Choosing the right brass alloy for precision turning
Brass is prized in precision machining for a reason: it cuts cleanly, holds tight tolerances and finishes beautifully. But “brass” is a family of copper-zinc alloys, and the grade you specify has a direct effect on cost, cycle time and part performance.
Free-cutting brass (CuZn39Pb3)
For most turned components, free-cutting brass — CuZn39Pb3, also known as CW614N — is the default. A small lead addition breaks chips and lubricates the cut, giving excellent machinability, fast cycle times and clean threads. It is the alloy behind the majority of fasteners, inserts and fittings.
When to consider other alloys
- Higher strength or dezincification resistance — consider DZR or higher-copper grades for plumbing and marine use.
- Lead-free requirements — low-lead and lead-free brasses meet stricter drinking-water and RoHS-adjacent rules, at some cost to machinability.
- Cold forming or riveting — more ductile alloys hold up better to forming operations.
Match the alloy to the application
The right answer is rarely “the cheapest to machine” — it is the alloy that meets the part's mechanical, regulatory and finishing needs at the lowest total cost. Share your drawing and end-use, and an experienced supplier will recommend the grade and finish that fit.
Sourcing brass components?
Send your drawing — we'll advise on alloy, tolerance and finish.
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