Brass is one of the most versatile materials in sheet metal fabrication, but "brass" is not a single metal. It is a family of copper-zinc alloys, and the grade you choose determines how well a part bends, draws, resists corrosion, and holds its finish. For anyone sourcing brass sheet metal parts, understanding the common grades and what each one does best is the difference between a part that forms cleanly and one that cracks on the press.
What makes brass grades different
Brass grades are defined by the ratio of copper to zinc, plus small additions of other elements. These changes are not cosmetic. A few percent of zinc shifts the alloy from soft and ductile to hard and strong. Adding tin improves resistance to saltwater corrosion. Adding lead improves machinability. Because of this, every grade has a specific job, and the grade that works for a decorative trim piece is rarely the right choice for a structural bracket.
The brass grades most often used for sheet metal parts
Most stamped and formed brass parts are made from one of a handful of standard grades. Here is what each one is best at:
C26000 Cartridge Brass (70% copper, 30% zinc). The most common brass for stamping and deep drawing. It offers the best cold-working characteristics of any brass alloy, so it can be bent, drawn, and formed without cracking, and it develops a clean surface finish after forming. It is the go-to choice for drawn cups, brackets, housings, terminals, radiator parts, and any component produced by stamping or deep drawing.
C28000 Muntz Metal (60% copper, 40% zinc). The higher zinc content gives this grade more strength and excellent hot-working properties. It suits architectural panels, condenser plates, and heavier structural components where strength matters more than extreme formability.
C46400 Naval Brass (60% copper, about 39% zinc, 1% tin). The tin addition resists dezincification and saltwater corrosion, which makes this the standard choice for marine hardware, fasteners, and parts exposed to moisture and salt.
C23000 Red Brass (85% copper, 15% zinc). With its high copper content, this grade offers excellent corrosion resistance and a distinctive reddish-gold color. It is often used in plumbing, fire-safety, and decorative applications.
C36000 Free-Cutting Brass (61.5% copper, 35.5% zinc, 3% lead). This is not a stamping grade, but it is worth knowing because it is the standard material for machined fittings, valves, and connectors that are often joined to stamped parts. The lead acts as a chip breaker, allowing high-speed machining with clean edges.
Lead-free options. Grades such as C69300 silicon brass and bismuth brass ｒｅｐｌａｃｅ lead with other elements that preserve machinability. They are required for components that come into contact with potable water in the United States and several other markets.
How to choose the right grade for your part
There is no single "best" brass. The right grade depends on how the part is made and where it will be used. Work through these five factors in order:
1. Forming method. If the part is stamped or deep drawn, choose a ductile grade such as C26000. If it will be hot forged, C28000 is a better fit. If it will be CNC machined, C36000 is the usual starting point.
2. Service environment. Marine or coastal exposure calls for C46400. Potable-water contact calls for a lead-free grade. For indoor use, the widest range of grades is acceptable.
3. Strength and wear. Load-bearing components may need the higher strength of C28000, while lighter decorative parts can use a softer, more formable alloy.
4. Finish and appearance. Higher-copper grades take a more consistent polish and hold their color better, which matters for visible parts.
5. Cost and availability. C26000 and C36000 are the most widely available and cost-effective grades. Specialty grades such as lead-free silicon brass carry a price premium, so reserve them for applications that actually require them.
Working with a brass sheet metal parts manufacturer
Specifying the right grade is only half the job. The other half is working with a manufacturer that understands how that grade behaves on the press. A capable stamping partner will review the grade against the part geometry, recommend a more formable alloy if the draw is deep, and make sure the die design and secondary operations such as bending, trimming, welding, and finishing are matched to the material.
This is where a manufacturer with in-house tooling makes a real difference. DIAN STAMPING designs and builds its own progressive, transfer, and tandem dies, so a new part can move from prototype to production without the delays of coordinating a separate tool shop. With more than 20 years of experience, a 50,000-square-meter facility, and a team of roughly 110 employees including about 35 die designers, the company supports custom sheet metal parts from single prototypes to high-volume runs. Its checking fixtures and welding jigs keep dimensional quality consistent from batch to batch, which matters when a brass part has to mate with other components in an assembly.
Because the company works from 2D drawings, 3D data, or physical samples, you can send the part definition you already have and let the engineering team confirm the grade and the tooling before production starts. That early review is where most forming problems are caught, before they become scrap on the press.
Final thoughts
The brass grade you specify is an engineering decision, not a detail to leave to chance. Match the grade to the forming method and the service environment, and work with a manufacturer that can turn that material into a reliable part. Get both right, and your sheet metal parts will deliver the strength, corrosion resistance, and appearance your product needs.