Copper Alloys•Beryllium Copper•

VERIFIED(Source-Verified)

C17500 Beryllium Copper (Alloy 10)

Primary Designation:UNS C17500

Aliases:

Alloy 10Beryllium Copper 10C17500

Mat Grades internal verification confirms source-backed fidelity and data integrity. It does not constitute external certification or guaranteed lot conformity. Read engineering disclaimer →

Download PDF Download Excel

Data Completeness:6 composition elements and 68 condition-specific property values cataloged.

Omitted fields represent unverified properties. "Missing is better than invented."

Key Engineering Properties

Representative source rows, qualified by their reported conditions. Inspect the tables below for all values, limits, and source notes.

Density

8.608 g/cm³TYPICAL · at 20 °C

Electrical Conductivity

45 % IACSTYPICAL · at 20 °C

Thermal Conductivity

207.69 W/(m·K)TYPICAL · at 20 °C

Specific Heat Capacity

418.7 J/(kg·K)TYPICAL · at 20 °C

Melting Range (Solidus / Liquidus)

1029.4 – 1068.3 °C1885.0 – 1955.0 °F

Solidus: 1029.4°C | Liquidus: 1068.3°C

Composition Excerpt

Cu BALANCE wt%Copper (balance)

Standard Elemental Basis: BALANCE

Engineering Summary

UNS C17500 Beryllium Copper (Alloy 10) is a precipitation-hardenable copper-cobalt-beryllium alloy (0.4-0.7% Be, 2.4-2.7% Co) offering high electrical conductivity (45% to 48% IACS) and thermal conductivity combined with moderate-to-high tensile strength (up to 760 MPa) for resistance welding electrodes, plunger tips, and high-current electrical switches.

C17500 Beryllium Copper (Alloy 10) Documented Applications

›Conductors: Corrosion Resistance
›Conductors: Creep Properties
›Conductors: Mechanical Properties
›Conductors: Softening Resistance
›Conductors: Solderability
›Connectors: Conductivity (Electrical)
›Connectors: Conductivity (Thermal)
›Connectors: Corrosion Resistance
›Connectors: Mechanical Properties
›Connectors: Softening Resistance
›Die casting plunger tips: Corrosion Resistance
›Die casting plunger tips: Creep Properties

Recognized Aliases

Source-backed commercial trade name and short designations cataloged in canonical data.

Alloy 10Beryllium Copper 10C17500

C17500 Beryllium Copper (Alloy 10) Specifications & Designations

Standard Designations & Applicable Specifications — Semantically classified designations distinguishing primary standard identifiers, commercial trade names, and applicable specification references.

Direct Standard DesignationsDIRECT DESIGNATION

2 Primary Identifiers

Scroll horizontally for full designation data

System	Identifier	Standard System Name	Classification Notes & Provenance
UNSPRIMARY	C17500	Unified Numbering System	Unified Numbering System standard designation for copper alloys (CDA / SAE / ASTM)Ref: CDA UNS Standard Designations Register (C17500)
CDA	Alloy 175	Copper Development Association Alloy Number	CDA three-digit legacy designationRef: CDA UNS Standard Designations Register (C17500)

Recognized Commercial Aliases & Trade NamesCOMMON ALIAS

4 Listed

Scroll horizontally for full alias classifications

Recognized Name / Alias	Classification	Technical Usage & Context
Beryllium Copper Alloy 10	Standard Commercial Name	CDA Standard Commercial Name
Alloy 10	Commercial Alias	Colloquial or commercial industry synonym
Beryllium Copper 10	Commercial Alias	Colloquial or commercial industry synonym
C17500	Commercial Alias	Colloquial or commercial industry synonym

