🟡 BRASS
Brass Machining and Supply in Flint, MI
Brass is the material that keeps Flint's screw machines and precision lathes humming. Fittings, fasteners, valve components, and electrical hardware all come off these machines in volume, and brass's free-machining behavior is exactly why those parts can be made fast, clean, and cheap. For buyers needing high-quantity precision-turned parts, the Flint area's turning shops bring real depth, and this page covers the grades and the work.
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Brass and the Precision-Turning Trade
Brass occupies a specific and valuable niche in Flint manufacturing: high-volume precision-turned parts. Screw machines, both cam-operated and CNC, turn brass fittings, fasteners, bushings, and valve components by the thousands, and the material's free-machining nature is what makes that economical. A brass part can be turned, threaded, and parted off in a fraction of the cycle time a steel equivalent would need.
The automotive supplier base that defines Flint feeds plenty of brass into fittings, connectors, electrical terminals, and fluid-system components. Brass combines decent corrosion resistance, good electrical conductivity, and excellent machinability, which suits the small precision parts that vehicles and equipment need in quantity.
Plumbing, valve, and industrial hardware round out brass demand. Brass resists corrosion in water and many fluids, machines to tight thread and bore tolerances, and takes plating well, which is why fittings and valve internals are so often brass. The Flint shops that specialize in turned parts treat brass as a staple.
C360, C260 and Naval Brass
C360 free-cutting brass is the benchmark for machinability, often used as the 100 percent reference against which other materials are rated. Its lead content lets it machine at high speed with excellent chip breaking and superb surface finish, which is why it dominates screw-machine fittings, fasteners, and turned components. For high-volume turned parts, C360 is almost always the default unless a specific requirement points elsewhere.
C260 cartridge brass trades some machinability for far better formability. With a 70-30 copper-zinc ratio, it draws, bends, and stamps without cracking, making it the choice for formed parts, deep-drawn components, and stamped electrical hardware. It is the grade for parts shaped by forming rather than cutting, where C360 would crack.
Naval brass adds a small amount of tin to standard brass, which dramatically improves resistance to corrosion in seawater and harsh environments, particularly dezincification, the selective leaching of zinc that destroys ordinary brass in water over time. It serves marine fittings, fasteners, and components exposed to salt and aggressive water, where standard brass would fail. Its machinability and formability sit between the free-cutting and cartridge grades.
What Makes Brass Easy to Produce
Brass's free-machining reputation is real and economically significant. C360 in particular cuts at high spindle speeds with low cutting forces, breaks chips into clean short pieces that clear easily, and leaves an excellent finish straight off the tool. This lets a screw-machine shop run brass faster, with less tool wear and fewer interruptions, than nearly any other metal, which directly lowers part cost on high-volume work.
This matters most for small precision parts. A turned brass fitting with threads, a bore, and a sealing surface can hold tight tolerances, often plus or minus 0.001 inch on critical diameters, while still running at high rate. Flint turning shops leverage this to quote competitive pricing on quantities that would be expensive in steel or stainless.
Brass also takes secondary operations well. It plates readily for appearance or corrosion protection, threads cleanly, and finishes nicely. The combination of fast machining and easy finishing is why brass remains the default for so much fitting, fastener, and hardware production despite copper-price-driven cost swings.
Sourcing and Specification Notes
Brass bar in free-machining grades is well stocked by regional service centers feeding the Flint-Detroit industrial belt, so material for turned parts is generally available with short lead times. The common hex and round bar sizes used for fittings and fasteners are readily on hand, which helps turning shops quote quick turnaround.
A growing specification consideration is lead content. Traditional free-cutting brasses like C360 contain lead for machinability, and regulations on lead in drinking-water and certain consumer applications have pushed some buyers toward low-lead or lead-free brass alternatives. If your part contacts potable water or falls under lead-restriction rules, specify a compliant grade and confirm the shop can source it. For most industrial, automotive, and mechanical applications, standard C360 remains the economical and appropriate choice.
