{
 "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": "aluminum-i-beams",
 "name": "Aluminum I-beams (Aluminum Association standard): 3 x 1.64 to 12 x 14.29 dimensions + STEP/STL",
 "kind": "standard",
 "category": "Hardware",
 "group": "Framing",
 "year": null,
 "question": "What are the dimensions of an aluminum 6 x 4.03 I-beam?",
 "tags": [
  "aluminum",
  "i-beam",
  "aluminum association",
  "extrusion",
  "structural"
 ],
 "aliases": [
  "aluminum i beam dimensions",
  "aluminum i-beam sizes",
  "aluminum i beam 6 x 4.03",
  "aluminum i beam 4 x 2.31",
  "aluminum i beam 3 x 1.64",
  "aluminum i beam 8 x 6.18",
  "aluminum i beam step file",
  "6061 i beam dimensions"
 ],
 "overall_mm": {
  "length": 101.6,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 15,
 "url": "https://xemstudio.com/objects/aluminum-i-beams/",
 "sheet_txt": "https://xemstudio.com/objects/aluminum-i-beams/sheet.txt",
 "sheet": {
  "basis": "Aluminum Association standard I-beams: depth, width, flange, web, fillet radius, area",
  "overall_mm": {
   "length": 101.6,
   "width": null,
   "height": null
  },
  "notes": [
   "Aluminum Association standard I-beams are named depth x weight: 6 x 4.03 is a 6 in deep beam weighing 4.03 lb per foot. Flanges are parallel and constant thickness.",
   "Dimensions and the printed fillet radius R at the four web-flange corners are from the Engineers Edge table of standard aluminum I-beams (the page names no author; the sizes and areas agree with the Aluminum Association series). Flange tips are drawn square. Drawn area is within 5 % of the printed area on every size.",
   "Files are 4 in (101.6 mm) long along X, centred on y = 0, z = 0 on the bottom face. Designations round the printed weight to two decimals."
  ],
  "table": {
   "columns": [
    "designation",
    "lb/ft",
    "depth (in)",
    "width (in)",
    "flange (in)",
    "web (in)",
    "fillet R (in)",
    "area (in2)",
    "depth (mm)",
    "width (mm)"
   ],
   "rows": [
    [
     "3 x 1.64",
     1.637,
     3,
     2.5,
     0.2,
     0.13,
     0.25,
     1.392,
     76.2,
     63.5
    ],
    [
     "3 x 2.03",
     2.03,
     3,
     2.5,
     0.26,
     0.15,
     0.25,
     1.726,
     76.2,
     63.5
    ],
    [
     "4 x 2.31",
     2.311,
     4,
     3,
     0.23,
     0.15,
     0.25,
     1.965,
     101.6,
     76.2
    ],
    [
     "4 x 2.79",
     2.793,
     4,
     3,
     0.29,
     0.17,
     0.25,
     2.375,
     101.6,
     76.2
    ],
    [
     "5 x 3.70",
     3.7,
     5,
     3.5,
     0.32,
     0.19,
     0.3,
     3.146,
     127,
     88.9
    ],
    [
     "6 x 4.03",
     4.03,
     6,
     4,
     0.29,
     0.19,
     0.3,
     3.427,
     152.4,
     101.6
    ],
    [
     "6 x 4.69",
     4.692,
     6,
     4,
     0.35,
     0.21,
     0.3,
     3.99,
     152.4,
     101.6
    ],
    [
     "7 x 5.80",
     5.8,
     7,
     4.5,
     0.38,
     0.23,
     0.3,
     4.932,
     177.8,
     114.3
    ],
    [
     "8 x 6.18",
     6.181,
     8,
     5,
     0.35,
     0.23,
     0.3,
     5.256,
     203.2,
     127
    ],
    [
     "8 x 7.02",
     7.023,
     8,
     5,
     0.41,
     0.25,
     0.3,
     5.972,
     203.2,
     127
    ],
    [
     "9 x 8.36",
     8.361,
     9,
     5.5,
     0.44,
     0.27,
     0.3,
     7.11,
     228.6,
     139.7
    ],
    [
     "10 x 8.65",
     8.646,
     10,
     6,
     0.41,
     0.25,
     0.4,
     7.352,
     254,
     152.4
    ],
    [
     "10 x 10.29",
     10.286,
     10,
     6,
     0.5,
     0.29,
     0.4,
     8.747,
     254,
     152.4
    ],
    [
     "12 x 11.67",
     11.672,
     12,
     7,
     0.47,
     0.29,
     0.4,
     9.925,
     304.8,
     177.8
    ],
    [
     "12 x 14.29",
     14.292,
     12,
     7,
     0.62,
     0.31,
     0.4,
     12.153,
     304.8,
     177.8
    ]
   ]
  }
 },
