304 Stainless Steel Round Disc Blanks — Precision-Cut Sheet Metal for DIY Fabrication & Craft Projects
When a project demands a flat, corrosion-resistant metal blank that holds its shape under load, most hardware-store options fall short — they rust, warp, or arrive with rough edges that require hours of finishing. These 304 stainless steel disc blanks are designed for makers, fabricators, and home-improvement enthusiasts who need a reliable starting point without the machine-shop lead time.
Each disc is cut from 304-grade stainless steel sheet and is available in outer diameters of 50 mm (≈2"), 100 mm (≈4"), 150 mm (≈6"), 200 mm (≈8"), 250 mm (≈10"), 300 mm (≈12"), and 350 mm (≈14"), with thickness options ranging from 0.5 mm to 5 mm. Quantities per order are selectable as 1, 2, or 4 pieces, making it easy to buy exactly what a job requires.
Typical applications include backing plates for welding fixtures, custom gasket blanks for plumbing and HVAC repairs, decorative medallions for metalwork and signage, and protective cover discs for outdoor installations where long-term weather resistance is essential.
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Compatibility: Suitable for use with standard metalworking tools including angle grinders, drill presses, and TIG/MIG welders. Compatible with most stainless-rated cutting fluids and abrasives.
✅ Key Features of These 304 Stainless Steel Round Disc Blanks
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304-Grade Corrosion Resistance
The 18/8 chromium-nickel composition of 304 stainless steel forms a passive oxide layer that resists rust, staining, and oxidation in both indoor and outdoor environments — no coating or plating required.
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Wide Size Matrix
Seven diameter options (50–350 mm) combined with up to ten thickness options (0.5–5 mm) give you a broad selection matrix to match structural, decorative, or sealing requirements without custom fabrication.
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Clean-Cut Edges
Discs are cut to a consistent round profile. Edges are suitable for direct use in many applications and can be further deburred or polished with standard stainless abrasives if a mirror finish is needed.
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Flexible Quantity Options
Order 1, 2, or 4 pieces per variant to match your project scope — whether you need a single prototype blank or a small batch for a production run.
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Weldable & Machinable
304 stainless is readily TIG and MIG weldable and can be drilled, tapped, or milled with carbide tooling. Discs serve as ready-to-machine blanks for flanges, brackets, and custom hardware.
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Temperature & Chemical Stability
Rated for continuous service up to approximately 870 °C (1,600 °F) in non-sulfurous atmospheres. Resistant to many mild acids, alkalis, and cleaning agents encountered in food-service and industrial settings.
📐 Technical Specifications — Stainless Steel Round Disc Blanks
| Material |
304 Stainless Steel (18/8 Cr-Ni alloy) |
| Shape |
Round disc / flat blank |
| Outer Diameter |
50 mm, 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, 350 mm — see variant options |
| Thickness |
0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 4 mm, 5 mm — see variant options |
| Quantity per Order |
1 Pcs, 2 Pcs, or 4 Pcs — see variant options |
| Surface Finish |
Mill finish (2B-equivalent); suitable for further polishing |
| Tensile Strength |
Typically 515–720 MPa (ASTM A240 reference) |
| Yield Strength |
Typically ≥205 MPa |
| Hardness |
Typically ≤92 HRB (annealed condition) |
| Max Continuous Service Temp. |
~870 °C (1,600 °F) in non-sulfurous atmosphere |
| Inner Diameter / Hole |
Solid blank (no center hole); drilling by end user |
| Weight |
See variant options (varies by diameter and thickness) |
❓ Frequently Asked Questions
How do I choose the right diameter for my project?
Measure the opening or surface area you need to cover or reinforce, then select the next size up to allow for edge finishing or drilling. For example, if you need a 95 mm cover plate, the 100 mm disc gives you a 2.5 mm margin on each side for a clean fit after deburring.
Which thickness should I choose for structural versus decorative use?
For purely decorative applications such as signage or medallions, 0.5–1 mm is typically sufficient and keeps weight low. For load-bearing or structural uses — backing plates, flanges, or cover discs subject to mechanical stress — 2 mm and above is recommended. Consult a structural engineer for safety-critical applications.
Will these discs rust outdoors?
304 stainless steel forms a self-healing chromium oxide layer that resists rust in most outdoor environments. However, in coastal or high-chloride environments (salt spray, de-icing salts), surface staining or pitting can occur over time. For marine or highly corrosive settings, 316-grade stainless is generally preferred.
Are these discs compatible with standard drill bits?
Standard HSS (high-speed steel) drill bits can cut 304 stainless, but cobalt or carbide-tipped bits are recommended for cleaner holes and longer tool life. Use a cutting fluid, keep drill speed moderate, and apply steady pressure to avoid work-hardening the surface.
Can I weld these discs to mild steel or other stainless parts?
Yes. 304 stainless is readily TIG and MIG weldable. When welding to mild steel, use a 309L filler rod to bridge the dissimilar metals. For stainless-to-stainless joints, 308L filler is the standard choice. Post-weld passivation is recommended to restore full corrosion resistance in the heat-affected zone.
How do I decide between ordering 1, 2, or 4 pieces?
The 1-piece option suits prototyping or single-repair jobs. The 2-piece option is useful when you need a spare or are making a matched pair (e.g., two end caps). The 4-piece option offers the best per-unit value for small production runs or projects requiring multiple identical blanks.
What is the flatness tolerance of these discs?
Flatness varies by thickness — thinner gauges (0.5–1 mm) may exhibit minor bow from the cutting process, while thicker discs (2 mm and above) are generally flat within typical sheet metal tolerances. If your application requires certified flatness, contact us to confirm specifications before ordering.
🛒 Select your Diameter, Thickness, and Amount above, then add to cart.
