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) | CZ121 |
| 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 lead-free 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 CZ121 (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.
Brassland machines CW614N into brass turned parts and CNC machined components to your drawing in Jamnagar, India, including precision turned brass components on 28+ Swiss-type lathes, with an EN 10204 3.1 certificate on every shipment.