Grade 304 Stainless Steel Sheet — Polished Flat Stock for Fabrication, Repair & DIY Projects
When a repair, fabrication, or custom build calls for flat metal stock that won't rust, warp, or corrode under moisture and everyday wear, most DIYers and tradespeople find themselves hunting for a sheet that actually matches their project dimensions. These Grade 304 stainless steel sheets are stocked in ten panel sizes and seven thickness options so you can order exactly what the job requires — no cutting waste, no oversized offcuts sitting in the corner of the shop.
Each sheet is cut from 304-grade austenitic stainless steel and finished with a smooth polished surface. Panel dimensions range from 100 mm × 100 mm (approx. 3.9" × 3.9") up to 300 mm × 400 mm (approx. 11.8" × 15.7"), and thickness options span 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, and 3 mm. Packs of 1, 2, or 5 pieces are available depending on the variant selected.
Typical applications include HVAC duct patching and backing plates, kitchen splashback inserts, enclosure panels for electrical or plumbing boxes, shim stock for machinery alignment, and decorative inlay work on furniture or cabinetry. The polished finish also makes these sheets a practical choice for stainless steel sheet metal fabrication projects where a clean, reflective surface is part of the finished look.
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Compatibility note: These sheets are uncoated 304 stainless steel and are compatible with standard metal-cutting tools (angle grinder, jigsaw with metal blade, tin snips for thinner gauges). Not recommended for applications requiring magnetic permeability — 304 is non-magnetic in its annealed state.
✅ Key Features of These Grade 304 Stainless Steel Sheets
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📐Ten panel sizes, one order: From 100 × 100 mm to 300 × 400 mm — select the size closest to your project footprint and avoid paying for material you'll cut away.
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📏Seven thickness options (0.3 mm – 3 mm): Thin gauges (0.3–0.5 mm) flex for shim and gasket work; mid-range (0.8–1.5 mm) suits enclosures and splashbacks; heavier gauges (2–3 mm) handle structural backing and load-bearing brackets.
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🛡️304 austenitic alloy — corrosion-resistant: The 18% chromium / 8% nickel composition forms a passive oxide layer that resists rust in humid, wet, and mildly acidic environments without surface treatment.
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✨Polished flat finish: The smooth, reflective surface is ready to use as-is for decorative applications or can be further finished with abrasive pads; no mill scale to remove before painting or bonding.
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📦Flexible pack quantities (1, 2, or 5 pieces): Order a single sheet for a one-off repair or a 5-pack for recurring cuts — quantity options are listed per variant so you only buy what you need.
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🔧Machinable with common shop tools: Sheets up to 1.5 mm can be cut with aviation snips or a jigsaw; 2–3 mm gauges are best handled with an angle grinder or cold saw. Drills cleanly with standard HSS bits and cutting fluid.
📐 Technical Specifications — Stainless Steel Sheet
| Material |
Grade 304 Austenitic Stainless Steel |
| Surface Finish |
Polished (smooth, reflective) |
| Alloy Composition |
~18% Chromium, ~8% Nickel |
| Available Sizes |
100×100 mm, 100×150 mm, 100×200 mm, 150×150 mm, 200×200 mm, 200×300 mm, 200×400 mm, 250×250 mm, 300×300 mm, 300×400 mm |
| Available Thickness |
0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, 3 mm |
| Pack Options |
1 Pc, 2 Pcs, 5 Pcs (see variant options) |
| Tolerance (thickness) |
See variant options |
| Magnetic |
Non-magnetic (annealed 304) |
| Weldability |
Weldable with TIG / MIG using 308L filler |
| Max Continuous Service Temp. |
Typically up to 870 °C (1600 °F) in intermittent service |
| Weight per Sheet |
See variant options |
❓ Frequently Asked Questions
Which thickness should I choose for a kitchen splashback or wall panel?
For decorative wall panels and splashbacks that are bonded or screwed to a flat substrate, 0.5 mm or 0.8 mm is the most practical choice. These gauges are rigid enough to hold their shape once fixed but light enough to cut with aviation snips and to bond with construction adhesive. If the panel will be unsupported over a span wider than about 200 mm, step up to 1 mm to reduce flex.
Is Grade 304 stainless steel strong enough for structural brackets or load-bearing applications?
Grade 304 has a tensile strength of approximately 515 MPa and a yield strength of around 205 MPa, which is adequate for light structural brackets, gussets, and backing plates. For heavy-load or high-stress applications (e.g., lifting hardware or primary structural members), consult an engineer and consider 316 or a thicker gauge. The 2 mm and 3 mm options in this listing are the most suitable for load-bearing DIY uses.
Will these sheets rust or corrode outdoors or in wet environments?
Grade 304 forms a self-repairing chromium oxide passive layer that resists rust in most outdoor and wet environments, including kitchens, bathrooms, and covered exterior applications. It is not fully immune to corrosion in chloride-rich environments (e.g., coastal salt air or direct contact with pool chemicals) — for those conditions, Grade 316 is the recommended upgrade. Avoid prolonged contact with carbon steel tools or surfaces, which can cause surface rust transfer (tea staining).
Can I cut these sheets at home without specialist equipment?
Yes, with the right tool for the gauge. Sheets 0.3–0.5 mm can be scored and snapped or cut with heavy-duty tin snips. Gauges 0.8–1.5 mm work well with a jigsaw fitted with a bi-metal blade (use cutting oil and a slow feed rate). For 2 mm and 3 mm sheets, an angle grinder with a thin stainless-rated cutting disc or a cold saw gives the cleanest edge. Always deburr cut edges with a file or flap disc.
How do I choose between the available panel sizes?
Measure your finished part and add at least 5–10 mm on each edge to allow for cutting and fitting. If your part is, say, 90 mm × 140 mm, the 100 × 150 mm sheet gives you just enough margin. For parts that need to be cut from a larger blank, choose the next size up. Ordering a 5-pack of a smaller size is often more economical than a single large sheet if you need multiple identical pieces.
Are these sheets suitable for use as shim stock or precision spacers?
The thinner gauges (0.3 mm and 0.5 mm) are well-suited for shimming machinery, aligning bearing housings, or spacing components in assemblies. Stainless shim stock is preferred over mild steel in these roles because it resists corrosion and does not compress under moderate clamping loads. For critical tolerance work, verify the actual thickness with a micrometer on receipt, as sheet tolerances can vary slightly by batch.
Can I weld or solder these sheets?
Yes. Grade 304 is readily weldable using TIG or MIG processes with 308L stainless filler wire. Use back-purging with argon on thinner gauges to prevent oxidation on the reverse side. Soldering is possible with stainless-compatible flux and silver-bearing solder, though welding produces a stronger joint. Avoid using standard mild-steel MIG wire, as this will compromise corrosion resistance at the weld zone.
🛒 Select your Size, Thickness, and Amount above, then add to cart.
