will be confirmed on lead time during quotation.
• Technical support: Our metallurgy team can assist in temper selection for your connector, spring or EMI shielding design.

Before confirming UNS C17200 beryllium copper strip for connectors, springs or EMI shielding, verify these points:

• Working temperature range: C17200 maintains spring performance better than phosphor bronze under moderate heat.
• Cyclic loading count: >100k cycles → C17200 is strongly recommended.
• Strip thickness & stamping process: Annealed C17200 for deep stamping; TH04 aged temper for finished elastic parts.
• Budget: C17200 has higher raw material cost than phosphor bronze, but reduces part failure rate in high-reliability assemblies.
• Compliance & documentation: We can supply MTR for UNS C17200 strip to meet component approval requirements.

Electrical Connectors: Spring terminals, contact fingers, EV connector contacts

Precision Springs: Relay springs, switch springs, test probe spring components

EMI & RFI Shielding: Shielding gaskets, RF cabinet shielding fingers, electromagnetic shielding parts

Semiconductor & Test Equipment: Test socket contacts, precision instrument elastic parts

As a professional China manufacturer and supplier of UNS C17200 Beryllium Copper Strip (CuBe2 / CDA 172), we specialize in producing high-strength spring copper alloys for connectors, springs, and EMI shielding applications. With ISO 9001-certified quality management, full traceability, and mill test certificates with every shipment, we deliver consistent quality, competitive pricing, and fast lead times to customers worldwide.

Whether you need standard tempers, custom slitting, or tailored surface treatment, our technical team supports your project from material selection to final delivery - making us your trusted partner for C17200 Beryllium Copper Strip and other high-strength copper alloys.

Our Factory 

 

Beryllium Copper Strip Production Line 

Beryllium Copper Strip Slitting Equipment

Beryllium Copper Strip Slitting In Production 

Rotating+Passing Eddy Current Flaw Detector

Electron Microscope

German Spike Spectral Analyzer

Q1: What is UNS C17200 Beryllium Copper Strip?
A: UNS C17200 Beryllium Copper Strip is a high-strength precipitation-hardening copper-beryllium alloy supplied in strip or coil form. It is commonly known as CuBe2, CDA 172, or Alloy 25 and is widely used for connectors, springs, electrical contacts and EMI shielding components.

Q2: Is C17200 the same as CuBe2 and CDA 172?
A: C17200, CuBe2 and CDA 172 are commonly used designations associated with this beryllium copper alloy. The exact material specification should always be confirmed against the applicable standard and purchase requirements.

Q3: Why is C17200 Beryllium Copper Strip used for connectors?
A: C17200 combines high strength, spring properties and useful electrical conductivity. This allows connector components to maintain reliable contact force while providing electrical performance and good resistance to repeated cycling.

Q4: Why is C17200 suitable for springs?
A: After appropriate heat treatment, C17200 can achieve high strength, excellent elastic properties, good fatigue resistance and resistance to stress relaxation. These properties make it suitable for precision springs and contact springs.

Q5: Can C17200 Beryllium Copper Strip be used for EMI shielding?
A: Yes. C17200 is used for EMI shielding fingers, shielding clips, spring contacts and other shielding components where electrical contact and stable mechanical pressure are required.

Q6: What is the difference between C17200 and ordinary copper strip?
A: Pure copper provides excellent electrical conductivity but has much lower mechanical strength. C17200 provides a useful combination of high mechanical strength, spring performance and electrical conductivity, making it more suitable for demanding spring and contact applications.

Q7: What C17200 Beryllium Copper Strip sizes are available?
A: We can supply different thicknesses and widths according to production capability and customer requirements. Custom sizes can also be considered for OEM applications.

Q8: Is C17200 the same as Alloy 25?

A: Yes. Alloy 25 is a widely used commercial designation for UNS C17200. Other equivalent designations include CuBe2, CDA 172, and ISO CuBe2.

Q9: What C17200 temper should I choose?
A: The correct temper depends on the forming process and final performance requirements. Softer conditions may be preferred for forming, while age-hardened conditions are generally selected when higher strength and spring performance are required. We can recommend a suitable condition based on your application.

Q10: Is C17200 strip magnetic?

A: No. C17200 is non-magnetic, making it suitable for magnetic-sensitive instrumentation and applications where magnetic attraction must be avoided.

Q11: What is the chemical composition of Beryllium Copper C17200?

A: C17200 contains 1.80–2.00% Beryllium, Co+Ni min 0.20%, Co+Ni+Fe max 0.6%, Pb max 0.02%, with copper plus named elements at a minimum of 99.5%. The nominal beryllium content is typically 1.9%, which is why it is also referred to as Alloy 25.

Q12: What are the mechanical properties of Beryllium Copper C17200?

A: Mechanical properties vary by temper. In the age-hardened (AT) condition, C17200 achieves yield strengths of 1,000–1,210 MPa (145–175 ksi) and tensile strengths of 1,140–1,380 MPa (165–200 ksi), with elongation of 4–10%. In mill-hardened tempers, yield strength ranges from approximately 750–970 MPa depending on the specific temper, with hardness reaching 363 DPH (Super HM). The elastic modulus is 131 GPa.

Q13: What is the difference between C17200 and C17300?

A: Both are beryllium copper alloys, but C17300 (CuBe2Pb) contains 0.20–0.60% lead as a deliberate addition for improved machinability. C17200 has max 0.02% Pb and is preferred for applications requiring the highest strength and conductivity. C17300 is commonly used for fasteners, screws, and precision machined parts where chip formation and tool life are critical.

Q14: What is ASTM B194 C17200?

A: ASTM B194 is the standard specification for copper-beryllium alloy plate, sheet, strip, and rolled bar. It covers UNS Nos. C17000 and C17200. Importantly, unless otherwise specified in the purchase order, C17200 shall be the alloy furnished - making it the default beryllium copper strip material under this standard.

Q15: How can I make sure the C17200 strip is suitable for my application?
A: Provide your component application, required thickness and width, forming process, mechanical requirements, electrical conductivity requirements and operating conditions. Our technical team can help evaluate the appropriate C17200 / CuBe2 / CDA 172 material condition.

Q16: Where can I find Beryllium copper suppliers?

A: If you are looking for a reliable Beryllium copper supplier for C17200 strip, rod, wire, or custom profiles, HSMetal is a professional China manufacturer and supplier of high-strength copper alloys. You can search "HSMetal Beryllium Copper" to find our official website, view our full product range, and request a quotation directly. We supply ASTM B194 compliant C17200 with mill test certificates and ISO 9001 quality assurance.

Q17: What is the Beryllium Copper Scrap Price?

A: Scrap pricing for beryllium copper is not publicly standardized the way primary copper is, as it depends on alloy grade, contamination level, and local market conditions. Beryllium copper scrap typically commands a premium over common copper scrap due to the value of the beryllium content. For current pricing, consult your local scrap dealer or metal recycling facility with the specific alloy designation (C17200 / C17300) and condition.

Q18: What is C17200 used for?

A: C17200 is specified for applications requiring the highest strength and conductivity combination among copper alloys: connectors, spring contacts, relay blades, fuse clips, Belleville washers, navigational instruments, non-sparking safety tools, pump parts, and downhole components. Its non-magnetic and non-sparking properties make it essential for oil & gas and hazardous environment applications.

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