CW724R DZR Eco Brass Hollow Rods

CW724R DZR Eco Brass Hollow Rods are precision, corrosion resistant and easily machinable lead-free silicon Brass machining stock for precision parts. It is also referred to as CuZn21Si3P or UNS C69300 and is composed of 75 to 77% copper, 2.7 to 3.5% silicon and a max of 0.10% lead. It is resistant to dezincification, and can be used for drinking water fittings, valves, plumbing and sanitary hardware. These hollow rods are manufactured to comply with EN 12168 requirements and will provide high-speed cutting, boring and drilling without the need for lead to control chips. USA Piping Solution offers the industrial pipe and component making hollow rods, CW724R DZR Eco Brass. Specifications and documentation can be provided upon request and provide the OD, bore, length and quantity to get a quote.

Specifications of CW724R DZR Eco Brass Hollow Rods

Standard / Specification	Product Scope & Material Coverage
EN Designations	CW724R (EN Number), CuZn21Si3P (EN Symbol), UNS C69300 (US Equivalent)
EN 12164:2024	Copper and copper alloys — Rod for free machining
EN 12165:2024	Copper and copper alloys — Wrought and unwrought forging stock (rods over 80 mm supplied as manufactured)
EN 12168	Copper and copper alloys — Hollow rod for free machining
ASTM B371 / B371M	US specification for copper-zinc-silicon alloy rod (C69300)
ISO 6509-1	Corrosion of metals and alloys — Determination of dezincification resistance of brass
Hollow Rod Dimensions	Outer Diameter (OD), Bore (ID), Wall Thickness, Length, Temper Condition

Chemical Compositions of CW724R DZR Eco Brass Hollow Rods

Element	EN 12164 CW724R (%)
Copper (Cu)	75.0 to 77.0
Silicon (Si)	2.7 to 3.5
Phosphorus (P)	0.02 to 0.10
Lead (Pb)	0.10 max
Iron (Fe)	0.3 max
Tin (Sn)	0.3 max
Nickel (Ni)	0.2 max
Aluminium (Al)	0.05 max
Manganese (Mn)	0.05 max
Other Elements (Total)	0.2 max
Zinc (Zn)	Remainder

Mechanical Properties of CW724R DZR Eco Brass Hollow Rods

Temper Condition	Diameter Size Range	Tensile Strength Rm (MPa min)	Proof Strength Rp0.2 (MPa)	Elongation A (min %)	Hardness Range (HBW)
R500	Ø6 mm to 80 mm	500	450 max	15%	H130 (130 to 180 HBW)
R600	Ø10 mm to 40 mm	600	300 min	12%	H150 (150 to 220 HBW)
R670	Ø2 mm to 20 mm	670	400 min	10% (A) / 9% (A11.3)	H170 (170 HBW min)

CW724R DZR Eco Brass Hollow Rods Physical Properties

Physical Property	Metric Value	Imperial Value	Reference Basis & Technical Notes
Density at 20 °C	8.25 to 8.30 g/cm³	0.298 to 0.300 lbs/in³	Published EN and CDA reference data
Electrical Conductivity	7.8 to 8.0 %IACS	4.5 to 4.6 MS/m	Published EN and CDA reference data
Thermal Conductivity	33 to 38 W/(m·K)	19 to 22 Btu/(hr·ft·°F)	Published EN and CDA reference data
Modulus of Elasticity (Young's)	100 to 105 GPa	14,500 to 15,200 ksi	Published EN and CDA reference data
Melting Range (Solidus / Liquidus)	855 °C to 880 °C	1571 °F to 1616 °F	Published EN and CDA reference data
Annealing Temperature	530 °C to 650 °C	986 °F to 1202 °F	To protect DZR, keep hot work and annealing at or below 580 °C (confirm with mill)

Size Available of CW724R DZR Eco Brass Hollow Rods

Form / Profile	Outside Diameter (OD)	Inside Diameter (Bore ID)	Wall Thickness	Supply Length	Delivery Condition
Hollow Round Rods	20 mm to 120 mm (0.79 to 4.72 in)	10 mm to 90 mm (0.39 to 3.54 in)	3 mm to 25 mm	3 m to 4 m (Cut lengths available)	As-Extruded / Cold Drawn
Hollow Hexagonal Rods	20 mm to 100 mm across flats	10 mm to 75 mm (Custom bore)	3 mm to 20 mm	3 m to 4 m (Cut lengths available)	As-Extruded / Cold Drawn
Hollow Square Rods	20 mm to 80 mm across flats	10 mm to 60 mm (Custom bore)	3 mm to 20 mm	3 m to 4 m (Cut lengths available)	As-Extruded / Cold Drawn

Applications and Industrial Uses of CW724R DZR Eco Brass Hollow Rods

Drinking Water Fittings
Plumbing Valves and Connectors
Sanitary Faucets and Tap Components
Water Meter Components
Thermostatic Mixing Valves
Plumbing Manifolds and Distribution Blocks
Precision-Machined Valve Bodies
Water Supply System Components

Frequently Asked Questions

1. What are CW724R DZR Eco Brass hollow rods?

CW724R hollow rods are lead-free silicon brass products offering good machinability and dezincification resistance for plumbing and water-system components.

2. Is CW724R the same as CuZn21Si3P and C69300?

Yes. CW724R, CuZn21Si3P, and UNS C69300 are designations associated with this silicon brass alloy.

3. Is CW724R lead-free?

CW724R contains a maximum of 0.10% lead, making it a low-lead alloy commonly classified as lead-free.

4. Is CW724R dezincification resistant, and how is it proved?

Yes. Its silicon-based alloy structure provides dezincification resistance, which can be verified through ISO 6509-1 testing.

5. Is CW724R approved for drinking water?

CW724R is listed on the European positive list for drinking-water contact materials (EUPL entry 1658, subject to verification). Finished-component approvals such as ACS, WRAS, and KIWA depend on the manufacturer and applicable certification requirements.

6. Which EN standard covers CW724R hollow rod?

EN 12168 covers hollow rods for free machining. EN 12164 covers solid rods.

7. What are the CW724R tempers?

EN 12164 rod tempers include R500 (Ø6 to 80 mm, minimum tensile strength 500 MPa), R600 (Ø10 to 40 mm, minimum 600 MPa), and R670 (Ø2 to 20 mm, minimum 670 MPa). Hollow rod values follow EN 12168 and the mill certificate.

8. How does CW724R differ from CW602N?

CW724R is a silicon-based, low-lead brass, while CW602N contains more lead and uses arsenic to improve dezincification resistance.

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