{
 "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": "strut-channel-1-5-8",
 "name": "Strut channel, 1-5/8 in (Unistrut / B-Line): profile, lips, slots and hole patterns",
 "kind": "standard",
 "category": "Hardware",
 "group": "Framing",
 "year": null,
 "question": "What are the exact dimensions of 1-5/8 in strut channel (Unistrut P1000, B-Line B22): lips, slot, hole pattern?",
 "tags": [
  "strut",
  "strut channel",
  "unistrut",
  "framing",
  "metal framing",
  "channel",
  "hole pattern",
  "mount"
 ],
 "aliases": [
  "unistrut dimensions",
  "unistrut p1000 dimensions",
  "strut channel dimensions",
  "unistrut lip dimensions",
  "unistrut slot width",
  "b-line b22",
  "superstrut",
  "unistrut stl",
  "unistrut step",
  "1-5/8 strut",
  "deep strut",
  "shallow strut",
  "p1001 back to back",
  "unistrut hole spacing",
  "unistrut slotted channel"
 ],
 "overall_mm": {
  "length": null,
  "width": 41.27,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 10,
 "url": "https://xemstudio.com/objects/strut-channel-1-5-8/",
 "sheet_txt": "https://xemstudio.com/objects/strut-channel-1-5-8/sheet.txt",
 "sheet": {
  "basis": "Unistrut 1-5/8 Framing System catalog (channel pages); Eaton B-Line channel and fittings catalog sections",
  "overall_mm": {
   "length": null,
   "width": 41.27,
   "height": null
  },
  "notes": [
   "Strut channel (Unistrut, B-Line and the many compatibles) is a 1-5/8 in wide cold-formed C section with the top edges turned in and down to form lips. A channel nut drops through the 7/8 in slot, turns 90° and its grooves bite the lips, so fittings, clamps and brackets bolt on anywhere along the length.",
   "The profile numbers are the same on every height in both makers' drawings: 3/8 in flanges each side, a 7/8 in slot and 9/32 in lips. Heights and gauges are from the Unistrut selection table; B-Line prints the same flanges and lip on B11, B12, B22, B24, B32, B42 and B52.",
   "Neither maker publishes the bend radii, so the files are drawn with sharp bends: the section is a little fuller than the real channel (P1000: 0.584 in² drawn vs .555 in² published). The lip depth is drawn from the top face down.",
   "Files are 6 in pieces. The hole and slot spacing is published; the distance from the cut end to the first hole is not (it depends where the channel was cut), so each pattern is centred on the piece.",
   "Knockouts are partly sheared discs, not holes, so no knockout file is drawn; their size and spacing are in the table. The 16 ga 13/16 in profile (P4000 / B26 family) prints different flange numbers and is left out of the files.",
   "Fittings (flat plates, angles, brackets) share one hole pattern: 9/16 in holes, 1-7/8 in apart, 13/16 in from the end, on a 1-5/8 in wide plate. That matches the 1-7/8 in hole spacing in the channel back."
