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.
Brassland machines CW612N 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.