Applicable Specifications & Product Form ReferencesSPECIFICATION REFERENCE

8 Applicable Standards

Scroll horizontally for full standard specifications

Standards Body	Specification Code	Specification Title / Scope	Relationship Type
ASTM	ASTM B441	COPPER-COBALT-BERYLLIUM (UNS NO. C17500) AND COPPER-NICKEL-BERYLLIUM (UNS NO. C17510) ROD AND BAR	Specification Reference
ASTM	ASTM B534	COPPER-COBALT-BERYLLIUM ALLOY, PLATE, SHEET, STRIP, AND ROLLED BAR	Specification Reference
ASTM	ASTM B870	COPPER-BERYLLIUM ALLOY FORGINGS AND EXTRUSION ALLOYS (UNS Nos. C17500 AND C17510)	Specification Reference
SAE	SAE J463	WROUGHT COPPER AND COPPER ALLOYS	Specification Reference
SAE	SAE J461	WROUGHT AND CAST COPPER ALLOYS	Specification Reference
ASTM	ASTM B937	COPPER-BERYLLIUM SEAMLESS TUBE (UNS Nos.17500 and 17510)	Specification Reference
MILITARY	MILITARY MIL-C-81021	COPPER BERYLLIUM ALLOY (COPPER ALLOY NUMBERS C17500 AND C17510) STRIP	Specification Reference
ASTM	ASTM B888/B88M	COPPER ALLOY STRIP FOR USE IN MANUFACTURE OF ELECTRICAL CONNECTORS OR SPRING CONTACTS	Specification Reference

Engineering Notice: Applicable specifications establish manufacturing requirements, dimensional tolerances, and test criteria for specific product forms (e.g. bus bar, wire, plate, pipe). They represent applicable technical standards, not alternative or equivalent alloy grades.

C17500 Beryllium Copper (Alloy 10) Chemical Composition

Chemical Composition (Weight %) — Elemental limits and values from the cited source. Preserves exact semantic limits (minimums, maximums, and ranges).

Scroll horizontally for full elemental limits

Element	Symbol	Atomic No.	Semantic Basis	Specified Value	Unit	Metallurgical Notes & Qualification	Data Status
Copper	Cu	29	BALANCE	Balance	wt%	Remainder element (Copper).Ref: Copper Development Association (CDA)	VERIFIED
Iron	Fe	26	MAXIMUM	≤ 0.10	wt%	CDA chemical composition specification limits for C17500: max 0.1 wt%.Ref: Copper Development Association (CDA)	VERIFIED
Aluminum	Al	13	MAXIMUM	≤ 0.20	wt%	CDA chemical composition specification limits for C17500: max 0.2 wt%.Ref: Copper Development Association (CDA)	VERIFIED
Beryllium	Be	4	RANGE	0.40 – 0.70	wt%	CDA chemical composition specification limits for C17500: 0.4 - 0.7 wt%.Ref: Copper Development Association (CDA)	VERIFIED
Cobalt	Co	27	RANGE	2.40 – 2.70	wt%	CDA chemical composition specification limits for C17500: 2.4 - 2.7 wt%.Ref: Copper Development Association (CDA)	VERIFIED
Silicon	Si	14	MAXIMUM	≤ 0.20	wt%	CDA chemical composition specification limits for C17500: max 0.2 wt%.Ref: Copper Development Association (CDA)	VERIFIED

* Elemental percentages are expressed in weight percent (wt%). Values represent applicable specification limits. Unspecified trace elements are not fabricated or assumed.Preserves exact semantic basis

Property Display UnitsSwitch between Canonical SI and Source / US Customary units:

C17500 Beryllium Copper (Alloy 10) Physical Properties

Source-specific physical properties. Test temperatures are shown only where reported.

1 Parameters

Scroll horizontally for full property parameters

Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Density	8.608 g/cm³	TYPICAL	Test Temp: 20 °CCDA Physical Properties: Density 0.311 lb/cu in. at 68°F (8.608 g/cm³ at 20°C)	0.311 lb/cu in. at 68°F	Copper Development Association Inc.	VERIFIED

C17500 Beryllium Copper (Alloy 10) Thermal & Thermodynamic Properties

Phase change temperatures, thermal conductivity, specific heat, mean coefficients of thermal expansion across standardized temperature ranges, and recommended thermal processing windows.

