{
 "version": "2026-10-20",
 "license": "Dimension sheets: CC BY 4.0. Standard and published-size files: CC BY 4.0. Xem Studio's own designs (files_license = Xem Studio Design License): free to use and sell things from, not to redistribute as files — https://xemstudio.com/license/. Other publishers' files: their own license, linked beside them.",
 "slug": "bar-stock-sizes-round-square-steel-aluminum",
 "name": "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)",
 "kind": "standard",
 "category": "Hardware",
 "group": "Materials & stock",
 "year": null,
 "question": "What diameters does round steel bar come in, and what sizes of square bar are stocked?",
 "tags": [
  "bar stock",
  "round bar",
  "square bar",
  "steel",
  "aluminum",
  "1018",
  "6061",
  "cold finished",
  "metal stock"
 ],
 "aliases": [
  "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"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/bar-stock-sizes-round-square-steel-aluminum/",
 "sheet_txt": "https://xemstudio.com/objects/bar-stock-sizes-round-square-steel-aluminum/sheet.txt",
 "sheet": {
  "basis": "Metals Depot's cold finish steel round, cold finish steel square and aluminium square listings; numbers only (one distributor, not a standard)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "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."
  ],
  "table": {
   "columns": [
    "size (in)",
    "decimal (in)",
    "mm (computed)",
    "steel round 1018",
    "steel square 1018",
    "aluminum square 6061"
   ],
   "rows": [
    [
     "1/8",
     "0.1250",
     "3.17",
     "yes",
     "yes",
     "-"
    ],
    [
     "3/16",
     "0.1875",
     "4.76",
     "yes",
     "yes",
     "-"
    ],
    [
     "1/4",
     "0.2500",
     "6.35",
     "yes",
     "yes",
     "yes"
    ],
    [
     "5/16",
     "0.3125",
     "7.94",
     "yes",
     "yes",
     "yes"
    ],
    [
     "3/8",
     "0.3750",
     "9.52",
     "yes",
     "yes",
     "yes"
    ],
    [
     "7/16",
     "0.4375",
     "11.11",
     "yes",
     "yes",
     "-"
    ],
    [
     "1/2",
     "0.5000",
     "12.70",
     "yes",
     "yes",
     "yes"
    ],
    [
     "9/16",
     "0.5625",
     "14.29",
     "yes",
     "yes",
     "-"
    ],
    [
     "5/8",
     "0.6250",
     "15.88",
     "yes",
     "yes",
     "yes"
    ],
    [
     "11/16",
     "0.6875",
     "17.46",
     "yes",
     "yes",
     "-"
    ],
    [
     "3/4",
     "0.7500",
     "19.05",
     "yes",
     "yes",
     "yes"
    ],
    [
     "13/16",
     "0.8125",
     "20.64",
     "yes",
     "yes",
     "-"
    ],
    [
     "7/8",
     "0.8750",
     "22.22",
     "yes",
     "yes",
     "yes"
    ],
    [
     "15/16",
     "0.9375",
     "23.81",
     "yes",
     "yes",
     "-"
    ],
    [
     "1",
     "1.0000",
     "25.40",
     "yes",
     "yes",
     "yes"
    ],
    [
     "1-1/16",
     "1.0625",
     "26.99",
     "yes",
     "-",
     "-"
    ],
    [
     "1-1/8",
     "1.1250",
     "28.57",
     "yes",
     "yes",
     "yes"
    ],
    [
     "1-3/16",
     "1.1875",
     "30.16",
     "yes",
     "yes",
     "-"
    ],
    [
     "1-1/4",
     "1.2500",
     "31.75",
     "yes",
     "yes",
     "yes"
    ],
    [
     "1-5/16",
     "1.3125",
