Weight %. The reduced Pb window trades some machinability for genuine post-machining formability.
| Element | Symbol | Min % | Max % |
|---|---|---|---|
| Copper | Cu | 59.0 | 60.0 |
| Zinc | Zn | Balance | |
| Lead | Pb | 1.6 | 2.5 |
| Iron | Fe | — | 0.30 |
| Nickel | Ni | — | 0.30 |
Bars show the range from the table: bar length at mid-range, zinc as the remainder.
EN 12164 condition values (minimum values). Condition names give the minimum tensile strength; hardness conditions (H…) are an alternative way to order. The EN 10204 3.1 certificate reports the values of the supplied bar. Physical properties are typical values; a range shows the spread of published data (references: Kupferverband/DKI data sheet; Copper Development Association, UNS equivalent C37700).
| Property | Condition | Value | Unit |
|---|---|---|---|
| Condition M | as manufactured | no limits | — |
| Tensile / Elongation | R360, Ø6–80 mm | ≥360 / ≥20 | MPa / % |
| Tensile / 0.2 % Proof / Elongation | R410, Ø2–40 mm | ≥410 / ≥230 / ≥12 | MPa / MPa / % |
| Tensile / 0.2 % Proof / Elongation | R500, Ø2–14 mm | ≥500 / ≥350 / ≥8 | MPa / MPa / % |
| Hardness | hardness conditions H070 / H100 / H120 | 70–100 / 100–145 / ≥120 | HB |
| Density | at 20 °C | 8.43–8.45 | g/cm³ |
| Melting Range | solidus–liquidus | 880–900 | °C |
| Thermal Conductivity | at 20 °C | 109–119 | W/(m·K) |
| Electrical Conductivity | at 20 °C | 24–27 | %IACS |
| Thermal Expansion | 20–300 °C | 20.7–21.1 | ×10⁻⁶/K |
| Modulus of Elasticity | at 20 °C | 102–103 | GPa |
| Machinability | vs CuZn39Pb3 = 100 | ~85 | index |
| Standard | Designation |
|---|---|
| EN (Europe) | CW612N / CuZn39Pb2 |
| UNS / ASTM (USA) | C37700 — equivalent (CW612N lies inside its limits; so does CW608N) |
| BS (UK legacy) | CZ128 |
| DIN (Germany) | CuZn39Pb2 |
| ISO | CuZn39Pb2 |
| JIS (Japan) — nearest | C3771 — JIS H3250 forging brass (Cu 57–61, Pb 1.0–2.5) |
CW612N (CuZn39Pb2) is a leaded free-machining brass per EN 12164 with 1.6–2.5% lead, rated around 85% machinability. It is a common machining and hot-forging brass 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.
The UNS equivalent is C37700 forging brass: CW612N’s copper and lead ranges lie inside the C37700 limits, as do those of CW608N, its other EN equivalent. 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: September 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.