C36000 Free-Cutting Brass: The Machinability Standard
ASTM B16/B116 · Updated: 2026-05-25
C36000 free-cutting brass (61.5% Cu, 35.5% Zn, 3% Pb) is the standard against which all other metals' machinability is measured—rated at 100% on the machinability index. The dispersed lead particles act as chip breakers and tool lubricants, enabling high-speed automatic screw machine production with excellent surface finish and long tool life. Used for precision turned parts: plumbing fittings, valve bodies, electrical connectors, and pneumatic components produced by the millions on automatic lathes. Not recommended for welding due to zinc fuming and lead contamination. For lead-free requirements (drinking water), use C27400 or silicon brass C87800.
Quick Facts
| Category | Brass & Bronze |
| Standard | ASTM B16/B116 |
| Density | 8.50 g/cm³ |
| Yield Strength | 124 MPa (18 ksi) annealed; 310 MPa (45 ksi) hard |
| Tensile Strength | 338 MPa (49 ksi) annealed; 469 MPa (68 ksi) hard |
Global Equivalents & Cross-Reference
| Alternative Standard / Grade | Action |
|---|---|
| EN CuZn36Pb3 | Compare |
| CW603N | Compare |
| JIS C3601 | Compare |
| HPb59-1 | Compare |
| ISO CuZn36Pb3 | Compare |
Related Materials
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Frequently Asked Questions
Is C36000 brass suitable for drinking water contact?
In most jurisdictions, C36000 is restricted for drinking water components due to its lead content (2.5-3.7%). The US Safe Drinking Water Act (SDWA) limits lead in plumbing products to 0.25% weighted average. For lead-free applications, specify C27400 (low-lead brass), bismuth-modified brasses, or C87800 silicon brass which meet NSF/ANSI 61 and SDWA requirements.