     "33.34",
     "yes",
     "-",
     "-"
    ],
    [
     "1-3/8",
     "1.3750",
     "34.92",
     "yes",
     "yes",
     "yes"
    ],
    [
     "1-7/16",
     "1.4375",
     "36.51",
     "yes",
     "-",
     "-"
    ],
    [
     "1-1/2",
     "1.5000",
     "38.10",
     "yes",
     "yes",
     "yes"
    ],
    [
     "1-9/16",
     "1.5625",
     "39.69",
     "yes",
     "-",
     "-"
    ],
    [
     "1-5/8",
     "1.6250",
     "41.27",
     "yes",
     "yes",
     "yes"
    ],
    [
     "1-11/16",
     "1.6875",
     "42.86",
     "yes",
     "-",
     "-"
    ],
    [
     "1-3/4",
     "1.7500",
     "44.45",
     "yes",
     "yes",
     "yes"
    ],
    [
     "1-13/16",
     "1.8125",
     "46.04",
     "yes",
     "-",
     "-"
    ],
    [
     "1-7/8",
     "1.8750",
     "47.62",
     "yes",
     "-",
     "yes"
    ],
    [
     "1-15/16",
     "1.9375",
     "49.21",
     "yes",
     "-",
     "-"
    ],
    [
     "2",
     "2.0000",
     "50.80",
     "yes",
     "yes",
     "yes"
    ],
    [
     "2-1/16",
     "2.0625",
     "52.39",
     "yes",
     "-",
     "-"
    ],
    [
     "2-1/8",
     "2.1250",
     "53.97",
     "yes",
     "-",
     "-"
    ],
    [
     "2-3/16",
     "2.1875",
     "55.56",
     "yes",
     "-",
     "-"
    ],
    [
     "2-1/4",
     "2.2500",
     "57.15",
     "yes",
     "yes",
     "yes"
    ],
    [
     "2-5/16",
     "2.3125",
     "58.74",
     "yes",
     "-",
     "-"
    ],
    [
     "2-3/8",
     "2.3750",
     "60.32",
     "yes",
     "-",
     "-"
    ],
    [
     "2-7/16",
     "2.4375",
     "61.91",
     "yes",
     "-",
     "-"
    ],
    [
     "2-1/2",
     "2.5000",
     "63.50",
     "yes",
     "yes",
     "yes"
    ],
    [
     "2-9/16",
     "2.5625",
     "65.09",
     "yes",
     "-",
     "-"
    ],
    [
     "2-5/8",
     "2.6250",
     "66.67",
     "yes",
     "-",
     "-"
    ],
    [
     "2-11/16",
     "2.6875",
     "68.26",
     "yes",
     "-",
     "-"
    ],
    [
     "2-3/4",
     "2.7500",
     "69.85",
     "yes",
     "-",
     "yes"
    ],
    [
     "2-7/8",
     "2.8750",
     "73.02",
     "yes",
     "-",
     "-"
    ],
    [
     "2-15/16",
     "2.9375",
     "74.61",
     "yes",
     "-",
     "-"
    ],
    [
     "3",
     "3.0000",
     "76.20",
     "yes",
     "yes",
     "yes"
    ],
    [
     "3-1/4",
     "3.2500",
     "82.55",
     "yes",
     "-",
     "yes"
    ],
    [
     "3-1/2",
     "3.5000",
     "88.90",
     "yes",
     "yes",
     "yes"
    ],
    [
     "3-3/4",
     "3.7500",
     "95.25",
     "yes",
     "-",
     "-"
    ],
    [
     "4",
     "4.0000",
     "101.60",
     "yes",
     "yes",
     "yes"
    ],
    [
     "4-1/2",
     "4.5000",
     "114.30",
     "yes",
     "-",
     "yes"
    ],
    [
     "5",
     "5.0000",
     "127.00",
     "yes",
     "yes",
     "yes"
    ],
    [
     "5-1/2",
     "5.5000",
     "139.70",
     "-",
     "-",
     "yes"
    ],
    [
     "6",
     "6.0000",
     "152.40",
     "yes",
     "yes",
     "yes"
    ],
    [
     "6-1/2",
     "6.5000",
     "165.10",
     "-",
     "-",
     "yes"
    ],
    [
     "7",
     "7.0000",
     "177.80",
     "-",
     "-",
     "yes"
    ],
    [
     "8",
     "8.0000",
