🟡 BRASS
Brass Waterjet Cutting for C360, C260, and Naval Brass
Brass is fast, clean, and forgiving on a waterjet, which is unsurprising for an alloy that machines like butter. The interesting part is what the cold cut protects: brass is a copper-zinc alloy, and keeping heat out of the edge avoids the zinc fuming and dezincification risk that thermal cutting introduces.
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Brass is roughly 60-70 percent copper and 30-40 percent zinc, and zinc has a low boiling point. Thermal cutting can vaporize zinc preferentially at the edge, producing zinc oxide fume and leaving a zinc-depleted, dezincified surface layer that is weaker and more porous. In plumbing and marine brass that dezincified layer is a corrosion liability. Laser cutting brass also runs into the same reflectivity and conductivity issues as copper, just less severely.
Abrasive waterjet cuts brass cold by erosion, so no zinc is boiled off, no dezincification occurs, and there is no fume to manage. The edge keeps its full copper-zinc ratio and its corrosion resistance. For naval brass and any brass headed into a corrosive or fluid-handling environment, that intact composition at the edge is a real metallurgical advantage over thermal cutting.
C360, C260, and naval brass behavior
C360 free-cutting brass is the most machinable copper alloy there is, rated 100 percent on the machinability scale, thanks to its lead content. On a waterjet that machinability is incidental since there is no chip, but C360 cuts fast and clean and is the common choice for fittings, valve bodies, and fasteners. C260 cartridge brass has higher zinc and no lead, making it more ductile and formable; it cuts cleanly and is favored for deep-drawn and formed parts and decorative work.
Naval brass, C464, adds a small amount of tin to resist dezincification in seawater, and it is the grade for marine hardware. On the waterjet all three cut at similar, brisk rates because brass is moderately dense but not tough. The cold cut preserves whatever temper the brass was supplied in, and for naval brass it keeps the dezincification-resistant composition fully intact at the edge, which is precisely the point of choosing that grade.
Edge quality, finish, and decorative considerations
Brass comes off the waterjet with a clean, square edge and a minimal burr; it is one of the nicer metals to cut, with little of the gumminess of pure copper. On 0.125 inch C360 expect +/-0.003 to +/-0.005 inch, and on 0.5 inch +/-0.005 inch with light taper. There is no heat tint, no scale, and no discoloration, so decorative and architectural brass keeps its appearance.
For decorative signage, hardware, and trim, the waterjet edge often needs only light deburring before polishing or plating. The Q3 striations on the lower edge are easily polished out where appearance matters. Because brass is frequently chosen for looks as much as function, the absence of heat discoloration is a genuine benefit; a thermal cut would leave a tinted, oxidized edge that has to be cleaned up, while the waterjet edge is bright bare brass.
Cost, speed, and when a die beats the jet
Brass is a fast, economical waterjet material: it cuts quickly, consumes garnet at the normal rate, and needs no tooling, so prototype and short-run brass parts are cheap and fast, often shipping in a few days. Material cost is moderate, between aluminum and copper, so nesting matters but is not the dominant factor it is for precious or exotic alloys.
The honest limit is high volume. For thousands of identical flat brass parts, a stamping or blanking die will beat the waterjet on per-part cost and speed, and brass's excellent formability makes it ideal for die work. The waterjet wins for prototypes, low-to-medium runs, thick brass plate, intricate profiles where tooling would be expensive, and any part where the cold, fume-free, tint-free edge is worth having. Below a few hundred pieces, the tooling-free waterjet is usually the cheaper total cost; above that, get a die quote.
Frequently Asked Questions
No. Dezincification is the selective loss of zinc from a copper-zinc alloy, leaving a weak, porous, copper-rich layer, and thermal cutting can trigger it at the edge by preferentially boiling off the low-boiling-point zinc. Abrasive waterjet cuts brass cold by erosion, so no zinc is vaporized and no dezincified layer forms; the edge keeps its full copper-zinc ratio and corrosion resistance. There is also no zinc oxide fume to manage, which thermal cutting of brass produces. This matters most for naval brass and other grades chosen specifically for dezincification resistance in marine or fluid-handling service, where a dezincified edge would defeat the purpose of the alloy. The cold cut preserves exactly the composition and corrosion behavior the grade was selected for, right up to the kerf wall.
Brass cuts briskly. A 90,000 psi abrasive waterjet cuts 0.25 inch C360 at roughly 10-16 inches per minute at a Q3 finish, 0.5 inch at about 5-8 ipm, and 1 inch at 2.5-4 ipm. All three common grades, C360, C260, and naval brass, cut at similar rates because brass is moderately dense but not tough. Practical good-quality maximum is around 3-4 inches, with thicker possible at slower speeds. Brass is one of the more pleasant and economical metals to waterjet, cutting faster than stainless and with a cleaner edge than pure copper. For thin brass in high volume a stamping die is cheaper per part, but for prototypes, short runs, thick plate, and intricate profiles the tooling-free waterjet is fast and cost-effective.
No, and that is one of its advantages for decorative and architectural work. Because the cut is cold, there is no heat tint, oxidation, or discoloration at the edge; the waterjet leaves bright bare brass with only a square top edge and a minor burr. A thermal cut, by contrast, leaves a tinted, oxidized edge that has to be cleaned up before polishing or plating. On the waterjet, the only cleanup typically needed is a light deburr and, where appearance is critical, a quick polish to remove the Q3 striations on the lower portion of the edge. For brass signage, hardware, trim, and ornamental panels, the bright, untinted cut means less finishing work and a better starting surface for the final polish or plate.
Use a die when volume is high and the part is a flat profile. Brass is highly formable and ideal for stamping and blanking, so for thousands of identical pieces a die wins decisively on per-part cost and speed, often by an order of magnitude, even after amortizing the tooling. The crossover is usually somewhere in the few-hundred-piece range, depending on part complexity and die cost. Below that, the tooling-free waterjet is cheaper total cost and far faster to first part, shipping in a few days with no tooling lead time. Waterjet also wins regardless of volume for thick brass plate a die cannot punch, very intricate profiles where the die would be expensive, parts needing the cold fume-free edge, and prototypes or design iterations where committing to tooling is premature. Get both quoted near the crossover volume.
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Last updated: July 2026
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