5 Parameters

Scroll horizontally for full property parameters

Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Liquidus Temperature	1068.3 °C	TYPICAL	CDA Physical Properties: Liquidus temperature 1955.0 °F (1068.3 °C)	1955.0 °F	Copper Development Association Inc.	VERIFIED
Solidus Temperature	1029.4 °C	TYPICAL	CDA Physical Properties: Solidus temperature 1885.0 °F (1029.4 °C)	1885.0 °F	Copper Development Association Inc.	VERIFIED
Thermal Conductivity	207.69 W/(m·K)	TYPICAL	Test Temp: 20 °CCDA Physical Properties: Thermal conductivity 120.0 Btu/(ft·hr·°F) (207.69 W/(m·K) at 20°C)	120.0 Btu/ sq ft/ ft hr/ °F at 68°F	Copper Development Association Inc.	VERIFIED
Coefficient of Thermal Expansion (CTE)	17.64 µm/(m·K)	TYPICAL	CDA Physical Properties: CTE 9.8 µin/(in·°F) (17.64 µm/(m·K)) over range 68-39210°F	9.8 10^-6 per °F	Copper Development Association Inc.	VERIFIED
Specific Heat Capacity	418.7 J/(kg·K)	TYPICAL	Test Temp: 20 °CCDA Physical Properties: Specific heat 0.1 Btu/(lb·°F) (418.7 J/(kg·K))	0.1 Btu/ lb /°F at 68°F	Copper Development Association Inc.	VERIFIED

C17500 Beryllium Copper (Alloy 10) Electrical Properties

Electrical conductivity and resistivity in their reported units and conditions.

1 Parameters

Scroll horizontally for full property parameters

Property Parameter	Canonical SI Value	Semantic Basis	Test Temperature / Context Range	Source Raw Reference	Source Reference	Status
Electrical Conductivity	45 % IACS	TYPICAL	Test Temp: 20 °CCDA Physical Properties: Volume conductivity 45.0 % IACS at 68°F (20°C)	45.0 % IACS at 68°F	Copper Development Association Inc.	VERIFIED

C17500 Beryllium Copper (Alloy 10) Mechanical Properties

Contextual Mechanical Properties & Tempers: Engineering strength, ductility, and hardness values grouped by product form, temper, and section thickness. Mechanical properties are contextual and not isotropic averages.

Elastic & Baseline Mechanical ConstantsSource-specific measurement conditions

Modulus of Elasticity (Tension)

131 GPa

CDA Physical Properties: Elastic modulus in tension 19000.0 ksi (131.0 GPa)

Modulus of Rigidity

51710.7 MPa

CDA Physical Properties: Shear modulus 7500.0 ksi (51710.7 MPa)

Machinability Rating

40 %

CDA Fabrication Properties: Rating relative to Free-Cutting Brass (C36000 = 100%).

Product Form:

Temper / Condition:

