C26800 Yellow Brass 66%
Primary Designation:UNS C26800
Aliases:
Yellow Brass 66%66-34 BrassC26800
Mat Grades internal verification confirms source-backed fidelity and data integrity. It does not constitute external certification or guaranteed lot conformity. Read engineering disclaimer →
Data Completeness:4 composition elements and 107 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
8.47 g/cm³TYPICAL · at 20 °C
Electrical Conductivity
27 % IACSTYPICAL · at 20 °C
Thermal Conductivity
115.96 W/(m·K)TYPICAL · at 20 °C
Specific Heat Capacity
376.8 J/(kg·K)TYPICAL · at 20 °C
Melting Range (Solidus / Liquidus)
904.4 – 932.2 °C1660.0 – 1710.0 °F
Solidus: 904.4°C | Liquidus: 932.2°CComposition Excerpt
Cu 64–68.5 wt%Copper (range)
Standard Elemental Basis: RANGEEngineering Summary
UNS C26800 Yellow Brass 66% (64.0-68.5% Cu, Zn Remainder) is a single-phase alpha brass exhibiting excellent cold ductility, drawability, and stamping capacity. It is widely used for architectural hardware, plumbing accessories, radiator cores, and deep-drawn components.
C26800 Yellow Brass 66% Documented Applications
- ›Air Pressure Conveyer Systems: Forming Characteristics
- ›Air Pressure Conveyer Systems: Mechanical Properties
- ›Air Pressure Conveyer Systems: Pressure Tight
- ›Architecture: Grillwork
- ›Automotive: Radiator Cores
- ›Bathroom Fixtures: Corrosion Resistance
- ›Bathroom Fixtures: Forming Characteristics
- ›Bathroom Fixtures: Mechanical Properties
- ›Bead Chain: Corrosion Resistance
- ›Bead Chain: Forming Characteristics
- ›Bead Chain: Mechanical Properties
- ›Builders Hardware: Finish Hardware
Recognized Aliases
Source-backed commercial trade name and short designations cataloged in canonical data.
Yellow Brass 66%66-34 BrassC26800
C26800 Yellow Brass 66% 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 IdentifiersScroll horizontally for full designation data
| System | Identifier | Standard System Name | Classification Notes & Provenance |
|---|---|---|---|
| UNSPRIMARY | C26800 | Unified Numbering System | Unified Numbering System standard designation for copper alloys (CDA / SAE / ASTM)Ref: CDA UNS Standard Designations Register (C26800) |
| CDA | Alloy 268 | Copper Development Association Alloy Number | CDA three-digit legacy designationRef: CDA UNS Standard Designations Register (C26800) |
Recognized Commercial Aliases & Trade NamesCOMMON ALIAS
3 ListedScroll horizontally for full alias classifications
| Recognized Name / Alias | Classification | Technical Usage & Context |
|---|---|---|
| Yellow Brass 66% | Standard Commercial Name | CDA Standard Commercial Name |
| 66-34 Brass | Commercial Alias | Colloquial or commercial industry synonym |
| C26800 | Commercial Alias | Colloquial or commercial industry synonym |
Applicable Specifications & Product Form ReferencesSPECIFICATION REFERENCE
6 Applicable StandardsScroll horizontally for full standard specifications
| Standards Body | Specification Code | Specification Title / Scope | Relationship Type |
|---|---|---|---|
| SAE | SAE J461 | WROUGHT AND CAST COPPER ALLOYS | Specification Reference |
| ASTM | ASTM B36/B36M | BRASS PLATE, SHEET, STRIP AND ROLLED BAR | Specification Reference |
| SAE | SAE J463 | WROUGHT COPPER AND COPPER ALLOYS | Specification Reference |
| ASTM | ASTM B927/B927M | BRASS ROD, BAR, AND SHAPES | Specification Reference |
| ASTM | ASTM B587 | WELDED BRASS TUBE | Specification Reference |
| MILITARY | MILITARY MIL-W-6712 | WIRE, METALLIZING | 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.
C26800 Yellow Brass 66% 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 | RANGE | 64.00 – 68.50 | wt% | CDA chemical composition specification limits for C26800: 64.0 - 68.5 wt%.Ref: Copper Development Association (CDA) | VERIFIED |
| Lead | Pb | 82 | MAXIMUM | ≤ 0.09 | wt% | CDA chemical composition specification limits for C26800: max 0.09 wt%.Ref: Copper Development Association (CDA) | VERIFIED |
| Zinc | Zn | 30 | BALANCE | Balance | wt% | Remainder element (Zinc).Ref: Copper Development Association (CDA) | VERIFIED |
| Iron | Fe | 26 | MAXIMUM | ≤ 0.05 | wt% | CDA chemical composition specification limits for C26800: max 0.05 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:
C26800 Yellow Brass 66% Physical Properties
Source-specific physical properties. Test temperatures are shown only where reported.
