304 A2 Stainless Steel Flat Bar Strip — Corrosion-Resistant Metal Plate for DIY & Fabrication
When a repair bracket rusts through, a shelf support bends, or a custom fabrication project demands a material that holds its shape and finish over time, the right flat bar makes all the difference. DIY builders, metalworkers, and maintenance professionals who need a reliable, weldable, and corrosion-resistant stock material will find these 304 A2 stainless steel flat bar strips a practical fit for a wide range of structural and decorative tasks.
Each piece is cut from 304-grade (A2) austenitic stainless steel — one of the most widely used corrosion-resistant alloys — and supplied in a fixed 200mm (approx. 7.87 in) length. Thickness ranges from 3mm to 20mm (~0.12–0.79 in) and width from 10mm to 80mm (~0.39–3.15 in), with the exact cross-section determined by the variant selected. The surface finish is a standard mill or lightly brushed finish consistent with commercial flat bar stock.
Typical applications include fabricating mounting brackets and support gussets, creating custom spacers or shims in machinery, reinforcing timber or composite structures, building small enclosures or frames, and general metalworking projects where a short, precise-length stainless flat section is needed. The 200mm length suits bench-top prototyping, repair inserts, and component-level fabrication without requiring further cutting in many cases.
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Compatibility note: These flat bars are unthreaded solid stock. They are compatible with standard metalworking, welding, drilling, and cutting tools rated for stainless steel. Verify cross-section dimensions against your design tolerances before ordering.
✅ Key Features of These 304 A2 Stainless Steel Flat Bar Strips
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304 / A2 Grade Stainless Steel
Manufactured from 304 austenitic stainless steel (equivalent to A2 designation), offering solid resistance to oxidation, moisture, and many common chemicals — suitable for both indoor and outdoor use in non-marine environments.
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Wide Cross-Section Range
Available in thickness × width combinations from 3mm × 10mm up to 20mm × 80mm, covering a broad spectrum of structural and decorative requirements. Select the exact cross-section from the variant options above.
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Fixed 200mm Length
Each bar is supplied at a consistent 200mm (7.87 in) length — a practical size for brackets, inserts, spacers, and short-run fabrication without needing to cut down longer stock.
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Machinable & Weldable
304 stainless flat bar can be drilled, tapped, milled, bent (with appropriate tooling), and welded using standard TIG or MIG processes. Work-hardens under cold forming — anneal if extensive bending is required.
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Flexible Quantity Options
Order as a single piece to test fit, or select 5-piece or 10-piece packs for project runs and stock. Pricing scales with quantity, making multi-piece orders more economical per unit.
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Consistent Mill Dimensions
Flat bar dimensions conform to standard commercial tolerances for hot-rolled or cold-drawn stainless flat stock. Thickness and width are as specified in the variant; minor surface variation is normal for mill-finish material.
📐 Technical Specifications — Stainless Steel Flat Bar
| Material Grade |
304 Stainless Steel (A2 equivalent) |
| Alloy Type |
Austenitic stainless steel |
| Length |
200mm (approx. 7.87 in) |
| Thickness |
3mm – 20mm (see variant options) |
| Width |
10mm – 80mm (see variant options) |
| Surface Finish |
Mill finish / lightly brushed (commercial standard) |
| Tensile Strength (typical) |
515 MPa min (ASTM A276 / EN 10088 reference) |
| Yield Strength (typical) |
205 MPa min |
| Hardness (typical) |
≤ 201 HB (annealed condition) |
| Magnetic |
Slightly magnetic when cold-worked; non-magnetic when annealed |
| Weldability |
Good — TIG / MIG with 308L filler recommended |
| Quantity per Order |
See variant options (1 Pcs / 5 Pcs / 10 Pcs) |
| Product Form |
Solid flat bar (unthreaded, undrilled) |
❓ Frequently Asked Questions
How do I choose the right thickness and width for my project?
Start with the load or span your bar needs to support. For light-duty brackets or decorative trim, 3mm–5mm thickness is typically sufficient. For structural gussets, shelf supports, or load-bearing brackets, 6mm–10mm or thicker is more appropriate. Width should match your fastener pattern or overlap requirement. When in doubt, size up — it is easier to remove material than to add it.
Is 304 stainless steel strong enough for structural use?
304 stainless steel has a minimum tensile strength of approximately 515 MPa and yield strength of 205 MPa, which is adequate for many light-to-medium structural applications such as brackets, frames, and supports. For heavy structural or high-stress applications, consult an engineer and consider whether a higher-strength grade (e.g., 316 or duplex) is more appropriate.
Will these bars rust or corrode outdoors?
304 stainless steel forms a passive chromium oxide layer that resists rust in most atmospheric and freshwater environments. It performs well in dry and moderate-humidity outdoor settings. However, it is not ideal for marine (saltwater) environments or exposure to chloride-rich chemicals — for those conditions, 316-grade stainless is recommended. Periodic cleaning helps maintain the passive layer.
Can I weld, drill, or cut these flat bars?
Yes. 304 stainless flat bar can be drilled with cobalt or carbide-tipped bits (use cutting fluid and moderate speed), cut with an angle grinder or cold saw fitted with stainless-rated blades, and welded using TIG or MIG with 308L filler wire. Avoid using carbon steel tools that may leave embedded particles causing surface rust. Work-hardening occurs during cold forming, so anneal the piece if extensive bending is needed.
Are these bars compatible with standard fasteners and hardware?
Yes — these are solid undrilled flat bars, so you drill your own holes to match any standard metric or imperial fastener pattern. For best corrosion compatibility, use A2 or A4 stainless steel bolts, nuts, and washers rather than zinc-plated or carbon steel fasteners, which can cause galvanic corrosion at the contact point.
Should I order 1 Pcs, 5 Pcs, or 10 Pcs?
Order 1 Pcs if you need a single piece for a repair or prototype. Choose 5 Pcs or 10 Pcs if you are building multiple identical brackets, running a small production batch, or want spares on hand. The per-unit cost decreases with larger quantity options, so multi-piece packs offer better value for project work.
What is the difference between 304 and 316 stainless steel flat bar?
Both are austenitic stainless steels with similar mechanical properties. The key difference is that 316 contains molybdenum, which significantly improves resistance to chlorides and marine environments. For most indoor, general outdoor, and non-marine applications, 304 (A2) is the standard and more cost-effective choice. If your application involves saltwater, swimming pools, or chemical exposure, 316 (A4) is the safer option.
🛒 Select your Thickness × Width and Amount above, then add to cart.