Showing 30 of 30 conditions

Scroll horizontally for all conditions & tempers

Product Form	Temper / Condition	Section Size	Tensile (UTS)	Yield Strength	Elongation	Shear Strength	Fatigue Strength	Hardness (Scales Preserved)	Status
Flat Products	Hard and Precipitation Heat Treated (TH04) · 20 °C Source values and qualifiers Tensile Strength: 758.4 MPa (TYPICAL)Copper Development Association (CDA) — Yield Strength (0.5% Ext): 655 MPa (TYPICAL)Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 8 % (TYPICAL)Copper Development Association (CDA) — TH04	—	758.4 MPa	655 MPa	8 %	—	—	—	VERIFIED
Flat Products	Hard and Precipitation Heat Treated (TH04) Source values and qualifiers Rockwell B Hardness: 98 HRB (TYPICAL)Copper Development Association (CDA) — Rockwell 30T Hardness: 81 HR30T (TYPICAL)Copper Development Association (CDA) — TH04	—	—	—	—	—	—	98 HRB81 HR30T	VERIFIED
Flat Products	Precipitation Hardened (TF00) · 20 °C Source values and qualifiers Tensile Strength: 689.5 MPa (TYPICAL)Copper Development Association (CDA) — Yield Strength (0.5% Ext): 551.6 MPa (TYPICAL)Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 10 % (TYPICAL)Copper Development Association (CDA) — TF00	—	689.5 MPa	551.6 MPa	10 %	—	—	—	VERIFIED
Flat Products	Precipitation Hardened (TF00) Source values and qualifiers Rockwell B Hardness: 96 HRB (TYPICAL)Copper Development Association (CDA) — Rockwell 30T Hardness: 80 HR30T (TYPICAL)Copper Development Association (CDA) — TF00	—	—	—	—	—	—	96 HRB80 HR30T	VERIFIED
Flat Products	Solution Heat Treated (TB00) · 20 °C Source values and qualifiers Tensile Strength: 241.3 MPa (TYPICAL)Copper Development Association (CDA) — Yield Strength (0.5% Ext): 172.4 MPa (TYPICAL)Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 20 % (TYPICAL)Copper Development Association (CDA) — TB00	—	241.3 MPa	172.4 MPa	20 %	—	—	—	VERIFIED
Flat Products	Solution Heat Treated (TB00) Source values and qualifiers Rockwell B Hardness: 32 HRB (TYPICAL)Copper Development Association (CDA) — Rockwell 30T Hardness: 36 HR30T (TYPICAL)Copper Development Association (CDA) — TB00	—	—	—	—	—	—	32 HRB36 HR30T	VERIFIED
Flat Products	Solution Heat Treated and Cold Worked: 1/2 Hard (TD02) · 20 °C Source values and qualifiers Tensile Strength: 468.8 MPa (TYPICAL)Copper Development Association (CDA) — Yield Strength (0.5% Ext): 413.7 MPa (TYPICAL)Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 8 % (TYPICAL)Copper Development Association (CDA) — TD02	—	468.8 MPa	413.7 MPa	8 %	—	—	—	VERIFIED
Flat Products	Solution Heat Treated and Cold Worked: 1/2 Hard (TD02) Source values and qualifiers Rockwell B Hardness: 70 HRB (TYPICAL)Copper Development Association (CDA) — Rockwell 30T Hardness: 64 HR30T (TYPICAL)Copper Development Association (CDA) — TD02	—	—	—	—	—	—	70 HRB64 HR30T	VERIFIED
Flat Products	Solution Heat Treated and Cold Worked: Hard (TD04) · 20 °C Source values and qualifiers Tensile Strength: 482.6 MPa (TYPICAL)Copper Development Association (CDA) — Yield Strength (0.5% Ext): 379.2 MPa (TYPICAL)Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 3 % (TYPICAL)Copper Development Association (CDA) — TD04	—	482.6 MPa	379.2 MPa	3 %	—	—	—	VERIFIED
Flat Products	Solution Heat Treated and Cold Worked: Hard (TD04) Source values and qualifiers Rockwell B Hardness: 83 HRB (TYPICAL)Copper Development Association (CDA) — Rockwell 30T Hardness: 72 HR30T (TYPICAL)Copper Development Association (CDA) — TD04	—	—	—	—	—	—	83 HRB72 HR30T	VERIFIED
Forgings	Precipitation Hardened (TF00) · 20 °C Source values and qualifiers Tensile Strength: 792.9 MPa (TYPICAL)Section Size: 4; Section Size: 4 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 620.5 MPa (TYPICAL)Section Size: 4; Section Size: 4 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — TF00	4	792.9 MPa	620.5 MPa	—	—	—	—	VERIFIED
Forgings	Precipitation Hardened (TF00) Source values and qualifiers Rockwell B Hardness: 92 HRB (TYPICAL)Section Size: 4; Section Size: 4 inCopper Development Association (CDA) — TF00	4	—	—	—	—	—	92 HRB	VERIFIED
Forgings	Solution Heat Treated (TB00) · 20 °C Source values and qualifiers Tensile Strength: 289.6 MPa (TYPICAL)Copper Development Association (CDA) — Yield Strength (0.5% Ext): 137.9 MPa (TYPICAL)Yield strength at 0.5% extension under loadCopper Development Association (CDA) — TB00	—	289.6 MPa	137.9 MPa	—	—	—	—	VERIFIED
