C69300 Eco Brass hollow bars consist of silicon brass that has no added lead (maximum 0.09%). The alloy finds applications in machining water fittings and valve bodies. It is also referred to as UNS C69300, EN CW724R, and CuZn21Si3P. Silicon and phosphorus add strength, machinability, and corrosion resistance to the alloy without use of lead for chip management. The alloy has less than 0.25% lead content by weighted average, which is below the US requirement of 0.25% for wetted surfaces and needs its own certification after machining. It comes as an extruded or bored hollow bar and can be automatically turned and precisely machined. USA Piping Solution supplies C69300 hollow bars to your sizes. Send the OD, bore, length, and quantity to request a quote.
Specifications of C69300 Eco Brass Hollow Bars
|
Parameter |
Specification & Commercial Details |
|---|---|
|
Product Name |
C69300 Eco Brass Hollow Bars / Lead-Free Silicon Brass Bored Stock |
|
Material Designations |
UNS C69300 (CDA) | CW724R (EN Numeric) | CuZn21Si3P (EN Chemical) | Eco Brass type |
|
Material Class |
Lead-Free High-Strength Silicon Brass (-phase structure) |
|
Governing Standards (Baseline) |
ASTM B371 / B371M (copper-zinc-silicon alloy rod) EN 12164 (European free-machining rod standard) |
|
Governing Standards (Hollow Stock) |
EN 12168 (Hollow rod for free-machining applications) Custom mill-bored stock produced to customer dimensional specifications |
|
Corrosion Protection |
Intrinsic Dezincification Resistance (DZR) via low effective zinc content (~21% Zn) + silicon/phosphorus matrix; Verified to ISO 6509-1 on request |
|
Lead Classification & Compliance |
Lead-free silicon brass: Pb 0.09% max (ASTM B371) / 0.10% max (EN CW724R) Meets the 0.25% weighted-average lead limit (SDWA) and the 0.1% RoHS lead limit on composition; finished parts need their own approvals |
|
Product Forms |
Round Hollow Bars, Hexagonal Hollow Bars, Precision Bored Stock, Turned Billets |
|
Manufacturing Processes |
Hot Extrusion, Cold Drawing, Direct Mechanical Gun-Drilling / Boring |
|
Supply Tempers |
ASTM B371 H02 (half-hard), as extruded, cold drawn; EN 12164 R600 / R670 hard-drawn tempers |
|
Dimensional Scope |
Outside Diameter (OD), Bore (ID), Wall Thickness, and Length (dimensional ranges held to be confirmed by mill) |
|
Length Options |
Standard random mill lengths (3 m) or precision cut-to-length billets |
|
Surface Finish |
Smooth Machined, Bright Turned, As-Drawn, or Clean Extruded |
|
Primary Applications |
Potable water valve bodies, PEX crimp fittings, commercial faucet stems, water meter housings, manifold blocks, and high-strength automotive fluid sensors |
|
Quality & Certification |
EN 10204 3.1 Material Test Certificate (MTC), Spectrographic Analysis, Heat Traceability, ISO 6509-1 Corrosion Test Report on request |
Applications and Industrial Uses of C69300 Eco Brass Hollow Bars
- Drinking Water Plumbing Fittings
- Water Meter Components
- Valve Bodies and Components
- Faucet and Tapware Fittings
- Fluid Control Components
- Hydraulic Fittings and Connectors
- Pneumatic Fittings
- Precision CNC-Machined Components
Frequently Asked Questions
1. What are C69300 Eco Brass hollow bars?
C69300 Eco Brass hollow bars are high-strength silicon brass bars used for precision-machined fittings, valve bodies, and fluid control components.
2. Is C69300 the same as CW724R and CuZn21Si3P?
Yes. C69300 is the UNS designation, CW724R is the European grade code, and CuZn21Si3P is the corresponding chemical designation for this silicon brass alloy.
3. What is the difference between C69300 and CW602N brass?
C69300 is a silicon brass designed for low-lead applications, while CW602N is a leaded arsenical brass that provides dezincification resistance through arsenic additions and suitable heat treatment.
4. Is C69300 Eco Brass lead-free?
C69300 is commonly classified as lead-free brass because its lead content is limited to a low level. Drinking-water compliance must still be confirmed against applicable regulations and product certifications.
5. How machinable is C69300 Eco Brass?
C69300 offers good machinability for lead-free brass, with silicon-rich phases helping chip formation during CNC turning and precision machining.