Scroll horizontally for full property parameters
| Property Parameter | Canonical SI Value | Semantic Basis | Test Temperature / Context Range | Source Raw Reference | Source Reference | Status |
|---|---|---|---|---|---|---|
| Density | 8.47 g/cm³ | TYPICAL | Test Temp: 20 °CCDA Physical Properties: Density 0.306 lb/cu in. at 68°F (8.47 g/cm³ at 20°C) | 0.306 lb/cu in. at 68°F | Copper Development Association Inc. | VERIFIED |
C26800 Yellow Brass 66% Thermal & Thermodynamic Properties
Phase change temperatures, thermal conductivity, specific heat, mean coefficients of thermal expansion across standardized temperature ranges, and recommended thermal processing windows.
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 | 932.2 °C | TYPICAL | CDA Physical Properties: Liquidus temperature 1710.0 °F (932.2 °C) | 1710.0 °F | Copper Development Association Inc. | VERIFIED |
| Solidus Temperature | 904.4 °C | TYPICAL | CDA Physical Properties: Solidus temperature 1660.0 °F (904.4 °C) | 1660.0 °F | Copper Development Association Inc. | VERIFIED |
| Thermal Conductivity | 115.96 W/(m·K) | TYPICAL | Test Temp: 20 °CCDA Physical Properties: Thermal conductivity 67.0 Btu/(ft·hr·°F) (115.96 W/(m·K) at 20°C) | 67.0 Btu/ sq ft/ ft hr/ °F at 68°F | Copper Development Association Inc. | VERIFIED |
| Coefficient of Thermal Expansion (CTE) | 20.34 µm/(m·K) | TYPICAL | CDA Physical Properties: CTE 11.3 µin/(in·°F) (20.34 µm/(m·K)) over range 68-57210°F | 11.3 10^-6 per °F | Copper Development Association Inc. | VERIFIED |
| Specific Heat Capacity | 376.8 J/(kg·K) | TYPICAL | Test Temp: 20 °CCDA Physical Properties: Specific heat 0.09 Btu/(lb·°F) (376.8 J/(kg·K)) | 0.09 Btu/ lb /°F at 68°F | Copper Development Association Inc. | VERIFIED |
| Annealing Temperature Range | 426.7 – 704.4 °C | RANGE | CDA Thermal Treatments: Annealing temperature range 800 - 1300°F (426.7 - 704.4°C) | 800 – 1300 °F | Copper Development Association Inc. | VERIFIED |
C26800 Yellow Brass 66% Electrical Properties
Electrical conductivity and resistivity in their reported units and conditions.
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 | 27 % IACS | TYPICAL | Test Temp: 20 °CCDA Physical Properties: Volume conductivity 27.0 % IACS at 68°F (20°C) | 27.0 % IACS at 68°F | Copper Development Association Inc. | VERIFIED |
C26800 Yellow Brass 66% 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)
103.4 GPa
CDA Physical Properties: Elastic modulus in tension 15000.0 ksi (103.4 GPa)Modulus of Rigidity
38610.6 MPa
CDA Physical Properties: Shear modulus 5600.0 ksi (38610.6 MPa)Machinability Rating
30 %
CDA Fabrication Properties: Rating relative to Free-Cutting Brass (C36000 = 100%).Showing 39 of 39 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 | 1/2 Hard (H02) · 20 °CSource values and qualifiersTensile Strength: 420.6 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 344.7 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 23 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | 420.6 MPa | 344.7 MPa | 23 % | — | — | — | VERIFIED |
| Flat Products | 1/2 Hard (H02)Source values and qualifiersRockwell B Hardness: 70 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 65 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 275.8 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | — | — | — | 275.8 MPa | — | 70 HRB65 HR30T | VERIFIED |
| Flat Products | 1/4 Hard (H01) · 20 °CSource values and qualifiersTensile Strength: 372.3 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 275.8 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 43 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | 372.3 MPa | 275.8 MPa | 43 % | — | — | — | VERIFIED |
| Flat Products | 1/4 Hard (H01)Source values and qualifiersRockwell B Hardness: 55 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 54 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 248.2 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | — | — | — | 248.2 MPa | — | 55 HRB54 HR30T | VERIFIED |
| Flat Products | 1/8 Hard (H00) · 20 °CSource values and qualifiersTensile Strength: 344.7 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 241.3 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 50 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | 344.7 MPa | 241.3 MPa | 50 % | — | — | — | VERIFIED |
| Flat Products | 1/8 Hard (H00)Source values and qualifiersRockwell B Hardness: 50 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 50 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | — | — | — | — | — | 50 HRB50 HR30T | VERIFIED |
| Flat Products | Extra Hard (H06) · 20 °CSource values and qualifiersTensile Strength: 586.1 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 427.5 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 5 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | 586.1 MPa | 427.5 MPa | 5 % | — | — | — | VERIFIED |
