VERIFIED(Source-Verified)

C27000 Yellow Brass 65%

Primary Designation:UNS C27000

Aliases:

Yellow Brass 65%Wire BrassC27000

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

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Data Completeness:4 composition elements and 110 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°C

Composition Excerpt

Cu 63–68.5 wt%Copper (range)

Standard Elemental Basis: RANGE

Engineering Summary

UNS C27000 Yellow Brass 65% (63.0-68.5% Cu, Zn Remainder) is an alpha brass optimized for wire drawing, heading, and spring pins. It provides 27% IACS conductivity, high cold ductility, and good tensile strength across drawn tempers.

C27000 Yellow Brass 65% Documented Applications

›Architecture: Grillwork
›Automotive: Radiator Cores
›Bead Chain: Corrosion Resistance
›Bead Chain: Forming Characteristics
›Bead Chain: Mechanical Properties
›Builders Hardware: Finish Hardware
›Chain: Appearance
›Chain: Corrosion Resistance
›Chain: Forming Characteristics
›Chain: Mechanical Properties
›Electrical: Flashlight Shells
›Eyelets: Corrosion Resistance

Recognized Aliases

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

Yellow Brass 65%Wire BrassC27000

C27000 Yellow Brass 65% 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

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System	Identifier	Standard System Name	Classification Notes & Provenance
UNSPRIMARY	C27000	Unified Numbering System	Unified Numbering System standard designation for copper alloys (CDA / SAE / ASTM)Ref: CDA UNS Standard Designations Register (C27000)
CDA	Alloy 270	Copper Development Association Alloy Number	CDA three-digit legacy designationRef: CDA UNS Standard Designations Register (C27000)

Recognized Commercial Aliases & Trade NamesCOMMON ALIAS

3 Listed

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Recognized Name / Alias	Classification	Technical Usage & Context
Yellow Brass 65%	Standard Commercial Name	CDA Standard Commercial Name
Wire Brass	Commercial Alias	Colloquial or commercial industry synonym
C27000	Commercial Alias	Colloquial or commercial industry synonym

Applicable Specifications & Product Form ReferencesSPECIFICATION REFERENCE

12 Applicable Standards

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Standards Body	Specification Code	Specification Title / Scope	Relationship Type
ASTM	ASTM F468	NONFERROUS BOLTS, HEX CAP SCREWS, AND STUDS FOR GENERAL USE	Specification Reference
ASTM	ASTM F467	NONFERROUS NUTS FOR GENERAL USE	Specification Reference
SAE	SAE J461	WROUGHT AND CAST COPPER ALLOYS	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 B135	Tube, Seamless	Specification Reference
ASTM	ASTM B135/B135M	Seamless Brass Tube	Specification Reference
ASME	ASME SB135	SEAMLESS BRASS TUBE	Specification Reference
ASTM	ASTM B587	WELDED BRASS TUBE	Specification Reference
AMS	AMS 4712	BRASS WIRE, ANNEALED	Specification Reference
ASTM	ASTM B134/B134M	BRASS WIRE	Specification Reference
AMS	AMS 4710	BRASS WIRE, TINNED, ANNEALED	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.

C27000 Yellow Brass 65% Chemical Composition

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

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Element	Symbol	Atomic No.	Semantic Basis	Specified Value	Unit	Metallurgical Notes & Qualification	Data Status
Copper	Cu	29	RANGE	63.00 – 68.50	wt%	CDA chemical composition specification limits for C27000: 63.0 - 68.5 wt%.Ref: Copper Development Association (CDA)	VERIFIED
Lead	Pb	82	MAXIMUM	≤ 0.09	wt%	CDA chemical composition specification limits for C27000: 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	≤ 0.07	wt%	CDA chemical composition specification limits for C27000: max 0.07 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:

C27000 Yellow Brass 65% Physical Properties

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

1 Parameters

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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

C27000 Yellow Brass 65% Thermal & Thermodynamic Properties

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

6 Parameters

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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

C27000 Yellow Brass 65% Electrical Properties

Electrical conductivity and resistivity in their reported units and conditions.

1 Parameters

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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

C27000 Yellow Brass 65% 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%).