Frequently Asked Questions
C360 free-cutting brass is so machinable that it is frequently used as the 100 percent benchmark against which the machinability of all other metals is rated. Its excellent machinability comes from its lead content, which acts as a chip breaker and lubricant during cutting, allowing the material to be machined at very high spindle speeds with low cutting forces, clean short chips that clear easily, and an excellent surface finish straight off the tool. For a screw-machine or precision-turning shop, this translates directly into faster cycle times, less tool wear, fewer interruptions to clear chips, and lower per-part cost, which is exactly why C360 dominates high-volume turned fittings, fasteners, and valve components. A turned brass part can be produced in a fraction of the time the same part would take in steel or stainless. This is the core reason Flint's turning shops keep C360 as their default brass: it lets them quote competitive pricing on the high quantities that automotive and industrial buyers need, while still holding tight tolerances on threads and bores.
Choose C260 cartridge brass when your part is shaped by forming rather than cutting. C260 has a 70-30 copper-zinc ratio that gives it excellent ductility and formability, so it draws, bends, deep-draws, and stamps without cracking, which is exactly what formed parts, stamped electrical hardware, and deep-drawn components require. C360, by contrast, is optimized for machining and contains lead that makes it more prone to cracking when you try to bend or form it sharply, so it is the wrong choice for a formed part even though it machines beautifully. The simple rule is that if the part is turned, drilled, threaded, or otherwise cut on a machine, C360 is your grade, and if the part is bent, drawn, or stamped into shape, C260 is your grade. Some parts combine both operations, in which case the dominant process and the criticality of crack-free forming usually decide. A Flint shop will guide you based on how the part is actually made, since picking the wrong grade leads either to poor machining or to cracked formed features.
Dezincification is a corrosion process specific to brass in which zinc is selectively leached out of the copper-zinc alloy, typically in water or moist environments over time, leaving behind a weak, porous, spongy copper structure that has lost its strength and can fail. It is a real failure mode for ordinary brass fittings and components exposed to water, especially aggressive or saltwater. Naval brass resists dezincification because it contains a small addition of tin, which stabilizes the alloy against zinc leaching and dramatically improves corrosion resistance in seawater and harsh water environments. That is why naval brass is the right choice for marine fittings, fasteners, and any brass component exposed to salt or aggressive water where standard brass would slowly self-destruct. Its machinability and formability fall between the free-cutting C360 and the formable C260 grades, so it is a bit harder to machine than C360 but still workable. If your brass part lives in seawater, marine atmosphere, or aggressive water service, specify naval brass or another dezincification-resistant grade rather than standard brass, and a Flint shop can source and machine it for you.
It matters in specific applications, mainly those involving drinking water or certain consumer products. Traditional free-cutting brasses like C360 contain lead, which is what gives them their outstanding machinability, but regulations have restricted lead content in components that contact potable water and in some consumer goods. If your brass part is a plumbing fitting, valve, or component that contacts drinking water, or if it falls under lead-restriction rules for your market, you need to specify a low-lead or lead-free brass alternative that meets the applicable standard, and you should confirm your Flint shop can source the compliant grade. These low-lead grades machine somewhat less freely than C360 but are designed to remain practical for turned parts. For the large majority of industrial, automotive, mechanical, and electrical applications that do not contact drinking water, standard leaded C360 remains fully appropriate and is the economical default. The key is to flag any potable-water or consumer-contact requirement up front when you request a quote, so the shop specifies a compliant material rather than defaulting to standard C360.
Flint screw-machine and precision-turning shops routinely hold tight tolerances on brass, commonly plus or minus 0.001 inch on critical diameters and bores, with thread quality and surface finishes that meet demanding fitting and valve requirements. Brass's free-machining behavior actually helps here, because the material cuts cleanly without the tool deflection, work-hardening, or built-up edge that fight you on tougher metals, so the shop can chase tight tolerances while still running at high production rate. Surface finishes come off the tool clean, often without secondary finishing, which matters for sealing surfaces on fittings and valve internals. For high-volume turned parts, this combination of tight tolerance and fast cycle time is precisely why brass is so widely used and why Flint's turning shops are well suited to the work. When you need exceptionally tight tolerances or specific finish callouts, share them on the print and the shop will plan tooling and process accordingly, but for typical fitting, fastener, and valve-component work, the standard precision-turning capability in the Flint area comfortably covers the requirements.
Last updated: July 2026
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