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What Is a Steel Flat Bar? 用途, Sizes and Buying Tips
What Is a Steel Flat Bar? 用途, Sizes and Buying Tips
Flat bar (also called flat iron or rectangular bar) is one of the simplest and most useful steel sections: a rectangular strip of steel with no taper, no flanges, just width × thickness × length. It is the starting material for brackets, gussets, machine parts and cutter stock.
Common Grades and Their Uses
炭素鋼 (Q235B / Q355B): the default for indoor brackets, jigs and general fabrication. See our Q235B flat bar.
Stainless (304 / 316L): for food, chemical and coastal environments. See our stainless flat range と 316L flat bar.
アルミニウム (6061 T6): for light-weight structural and machined parts. See our 6061 aluminum flat.
Standard Sizes to Know
| Dimension | Typical Range |
|---|---|
| 幅 | 12 – 200 んん |
| 厚さ | 3 – 100 んん |
| 長さ | 3 – 6 m (cut to size) |
Buying Tips
- Specify the exact width × thickness × length — “平らな棒” without dimensions is ambiguous.
- Ask for black, bright or peeled surface depending on whether you will machine or paint it.
- For machined parts, specify tolerance (h11 or tighter) and confirm mill test certificate.
- Outdoor use: galvanize or specify stainless.
