CZ121 / CW614N (free-machining brass) — Properties, Machinability & Equivalents

Mechanical & physical properties

Property	Typical value
Density	8500 kg/m³
Yield	~140–350 MPa
Tensile	340–470 MPa
Elongation	~15–30 %
Young's E	97 GPa
Hardness	~95–150 HB
CTE	~21 µm/m·K
Thermal cond.	~115 W/m·K
Max service	~200 °C
Poisson ν	~0.34
Shear modulus G	~36 GPa (derived)
Shear strength	~210–310 MPa (temper-dependent, published)
Specific heat	~380 J/kg·K
Elec. conductivity	~26 %IACS
Melting range	~885–900 °C

Typical values for guidance — properties vary with section size, temper and batch. Check the material certificate for certification work.

Excellent

~100% (brass reference). Lead gives free chip; ideal for CNC/auto.

Poor

Not fusion-welded; braze/solder readily.

Equivalents & alternatives: CW614N (CZ121); UNS C36000 (US free-cutting brass). Alt: CZ131 (CW606N) low-lead, CZ108 (CW508L) cold-forming.

C36000 (CuZn35Pb3) is slightly higher Cu than CW614N; both are "free-cutting brass" on drawings.

General machiningElectrical & thermal

Tin-phosphor bronze — bearings, bushes, springs, wear parts. Excellent wear + corrosion.

Leaded gunmetal — bearings, bushes, valve bodies, pump parts. Good bearing + corrosion, castable.

Got a part to make in CZ121?
Upload your CAD and see a price in under a minute — a UK engineer confirms every quote within 24 hours.