Stainless Steel Blank Round Disc 304 Grade Metal Sheet Plate Ø18-30mm Thick 1-5m

304 stainless contains ~18% chromium and ~8% nickel, making it corrosion-resistant in most indoor and mildly humid environments. 316 adds molybdenum for enhanced resistance to chlorides and salt water. For general DIY, fabrication, and non-marine applications, 304 is the practical and cost-effective choice. If your project involves prolonged salt-water or chemical exposure, consider 316-grade stock instead.

No — these are solid, undrilled flat blanks. They are intended as raw stock for you to drill, punch, engrave, or use as-is for shim and spacer applications. If you need a centre hole or specific bore, you will need to machine it yourself or have it done locally.

Measure the outer diameter your application requires (the disc must fit within or over the mating part) and the thickness needed for structural or sealing purposes. Diameters run from 18 mm to 30 mm in 1–2 mm increments; thicknesses from 1 mm to 5 mm. For shim applications, thinner discs (1–1.5 mm) are typical; for structural spacers or backing plates, 2–4 mm is more common. When in doubt, order one size up — it is easier to reduce diameter than to add material.

Yes. 304 stainless is readily TIG and MIG welded using 308L filler rod. It can also be silver-soldered with appropriate flux. Avoid standard tin-lead solder, which does not bond reliably to stainless. After welding, passivation or pickling is recommended to restore the corrosion-resistant surface layer in the heat-affected zone.

304 stainless performs well in covered outdoor environments and resists rust in most ambient conditions. However, it is not fully immune to surface staining in coastal or high-chloride environments over extended periods. For prolonged outdoor or marine exposure, 316-grade stainless is the more appropriate choice. Keeping the surface clean and dry extends service life significantly.

For drilling, use HSS-Co (cobalt) or carbide-tipped drill bits with cutting fluid and a slow, steady feed rate — stainless work-hardens quickly if you rush. For cutting or trimming the outer edge, an angle grinder with a stainless-rated cutting disc or a metal-cutting bandsaw works well. Always use PPE (eye protection, gloves) when machining stainless steel.

Pack quantity depends on the size variant selected. Smaller diameters (18–20 mm) in thinner gauges are available in packs of 10. Mid-range sizes typically ship in packs of 5. Larger diameters or thicker variants (e.g., 26–30 mm at 4–5 mm thick) are sold in packs of 2. The exact quantity is shown in the Qty(pcs) option selector on this page.