304 Stainless Steel Flat Bar Metal Plate Strip Width 10mm-80mm Thick 3mm to 20mm

Start with the load or span your flat bar needs to support. For light brackets and trim work, widths of 10–20 mm with 3–5 mm thickness are typically sufficient. For structural gussets or heavy-duty mounting plates, consider widths of 40–80 mm and thickness of 8–20 mm. Use the Size variant selector above to pick the exact combination — the format is Thickness × Width × Length (e.g., 【304】5x30x200mm means 5 mm thick, 30 mm wide, 200 mm long).

304 stainless steel has a typical tensile strength of 515–720 MPa and a yield strength around 205 MPa, making it suitable for light-to-medium structural applications such as brackets, frames, and support gussets. For heavy structural loads or high-stress environments, consult an engineer and consider thicker sections or a higher-grade alloy.

304 stainless steel forms a self-healing passive chromium oxide layer that resists rust and staining in most outdoor and humid environments. It performs well in rain, moisture, and mild chemical exposure. For highly saline environments (e.g., coastal or marine applications with direct saltwater contact), 316 stainless steel offers superior chloride resistance. For general outdoor DIY use, 304 is an excellent choice.

Yes. 304 stainless steel can be MIG or TIG welded using ER308L filler wire. It can be drilled with HSS or cobalt drill bits (use cutting fluid and low speed), cut with an angle grinder fitted with a stainless-rated disc, or cold-sawn with a bi-metal blade. Avoid using carbon steel tools that may leave embedded particles and cause surface rust.

The variant name follows the format 【304】Thickness × Width × Length in millimeters. For example, 【304】4x20x200mm means: 304 stainless steel, 4 mm thick, 20 mm wide, 200 mm long. Use the Size dropdown to select your exact dimensions, then confirm the Length and Amount options before adding to cart.

Yes — a flat bar, metal plate strip, and bar stock all refer to rectangular cross-section stainless steel pieces. The terms are used interchangeably in the DIY and fabrication community. This product is ideal when you need a flat, straight piece of stainless steel in a specific width, thickness, and length for cutting, bending, or direct use as a structural or decorative element.

Each listing is priced per piece (1 pc). To order multiple pieces of the same size, simply increase the quantity in your cart. For bulk or custom-length orders beyond the listed sizes, please contact us through the store's contact page and we'll be happy to assist.