Product Form:

Temper / Condition:

Showing 39 of 39 conditions

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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 °C Source values and qualifiers Tensile 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) — H02	0.04	420.6 MPa	344.7 MPa	23 %	—	—	—	VERIFIED
Flat Products	1/2 Hard (H02) Source values and qualifiers Rockwell 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) — H02	0.04	—	—	—	275.8 MPa	—	70 HRB65 HR30T	VERIFIED
Flat Products	1/4 Hard (H01) · 20 °C Source values and qualifiers Tensile 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) — H01	0.04	372.3 MPa	275.8 MPa	43 %	—	—	—	VERIFIED
Flat Products	1/4 Hard (H01) Source values and qualifiers Rockwell 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) — H01	0.04	—	—	—	248.2 MPa	—	55 HRB54 HR30T	VERIFIED
Flat Products	1/8 Hard (H00) · 20 °C Source values and qualifiers Tensile 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) — H00	0.04	344.7 MPa	241.3 MPa	50 %	—	—	—	VERIFIED
Flat Products	1/8 Hard (H00) Source values and qualifiers Rockwell 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) — H00	0.04	—	—	—	—	—	50 HRB50 HR30T	VERIFIED
Flat Products	Extra Hard (H06) · 20 °C Source values and qualifiers Tensile 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) — H06	0.04	586.1 MPa	427.5 MPa	5 %	—	—	—	VERIFIED
Flat Products	Extra Hard (H06) Source values and qualifiers Rockwell 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) — H06	0.04	—	—	—	310.3 MPa	—	87 HRB74 HR30T	VERIFIED
Flat Products	Hard (H04) · 20 °C Source values and qualifiers Tensile 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) — H04	0.04	510.2 MPa	413.7 MPa	8 %	—	—	—	VERIFIED
Flat Products	Hard (H04) Source values and qualifiers Rockwell 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) — H04	0.04	—	—	—	296.5 MPa	96.5 MPa	80 HRB70 HR30T	VERIFIED
Flat Products	Nominal Grain Size 0.015 mm (OS015) · 20 °C Source values and qualifiers Tensile 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) — OS015	0.04	365.4 MPa	151.7 MPa	54 %	—	—	—	VERIFIED
Flat Products	Nominal Grain Size 0.015 mm (OS015) Source values and qualifiers Rockwell 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) — OS015	0.04	—	—	—	—	—	78 HRF43 HR30T	VERIFIED
Flat Products	Nominal Grain Size 0.025 mm (OS025) · 20 °C Source values and qualifiers Tensile 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) — OS025	0.04	351.6 MPa	131 MPa	55 %	—	—	—	VERIFIED
Flat Products	Nominal Grain Size 0.025 mm (OS025) Source values and qualifiers Rockwell 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) — OS025	0.04	—	—	—	—	—	72 HRF36 HR30T	VERIFIED
Flat Products	Nominal Grain Size 0.035 mm (OS035) · 20 °C Source values and qualifiers Tensile 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) — OS035	0.04	337.8 MPa	117.2 MPa	57 %	—	—	—	VERIFIED
Flat Products	Nominal Grain Size 0.035 mm (OS035) Source values and qualifiers Rockwell 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) — OS035	0.04	—	—	—	234.4 MPa	—	68 HRF31 HR30T	VERIFIED
Flat Products	Nominal Grain Size 0.050 mm (OS050) · 20 °C Source values and qualifiers Tensile 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) — OS050	0.04	324.1 MPa	103.4 MPa	62 %	—	—	—	VERIFIED
Flat Products	Nominal Grain Size 0.050 mm (OS050) Source values and qualifiers Rockwell 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) — OS050	0.04	—	—	—	—	—	64 HRF26 HR30T	VERIFIED
Flat Products	Nominal Grain Size 0.070 mm (OS070) · 20 °C Source values and qualifiers Tensile 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) — Tensile 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) — OS070	0.04	317.2 MPa	96.5 MPa	65 %	—	—	—	VERIFIED
Flat Products	Nominal Grain Size 0.070 mm (OS070) Source values and qualifiers Rockwell 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) — OS070	0.04	—	—	—	220.6 MPa	82.7 MPa	58 HRF15 HR30T	VERIFIED
Flat Products	Spring (H08) · 20 °C Source values and qualifiers Tensile 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) — H08	0.04	627.4 MPa	427.5 MPa	3 %	—	—	—	VERIFIED
Flat Products	Spring (H08) Source values and qualifiers Rockwell 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) — H08	0.04	—	—	—	324.1 MPa	137.9 MPa	90 HRB76 HR30T	VERIFIED
Rod	1/8 Hard (H00) · 20 °C Source values and qualifiers Tensile 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) — H00	1	379.2 MPa	275.8 MPa	48 %	—	—	—	VERIFIED
Rod	1/8 Hard (H00) Source values and qualifiers Rockwell 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) — H00	1	—	—	—	248.2 MPa	—	55 HRB	VERIFIED
Rod	Nominal Grain Size 0.050 mm (OS050) · 20 °C Source values and qualifiers Tensile 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) — OS050	1	330.9 MPa	110.3 MPa	65 %	—	—	—	VERIFIED
Rod	Nominal Grain Size 0.050 mm (OS050) Source values and qualifiers Rockwell 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) — OS050	1	—	—	—	234.4 MPa	—	65 HRF	VERIFIED
Wire	1/2 Hard (H02) · 20 °C Source values and qualifiers Tensile 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) — H02	0.08	606.7 MPa	—	15 %	—	—	—	VERIFIED
Wire	1/4 Hard (H01) · 20 °C Source values and qualifiers Tensile Strength: 482.6 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — Yield Strength (0.5% Ext): 393 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 in; Yield strength at 0.5% extension under loadCopper Development Association (CDA) — Elongation: 20 % (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H01	0.08	482.6 MPa	393 MPa	20 %	—	—	—	VERIFIED
Wire	1/4 Hard (H01) Source values and qualifiers Fatigue Strength: 151.7 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 in; 10^8 cycles endurance limitCopper Development Association (CDA) — H01	0.08	—	—	—	—	151.7 MPa	—	VERIFIED
Wire	1/8 Hard (H00) · 20 °C Source values and qualifiers Tensile 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) — H00	0.08	399.9 MPa	—	35 %	—	—	—	VERIFIED
Wire	1/8 Hard (H00) Source values and qualifiers Shear Strength: 262 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H00	0.08	—	—	—	262 MPa	—	—	VERIFIED
Wire	Extra Hard (H06) · 20 °C Source values and qualifiers Tensile 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) — H06	0.08	827.4 MPa	—	4 %	—	—	—	VERIFIED
Wire	Extra Hard (H06) Source values and qualifiers Shear Strength: 413.7 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H06	0.08	—	—	—	413.7 MPa	—	—	VERIFIED
Wire	Hard (H04) · 20 °C Source values and qualifiers Tensile 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) — H04	0.08	758.4 MPa	—	8 %	—	—	—	VERIFIED
Wire	Hard (H04) Source values and qualifiers Shear Strength: 379.2 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H04	0.08	—	—	—	379.2 MPa	—	—	VERIFIED
Wire	Nominal Grain Size 0.035 mm (OS035) · 20 °C Source values and qualifiers Tensile 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) — OS035	0.08	344.7 MPa	—	60 %	—	—	—	VERIFIED
Wire	Nominal Grain Size 0.035 mm (OS035) Source values and qualifiers Shear Strength: 234.4 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — OS035	0.08	—	—	—	234.4 MPa	—	—	VERIFIED
Wire	Spring (H08) · 20 °C Source values and qualifiers Tensile 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) — H08	0.08	882.5 MPa	—	3 %	—	—	—	VERIFIED
Wire	Spring (H08) Source values and qualifiers Shear Strength: 413.7 MPa (TYPICAL)Section Size: 0.08; Section Size: 0.08 inCopper Development Association (CDA) — H08	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

