A2 304 Stainless Steel Round Plate Circular Sheet Disc Disk Thickness 1-4mm

Select a diameter that covers the bore or fastener head you need to span, then choose a thickness equal to the gap you need to fill. For example, a 10 mm diameter disc at 1 mm thickness works well as a thin spacer behind an M8 bolt head. If you are unsure, order a small pack of two or three sizes to test fit before committing to a larger quantity.

304 stainless steel has a tensile strength typically in the range of 515–620 MPa, which is broadly comparable to low-carbon mild steel. However, 304 stainless work-hardens more readily, so it can become harder to machine after initial cutting. For structural load-bearing applications, verify the specific strength requirements against your engineering specification.

A2 / 304 stainless steel resists rust and surface oxidation well in most outdoor environments, including rain and humidity. It is not fully immune to corrosion in coastal or high-chloride environments — for those conditions, A4 / 316 grade is generally recommended. In typical garden, workshop, or light industrial settings, 304 performs reliably without surface treatment.

These are unthreaded flat blanks, not standard washers with a centre hole. They are not designed to slide over a bolt shank. If you need a washer with a centre bore, please check our washer listings. These discs are intended as solid backing plates, shims, inlays, or blanks for further machining where you drill your own hole to the required size.

Yes. 304 stainless steel is readily TIG and MIG welded using 308L filler wire. It can also be brazed with silver-based alloys. Standard soft soldering is less effective on stainless without appropriate flux. Always clean the surface with acetone or isopropyl alcohol before welding to remove any oils or contaminants that could cause porosity in the weld.

Small packs (5–20 pieces) suit one-off repairs, prototyping, or testing a size before a larger commitment. Medium packs (40–80 pieces) work well for workshop stock or recurring maintenance tasks. Large packs (160–400 pieces) offer the lowest per-piece cost and are suited to production runs, batch fabrication, or resale. The price per piece decreases as pack size increases, so calculate your expected usage over 3–6 months to find the most cost-effective option.

The mill finish is smooth but may carry light machining oils. Before painting, powder coating, or applying adhesive, degrease the surface with acetone or a dedicated metal cleaner. For powder coating, a light abrasive blast or scuff with 120-grit abrasive paper improves adhesion. Stainless steel does not require a rust-inhibiting primer, but an etch primer improves paint adhesion on the passive oxide layer.