| Flat Products | Extra Hard (H06)Source values and qualifiersRockwell B Hardness: 87 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 74 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 310.3 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | — | — | — | 310.3 MPa | — | 87 HRB74 HR30T | VERIFIED |
| Flat Products | Hard (H04) · 20 °CSource values and qualifiersTensile Strength: 510.2 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 413.7 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 8 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | 510.2 MPa | 413.7 MPa | 8 % | — | — | — | VERIFIED |
| Flat Products | Hard (H04)Source values and qualifiersRockwell B Hardness: 80 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 70 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 296.5 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Fatigue Strength: 96.5 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; 10^8 cycles endurance limitCopper Development Association (CDA) — | 0.04 | — | — | — | 296.5 MPa | 96.5 MPa | 80 HRB70 HR30T | VERIFIED |
| Flat Products | Nominal Grain Size 0.015 mm (OS015) · 20 °CSource values and qualifiersTensile Strength: 365.4 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 151.7 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 54 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | 365.4 MPa | 151.7 MPa | 54 % | — | — | — | VERIFIED |
| Flat Products | Nominal Grain Size 0.015 mm (OS015)Source values and qualifiersRockwell F Hardness: 78 HRF (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 43 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | — | — | — | — | — | 78 HRF43 HR30T | VERIFIED |
| Flat Products | Nominal Grain Size 0.025 mm (OS025) · 20 °CSource values and qualifiersTensile Strength: 351.6 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 131 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 55 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | 351.6 MPa | 131 MPa | 55 % | — | — | — | VERIFIED |
| Flat Products | Nominal Grain Size 0.025 mm (OS025)Source values and qualifiersRockwell F Hardness: 72 HRF (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 36 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | — | — | — | — | — | 72 HRF36 HR30T | VERIFIED |
| Flat Products | Nominal Grain Size 0.035 mm (OS035) · 20 °CSource values and qualifiersTensile Strength: 337.8 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 117.2 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 57 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | 337.8 MPa | 117.2 MPa | 57 % | — | — | — | VERIFIED |
| Flat Products | Nominal Grain Size 0.035 mm (OS035)Source values and qualifiersRockwell F Hardness: 68 HRF (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 31 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 234.4 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | — | — | — | 234.4 MPa | — | 68 HRF31 HR30T | VERIFIED |
| Flat Products | Nominal Grain Size 0.050 mm (OS050) · 20 °CSource values and qualifiersTensile Strength: 324.1 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 103.4 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 62 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | 324.1 MPa | 103.4 MPa | 62 % | — | — | — | VERIFIED |
| Flat Products | Nominal Grain Size 0.050 mm (OS050)Source values and qualifiersRockwell F Hardness: 64 HRF (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 26 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | — | — | — | — | — | 64 HRF26 HR30T | VERIFIED |
| Flat Products | Nominal Grain Size 0.070 mm (OS070) · 20 °CSource values and qualifiersTensile Strength: 317.2 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 96.5 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 65 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | 317.2 MPa | 96.5 MPa | 65 % | — | — | — | VERIFIED |
| Flat Products | Nominal Grain Size 0.070 mm (OS070)Source values and qualifiersRockwell F Hardness: 58 HRF (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 15 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 220.6 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Fatigue Strength: 82.7 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; 10^8 cycles endurance limitCopper Development Association (CDA) — | 0.04 | — | — | — | 220.6 MPa | 82.7 MPa | 58 HRF15 HR30T | VERIFIED |
| Flat Products | Spring (H08) · 20 °CSource values and qualifiersTensile Strength: 627.4 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 427.5 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 3 % (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — | 0.04 | 627.4 MPa | 427.5 MPa | 3 % | — | — | — | VERIFIED |
| Flat Products | Spring (H08)Source values and qualifiersRockwell B Hardness: 90 HRB (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Rockwell 30T Hardness: 76 HR30T (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Shear Strength: 324.1 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 inCopper Development Association (CDA) — Fatigue Strength: 137.9 MPa (TYPICAL)Section Size: 0.04; Section Size: 0.04 in; 10^8 cycles endurance limitCopper Development Association (CDA) — | 0.04 | — | — | — | 324.1 MPa | 137.9 MPa | 90 HRB76 HR30T | VERIFIED |