C27000 Yellow Brass 65% Processing & Fabrication

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

Source: Copper Development Association (CDA)

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 C27000 Yellow Brass 65% 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 63–68.5 wt%, Pb maximum 0.09 wt%. Chemistry documents identity; it does not establish fluid compatibility.

Selection trade-offs & applications

Use UNS C27000, COMMERCIAL Yellow Brass 65%, CDA Alloy 270 to identify the candidate, then specify the product form and delivered condition separately. The catalog lists Architecture: Grillwork as an application example. The related candidate C26800 Yellow Brass 66% is linked for comparison; its approximate 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)

C27000 Yellow Brass 65% Equivalent & Comparable Grades

Comparable Grades & Cross-References: Carefully classified cross-reference relationships for C27000 Yellow Brass 65%. Comparable does not mean equivalent.

Scroll horizontally for relationship classifications & comparisons

Related Material	Family	Relationship Classification	Metallurgical Notes & Differences	Status	Action
C26800 Yellow Brass 66%	Copper Alloys	Approximate Equivalent	C27000 (65/35) is the standard wire and heading brass, while C26800 (66/34) is flat-rolled sheet brass; substitution requires engineering review of cold-heading versus drawing characteristics.Engineering substitution review required. Design calculations must verify temper, formability, and corrosion limits before specifying as a direct replacement.	VERIFIED
C27200 Yellow Brass 63%	Copper Alloys	Approximate Equivalent	Both are alpha yellow brasses; C27000 has 63.0-68.5% Cu for wire, whereas C27200 has 62.0-65.0% Cu for drawn tubing and fasteners; not directly interchangeable.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.

4 Adjacent Grades

C26800

C26800 Yellow Brass 66%

View Grade →

C27000Current Grade

C27000 Yellow Brass 65%

C27200

C27200 Yellow Brass 63%

View Grade →

C28000

C28000 Muntz Metal 60/40

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 C27000 Property & Specification Profile

AUTHORITATIVE BODY

Copper Development Association authoritative technical reference profile for C27000 Yellow Brass 65%.

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

Copper Development Association Inc.CDA UNS Standard Designations Register (C27000)

AUTHORITATIVE BODY

Unified Numbering System (UNS) designation registration register confirming active C27000 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.