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When a leaking pipe flange, worn gasket seat, or custom fabrication project demands a reliable metal blank, finding the right diameter and thickness in one place can be a challenge. Whether you're a plumber patching a drain assembly, a hobbyist building a custom bracket, or a maintenance technician replacing a corroded backing plate, these copper, brass, and stainless steel round sheet plates give you the exact starting point you need — without cutting waste or minimum-order headaches.
Each disc is cut from flat sheet stock in your choice of three materials — pure copper, brass alloy, or 304 stainless steel — and is available in diameters of 50mm (≈2.0 in), 87.5mm (≈3.4 in), 100mm (≈3.9 in), 150mm (≈5.9 in), and 200mm (≈7.9 in). Wall thickness options span 0.8mm through 5mm, letting you match the mechanical demands of your application. Surfaces are smooth-rolled with consistent flatness across the face.
Typical use cases include: copper round plates for soldered pipe end caps and heat-transfer pads in DIY plumbing; brass discs as decorative escutcheon blanks or valve backing plates; and 304 stainless steel round sheets for outdoor drain covers, marine hardware backing, and corrosion-resistant fabrication in wet environments. Long-tail applications include custom gasket blanks, electrical grounding pads, and craft metalworking projects requiring pre-cut round stock.
| Material Options | Copper / Brass / 304 Stainless Steel |
|---|---|
| Shape | Round disc (flat plate) |
| Diameter (Ø) | 50mm / 87.5mm / 100mm / 150mm / 200mm |
| Thickness | 0.8mm / 1mm / 1.5mm / 2mm / 2.5mm / 3mm / 5mm |
| Surface Finish | Smooth-rolled flat |
| Stainless Steel Grade | 304 (18/8) |
| Pack Quantity | See variant options |
| Hole / Perforation | None (solid disc) |
| Edge Condition | Clean-cut, no burr treatment included |
| Weight per Piece | See variant options |
Measure the outer diameter of the pipe end, flange recess, or opening you need to cover or back, then select the next size up if you need overlap. For example, a standard 4-inch (≈100mm) drain opening pairs well with the 150mm disc when a sealing lip is required. Use the 50mm disc for small pipe end caps or 1½-inch fittings.
For compressible gasket blanks that will be cut and compressed under a flange, 0.8mm–1mm copper or brass is typical. For rigid shims or backing plates that must resist deformation under bolt load, 2mm–3mm is recommended. The 5mm option (available in 304 stainless steel, 87.5mm diameter) suits heavy-duty structural backing.
Yes. 304 stainless steel (18/8 grade) offers good resistance to atmospheric corrosion, fresh water, and mild chemical exposure. It is widely used in outdoor drain covers, marine hardware backing plates, and wet-area fabrication. For highly saline or chloride-rich environments, 316 stainless steel is generally preferred — please confirm suitability for your specific conditions.
Yes. Copper round plates are compatible with standard lead-free plumbing solder and flux. Clean the surface with fine abrasive or flux before soldering to ensure a reliable joint. They are commonly used as end caps, heat spreaders, and custom fittings in DIY plumbing repairs.
The discs are clean-cut and generally safe to handle with normal care. However, as with any cut metal, edges may have minor sharpness depending on thickness. We recommend light deburring with a file or fine sandpaper before installation in applications where the edge will be exposed or handled frequently.
Copper offers superior thermal conductivity and is the traditional choice for soldered plumbing connections and heat-transfer applications. Brass (a copper-zinc alloy) is harder, machines more easily, and provides good corrosion resistance without soldering — making it ideal for threaded backing plates, valve seats, and decorative escutcheons. Both are compatible with potable water systems when used appropriately.
Yes. All three materials — copper, brass, and 304 stainless steel — can be drilled with standard HSS (high-speed steel) drill bits. Use cutting fluid or lubricant when drilling stainless steel to prevent work hardening. Thinner gauges (0.8mm–1mm) can also be punched with appropriate tooling.
