Xem Studiomeasured geometry

Library › Hardware › Materials & stock ·

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)

What diameters does round steel bar come in, and what sizes of square bar are stocked? · Standard part · basis: Metals Depot's cold finish steel round, cold finish steel square and aluminium square listings; numbers only (one distributor, not a standard)

Also called: round bar stock sizes, steel round bar diameters, square bar stock sizes, 1018 cold rolled round sizes, aluminum square bar sizes, 6061 square bar sizes, standard steel bar sizes, cold finished steel bar sizes, round steel stock sizes inches, 1/2 round bar in mm, steel bar stock lengths, metal bar stock sizes chart

Exact dimensions. True size, with no tolerance added.

sizes
57 in table

Notes

  • The sizes ONE distributor lists, not a standard: Metals Depot's cold finish 1018 (AISI 1018 / ASTM A108 / UNS G10180) round (53 diameters, 1/8 to 6 in) and square (30 sizes, 1/8 to 6 in) steel bar, and its 6061 aluminium square bar (30 sizes, 1/4 to 8 in; 6061-T6511 per ASTM B221 for most, the 1/4 in and 8 in listings say 6061-T6). 'yes' means it is listed; '-' means not listed by that distributor in that product, not that nobody makes it. Round diameter and square side are the nominal size; cold-finished bar is held to ASTM A108 tolerances that are not on the page.
  • Stock lengths on the same pages: 2, 4, 6 ft and 10 to 12 ft random lengths (steel), 2, 4, 6, 12 ft (aluminium), standard length tolerance ±1/4 in; some sizes also list 1, 8, 10, 12 and 20 ft. The page also lists 7, 8, 10 and 12 in rounds, but as hot rolled, not cold finish, so they are not in the table.
  • Left out: flat bar (the Metals Depot page gives no thickness × width list; Continental Steel's hot rolled A36 flat bar page lists 20 ft bars from 1/8 × 1/2 in but shows 25 of 280 items and has two typos in them, a wrong weight and a mislabelled width, so it is not tabulated), hex bar, metric round and square bar, hot rolled round, aluminium round and flat bar. Weights per foot are not on the Metals Depot pages used and are not computed here.
  • Bar stock is a plain round or square prism, so no file is drawn. For sections with real profiles see aluminum-angles, aisc-l-angles, the square and rectangular tube pages and the carbon rod sizes.

Bar stock sizes: 1018 steel round and square 1/8 to 6 in, 6061… size chart

size (in)decimal (in)mm (computed)steel round 1018steel square 1018aluminum square 6061
1/80.12503.17yesyes-
3/160.18754.76yesyes-
1/40.25006.35yesyesyes
5/160.31257.94yesyesyes
3/80.37509.52yesyesyes
7/160.437511.11yesyes-
1/20.500012.70yesyesyes
9/160.562514.29yesyes-
5/80.625015.88yesyesyes
11/160.687517.46yesyes-
3/40.750019.05yesyesyes
13/160.812520.64yesyes-
7/80.875022.22yesyesyes
15/160.937523.81yesyes-
11.000025.40yesyesyes
1-1/161.062526.99yes--
1-1/81.125028.57yesyesyes
1-3/161.187530.16yesyes-
1-1/41.250031.75yesyesyes
1-5/161.312533.34yes--
1-3/81.375034.92yesyesyes
1-7/161.437536.51yes--
1-1/21.500038.10yesyesyes
1-9/161.562539.69yes--
1-5/81.625041.27yesyesyes
1-11/161.687542.86yes--
1-3/41.750044.45yesyesyes
1-13/161.812546.04yes--
1-7/81.875047.62yes-yes
1-15/161.937549.21yes--
22.000050.80yesyesyes
2-1/162.062552.39yes--
2-1/82.125053.97yes--
2-3/162.187555.56yes--
2-1/42.250057.15yesyesyes
2-5/162.312558.74yes--
2-3/82.375060.32yes--
2-7/162.437561.91yes--
2-1/22.500063.50yesyesyes
2-9/162.562565.09yes--
2-5/82.625066.67yes--
2-11/162.687568.26yes--
2-3/42.750069.85yes-yes
2-7/82.875073.02yes--
2-15/162.937574.61yes--
33.000076.20yesyesyes
3-1/43.250082.55yes-yes
3-1/23.500088.90yesyesyes
3-3/43.750095.25yes--
44.0000101.60yesyesyes
4-1/24.5000114.30yes-yes
55.0000127.00yesyesyes
5-1/25.5000139.70--yes
66.0000152.40yesyesyes
6-1/26.5000165.10--yes
77.0000177.80--yes
88.0000203.20--yes

