Weight %. Highest standard Pb content in EN brass grades — maximum lubrication during cutting, finest surface finishes.
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Copper | Cu | 57.0 | 59.0 | 58.0 |
| Zinc | Zn | Balance | ~38.5 | |
| Lead | Pb | 2.5 | 3.5 | 3.0 |
| Iron | Fe | — | 0.30 | 0.10 |
| Nickel | Ni | — | 0.30 | 0.05 |
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength (Rm) | R360 | 360–470 | MPa |
| Tensile Strength (Rm) | R430 | 430–530 | MPa |
| Proof Stress (Rp0.2) | R360 | ≥130 | MPa |
| Elongation (A) | R360 | ≥15 | % |
| Hardness | R360 typical | 90–110 | HB |
| Machinability | vs C36000 = 100 | ~100% | — |
| Density | — | 8.50 | g/cm³ |
| Thermal Conductivity | — | ~120 | W/(m·K) |
| Melting Range | solidus–liquidus | 890–920 | °C |
| Standard | Designation |
|---|---|
| EN (Europe) | CW614N / CuZn39Pb3 |
| UNS / ASTM (USA) | C36000 — Free-Cutting Brass |
| BS (UK legacy) | CZ124 |
| DIN (Germany) | CuZn39Pb3 / Ms58 |
| JIS (Japan) | C3604 (close) |
| ISO | CuZn39Pb3 |
CW614N (CuZn39Pb3) is the highest-lead free-machining brass in EN 12164, the EN twin of the C36000 benchmark, rated ~100% machinability. The lead acts as a chip-breaker, making it the first choice for high-volume CNC and Swiss-turned parts — inserts, terminals, standoffs, valve components — where cycle time and surface finish matter most.
Yes, under RoHS Annex III Exemption 6(c), which permits up to 4% lead in copper alloys and is currently valid to 30 June 2027. For applications that must be lead-free outright — such as US/EU potable water wetted parts — consider CW724R or C6802 silicon brass instead.
CW614N is optimised for bar turning: more lead, the best chip-breaking, supplied as drawn rod per EN 12164. CW617N (CuZn40Pb2) has a higher zinc content that gives excellent hot-working, so it is the standard grade for hot-forged and stamped parts that are then machined. If the part is fully machined from rod, choose CW614N; if it starts as a forging, choose CW617N.
The closest equivalents are C36000 free-cutting brass (US, ASTM) and CZ124 (former UK BS designation). Composition is specified in EN 12164; Brassland supplies parts with EN 10204 Type 3.1 mill certificates confirming the alloy lot.
The EN free-machining benchmark, turned to your drawing. ISO 9001:2015. Quote within 24 hours.
Request a QuoteComposition ranges, mechanical properties, machinability ratings and regulatory data on this page are cross-referenced against the publishers below. Tolerances and minimum values are taken from the relevant published standard at the time of writing — for procurement specification, always reference the current published edition.
Last reviewed: June 2026. EN/ISO/ASTM standards are updated periodically. This datasheet reflects the editions listed; for safety-critical or contract-critical applications, always verify against the current published edition of the standard. For project-specific deviations or supplier-specific composition windows, request a Type 3.1 mill certificate (EN 10204) with your order.