  ],
  "table": {
   "columns": [
    "parameter",
    "value"
   ],
   "rows": [
    [
     "width (all)",
     "1-5/8 in (41.3 mm)"
    ],
    [
     "slot opening between the lips",
     "7/8 in (22.2 mm)"
    ],
    [
     "top flange, outer face to slot edge (each side)",
     "3/8 in (9.5 mm)"
    ],
    [
     "inturned lip depth (from the top face)",
     "9/32 in (7.1 mm)"
    ],
    [
     "12 ga thickness",
     ".105 in (2.7 mm)"
    ],
    [
     "14 ga thickness",
     ".075 in (1.9 mm)"
    ],
    [
     "16 ga thickness",
     ".060 in (1.5 mm)"
    ],
    [
     "height 1-5/8 in (41.3 mm)",
     "Unistrut P1000 (12 ga), P1100 (14 ga), P2000 (16 ga); B-Line B22 (12 ga), B24 (14 ga)"
    ],
    [
     "height 1-3/8 in (34.9 mm)",
     "Unistrut P3000 (12 ga); B-Line B32"
    ],
    [
     "height 1 in (25.4 mm)",
     "Unistrut P4400 (12 ga); B-Line B42"
    ],
    [
     "height 7/8 in (22.2 mm)",
     "Unistrut P3300 (12 ga)"
    ],
    [
     "height 13/16 in (20.6 mm)",
     "Unistrut P4000 (16 ga), P4100 (14 ga), P4520 (12 ga); B-Line B52 (12 ga), B54 (14 ga)"
    ],
    [
     "height 2-7/16 in (61.9 mm)",
     "Unistrut P5500 (12 ga); B-Line B12"
    ],
    [
     "height 3-1/4 in (82.6 mm)",
     "Unistrut P5000 (12 ga); B-Line B11; or two 1-5/8 channels back to back (P1001)"
    ],
    [
     "slotted back",
     "9/16 × 1-1/8 in (14.3 × 28.6 mm) slots on 2 in (50.8 mm) centres"
    ],
    [
     "holes in the back",
     "9/16 in (14.3 mm) holes on 1-7/8 in (47.6 mm) centres"
    ],
    [
     "knockouts",
     "7/8 in (22.2 mm) on 6 in (152.4 mm) centres"
    ],
    [
     "long slots (other patterns)",
     "13/32 × 3 in (10.3 × 76.2 mm) on 4 in centres; 7/8 × 2-3/4 in on 3-1/2 in centres; 11/16 × 2 in on 3 in centres"
    ],
    [
     "fitting bolt holes",
     "9/16 in (14.3 mm), 1-7/8 in (47.6 mm) on centre, 13/16 in (20.6 mm) from the end"
    ],
    [
     "fitting width / thickness",
     "1-5/8 in (41.3 mm) / 7/32 in (5.5 mm) (B-Line)"
    ],
    [
     "P1000 section area (published)",
     ".555 in² (3.58 cm²); this file's sharp-bend section: 0.584 in²"
    ]
   ]
  }
 },
 "sheet_text": "Strut channel, 1-5/8 in (Unistrut / B-Line): profile, lips, slots and hole patterns — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/strut-channel-1-5-8/  (sheet CC BY 4.0)\nBasis: Unistrut 1-5/8 Framing System catalog (channel pages); Eaton B-Line channel and fittings catalog sections\nCatalog version: 2026-10-20\n\nOverall (mm): width 41.27\n- Strut channel (Unistrut, B-Line and the many compatibles) is a 1-5/8 in wide cold-formed C section with the top edges turned in and down to form lips. A channel nut drops through the 7/8 in slot, turns 90° and its grooves bite the lips, so fittings, clamps and brackets bolt on anywhere along the length.\n- The profile numbers are the same on every height in both makers' drawings: 3/8 in flanges each side, a 7/8 in slot and 9/32 in lips. Heights and gauges are from the Unistrut selection table; B-Line prints the same flanges and lip on B11, B12, B22, B24, B32, B42 and B52.\n- Neither maker publishes the bend radii, so the files are drawn with sharp bends: the section is a little fuller than the real channel (P1000: 0.584 in² drawn vs .555 in² published). The lip depth is drawn from the top face down.\n- Files are 6 in pieces. The hole and slot spacing is published; the distance from the cut end to the first hole is not (it depends where the channel was cut), so each pattern is centred on the piece.