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Metals DepotCold finish steel round: 1018 (ASTM A108), 1/8 to 6 in diameters and stock lengthswebDistributor page; sizes are facts
Metals DepotCold finish steel square: 1018 (ASTM A108), 1/8 to 6 in and stock lengthswebDistributor page; sizes are facts
Metals DepotAluminum square bar: 6061-T6511 (ASTM B221), 1/4 to 8 in and stock lengthswebDistributor page; sizes are facts
Continental SteelHot rolled flat bar A36: first 25 of 280 listings, 20 ft lengths (not used for a size table: its page has typos)webPublisher's page; dimensions are facts

Xem scan

File coming

No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.

Let your AI pull this. Add https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.
Set it up →

Plain text: sheet.txt · JSON: /api/geometry?object=bar-stock-sizes-round-square-steel-aluminum

length
Schematic, not to scale.

Fits with

Aluminum angles (equal and unequal leg): 1 x 1 x 1/8, 2 x 2 x 1/4, 3 x 3 x 1/4, 4 x 3 x 3/8 sizes and weights59 sizes★ sheet
Steel angles L (AISC): L4x4x1/4, L3x3x1/4, L2x2x1/4, L5x3x1/4 dimensions + STEP/STL, isometric render of a generated part
Steel angles L (AISC): L4x4x1/4, L3x3x1/4, L2x2x1/4, L5x3x1/4 dimensions + STEP/STL101.6 mm★ 31 files
length
Square and rectangular steel tube sizes by gauge (1x1, 1-1/2, 2x1 in; 16, 14, 11 ga) + ASTM A500 corner radius limit, weight per foot38 sizes★ sheet
Aluminum square tube 6063-T52: 1x1x1/16, 1x1x1/8, 1-1/2 sq, 2 sq sizes, wall and weight + STEP/STL, isometric render of a generated part
Aluminum square tube 6063-T52: 1x1x1/16, 1x1x1/8, 1-1/2 sq, 2 sq sizes, wall and weight + STEP/STL101.6 mm★ 17 files
Aluminum rectangular tube 6063-T52: 1x2x1/8, 2x3, 2x4, 1x1-1/2 sizes, wall and weight + STEP/STL, isometric render of a generated part
Aluminum rectangular tube 6063-T52: 1x2x1/8, 2x3, 2x4, 1x1-1/2 sizes, wall and weight + STEP/STL101.6 mm★ 20 files
Carbon fibre rod sizes: round 0.28 to 12 mm, square 4 to 10 mm21 sizes★ sheet
length
Sheet metal gauge chart: steel, galvanized, stainless and aluminum (10, 12, 14, 16, 18, 20 gauge in inches and mm)36 sizes★ sheet
Threaded rod, inch: #4 to 4 in, UNC and UNF threads per inch, major diameter in inches and mm, standard lengths30 sizes★ sheet

Questions

What diameters does 1018 cold finished round bar come in?

At Metals Depot: 1/8 in to 3 in in steps of 1/16 or 1/8 in (some sizes skipped), then 3-1/4, 3-1/2, 3-3/4, 4, 4-1/2, 5 and 6 in (the table lists all 53).

What lengths is bar stock sold in?

2, 4, 6 ft and 10 to 12 ft random lengths for the steel, 2, 4, 6 and 12 ft for the aluminium square; tolerance ±1/4 in.

What aluminum alloy is square bar?

6061, usually T6511 (ASTM B221), per the distributor's page.