Forgings	Solution Heat Treated (TB00) Source values and qualifiers Rockwell B Hardness: 50 HRB (TYPICAL)Copper Development Association (CDA) — TB00	—	—	—	—	—	—	50 HRB	VERIFIED
Rod	Hard and Precipitation Heat Treated (TH04) · 20 °C Source values and qualifiers Tensile Strength: 792.9 MPa (TYPICAL)Copper Development Association (CDA) — Yield Strength (0.5% Ext): 758.4 MPa (TYPICAL)Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 14 % (TYPICAL)Copper Development Association (CDA) — TH04	—	792.9 MPa	758.4 MPa	14 %	—	—	—	VERIFIED
Rod	Hard and Precipitation Heat Treated (TH04) Source values and qualifiers Rockwell B Hardness: 98 HRB (TYPICAL)Copper Development Association (CDA) — TH04	—	—	—	—	—	—	98 HRB	VERIFIED
Rod	Precipitation Hardened (TF00) · 20 °C Source values and qualifiers Tensile Strength: 758.4 MPa (TYPICAL)Copper Development Association (CDA) — Yield Strength (0.5% Ext): 620.5 MPa (TYPICAL)Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 18 % (TYPICAL)Copper Development Association (CDA) — TF00	—	758.4 MPa	620.5 MPa	18 %	—	—	—	VERIFIED
Rod	Precipitation Hardened (TF00) Source values and qualifiers Rockwell B Hardness: 96 HRB (TYPICAL)Copper Development Association (CDA) — TF00	—	—	—	—	—	—	96 HRB	VERIFIED
Rod	Solution Heat Treated (TB00) · 20 °C Source values and qualifiers Tensile Strength: 310.3 MPa (TYPICAL)Copper Development Association (CDA) — Yield Strength (0.5% Ext): 172.4 MPa (TYPICAL)Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 28 % (TYPICAL)Copper Development Association (CDA) — TB00	—	310.3 MPa	172.4 MPa	28 %	—	—	—	VERIFIED
Rod	Solution Heat Treated (TB00) Source values and qualifiers Rockwell B Hardness: 35 HRB (TYPICAL)Copper Development Association (CDA) — TB00	—	—	—	—	—	—	35 HRB	VERIFIED
Rod	Solution Heat Treated and Cold Worked: Hard (TD04) · 20 °C Source values and qualifiers Tensile Strength: 496.4 MPa (TYPICAL)Copper Development Association (CDA) — Yield Strength (0.5% Ext): 448.2 MPa (TYPICAL)Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 12 % (TYPICAL)Copper Development Association (CDA) — TD04	—	496.4 MPa	448.2 MPa	12 %	—	—	—	VERIFIED
Rod	Solution Heat Treated and Cold Worked: Hard (TD04) Source values and qualifiers Rockwell B Hardness: 68 HRB (TYPICAL)Copper Development Association (CDA) — TD04	—	—	—	—	—	—	68 HRB	VERIFIED
Tube	Hard and Precipitation Heat Treated (TH04) · 20 °C Source values and qualifiers Tensile Strength: 758.4 MPa (TYPICAL)Copper Development Association (CDA) — Yield Strength (0.5% Ext): 551.6 MPa (TYPICAL)Yield strength at 0.5% extension under loadCopper Development Association (CDA) — TH04	—	758.4 MPa	551.6 MPa	—	—	—	—	VERIFIED
Tube	Hard and Precipitation Heat Treated (TH04) Source values and qualifiers Rockwell B Hardness: 95 HRB (TYPICAL)Copper Development Association (CDA) — TH04	—	—	—	—	—	—	95 HRB	VERIFIED
Tube	Precipitation Hardened (TF00) · 20 °C Source values and qualifiers Tensile Strength: 689.5 MPa (TYPICAL)Copper Development Association (CDA) — Yield Strength (0.5% Ext): 551.6 MPa (TYPICAL)Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 45 % (TYPICAL)Copper Development Association (CDA) — TF00	—	689.5 MPa	551.6 MPa	45 %	—	—	—	VERIFIED
Tube	Precipitation Hardened (TF00) Source values and qualifiers Rockwell B Hardness: 92 HRB (TYPICAL)Copper Development Association (CDA) — TF00	—	—	—	—	—	—	92 HRB	VERIFIED
Tube	Solution Heat Treated (TB00) · 20 °C Source values and qualifiers Tensile Strength: 241.3 MPa (TYPICAL)Copper Development Association (CDA) — TB00	—	241.3 MPa	—	—	—	—	—	VERIFIED
Tube	Solution Heat Treated (TB00) Source values and qualifiers Rockwell B Hardness: 50 HRB (TYPICAL)Copper Development Association (CDA) — TB00	—	—	—	—	—	—	50 HRB	VERIFIED
Tube	Solution Heat Treated and Cold Worked: Hard (TD04) · 20 °C Source values and qualifiers Tensile Strength: 448.2 MPa (TYPICAL)Copper Development Association (CDA) — TD04	—	448.2 MPa	—	—	—	—	—	VERIFIED
Tube	Solution Heat Treated and Cold Worked: Hard (TD04) Source values and qualifiers Rockwell B Hardness: 60 HRB (TYPICAL)Copper Development Association (CDA) — TD04	—	—	—	—	—	—	60 HRB	VERIFIED

