Weight %. Slightly lower Zn than CW617N shifts the balance toward ductility while Pb keeps machining economical.
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Copper | Cu | 59.0 | 62.0 | 60.5 |
| Zinc | Zn | Balance | ~37.5 | |
| Lead | Pb | 1.5 | 2.5 | 2.0 |
| Iron | Fe | — | 0.30 | 0.08 |
| Nickel | Ni | — | 0.30 | 0.05 |
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength (Rm) | R360 | 360–470 | MPa |
| Proof Stress (Rp0.2) | R360 | ≥140 | MPa |
| Elongation (A) | R360 | ≥20 | % |
| Hardness | R360 typical | 90–115 | HB |
| Machinability | vs C36000 = 100 | ~72% | — |
| Density | — | 8.50 | g/cm³ |
| Thermal Conductivity | — | ~125 | W/(m·K) |
| Melting Range | solidus–liquidus | 900–930 | °C |
| Standard | Designation |
|---|---|
| EN (Europe) | CW625N / CuZn38Pb2 |
| BS (UK legacy) | CZ128 |
| DIN (Germany) | CuZn38Pb2 |
| ISO | CuZn38Pb2 |
| ASTM (USA) | C37700-family (close) |
CW625N (CuZn38Pb2) is a mid-zinc leaded brass per EN 12164 rated around 72% machinability. It sits between CW614N and the low-lead grades, and is widely used for plumbing fitting bodies, pneumatic components and general turned parts.
Yes, under RoHS Annex III Exemption 6(c) (lead up to 4% in copper alloys), currently valid to 30 June 2027. For mandatory lead-free applications specify CW724R or C6802 silicon brass.
All three are leaded machining brasses. CW614N (CuZn39Pb3) has the most lead and the best chip-breaking for pure bar turning; CW617N (CuZn40Pb2) is the hot-forging grade; CW625N (CuZn38Pb2) offers a middle path — good machinability with slightly better cold formability, suited to fittings that see light swaging or flaring.
The nearest equivalents are C37700-family leaded brasses (US, ASTM) and former UK designation CZ128. Composition is specified in EN 12164; Brassland supplies EN 10204 Type 3.1 mill certificates with every lot.
Machining economy plus forming headroom, 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: 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.