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When your project demands a flat, dimensionally consistent metal disc that won't flex under load or corrode in damp environments, finding the right blank off the shelf can be frustrating. These brass disc blanks are designed for makers, machinists, hobbyists, and small-workshop fabricators who need a reliable starting point — whether you're cutting a custom gasket, stamping a pendant, or shimming a mechanical assembly.
Each disc is cut from solid brass sheet stock at a uniform 2mm (approximately 5/64 in) thickness. Diameters range from 20mm (~13/16 in) up to 150mm (~5-29/32 in), covering the most common sizes used in light fabrication and craft metalwork. The flat, unfinished surface is ready for drilling, filing, engraving, or chemical patination without additional prep.
Typical applications include sealing gaskets for plumbing and pneumatic fittings, decorative disc blanks for jewelry stamping and enameling, shim stock for machinery alignment, and backing plates for leather or resin craft projects — all scenarios where a consistent brass round gasket sheet saves significant layout and cutting time.
Available from 20mm to 150mm in 12 size options, so you can match the exact footprint your project requires without over-cutting larger stock.
Consistent 2mm cross-section throughout each disc ensures flat seating surfaces and predictable material removal when machining or filing to final dimension.
Brass naturally resists oxidation and moisture-related degradation, making these discs suitable for both indoor and mildly humid outdoor applications without surface treatment.
The flat, uncoated surface accepts drilling, stamping, engraving, soldering, and chemical patination directly — no stripping or degreasing of factory coatings required.
Order 1, 2, 4, or 5 pieces per listing to match your project run — whether you need a single prototype disc or a small batch for production gaskets.
Equally at home as a sealing gasket blank, a jewelry stamping disc, a shim plate, or a decorative craft element — one format, many end uses.
| Material | Brass (copper-zinc alloy) |
|---|---|
| Thickness | 2mm (~5/64 in) |
| Diameter Range | 20mm – 150mm (~13/16 in – 5-29/32 in) |
| Available Diameters | 20, 25, 30, 35, 50, 60, 70, 80, 90, 100, 120, 150 mm |
| Surface Finish | Unfinished / Mill finish |
| Shape | Round disc (flat) |
| Quantity per Order | 1, 2, 4, or 5 pcs (see variant options) |
| Tolerance (Diameter) | See variant options |
| Hardness | See variant options |
| Weight per Piece | See variant options |
Measure the outer diameter of the surface or bore you need to seal or cover, then select the next size up to allow for trimming. For gasket applications, the disc should overlap the sealing face by at least 2–3mm on each side. Use the diameter options (20mm–150mm) listed in the variant selector above to find your closest match.
A 2mm brass disc is suitable for low-to-medium pressure sealing applications — typically up to a few bar in plumbing or pneumatic fittings — when used with appropriate sealant or compressed between flanged surfaces. For high-pressure hydraulic systems, consult an engineer to confirm suitability for your specific pressure rating.
Brass does not rust (rust is specific to iron-based metals). It may develop a natural patina (darkening or greenish tarnish) over time when exposed to air and moisture, which many makers find desirable. If you need a bright finish, a light polish with a brass cleaner restores the surface. For outdoor or marine environments, a clear lacquer coat is recommended.
Yes. Brass is one of the most machinable metals available. You can drill it with standard HSS drill bits, cut it with metal shears or a rotary tool, file the edges, and engrave it with a rotary engraver or CNC router. Use cutting fluid or light oil when drilling to extend bit life and achieve cleaner holes.
Yes. Brass solders and brazes readily. Use a standard lead-free silver solder with flux for electrical or plumbing joints, or a brass brazing rod for higher-strength structural joins. Clean the surface with fine abrasive paper before soldering to ensure good adhesion.
Each quantity option (1, 2, 4, or 5 pcs) ships the specified number of discs of your chosen diameter. Multi-piece options offer a lower per-unit cost and are ideal when you need spares, are running a small production batch, or want to test multiple finishing techniques on the same blank size.
Absolutely. The unfinished, flat surface is ideal for metal stamping, hand engraving, enameling, and resin inlay. Smaller diameters (20mm–35mm) are popular for pendant blanks and coin-style charms, while larger sizes work well as decorative plates or backing discs for mixed-media art.