| Rod | 1/8 Hard (H00) · 20 °CSource values and qualifiersTensile Strength: 379.2 MPa (TYPICAL)Section Size: 1; Cold Work: 6%; Section Size: 1 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 275.8 MPa (TYPICAL)Section Size: 1; Cold Work: 6%; Section Size: 1 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 48 % (TYPICAL)Section Size: 1; Cold Work: 6%; Section Size: 1 inCopper Development Association (CDA) — | 1 | 379.2 MPa | 275.8 MPa | 48 % | — | — | — | VERIFIED |
| Rod | 1/8 Hard (H00)Source values and qualifiersRockwell B Hardness: 55 HRB (TYPICAL)Section Size: 1; Cold Work: 6%; Section Size: 1 inCopper Development Association (CDA) — Shear Strength: 248.2 MPa (TYPICAL)Section Size: 1; Cold Work: 6%; Section Size: 1 inCopper Development Association (CDA) — | 1 | — | — | — | 248.2 MPa | — | 55 HRB | VERIFIED |
| Rod | Nominal Grain Size 0.050 mm (OS050) · 20 °CSource values and qualifiersTensile Strength: 330.9 MPa (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 110.3 MPa (TYPICAL)Section Size: 1; Section Size: 1 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 65 % (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — | 1 | 330.9 MPa | 110.3 MPa | 65 % | — | — | — | VERIFIED |
| Rod | Nominal Grain Size 0.050 mm (OS050)Source values and qualifiersRockwell F Hardness: 65 HRF (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — Shear Strength: 234.4 MPa (TYPICAL)Section Size: 1; Section Size: 1 inCopper Development Association (CDA) — | 1 | — | — | — | 234.4 MPa | — | 65 HRF | VERIFIED |
| Wire | 1/2 Hard (H02) · 20 °CSource values and qualifiersTensile Strength: 606.7 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Elongation: 15 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — | 0.08 | 606.7 MPa | — | 15 % | — | — | — | VERIFIED |
| Wire | 1/4 Hard (H01) · 20 °CSource values and qualifiersTensile Strength: 482.6 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Elongation: 20 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — | 0.08 | 482.6 MPa | — | 20 % | — | — | — | VERIFIED |
| Wire | 1/4 Hard (H01)Source values and qualifiersShear Strength: 289.6 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Fatigue Strength: 151.7 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 in; 10^8 cycles endurance limitCopper Development Association (CDA) — | 0.08 | — | — | — | 289.6 MPa | 151.7 MPa | — | VERIFIED |
| Wire | 1/8 Hard (H00) · 20 °CSource values and qualifiersTensile Strength: 399.9 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Elongation: 35 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — | 0.08 | 399.9 MPa | — | 35 % | — | — | — | VERIFIED |
| Wire | 1/8 Hard (H00)Source values and qualifiersShear Strength: 262 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — | 0.08 | — | — | — | 262 MPa | — | — | VERIFIED |
| Wire | Extra Hard (H06) · 20 °CSource values and qualifiersTensile Strength: 827.4 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Elongation: 4 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — | 0.08 | 827.4 MPa | — | 4 % | — | — | — | VERIFIED |
| Wire | Extra Hard (H06)Source values and qualifiersShear Strength: 413.7 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — | 0.08 | — | — | — | 413.7 MPa | — | — | VERIFIED |
| Wire | Hard (H04) · 20 °CSource values and qualifiersTensile Strength: 758.4 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Elongation: 8 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — | 0.08 | 758.4 MPa | — | 8 % | — | — | — | VERIFIED |
| Wire | Hard (H04)Source values and qualifiersShear Strength: 379.2 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — | 0.08 | — | — | — | 379.2 MPa | — | — | VERIFIED |
| Wire | Nominal Grain Size 0.035 mm (OS035) · 20 °CSource values and qualifiersTensile Strength: 344.7 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Elongation: 60 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — | 0.08 | 344.7 MPa | — | 60 % | — | — | — | VERIFIED |
| Wire | Nominal Grain Size 0.035 mm (OS035)Source values and qualifiersShear Strength: 234.4 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — | 0.08 | — | — | — | 234.4 MPa | — | — | VERIFIED |
| Wire | Spring (H08) · 20 °CSource values and qualifiersTensile Strength: 882.5 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Elongation: 3 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — | 0.08 | 882.5 MPa | — | 3 % | — | — | — | VERIFIED |
| Wire | Spring (H08)Source values and qualifiersShear Strength: 413.7 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — | 0.08 | — | — | — | 413.7 MPa | — | — | 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
C26800 Yellow Brass 66% Processing & Fabrication
Machining, joining, forming, and thermal processing ratings cataloged from the cited authoritative technical reference.
