Weight %. Values of EN 12164:2024 and EN 12165:2024 — the 2016 editions allowed 1.6–2.5% lead, so older mill certificates may still quote the 2.5% maximum. The α+β duplex structure at ~40% Zn is what makes this grade flow so well in closed dies.
| Element | Symbol | Min % | Max % |
|---|---|---|---|
| Copper | Cu | 57.0 | 59.0 |
| Zinc | Zn | Balance | |
| Lead | Pb | 1.6 | 2.2 |
| 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 (reference: Kupferverband/DKI data sheet).
| Property | Condition | Value | Unit |
|---|---|---|---|
| Condition M | as manufactured | no limits | — |
| Tensile / Elongation | R360, Ø6–80 mm | ≥360 / ≥20 | MPa / % |
| Tensile / 0.2 % Proof / Elongation | R430, Ø2–40 mm | ≥430 / ≥220 / ≥10 | MPa / MPa / % |
| Tensile / 0.2 % Proof / Elongation | R500, Ø2–14 mm | ≥500 / ≥350 / ≥5 | MPa / MPa / % |
| Hardness | hardness conditions H090 / H110 / H135 | 90–125 / 110–160 / ≥135 | HB |
| Density | at 20 °C | 8.40–8.44 | g/cm³ |
| Melting Range | solidus–liquidus | 880–895 | °C |
| Thermal Conductivity | at 20 °C | 113–123 | W/(m·K) |
| Electrical Conductivity | at 20 °C | 24–27 | %IACS |
| Thermal Expansion | 20–300 °C | 21.0–21.1 | ×10⁻⁶/K |
| Modulus of Elasticity | at 20 °C | 96–97 | GPa |
| Machinability | CuZn39Pb3 = 100; Kupferverband (DKI) machinability group I, very good | ~90 | CW614N = 100 |
| Standard | Designation |
|---|---|
| EN (Europe) | CW617N / CuZn40Pb2 |
| UNS / ASTM — equivalent | C38000 — ASTM B455 (CW617N lies inside its limits) |
| UNS — cross-referenced (forging) | C37700 — Forging Brass, ASTM B283 / B124 (overlaps at Cu 58–59 %) |
| BS (UK legacy) | CZ122 |
| DIN (Germany) | CuZn40Pb2 / Ms58 |
| JIS (Japan) | C3771 (hot-forging duty); C3604 sometimes cross-referenced — verify Pb (JIS allows up to 3.7%) |
| GB (China) | HPb59-1 (close) |
CW617N (CuZn40Pb2) is the workhorse hot-working brass of EN 12164/12165: its alpha-beta structure flows beautifully at forging temperature, making it the standard grade for hot-forged valve bodies, fitting bodies and stamped parts, which are then finish-machined — it machines at roughly 90% of the C36000/CW614N free-cutting benchmark.
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. Where lead-free material is required — for example for potable-water wetted surfaces under NSF/ANSI 372 in the US — specify CW724R or C6802 lead-free brass instead.
Choose CW617N when the part starts life as a hot forging or stamping; choose CW614N (CuZn39Pb3) when the part is machined entirely from drawn rod, since its higher lead gives better chip-breaking on CNC and Swiss lathes. Both are RoHS-compliant under Exemption 6(c).
The UNS equivalent is C38000, whose limits contain CW617N’s; since its 2026 edition ASTM B455 lists both. C37700 forging brass (ASTM B283 / B124) is commonly cross-referenced for forging duty, and CZ122 is the former UK BS designation. Composition is specified in EN 12164 (rod) and EN 12165 (forging stock); Brassland supplies EN 10204 Type 3.1 mill certificates with every lot.
Write the standard and designation together, for example “EN 12164 – CW617N / CuZn40Pb2 – R360”. State it whenever a minimum tensile strength or hardness matters — the table above lists the values per temper (R360, R430, R500). Tolerances follow ISO 2768-m unless the title block says otherwise.
The mill’s EN 10204 Type 3.1 inspection certificate for the alloy lot reports the measured chemical composition and mechanical test results. Brassland adds a Certificate of Conformity for the order and RoHS and REACH declarations at no charge; PPAP Level 1–3 packages are available for OEM qualification.
EN 12164 – CW617N / CuZn40Pb2 – R360. The UNS equivalent is C38000 (ASTM B455); C37700 — Forging Brass is commonly cross-referenced for forging duty.Primary source: Kupferverband (DKI) — CuZn40Pb2 data sheet.
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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 CW617N 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.