Stainless Steel Round Disc Blanks A2 Grade — Laser Cut Metal Circles, 3mm–150mm

Match the diameter to your application's bore or surface requirement. For reference, 25mm is approximately 1" and 50mm is approximately 2". For thickness: 0.1–0.3mm discs are generally used for shims, gaskets, and decorative overlays; 0.5–1mm discs are typically suited for structural spacers, tags, and craft blanks; 1.5–2mm discs are generally chosen for heavier-duty applications. When in doubt, size up — you can always trim or sand down.

These discs are A2 stainless steel, which is the ISO designation equivalent to AISI 304 grade — one of the most widely used austenitic stainless steel alloys. A2 offers good corrosion resistance, is non-magnetic in its annealed state, and is generally suitable for both indoor and light outdoor use. It is not the same as A4 (316), which is recommended for marine or highly corrosive environments.

A2 (304) stainless steel resists rust well in most outdoor environments, including rain, humidity, and mild atmospheric exposure. It is generally suitable for sheltered outdoor applications, garden projects, and general weatherproofing. For prolonged saltwater or coastal exposure, A4 (316) grade is typically recommended. These discs are not coated or plated, so the corrosion resistance comes from the alloy itself.

Yes. Thinner variants (0.1–0.3mm) can typically be cut with metal shears, a rotary tool, or a craft knife on a cutting mat. Thicker discs (0.5mm and above) are generally drilled with HSS or cobalt drill bits using cutting fluid to prevent work-hardening. Laser engraving and hand metal stamping are also commonly used on these blanks. The clean laser-cut edge means minimal finishing is needed before further processing in most cases.

No — these are blank flat discs with no pre-drilled holes or threads. They are designed to be used as-is (for shims, gaskets, tags, or craft blanks) or to be drilled and tapped to your own specification. Once you drill your own hole, they are compatible with both metric and imperial fastener systems.

These discs are laser-cut for consistent roundness and a clean perimeter. Thinner discs (0.1–0.3mm) are generally very flat with minimal burr. Slightly thicker discs may have a fine laser oxide line on the cut edge, which can typically be removed with light sanding or a deburring tool if a polished finish is required. Dimensional tolerances are generally within ±0.1–0.2mm, though we recommend confirming critical dimensions on receipt for precision engineering applications.

Common applications include: precision shims and spacers in automotive, HVAC, and machinery maintenance; gasket blanks for plumbing and pipe fittings; jewelry and craft blanks for hand-stamping, laser engraving, or resin work; protective washers under bolt heads; decorative inlays in woodworking; name tags and ID discs; and electrical or thermal insulation spacers. The wide diameter range (3mm to 150mm) makes these metal circle blanks versatile across DIY, engineering, and artistic projects.

Here are some quick reference conversions for common diameters in this listing: 3mm ≈ 1/8", 6mm ≈ 1/4", 10mm ≈ 3/8", 12mm ≈ 1/2", 16mm ≈ 5/8", 19mm ≈ 3/4", 25mm ≈ 1", 50mm ≈ 2", 100mm ≈ 4", 150mm ≈ 6". For thickness: 0.5mm ≈ 0.020", 1mm ≈ 0.039", 2mm ≈ 0.079".