 "sheet_text": "Aluminum I-beams (Aluminum Association standard): 3 x 1.64 to 12 x 14.29 dimensions + STEP/STL — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/aluminum-i-beams/  (sheet CC BY 4.0)\nBasis: Aluminum Association standard I-beams: depth, width, flange, web, fillet radius, area\nCatalog version: 2026-10-20\n\nOverall (mm): length 101.6\n- Aluminum Association standard I-beams are named depth x weight: 6 x 4.03 is a 6 in deep beam weighing 4.03 lb per foot. Flanges are parallel and constant thickness.\n- Dimensions and the printed fillet radius R at the four web-flange corners are from the Engineers Edge table of standard aluminum I-beams (the page names no author; the sizes and areas agree with the Aluminum Association series). Flange tips are drawn square. Drawn area is within 5 % of the printed area on every size.\n- Files are 4 in (101.6 mm) long along X, centred on y = 0, z = 0 on the bottom face. Designations round the printed weight to two decimals.\n\ndesignation  lb/ft  depth (in)  width (in)  flange (in)  web (in)  fillet R (in)  area (in2)  depth (mm)  width (mm)\n3 x 1.64  1.637  3.0  2.5  0.2  0.13  0.25  1.392  76.2  63.5\n3 x 2.03  2.03  3.0  2.5  0.26  0.15  0.25  1.726  76.2  63.5\n4 x 2.31  2.311  4.0  3.0  0.23  0.15  0.25  1.965  101.6  76.2\n4 x 2.79  2.793  4.0  3.0  0.29  0.17  0.25  2.375  101.6  76.2\n5 x 3.70  3.7  5.0  3.5  0.32  0.19  0.3  3.146  127.0  88.9\n6 x 4.03  4.03  6.0  4.0  0.29  0.19  0.3  3.427  152.4  101.6\n6 x 4.69  4.692  6.0  4.0  0.35  0.21  0.3  3.99  152.4  101.6\n7 x 5.80  5.8  7.0  4.5  0.38  0.23  0.3  4.932  177.8  114.3\n8 x 6.18  6.181  8.0  5.0  0.35  0.23  0.3  5.256  203.2  127.0\n8 x 7.02  7.023  8.0  5.0  0.41  0.25  0.3  5.972  203.2  127.0\n9 x 8.36  8.361  9.0  5.5  0.44  0.27  0.3  7.11  228.6  139.7\n10 x 8.65  8.646  10.0  6.0  0.41  0.25  0.4  7.352  254.0  152.4\n10 x 10.29  10.286  10.0  6.0  0.5  0.29  0.4  8.747  254.0  152.4\n12 x 11.67  11.672  12.0  7.0  0.47  0.29  0.4  9.925  304.8  177.8\n12 x 14.29  14.292  12.0  7.0  0.62  0.31  0.4  12.153  304.8  177.8\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Engineers Edge: Standard Aluminum I-Beam size table: depth, width, weight, area, flange, web, fillet radius — web — The page names no author; the sizes match the Aluminum Association standard I-beams and the area check below agrees — https://engineersedge.com/I_beams_aluminum.htm\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 15 parts): https://xemstudio.com/files/hardware/aluminum-i-beams/index.json\nAPI: https://xemstudio.com/api/geometry?object=aluminum-i-beams\n",
 "sources": [
  {
   "publisher": "Engineers Edge",
   "title": "Standard Aluminum I-Beam size table: depth, width, weight, area, flange, web, fillet radius",
   "url": "https://engineersedge.com/I_beams_aluminum.htm",
   "formats": [
    "web"
   ],
   "license": "The page names no author; the sizes match the Aluminum Association standard I-beams and the area check below agrees",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "aluminum-channels",
  "aluminum-angles",
  "aisc-w-shapes",
  "2020-aluminum-extrusion"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. 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.",
 "mating": [],
 "faq": [
  {
   "q": "What does 6 x 4.03 mean for an aluminum I-beam?",
   "a": "A 6 in deep Aluminum Association I-beam weighing 4.03 lb per foot."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "i-3x1-64-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-3x1-64-4in.step",
   "stl": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-3x1-64-4in.stl",
   "note": "Aluminum I-beam 3 x 1.64: depth 3 in, flange width 2.5 in, flange 0.2 in, web 0.13 in, fillet R 0.25 in, 4 in long"
  },
  {
   "file": "i-3x2-03-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-3x2-03-4in.step",
   "stl": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-3x2-03-4in.stl",
   "note": "Aluminum I-beam 3 x 2.03: depth 3 in, flange width 2.5 in, flange 0.26 in, web 0.15 in, fillet R 0.25 in, 4 in long"
  },
  {
   "file": "i-4x2-31-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-4x2-31-4in.step",
