# Steel flat bar and hex bar stock sizes: A36 hot rolled flat 1/8 to 3/8 in, 1018 hex 1/4 to 2 in and 5 to 18 mm across flats

> What sizes does steel flat bar and hex bar come in, and what does each weigh per foot?

- Category: Hardware › Materials & stock
- Kind: Standard part
- Basis: Continental Steel (A36 flat bar list, first 25 sizes), Online Metals (flat 3/8 x 3; 1018 hex inch and metric sizes), Metals Depot (1018 hex with lb/ft and lengths)
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**Exact dimensions.** True size, with no tolerance added.

## Notes

- Hex bar is sized by its width across flats (AF). Distributor tables: Metals Depot (C1018 cold finished hexagon, ASTM A108, AISI 1018: 12 sizes with lb/ft; lengths 2, 4, 6, 12 ft or cut to size) and Online Metals (same grade: 16 inch sizes from 1/4 to 2 in, and 9 metric sizes 5 to 18 mm in 60 in lengths; 25 of 30 listings were visible). Weights come only from Metals Depot. A 1-5/16 in size is listed by Online Metals without an across-flats value; it is shown from its name.
- Flat bar: Continental Steel's hot rolled flat bar list (A36, square edge, 20 ft lengths) has 280 sizes; only the first 25 were readable, all 1/8 in and 3/16 in thick. Rows below are those, plus Online Metals' 3/8 x 3 in (3.84 lb/ft). Continental's page has two apparent typos: 1/8 x 1 is printed 4.250 lb/ft (its own 20 ft weight, 8.50 lb, gives 0.425, which is used) and 3/16 x '1 5/8' has the decimal 1.375 and the weight of a 1-3/8 in bar, so that row is omitted. Steel weighs about 3.4 lb per foot per square inch of section, which reproduces the listed weights to rounding.
- Most distributors cut flat bar to length; Online Metals states custom cuts up to 240 in. Other widths and thicknesses (1/4, 3/8, 1/2 in and up to 12 in wide) exist in the 280-size list but were not readable.
- Aluminum and stainless flat bar are on their own pages (aluminum-flat-bar-and-round-bar-sizes, stainless-steel-round-and-flat-bar-sizes); round and square steel bar on bar-stock-sizes-round-square-steel-aluminum.
- No files: a flat bar is a rectangle and a hex bar a prism, which a table already describes at every size and length.

## Sizes

| shape | size | decimal, in | mm | weight, lb/ft | source |
|---|---|---|---|---|---|
| hex 1018 cold finished | 1/4 in AF | 0.2500 | 6.35 | 0.20 | Online Metals + Metals Depot |
| hex 1018 cold finished | 5/16 in AF | 0.3125 | 7.94 | 0.30 | Online Metals + Metals Depot |
| hex 1018 cold finished | 3/8 in AF | 0.3750 | 9.52 | 0.42 | Online Metals + Metals Depot |
| hex 1018 cold finished | 7/16 in AF | 0.4375 | 11.11 | 0.60 | Online Metals + Metals Depot |
| hex 1018 cold finished | 1/2 in AF | 0.5000 | 12.70 | 0.74 | Online Metals + Metals Depot |
| hex 1018 cold finished | 5/8 in AF | 0.6250 | 15.88 | 1.15 | Online Metals + Metals Depot |
| hex 1018 cold finished | 11/16 in AF | 0.6875 | 17.46 | 1.39 | Online Metals + Metals Depot |
| hex 1018 cold finished | 3/4 in AF | 0.7500 | 19.05 | 1.66 | Online Metals + Metals Depot |
| hex 1018 cold finished | 7/8 in AF | 0.8750 | 22.22 | 2.25 | Online Metals + Metals Depot |
| hex 1018 cold finished | 1 in AF | 1.0000 | 25.40 | 2.94 | Online Metals + Metals Depot |
| hex 1018 cold finished | 1-1/8 in AF | 1.1250 | 28.57 | 3.75 | Online Metals + Metals Depot |
| hex 1018 cold finished | 1-1/4 in AF | 1.2500 | 31.75 | — | Online Metals |
| hex 1018 cold finished | 1-5/16 in AF | 1.3125 | 33.34 | — | Online Metals |
| hex 1018 cold finished | 1-1/2 in AF | 1.5000 | 38.10 | — | Online Metals |
| hex 1018 cold finished | 1-3/4 in AF | 1.7500 | 44.45 | — | Online Metals |
| hex 1018 cold finished | 2 in AF | 2.0000 | 50.80 | 12.00 | Online Metals + Metals Depot |
| hex 1018 cold finished | 5 mm AF | 0.1969 | 5 | — | Online Metals (60 in length) |
| hex 1018 cold finished | 6 mm AF | 0.2362 | 6 | — | Online Metals (60 in length) |
| hex 1018 cold finished | 7 mm AF | 0.2756 | 7 | — | Online Metals (60 in length) |
| hex 1018 cold finished | 8 mm AF | 0.3150 | 8 | — | Online Metals (60 in length) |
| hex 1018 cold finished | 10 mm AF | 0.3937 | 10 | — | Online Metals (60 in length) |
| hex 1018 cold finished | 12 mm AF | 0.4724 | 12 | — | Online Metals (60 in length) |
| hex 1018 cold finished | 13 mm AF | 0.5118 | 13 | — | Online Metals (60 in length) |
| hex 1018 cold finished | 15 mm AF | 0.5906 | 15 | — | Online Metals (60 in length) |
| hex 1018 cold finished | 18 mm AF | 0.7087 | 18 | — | Online Metals (60 in length) |
| flat bar A36 hot rolled | 1/8 x 1/2 in | 0.1250 x 0.5000 | 3.17 x 12.70 | 0.213 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 5/8 in | 0.1250 x 0.6250 | 3.17 x 15.88 | 0.266 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 3/4 in | 0.1250 x 0.7500 | 3.17 x 19.05 | 0.319 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 1 in | 0.1250 x 1.0000 | 3.17 x 25.40 | 0.425 | Continental Steel (page prints 4.250; its 20 ft weight gives 0.425) |
| flat bar A36 hot rolled | 1/8 x 1-1/4 in | 0.1250 x 1.2500 | 3.17 x 31.75 | 0.531 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 1-3/8 in | 0.1250 x 1.3750 | 3.17 x 34.92 | 0.478 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 1-1/2 in | 0.1250 x 1.5000 | 3.17 x 38.10 | 0.638 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 1-3/4 in | 0.1250 x 1.7500 | 3.17 x 44.45 | 0.744 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 2 in | 0.1250 x 2.0000 | 3.17 x 50.80 | 0.85 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 2-1/2 in | 0.1250 x 2.5000 | 3.17 x 63.50 | 1.06 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 3 in | 0.1250 x 3.0000 | 3.17 x 76.20 | 1.28 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 4 in | 0.1250 x 4.0000 | 3.17 x 101.60 | 1.7 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 5 in | 0.1250 x 5.0000 | 3.17 x 127.00 | 2.13 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 6 in | 0.1250 x 6.0000 | 3.17 x 152.40 | 2.55 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 7 in | 0.1250 x 7.0000 | 3.17 x 177.80 | 2.98 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 8 in | 0.1250 x 8.0000 | 3.17 x 203.20 | 3.4 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 10 in | 0.1250 x 10.0000 | 3.17 x 254.00 | 4.25 | Continental Steel |
| flat bar A36 hot rolled | 1/8 x 12 in | 0.1250 x 12.0000 | 3.17 x 304.80 | 5.1 | Continental Steel |
| flat bar A36 hot rolled | 3/16 x 1/2 in | 0.1875 x 0.5000 | 4.76 x 12.70 | 0.319 | Continental Steel |
| flat bar A36 hot rolled | 3/16 x 5/8 in | 0.1875 x 0.6250 | 4.76 x 15.88 | 0.398 | Continental Steel |
| flat bar A36 hot rolled | 3/16 x 3/4 in | 0.1875 x 0.7500 | 4.76 x 19.05 | 0.478 | Continental Steel |
| flat bar A36 hot rolled | 3/16 x 1 in | 0.1875 x 1.0000 | 4.76 x 25.40 | 0.638 | Continental Steel |
| flat bar A36 hot rolled | 3/16 x 1-1/4 in | 0.1875 x 1.2500 | 4.76 x 31.75 | 0.797 | Continental Steel |
| flat bar A36 hot rolled | 3/16 x 1-1/2 in | 0.1875 x 1.5000 | 4.76 x 38.10 | 0.956 | Continental Steel |
| flat bar A36 hot rolled | 3/8 x 3 in | 0.3750 x 3.0000 | 9.52 x 76.20 | 3.84 | Online Metals |

