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When your project demands a flat, corrosion-resistant metal blank that fits exactly where you need it, sourcing the right disc in the right thickness can be a frustrating bottleneck. Whether you are a fabricator, hobbyist, or maintenance engineer, these galvanised steel round blank discs eliminate the guesswork by offering a wide matrix of diameters and thicknesses in one listing.
Each disc is cut from mild steel sheet and finished with a zinc-plating (galvanised) coating. Diameters range from 50 mm (approx. 2 in) to 300 mm (approx. 11.8 in), and thickness options span 0.5 mm to 3 mm (approx. 0.02 in to 0.12 in). The zinc layer provides a bright, smooth surface that resists surface oxidation under normal indoor and light outdoor conditions.
Typical applications include blanking off pipe ends and conduit openings, creating custom gasket templates, fabricating backing plates for welding fixtures, producing decorative metalwork blanks for etching or painting, and use as shim stock in mechanical assemblies requiring precise gap control.
The electroplated zinc coating forms a sacrificial barrier that protects the underlying steel from surface rust, extending service life in workshop and light outdoor environments.
Diameters from 50 mm to 300 mm paired with thicknesses from 0.5 mm to 3 mm give you precise control over weight, rigidity, and fit without custom cutting.
Discs are blanked (die-cut) from sheet stock, producing consistent circular profiles with edges that are ready for deburring, grinding, or direct use in low-stress applications.
The mild steel substrate drills, taps, and welds readily with standard tooling, making these blanks a versatile starting point for custom parts and fixtures.
Available in packs of 1, 2, 3, or 5 pieces depending on the size selected, so you can order exactly what your project requires without excess stock.
Accepts MIG and TIG welding (after light surface prep), powder coating, spray painting, and mechanical fastening, giving you full flexibility over your finishing workflow.
| Material | Mild steel (low-carbon steel) with zinc-plating (galvanised) |
|---|---|
| Surface Finish | Electroplated zinc (bright galvanised) |
| Diameter Range | 50 mm – 300 mm (approx. 2 in – 11.8 in) |
| Thickness Range | 0.5 mm – 3 mm (approx. 0.02 in – 0.12 in) |
| Shape | Round / circular blank disc |
| Edge Condition | Blanked; minor burr may be present — light deburring recommended |
| Coating Thickness | See variant options |
| Tensile Strength | Typically 330–430 MPa (mild steel grade) |
| Hardness | Typically 120–160 HB |
| Pack Quantity | 1 / 2 / 3 / 5 pcs (varies by size — see variant options) |
| Hole / Centre Bore | None (solid blank) |
| Application | Fabrication, blanking, shim stock, decorative metalwork, welding fixtures |
Select the diameter that matches or slightly exceeds the opening or surface area you need to cover or fill. For thickness, thinner discs (0.5–1 mm) suit shim stock, gasket templates, and decorative work, while thicker discs (1.5–3 mm) are better for structural blanking plates, welding fixtures, and load-bearing applications. Use the Size (Diameter × Thickness) selector above to find your combination.
The mild steel core has a typical tensile strength of 330–430 MPa, which is adequate for light structural blanking and backing plate applications. For high-pressure or safety-critical uses, always verify the specific load requirements against the disc dimensions and consult a qualified engineer.
The electroplated zinc coating provides good resistance to surface rust in dry indoor environments and light outdoor exposure. It is not suitable for continuous immersion in water, acids, or salt-spray environments without an additional topcoat such as powder coating or paint. For harsh outdoor use, consider applying a compatible primer and topcoat after any machining or welding.
It is strongly recommended to grind or sand off the zinc coating in the weld zone before welding. Burning zinc produces zinc oxide fumes that are hazardous to health. Work in a well-ventilated area and use appropriate respiratory protection. After welding, the bare steel area can be re-primed or painted to restore corrosion protection.
Yes. The galvanised surface accepts powder coating and spray paint well after proper surface preparation. Clean the disc with a degreaser, lightly abrade the surface with fine-grit sandpaper or a scuff pad, and apply a zinc-compatible primer before your topcoat for best adhesion and durability.
Pack quantity varies by size combination and is shown in the Pack Qty option selector. Smaller and thinner discs are typically available in packs of 2–5 pieces, while larger and thicker discs are available in packs of 1–3 pieces. Select your preferred Size (Diameter × Thickness) first, then choose your Pack Qty from the available options.
Yes. The mild steel core machines readily with standard HSS or cobalt drill bits and taps. Use cutting fluid to extend tool life and achieve cleaner holes. For tapping, select a drill size appropriate to your thread specification and deburr the hole before threading.