   "stl": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-4x2-31-4in.stl",
   "note": "Aluminum I-beam 4 x 2.31: depth 4 in, flange width 3 in, flange 0.23 in, web 0.15 in, fillet R 0.25 in, 4 in long"
  },
  {
   "file": "i-4x2-79-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-4x2-79-4in.step",
   "stl": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-4x2-79-4in.stl",
   "note": "Aluminum I-beam 4 x 2.79: depth 4 in, flange width 3 in, flange 0.29 in, web 0.17 in, fillet R 0.25 in, 4 in long"
  },
  {
   "file": "i-5x3-70-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-5x3-70-4in.step",
   "stl": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-5x3-70-4in.stl",
   "note": "Aluminum I-beam 5 x 3.70: depth 5 in, flange width 3.5 in, flange 0.32 in, web 0.19 in, fillet R 0.3 in, 4 in long"
  },
  {
   "file": "i-6x4-03-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-6x4-03-4in.step",
   "stl": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-6x4-03-4in.stl",
   "note": "Aluminum I-beam 6 x 4.03: depth 6 in, flange width 4 in, flange 0.29 in, web 0.19 in, fillet R 0.3 in, 4 in long"
  },
  {
   "file": "i-6x4-69-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-6x4-69-4in.step",
   "stl": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-6x4-69-4in.stl",
   "note": "Aluminum I-beam 6 x 4.69: depth 6 in, flange width 4 in, flange 0.35 in, web 0.21 in, fillet R 0.3 in, 4 in long"
  },
  {
   "file": "i-7x5-80-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-7x5-80-4in.step",
   "stl": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-7x5-80-4in.stl",
   "note": "Aluminum I-beam 7 x 5.80: depth 7 in, flange width 4.5 in, flange 0.38 in, web 0.23 in, fillet R 0.3 in, 4 in long"
  },
  {
   "file": "i-8x6-18-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-8x6-18-4in.step",
   "stl": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-8x6-18-4in.stl",
   "note": "Aluminum I-beam 8 x 6.18: depth 8 in, flange width 5 in, flange 0.35 in, web 0.23 in, fillet R 0.3 in, 4 in long"
  },
  {
   "file": "i-8x7-02-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-8x7-02-4in.step",
   "stl": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-8x7-02-4in.stl",
   "note": "Aluminum I-beam 8 x 7.02: depth 8 in, flange width 5 in, flange 0.41 in, web 0.25 in, fillet R 0.3 in, 4 in long"
  },
  {
   "file": "i-9x8-36-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-9x8-36-4in.step",
   "stl": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-9x8-36-4in.stl",
   "note": "Aluminum I-beam 9 x 8.36: depth 9 in, flange width 5.5 in, flange 0.44 in, web 0.27 in, fillet R 0.3 in, 4 in long"
  },
  {
   "file": "i-10x8-65-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-10x8-65-4in.step",
   "stl": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-10x8-65-4in.stl",
   "note": "Aluminum I-beam 10 x 8.65: depth 10 in, flange width 6 in, flange 0.41 in, web 0.25 in, fillet R 0.4 in, 4 in long"
  },
  {
   "file": "i-10x10-29-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-10x10-29-4in.step",
   "stl": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-10x10-29-4in.stl",
   "note": "Aluminum I-beam 10 x 10.29: depth 10 in, flange width 6 in, flange 0.5 in, web 0.29 in, fillet R 0.4 in, 4 in long"
  },
  {
   "file": "i-12x11-67-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-12x11-67-4in.step",
   "stl": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-12x11-67-4in.stl",
   "note": "Aluminum I-beam 12 x 11.67: depth 12 in, flange width 7 in, flange 0.47 in, web 0.29 in, fillet R 0.4 in, 4 in long"
  },
  {
   "file": "i-12x14-29-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-12x14-29-4in.step",
   "stl": "https://xemstudio.com/files/hardware/aluminum-i-beams/i-12x14-29-4in.stl",
   "note": "Aluminum I-beam 12 x 14.29: depth 12 in, flange width 7 in, flange 0.62 in, web 0.31 in, fillet R 0.4 in, 4 in long"
  }
 ],
 "markdown": "https://xemstudio.com/objects/aluminum-i-beams/index.md"
}