Grade 304 Stainless Steel Sheet in Bright Polish — Flat Stock for Fabrication, Repair & DIY Projects
When a project demands a flat metal surface that resists rust, holds its shape, and looks clean after cutting, most DIYers and fabricators run into the same wall: finding sheet stock that ships flat, measures true, and doesn't require hours of surface prep. These Grade 304 stainless steel sheets in a bright polish finish are stocked specifically for that gap — whether you're a hobbyist building a custom bracket, a tradesperson patching a surface, or a maker cutting precise blanks for a larger assembly.
Each sheet is 304-grade austenitic stainless steel with a mirror-bright polished surface on one face. Thickness options run from 1mm (~0.039 in) to 3mm (~0.118 in), and sheet dimensions range from 100×100mm (~3.94×3.94 in) up to 300×300mm (~11.81×11.81 in). Packing is available in 1-piece or 2-piece sets depending on the size selected.
Typical use cases include custom splash-back panels, machine guards, shelf reinforcement plates, decorative inlays, and precision blanks for laser or waterjet cutting. The bright polish surface also makes these sheets a practical choice for stainless steel sheet metal fabrication projects where a finished appearance matters without additional polishing labor.
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Compatibility: Suitable for welding (TIG/MIG with 308L filler), drilling, grinding, and cold forming. Compatible with standard stainless fasteners and adhesives rated for 304 SS. Not recommended for chloride-heavy marine environments without additional surface treatment.
✅ Key Features of These Grade 304 Stainless Steel Sheets
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🏗️304 Austenitic Grade
Contains 18% chromium and 8% nickel, giving the alloy its characteristic resistance to oxidation and general corrosion in indoor and light outdoor environments.
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✨Bright Polish Finish
One face carries a reflective bright polish (equivalent to a #8 mirror or #4 brushed-to-mirror finish), reducing the need for post-cut surface work on visible faces.
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📐Multiple Thickness Options
Available in 1mm, 1.5mm, 2mm, and 3mm — covering light-gauge decorative work through structural-grade flat stock in a single product listing.
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📏Range of Sheet Sizes
Sizes from 100×100mm up to 300×300mm let you order the closest blank to your finished part, minimizing offcut waste on small-batch jobs.
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⚙️Machinable & Weldable
304 SS machines cleanly with carbide tooling and accepts TIG and MIG welding. Sheets arrive flat and deburring-ready, with no mill scale to remove.
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📦Flexible Pack Quantities
Order as a single piece or a 2-piece set. Useful for prototyping one-offs or stocking a matched pair for symmetrical builds without over-ordering.
📐 Technical Specifications — Stainless Steel Sheet
| Material |
304 Austenitic Stainless Steel |
| Surface Finish |
Bright Polish (reflective, one face) |
| Thickness Range |
1mm / 1.5mm / 2mm / 3mm (0.039–0.118 in) |
| Sheet Size Range |
100×100mm to 300×300mm (3.94×3.94 in to 11.81×11.81 in) |
| Packing Quantity |
See variant options (1 Pcs or 2 Pcs) |
| Chromium Content |
~18% |
| Nickel Content |
~8% |
| Tensile Strength |
Typically 515–620 MPa (304 grade standard) |
| Hardness |
Typically ≤201 HB (annealed condition) |
| Weldability |
TIG / MIG compatible (use 308L filler) |
| Corrosion Resistance |
Suitable for indoor and light outdoor use; not rated for marine/chloride environments |
| Weight per Sheet |
See variant options (varies by thickness and size) |
❓ Frequently Asked Questions
How do I choose the right thickness for my project?
1mm and 1.5mm sheets are suited for decorative panels, splash-backs, and light-duty covers where rigidity is provided by the surrounding structure. 2mm is a common choice for brackets, guards, and structural plates that need to hold shape under moderate load. 3mm is appropriate when the sheet itself must carry load or resist impact without additional backing.
Is Grade 304 stainless steel strong enough for structural use?
304 SS has a tensile strength of approximately 515–620 MPa and a yield strength around 205 MPa, which is adequate for many light structural applications such as brackets, gussets, and reinforcement plates. For load-bearing structural members, consult an engineer to confirm the gauge and size meet your specific load requirements.
Will these sheets rust or corrode outdoors?
Grade 304 resists oxidation and general atmospheric corrosion well in most indoor and sheltered outdoor settings. However, it is not recommended for direct exposure to saltwater, chlorinated water, or coastal environments without additional surface treatment. For those conditions, 316-grade stainless steel is a better choice.
Can I cut these sheets with standard tools?
Yes. 1mm and 1.5mm sheets can be cut with aviation snips, angle grinders with a stainless-rated disc, or a jigsaw with a bi-metal blade. 2mm and 3mm sheets are best cut with an angle grinder, cold saw, or plasma cutter. Always use cutting fluid when drilling to extend bit life and prevent work-hardening at the cut edge.
Are these sheets compatible with TIG and MIG welding?
Yes. 304 stainless steel is readily weldable by TIG and MIG processes. Use 308L filler wire for best results. Avoid using carbon steel wire or tools that have contacted carbon steel, as cross-contamination can cause surface rust at the weld zone. Back-purging with argon is recommended for full-penetration welds on thinner gauges.
What size should I order if my finished part is slightly smaller than a listed sheet?
Order the next size up from your finished part dimensions to allow for saw kerf, edge cleanup, and any layout margin. For example, if your finished part is 90×90mm, the 100×100mm sheet gives you approximately 5mm of margin on each edge — enough for most cutting and deburring operations.
Do the sheets arrive flat, or do I need to flatten them before use?
These sheets are cut from flat-rolled stock and are packaged to maintain flatness in transit. Minor handling bow can occur on thinner gauges (1mm) over larger sheet sizes; this typically self-corrects when the sheet is clamped or fastened in place. If dead-flat tolerance is critical, a light pass on a surface plate or press is recommended before precision layout work.
How do I decide between ordering 1 Pcs or 2 Pcs?
The 2-piece option is useful when you need a matched pair for symmetrical builds (e.g., two side panels, two mounting plates) or want a spare in case of a cutting error. The 1-piece option suits single-part prototypes or situations where you only need one finished piece and want to minimize material cost.
🛒 Select your Material, Size, and Packing Quantity above, then add to cart.
