Weight %. The reduced Pb window trades some machinability for genuine post-machining formability.
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Copper | Cu | 59.0 | 60.0 | 59.5 |
| Zinc | Zn | Balance | ~39 | |
| Lead | Pb | 1.6 | 2.5 | 2.0 |
| Iron | Fe | — | 0.30 | 0.08 |
| Nickel | Ni | — | 0.30 | 0.05 |
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength (Rm) | EN 12164, temper-dep. | 360–500 | MPa |
| Proof Stress (Rp0.2) | EN 12164, temper-dep. | 150–400 | MPa |
| Elongation (A) | EN 12164, temper-dep. | 3–20 | % |
| Hardness | temper-dependent | 90–150 | HB |
| Machinability | vs CuZn39Pb3 = 100 | ~85% | — |
| Density | — | 8.40 | g/cm³ |
| Thermal Conductivity | — | ~115 | W/(m·K) |
| Melting Range | solidus–liquidus | 880–900 | °C |
| Standard | Designation |
|---|---|
| EN (Europe) | CW612N / CuZn39Pb2 |
| UNS / ASTM (USA) | C37700 (commercial cross-reference for forging duty — exact US twin of CW608N) |
| BS (UK legacy) | CZ128 |
| DIN (Germany) | CuZn39Pb2 |
| ISO | CuZn39Pb2 |
CW612N (CuZn39Pb2) is a low-lead free-machining brass per EN 12164, rated around 85% machinability. It is one of the most widely used machining and hot-forging brasses, for turned and forged parts across automotive, HVAC and general engineering.
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.
CW614N (CuZn39Pb3, 100% machinability) carries more lead for the fastest pure turning. CW612N (CuZn39Pb2, ~85%) has slightly less lead; both machine and hot-forge well. Choose by lead content and your forging requirements.
CW612N is commercially cross-referenced to US forging brass C37700 for forging duty (C37700's exact EN twin is CW608N); the former UK designation is CZ128. 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.