     "203.20",
     "-",
     "-",
     "yes"
    ]
   ]
  }
 },
 "sheet_text": "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) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/bar-stock-sizes-round-square-steel-aluminum/  (sheet CC BY 4.0)\nBasis: Metals Depot's cold finish steel round, cold finish steel square and aluminium square listings; numbers only (one distributor, not a standard)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- 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.\n- 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.\n- 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.\n- 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.\n\nsize (in)  decimal (in)  mm (computed)  steel round 1018  steel square 1018  aluminum square 6061\n1/8  0.1250  3.17  yes  yes  -\n3/16  0.1875  4.76  yes  yes  -\n1/4  0.2500  6.35  yes  yes  yes\n5/16  0.3125  7.94  yes  yes  yes\n3/8  0.3750  9.52  yes  yes  yes\n7/16  0.4375  11.11  yes  yes  -\n1/2  0.5000  12.70  yes  yes  yes\n9/16  0.5625  14.29  yes  yes  -\n5/8  0.6250  15.88  yes  yes  yes\n11/16  0.6875  17.46  yes  yes  -\n3/4  0.7500  19.05  yes  yes  yes\n13/16  0.8125  20.64  yes  yes  -\n7/8  0.8750  22.22  yes  yes  yes\n15/16  0.9375  23.81  yes  yes  -\n1  1.0000  25.40  yes  yes  yes\n1-1/16  1.0625  26.99  yes  -  -\n1-1/8  1.1250  28.57  yes  yes  yes\n1-3/16  1.1875  30.16  yes  yes  -\n1-1/4  1.2500  31.75  yes  yes  yes\n1-5/16  1.3125  33.34  yes  -  -\n1-3/8  1.3750  34.92  yes  yes  yes\n1-7/16  1.4375  36.51  yes  -  -\n1-1/2  1.5000  38.10  yes  yes  yes\n1-9/16  1.5625  39.69  yes  -  -\n1-5/8  1.6250  41.27  yes  yes  yes\n1-11/16  1.6875  42.86  yes  -  -\n1-3/4  1.7500  44.45  yes  yes  yes\n1-13/16  1.8125  46.04  yes  -  -\n1-7/8  1.8750  47.62  yes  -  yes\n1-15/16  1.9375  49.21  yes  -  -\n2  2.0000  50.80  yes  yes  yes\n2-1/16  2.0625  52.39  yes  -  -\n2-1/8  2.1250  53.97  yes  -  -\n2-3/16  2.1875  55.56  yes  -  -\n2-1/4  2.2500  57.15  yes  yes  yes\n2-5/16  2.3125  58.74  yes  -  -\n2-3/8  2.3750  60.32  yes  -  -\n2-7/16  2.4375  61.91  yes  -  -\n2-1/2  2.5000  63.50  yes  yes  yes\n2-9/16  2.5625  65.09  yes  -  -\n2-5/8  2.6250  66.67  yes  -  -\n2-11/16  2.6875  68.26  yes  -  -\n2-3/4  2.7500  69.85  yes  -  yes\n2-7/8  2.8750  73.02  yes  -  -\n2-15/16  2.9375  74.61  yes  -  -\n3  3.0000  76.20  yes  yes  yes\n3-1/4  3.2500  82.55  yes  -  yes\n3-1/2  3.5000  88.90  yes  yes  yes\n3-3/4  3.7500  95.25  yes  -  -\n4  4.0000  101.60  yes  yes  yes\n4-1/2  4.5000  114.30  yes  -  yes\n5  5.0000  127.00  yes  yes  yes\n5-1/2  5.5000  139.70  -  -  yes\n6  6.0000  152.40  yes  yes  yes\n6-1/2  6.5000  165.10  -  -  yes\n7  7.0000  177.80  -  -  yes\n8  8.0000  203.20  -  -  yes\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Metals Depot: Cold finish steel round: 1018 (ASTM A108), 1/8 to 6 in diameters and stock lengths — web — Distributor page; sizes are facts — https://www.metalsdepot.com/cold-finish-steel-products/cold-finish-steel-round\n- Metals Depot: Cold finish steel square: 1018 (ASTM A108), 1/8 to 6 in and stock lengths — web — Distributor page; sizes are facts — https://www.metalsdepot.com/cold-finish-steel-products/cold-finish-steel-square\n- Metals Depot: Aluminum square bar: 6061-T6511 (ASTM B221), 1/4 to 8 in and stock lengths — web — Distributor page; sizes are facts — https://www.metalsdepot.com/aluminum-products/aluminum-square-bar\n- Continental Steel: Hot rolled flat bar A36: first 25 of 280 listings, 20 ft lengths (not used for a size table: its page has typos) — web — Publisher's page; dimensions are facts — https://titanium-stainless-steel.continentalsteel.com/printitems/steel-bars/hot-rolled-flat-bar?plpver=10\n\nNo true-size file yet: the published figures do not fix the whole shape; a measured scan is planned.\nAPI: https://xemstudio.com/api/geometry?object=bar-stock-sizes-round-square-steel-aluminum\n",
 "sources": [
  {
   "publisher": "Metals Depot",
   "title": "Cold finish steel round: 1018 (ASTM A108), 1/8 to 6 in diameters and stock lengths",
   "url": "https://www.metalsdepot.com/cold-finish-steel-products/cold-finish-steel-round",
   "formats": [
    "web"
   ],
   "license": "Distributor page; sizes are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Metals Depot",
   "title": "Cold finish steel square: 1018 (ASTM A108), 1/8 to 6 in and stock lengths",
   "url": "https://www.metalsdepot.com/cold-finish-steel-products/cold-finish-steel-square",
   "formats": [
    "web"
   ],
   "license": "Distributor page; sizes are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Metals Depot",
   "title": "Aluminum square bar: 6061-T6511 (ASTM B221), 1/4 to 8 in and stock lengths",
   "url": "https://www.metalsdepot.com/aluminum-products/aluminum-square-bar",
   "formats": [
    "web"
   ],
   "license": "Distributor page; sizes are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Continental Steel",
   "title": "Hot rolled flat bar A36: first 25 of 280 listings, 20 ft lengths (not used for a size table: its page has typos)",
   "url": "https://titanium-stainless-steel.continentalsteel.com/printitems/steel-bars/hot-rolled-flat-bar?plpver=10",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "aluminum-angles",
  "aisc-l-angles",
  "steel-square-rectangular-tube-gauge-sizes",
  "aluminum-square-tube-6063-t52",
  "aluminum-rectangular-tube-6063-t52",
  "carbon-fibre-rod-sizes",
  "sheet-metal-gauge-chart-steel-galvanized-stainless-aluminum",
  "threaded-rod-inch-unc-unf-sizes"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no tolerance added)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. Where a part meets another part, the object lists its mating features (feature, exact size, what it mates with, fit class: press, slide, run, socket, clamp or designed). Apply your process's allowance to those features only; 'designed' gaps are part of the design and stay as drawn. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/",
 "mating": [],
 "faq": [
  {
   "q": "What diameters does 1018 cold finished round bar come in?",
   "a": "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)."
  },
  {
   "q": "What lengths is bar stock sold in?",
   "a": "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."
  },
  {
   "q": "What aluminum alloy is square bar?",
   "a": "6061, usually T6511 (ASTM B221), per the distributor's page."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/bar-stock-sizes-round-square-steel-aluminum/index.md"
}