Weight %. Slightly higher Cu and wider Pb window (max 3.7%) than EN 12164 leaded grades — check your spec when substituting CW614N (Pb max 3.5%).
| Element | Symbol | Min % | Max % | Typical % |
|---|---|---|---|---|
| Copper | Cu | 60.0 | 63.0 | 61.5 |
| Zinc | Zn | Balance | ~35.4 | |
| Lead | Pb | 2.5 | 3.7 | 3.1 |
| Iron | Fe | — | 0.35 | 0.10 |
| Property | Condition | Value | Unit |
|---|---|---|---|
| Tensile Strength | O60 soft → H02 half-hard | 340–470 | MPa |
| Yield Strength | O60 soft → H02 half-hard | 125–310 | MPa |
| Elongation | H02 half-hard, typical | ~25 | % |
| Hardness | H02 half-hard, typical | ~78 | HRB |
| Machinability | vs C36000 = 100 | 100% | — |
| Elastic Modulus | — | ~97 | GPa |
| Density | — | 8.49 | g/cm³ |
| Thermal Conductivity | — | ~115 | W/(m·K) |
| Melting Range | solidus–liquidus | 885–900 | °C |
| Standard | Designation |
|---|---|
| UNS / ASTM (USA) | C36000 — ASTM B16 |
| EN — closest match | CW603N / CuZn36Pb3 |
| EN — commercial | CW614N / CuZn39Pb3 |
| BS (UK legacy) | CZ124 |
| JIS (Japan) | C3604 (close) |
| Trade name | 360 Brass / Free-Cutting Brass |
C36000 — also sold as 360 brass or free-cutting brass — is the standard North American free-machining brass per ASTM B16, with 60–63% copper and 2.5–3.7% lead. It is the alloy against which copper-alloy machinability is rated (100%), and the default choice for high-speed screw-machined parts such as fittings, connectors, fastener components, and sensor bodies.
The closest EN composition match is CW603N (CuZn36Pb3). In commercial cross-reference tables C36000 is also very commonly matched to CW614N (CuZn39Pb3), the standard European free-machining grade, which behaves near-identically in machining. The legacy British designation is CZ124, and JIS C3604 is a close Japanese equivalent.
C36000 relies on RoHS Annex III Exemption 6(c), which permits up to 4% lead in copper alloys (currently valid to 30 June 2027). It is not suitable for wetted parts in US potable-water systems, where NSF/ANSI 372 limits weighted lead content to 0.25% — specify a lead-free grade such as CW724R or C6802 instead.
Yes — parts are machined to your drawing and specification. Depending on bar availability we machine C36000 or the equivalent EN free-machining grades CW614N/CW603N; the exact grade and a Type 3.1 mill certificate (EN 10204) are confirmed at quotation. Send your drawing for a quote within 24 hours.
The US benchmark free-cutting brass, made 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.