Weight %. Single-phase alpha at 37% Zn — the main brass for cold forming; brasses with less zinc form even better but cost more, as copper is the dearer metal.
| Element | Symbol | Min % | Max % |
|---|---|---|---|
| Copper | Cu | 62.0 | 64.0 |
| Zinc | Zn | Balance | |
| Lead (max) ✓ | Pb | — | 0.10 |
| Iron | Fe | — | 0.10 |
Bars show the range from the table: bar length at mid-range, zinc as the remainder.
Strength depends on the product standard (EN 12163 rod, EN 12167 profiles, EN 1652 sheet and strip) and the condition; the ranges below are for EN 1652 sheet across its conditions. Physical properties are typical values; a range shows the spread of published data (references: Kupferverband/DKI data sheet; Copper Development Association, UNS equivalent C27200). The EN 10204 3.1 certificate reports the values of the supplied material.
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength | EN 1652 sheet, across conditions | 300–550 | MPa |
| 0.2 % Proof Stress | EN 1652 sheet, across conditions | 110–500 | MPa |
| Elongation (A50) | EN 1652 sheet, across conditions | 38–3 | % |
| Hardness | EN 1652 sheet, across conditions | 55–180 | HV |
| Density | at 20 °C | 8.44 | g/cm³ |
| Melting Range | solidus–liquidus | 902–920 | °C |
| Thermal Conductivity | at 20 °C | 116–120 | W/(m·K) |
| Electrical Conductivity | at 20 °C | 26–28 | %IACS |
| Thermal Expansion | 20–300 °C | 20.5–21 | ×10⁻⁶/K |
| Modulus of Elasticity | at 20 °C | 103–110 | GPa |
| Machinability | CW614N = 100; Kupferverband (DKI) machinability group II, moderate | ~35 | index |
| Standard | Designation |
|---|---|
| EN (Europe) | CuZn37 / CW508L |
| UNS / ASTM — equivalent | C27200 — Yellow Brass (Cu 62–65 %) |
| Not to be confused with | C26000 — cartridge brass, 70/30 (Cu 68.5–71.5 %) |
| BS (UK legacy) | CZ108 |
| DIN (Germany) | CuZn37 |
| JIS (Japan) — overlapping | C2700 — JIS H3250 rod (Cu 63–67 %) |
CuZn37 (CW508L) — 63% copper, 37% zinc — is a classic cold-working brass. Its single-phase alpha structure gives excellent cold-working and deep-drawing behaviour, which is why it is widely used for deep-drawn stampings, radiator parts and formed automotive components.
Yes — CuZn37 is effectively lead-free by composition, so it is RoHS compliant without needing Exemption 6(c). That makes it a safe specification for RoHS-critical formed parts.
At around 35% machinability (CW614N = 100; Kupferverband/DKI group II, moderate machinability) it produces longer, more ductile chips than free-machining grades. For predominantly turned parts, CW614N or CW612N are better choices; specify CuZn37 when forming, bending or drawing dominates the process chain.
Rod and profiles are specified in EN 12167 (designation CW508L); the US equivalent is C27200 yellow brass (Cu 62–65 %), and the former UK designation is CZ108. C26000 is cartridge brass (70/30) — a different alloy. Brassland supplies EN 10204 Type 3.1 mill certificates with every lot.
Write the standard and designation together, for example “CuZn37 / CW508L”. The table above gives values by condition (annealed, hard); state the condition or a minimum property on the drawing when it matters. 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.
CuZn37 / CW508L. The UNS equivalent is C27200 (yellow brass).Primary source: Kupferverband (DKI) — CuZn37 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 CuZn37 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.