Hardness Integrity Notice: Rockwell B (HRB), Rockwell F (HRF), and Superficial 30T (HR30T) scales are reported on their measured scales without cross-scale mathematical conversion.

Source: See fact-level citations

C17500 Beryllium Copper (Alloy 10) Processing & Fabrication

Machining, joining, forming, and thermal processing ratings cataloged from the cited authoritative technical reference.

Source: Copper Development Association (CDA)

Machinability

Machinability rating: 40% relative to free-cutting brass (C36000 = 100%).

Weldability & Joining

Soldering: Good; Brazing: Good; Oxyacetylene Welding: Not Recommended; Gas Shielded Arc Welding: Fair; Coated Metal Arc Welding: Fair; Spot Weld: Good; Seam Weld: Fair; Butt Weld: Fair

Forming & Cold Working

Capacity for Being Cold Worked: Excellent. Capacity for Being Hot Formed: Good.

Practical Engineering & Fabrication Notes

By Mat Grades Editorial Desk · Updated 2026-11-14. Use alongside the specified product standard and supplier certificate.

Machining & shop-floor behavior

The cataloged machining note for C17500 Beryllium Copper (Alloy 10) states: Machinability rating: 40% relative to free-cutting brass (C36000 = 100%). A relevant hardness example is Rockwell B Hardness: 98 HRB (typical; Hard and Precipitation Heat Treated (TH04), TH04, Flat Products). Use that supplied condition for a trial of the difficult feature. Record tool changes, burr removal, unclamped dimensions and accepted parts per hour. Relative machinability ratings from different reference scales should not be compared as if they were one common test.

Weldability, brazing & joining

The available joining assessment states: Soldering: Good; Brazing: Good; Oxyacetylene Welding: Not Recommended; Gas Shielded Arc Welding: Fair; Coated Metal Arc Welding: Fair; Spot Weld: Good; Seam Weld: Fair; Butt Weld: Fair The first cataloged strength example is Tensile Strength: 758.4 MPa (typical; Hard and Precipitation Heat Treated (TH04), TH04, Flat Products; test temperature 20 °C). Assess the final part after joining or thermal processing. Include distortion, cleanup and inspection in the quotation. A material designation or favorable process rating is a starting point for qualification, not evidence that an untested joint meets the drawing.