## Where the files are

- Continental Steel & Tube: [Hot rolled flat bar (A36, square edge, 20 ft): first 25 of 280 listed sizes with lb/ft](https://continentalsteel.com/viewitems/steel-bars/hot-rolled-flat-bar) — web — Publisher's page; dimensions are facts
- Online Metals: [0.375 x 3 in A36 hot rolled flat bar: 3.84 lb per foot, custom cuts to 240 in](https://www.onlinemetals.com/en/buy/carbon-steel/0-375-x-3-carbon-steel-rectangle-bar-a36-hot-rolled/pid/10062) — web — Publisher's page; dimensions are facts
- Metals Depot: [C1018 cold finished hexagon (AISI 1018, ASTM A108): sizes, lb/ft, lengths](https://www.metalsdepot.com/cold-finish-steel-products/cold-finish-steel-hexagon) — web — Publisher's page; dimensions are facts
- Online Metals: [Carbon steel hex bar 1018 cold finish (ASTM A108): inch sizes and metric 5 to 18 mm, 60 in](https://www.onlinemetals.com/en/buy/carbon-steel-hex-bar-1018) — web — Publisher's page; dimensions are facts

## Questions

**What does 1 in hex bar weigh per foot?**

2.94 lb/ft (1018 cold finished hexagon, Metals Depot).

**How long is steel flat bar sold?**

Continental Steel lists A36 flat bar in 20 ft lengths; Online Metals cuts to length up to 240 in.

**What metric hex bar sizes are stocked?**

5, 6, 7, 8, 10, 12, 13, 15 and 18 mm across flats in 60 in lengths (Online Metals).

## Fits with

- [Bar stock sizes: 1018 steel round and square 1/8 to 6 in, 6061 aluminum square 1/4 to 8 in (distributor list, inches and mm)](https://xemstudio.com/objects/bar-stock-sizes-round-square-steel-aluminum/)
- [Aluminum flat bar and round bar sizes (6061-T6): 64 flat sizes 1/8 x 1/2 to 1-1/4 x 3, 37 round diameters 1/4 to 10 in, with weight per foot](https://xemstudio.com/objects/aluminum-flat-bar-and-round-bar-sizes/)
- [Stainless steel round bar sizes (304): 1/8 to 12 in diameter with weight per foot; flat bar thickness and width ranges](https://xemstudio.com/objects/stainless-steel-round-and-flat-bar-sizes/)
- [Sheet metal gauge chart: steel, galvanized, stainless and aluminum (10, 12, 14, 16, 18, 20 gauge in inches and mm)](https://xemstudio.com/objects/sheet-metal-gauge-chart-steel-galvanized-stainless-aluminum/)