Weight %. Single-phase alpha at 37% Zn — maximum cold formability in the common brass family.
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Copper | Cu | 62.0 | 64.0 | 63.0 |
| Zinc | Zn | Balance | ~37 | |
| Lead (max) ✓ | Pb | — | 0.10 | ≤0.05 |
| Iron | Fe | — | 0.10 | 0.03 |
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength (Rm) | annealed | 300–380 | MPa |
| Tensile Strength (Rm) | hard | 540–620 | MPa |
| Proof Stress (Rp0.2) | annealed | ≥100 | MPa |
| Elongation (A) | annealed | ≥45 | % |
| Hardness | annealed | 65–80 | HB |
| Machinability | vs C36000 = 100 | ~50% | — |
| Density | — | 8.44 | g/cm³ |
| Electrical Conductivity | — | ~27 | % IACS |
| Melting Range | solidus–liquidus | 905–940 | °C |
| Standard | Designation |
|---|---|
| EN (Europe) | CuZn37 / CW508L |
| ASTM (USA) | C27200 / C26000 (Cartridge Brass) |
| BS (UK legacy) | CZ108 |
| DIN (Germany) | CuZn37 |
| JIS (Japan) | C2600 (close) |
CuZn37 (CW508L) — 63% copper, 37% zinc — is the classic cold-working brass. Its single-phase alpha structure gives the best deep-drawing and cold-heading behaviour of the common brasses, which is why it is the standard for deep-drawn stampings, radiator parts, cartridge cases 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 50% 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/C26800 family cartridge brass and the former UK designation CZ108. Brassland supplies EN 10204 Type 3.1 mill certificates with every lot.
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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: 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.