Machinability
Machinability rating: 30% relative to free-cutting brass (C36000 = 100%).
Weldability & Joining
Soldering: Excellent; Brazing: Excellent; Oxyacetylene Welding: Good; Gas Shielded Arc Welding: Fair; Coated Metal Arc Welding: Not Recommended; Spot Weld: Good; Seam Weld: Not Recommended; Butt Weld: Good
Heat Treatment & Working Ranges
Annealing temperature range: 426.7°C to 704.4°C (800°F - 1300°F).
Forming & Cold Working
Capacity for Being Cold Worked: Excellent. Capacity for Being Hot Formed: Poor.
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 C26800 Yellow Brass 66% states: Machinability rating: 30% relative to free-cutting brass (C36000 = 100%). A relevant hardness example is Rockwell B Hardness: 70 HRB (typical; 1/2 Hard (H02), H02, Flat Products, 0.04). 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: Excellent; Brazing: Excellent; Oxyacetylene Welding: Good; Gas Shielded Arc Welding: Fair; Coated Metal Arc Welding: Not Recommended; Spot Weld: Good; Seam Weld: Not Recommended; Butt Weld: Good The first cataloged strength example is Tensile Strength: 420.6 MPa (typical; 1/2 Hard (H02), H02, Flat Products, 0.04; 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: 115.96 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 Cu 64–68.5 wt%, Pb maximum 0.09 wt%. Chemistry documents identity; it does not establish fluid compatibility.
Selection trade-offs & applications
Use UNS C26800, COMMERCIAL Yellow Brass 66%, CDA Alloy 268 to identify the candidate, then specify the product form and delivered condition separately. The catalog lists Air Pressure Conveyer Systems: Forming Characteristics as an application example. The related candidate C26000 Cartridge Brass 70/30 is linked for comparison; its commonly compared 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)
C26800 Yellow Brass 66% Equivalent & Comparable Grades
Comparable Grades & Cross-References: Carefully classified cross-reference relationships for C26800 Yellow Brass 66%. Comparable does not mean equivalent.
Scroll horizontally for relationship classifications & comparisons
| Related Material | Family | Relationship Classification | Metallurgical Notes & Differences | Status | Action |
|---|---|---|---|---|---|
| C26000 Cartridge Brass 70/30 | Copper Alloys | Commonly Compared | C26800 Yellow Brass 66% (66Cu-34Zn) offers commercial economy for sheet stamping and spinning, whereas C26000 (70Cu-30Zn) provides higher cold ductility for severe deep drawing.Materials serve different design priorities (e.g. higher strength vs superior corrosion resistance or cost). | VERIFIED | |
| C28000 Muntz Metal 60/40 | Copper Alloys | Commonly Compared | C26800 is a single-phase alpha brass optimized for cold working, while C28000 is a duplex alpha-beta brass optimized for hot working and forging.Materials serve different design priorities (e.g. higher strength vs superior corrosion resistance or cost). | VERIFIED | |
| C27000 Yellow Brass 65% | Copper Alloys | Approximate Equivalent | C26800 (66/34) and C27000 (65/35) are alpha yellow brasses with distinct product forms and cold-work responses; they are not direct interchangeable substitutes.Engineering substitution review required. Design calculations must verify temper, formability, and corrosion limits before specifying as a direct replacement. | VERIFIED |
Yellow Brass Alloy Family
Copper alloys sharing common alloying formulations and metallurgical classifications under the Yellow Brass branch.
C26800Current Grade
C26800 Yellow Brass 66%
Sources
Sources & Provenance Trail: Authoritative reference publications, standards specifications, and data registers cited across this material record.
Copper Development Association Inc.CDA Alloy C26800 Property & Specification Profile
AUTHORITATIVE BODY
Copper Development Association authoritative technical reference profile for C26800 Yellow Brass 66%.
Issuing Body: Copper Development Association (CDA)View Source Record ↗
Copper Development Association Inc.CDA UNS Standard Designations Register (C26800)
AUTHORITATIVE BODY
Unified Numbering System (UNS) designation registration register confirming active C26800 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.