Weight %. The reduced Pb window trades some machinability for genuine post-machining formability.
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Copper | Cu | 59.0 | 62.0 | 60.5 |
| Zinc | Zn | Balance | ~38 | |
| Lead | Pb | 1.0 | 2.0 | 1.5 |
| Iron | Fe | — | 0.30 | 0.08 |
| Nickel | Ni | — | 0.30 | 0.05 |
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength (Rm) | R360 | 360–480 | MPa |
| Proof Stress (Rp0.2) | R360 | ≥140 | MPa |
| Elongation (A) | R360 | ≥22 | % |
| Hardness | R360 typical | 90–115 | HB |
| Machinability | vs C36000 = 100 | ~65% | — |
| Density | — | 8.50 | g/cm³ |
| Thermal Conductivity | — | ~125 | W/(m·K) |
| Melting Range | solidus–liquidus | 900–930 | °C |
| Standard | Designation |
|---|---|
| EN (Europe) | CW612N / CuZn38Pb1.5 |
| UNS / ASTM (USA) | C37700 (forging twin) · C35000 (close) |
| BS (UK legacy) | CZ131 |
| DIN (Germany) | CuZn38Pb1.5 |
| ISO | CuZn38Pb1.5 |
CW612N (CuZn38Pb1.5) is a low-lead free-machining brass per EN 12164, rated around 65% machinability with noticeably better cold-work ductility than CW614N. It suits turned parts that also need swaging, crimping, staking or light bending after machining.
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. Its lower lead content (~1.5%) also positions it well if exemption thresholds tighten.
CW614N machines faster (95% rating) but is brittle under cold deformation. CW612N trades some machinability for ductility — pick it when the part is crimped, flared or staked in assembly. If the part is purely turned with no forming, CW614N remains the more economical choice.
The nearest equivalents are C35000/C34000 medium-leaded brasses (US, ASTM) and former UK designation CZ131. Composition is specified in EN 12164; Brassland supplies EN 10204 Type 3.1 mill certificates with every lot.
Turned, then crimped, flared or staked — 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.