Corrosion & service environment

Review the working fluid, cleaning agents and dissimilar-metal contacts as separate exposures. The word copper, brass or bronze is too broad to establish compatibility. A process rating does not qualify a pressure boundary, and a thermal-property measurement does not establish a continuous service-temperature limit. The recorded thermal example is Thermal Conductivity: 207.69 W/(m·K) (typical; ; test temperature 20 °C). State the exposure and inspection access in the design record so that a change of installation or cleaning method triggers a review. The selected composition entries are Fe maximum 0.1 wt%, Al maximum 0.2 wt%. Chemistry documents identity; it does not establish fluid compatibility.

Selection trade-offs & applications

Use UNS C17500, COMMERCIAL Beryllium Copper Alloy 10, CDA Alloy 175 to identify the candidate, then specify the product form and delivered condition separately. The catalog lists Conductors: Corrosion Resistance as an application example. The related candidate C17510 Beryllium Copper (Alloy 3) is linked for comparison; its close equivalent relationship must be checked before substitution. Compare the complete route through machining, joining, finish and inspection. Keep the certificate, required test location and acceptance criteria with the first-article record. A later change of grade, condition or source should be assessed against that same requirement.

Technical references: Copper Development Association (CDA); Copper Development Association (CDA)

C17500 Beryllium Copper (Alloy 10) Equivalent & Comparable Grades

Comparable Grades & Cross-References: Carefully classified cross-reference relationships for C17500 Beryllium Copper (Alloy 10). Comparable does not mean equivalent.

Scroll horizontally for relationship classifications & comparisons

Related Material	Family	Relationship Classification	Metallurgical Notes & Differences	Status	Action
C17510 Beryllium Copper (Alloy 3)	Copper Alloys	Close Equivalent	C17500 (Alloy 10 Cu-Co-Be) and C17510 (Alloy 3 Cu-Ni-Be) are high-conductivity beryllium coppers sharing equivalent mechanical strength (up to 760 MPa) and 45-60% IACS conductivity envelopes.Direct commercial substitution is generally permissible subject to certified Mill Test Report (MTR) confirmation for critical applications.	VERIFIED
C17200 Beryllium Copper (Alloy 25)	Copper Alloys	Commonly Compared	C17500 provides 45% IACS electrical conductivity with moderate strength (up to 760 MPa), whereas C17200 provides extreme strength (up to 1400 MPa) at 22% IACS conductivity.Materials serve different design priorities (e.g. higher strength vs superior corrosion resistance or cost).	VERIFIED

Beryllium Copper Alloy Family

Copper alloys sharing common alloying formulations and metallurgical classifications under the Beryllium Copper branch.

3 Adjacent Grades

C17200

C17200 Beryllium Copper (Alloy 25)

View Grade →

C17500Current Grade

C17500 Beryllium Copper (Alloy 10)

C17510

C17510 Beryllium Copper (Alloy 3)

View Grade →

Sources

Sources & Provenance Trail: Authoritative reference publications, standards specifications, and data registers cited across this material record.

Copper Development Association Inc.CDA Alloy C17500 Property & Specification Profile

AUTHORITATIVE BODY

Copper Development Association authoritative technical reference profile for C17500 Beryllium Copper (Alloy 10).

Issuing Body: Copper Development Association (CDA)View Source Record ↗

Copper Development Association Inc.CDA UNS Standard Designations Register (C17500)

AUTHORITATIVE BODY

Unified Numbering System (UNS) designation registration register confirming active C17500 status.

Issuing Body: Copper Development Association (CDA)View Source Record ↗

Intellectual Property & Provenance Notice: Mat Grades cites technical literature from recognized industry associations and standards organizations. Underlying technical standards and publication data remain the intellectual property of their respective issuing organizations.