CZ121 brass tube is a free-machining brass tube with a lead content of 3%, is EN CW614N, CuZn39Pb3, suitable for precision components that need to be cut quickly, complete and stable. This copper-zinc alloy is typically 2.5% to 3.5% lead, and is used for turning, drilling and threading operations. It has a structure of alpha and beta brass and has excellent machinability and low cold forming ability. Use CZ121 for turned, drilled and threaded parts (not bent or swaged) due to the problems with cold formability. USA Piping Solution has the ability to supply CZ121 brass tube and hollow bar with heat traceability and a EN 10204 3.1 Mill Test Certificate.
Specifications of Cz121 Lead Free Brass Tubes
| Specification Details | Technical Basis & Parameters |
|---|---|
| BS Designation | CZ121 (BS 2874 / BS 2870) |
| EN Numerical Code | EN CW614N |
| EN Chemical Formula | CuZn39Pb3 |
| UNS Equivalent | UNS C38500 |
| Manufacturing Standards | EN 12168 (Hollow bar for machining), EN 12164, ASTM B16 / B453 |
| Product Forms | Seamless round tube, heavy-wall hollow bar, custom extruded profiles |
| Copper (Cu) | 57.00% – 59.00% |
| Lead (Pb) | 2.50% – 3.50% (Deliberate addition for chip breaking) |
| Iron (Fe) | 0.30% Max |
| Zinc (Zn) | Balance (Nominal ~39.0%) |
| Tensile Strength (Rm) | 360 – 500 MPa |
| Yield Strength (Rp0.2) | 220 – 350 MPa |
| Elongation (A5) | 5% – 20% (Varies by wall thickness & drawing temper) |
| Hardness | 90 – 160 HB (Brinell) |
| Density | 8.40g/cm3 (0.303lb/in3) |
| Coefficient of Thermal Expansion | 20.910-6/K (20to200°C) |
| Machinability Index | 100%(Industry benchmark for free-machining brass) |
| Hot Working Temperature | 625 °C – 725 °C (Hot formability: Excellent) |
| Cold Formability | Poor (Prone to cracking under bending/swaging due to lead globules) |
| Annealing Temperature | 450 °C – 600 °C |
| Stress Relieving Temp. | 250 °C – 350 °C |
| Joining Suitability | Soldering: Excellent | Brazing: Good | Welding: Not Recommended |
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Applications and Industrial Uses of Cz121 Lead Free Brass Tubes
- CNC-Turned Brass Components
- Pneumatic Valve Bodies
- Hydraulic Valve Components
- Instrumentation Connector Bodies
- Brass Threaded Inserts
- Precision Machined Bushings
- Pneumatic Fitting Components
- Electrical Terminal Components
Frequently Asked Questions
What are CZ121 lead-free brass tubes?
CZ121 tubes are free-machining brass tubes containing 2.5% to 3.5% lead. They are not lead-free brass products.
Is CZ121 brass lead free?
No. CZ121 contains lead to improve machinability and does not meet requirements for lead-free plumbing materials.
What is the composition of CZ121 brass tubes?
CZ121 typically contains around 58% copper, 39% zinc, and 2.5% to 3.5% lead.
Which standard covers CZ121 brass?
CZ121 is a British designation associated with EN CW614N and UNS C38500. The applicable product standard should be confirmed for the supplied tube or hollow section.
What are CZ121 brass tubes used for?
CZ121 is primarily selected for precision-machined components that require efficient cutting and a good surface finish.
Can CZ121 brass tubes be used for drinking water?
No. CZ121's high lead content makes it unsuitable for drinking water applications requiring lead-free materials.
What is the difference between CZ121 and lead-free brass?
CZ121 contains deliberately added lead for better machinability, while lead-free brass grades are designed to meet applicable low-lead requirements.
What is a suitable alternative to CZ121 lead-free brass tubes?
For lead-free machined parts, ask us about silicon brass such as CuZn21Si3P (CW724R), which is machinable and meets low-lead limits. Confirm the grade and the certification needed for your application.
EN 10204 3.1 Mill Test Certificates with heat traceability.
Send your specification to USA Piping Solution for a same-day quote with confirmed lead times.
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