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 | CDA scale, C36000 = 100 | ~30% | — |
| 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 30% machinability (CDA scale, C36000 = 100) 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.
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.