\n- Knockouts are partly sheared discs, not holes, so no knockout file is drawn; their size and spacing are in the table. The 16 ga 13/16 in profile (P4000 / B26 family) prints different flange numbers and is left out of the files.\n- Fittings (flat plates, angles, brackets) share one hole pattern: 9/16 in holes, 1-7/8 in apart, 13/16 in from the end, on a 1-5/8 in wide plate. That matches the 1-7/8 in hole spacing in the channel back.\n\nparameter  value\nwidth (all)  1-5/8 in (41.3 mm)\nslot opening between the lips  7/8 in (22.2 mm)\ntop flange, outer face to slot edge (each side)  3/8 in (9.5 mm)\ninturned lip depth (from the top face)  9/32 in (7.1 mm)\n12 ga thickness  .105 in (2.7 mm)\n14 ga thickness  .075 in (1.9 mm)\n16 ga thickness  .060 in (1.5 mm)\nheight 1-5/8 in (41.3 mm)  Unistrut P1000 (12 ga), P1100 (14 ga), P2000 (16 ga); B-Line B22 (12 ga), B24 (14 ga)\nheight 1-3/8 in (34.9 mm)  Unistrut P3000 (12 ga); B-Line B32\nheight 1 in (25.4 mm)  Unistrut P4400 (12 ga); B-Line B42\nheight 7/8 in (22.2 mm)  Unistrut P3300 (12 ga)\nheight 13/16 in (20.6 mm)  Unistrut P4000 (16 ga), P4100 (14 ga), P4520 (12 ga); B-Line B52 (12 ga), B54 (14 ga)\nheight 2-7/16 in (61.9 mm)  Unistrut P5500 (12 ga); B-Line B12\nheight 3-1/4 in (82.6 mm)  Unistrut P5000 (12 ga); B-Line B11; or two 1-5/8 channels back to back (P1001)\nslotted back  9/16 × 1-1/8 in (14.3 × 28.6 mm) slots on 2 in (50.8 mm) centres\nholes in the back  9/16 in (14.3 mm) holes on 1-7/8 in (47.6 mm) centres\nknockouts  7/8 in (22.2 mm) on 6 in (152.4 mm) centres\nlong slots (other patterns)  13/32 × 3 in (10.3 × 76.2 mm) on 4 in centres; 7/8 × 2-3/4 in on 3-1/2 in centres; 11/16 × 2 in on 3 in centres\nfitting bolt holes  9/16 in (14.3 mm), 1-7/8 in (47.6 mm) on centre, 13/16 in (20.6 mm) from the end\nfitting width / thickness  1-5/8 in (41.3 mm) / 7/32 in (5.5 mm) (B-Line)\nP1000 section area (published)  .555 in² (3.58 cm²); this file's sharp-bend section: 0.584 in²\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Unistrut (Atkore): 1-5/8\" Framing System catalog: Channels (P1000 to P5500 drawings, selection table, hole patterns) — web — Publisher's page; dimensions are facts — https://unistrut.biz/content/CatalogPDFs/1-5-8-Channel.pdf\n- Eaton B-Line: B-Line series strut systems: Channel and combinations catalog section (B11 to B56 profiles, hole patterns) — web — Publisher's page; dimensions are facts — https://www.eaton.com/content/dam/eaton/products/support-systems/strut-systems-&-accessories/b-line-series-strut-channel/channel-and-combinations-catalog-section.pdf\n- Eaton B-Line: B-Line series strut systems: Strut fittings catalog section (general fitting hole size, spacing, width, thickness) — web — Publisher's page; dimensions are facts — https://www.eaton.com/content/dam/eaton/products/support-systems/strut-systems-&-accessories/strut-fittings-and-accessories/strut-fittings-catalog-section.pdf\n- Unistrut Ohio (Unistrut service centre): P5000HS channel: 9/16\" holes 1-7/8\" on center, back side — web — Publisher's page; dimensions are facts — https://unistrutohio.com/products/p5000hs\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 10 parts): https://xemstudio.com/files/hardware/strut-channel-1-5-8/index.json\nAPI: https://xemstudio.com/api/geometry?object=strut-channel-1-5-8\n",
 "sources": [
  {
   "publisher": "Unistrut (Atkore)",
   "title": "1-5/8\" Framing System catalog: Channels (P1000 to P5500 drawings, selection table, hole patterns)",
   "url": "https://unistrut.biz/content/CatalogPDFs/1-5-8-Channel.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Eaton B-Line",
   "title": "B-Line series strut systems: Channel and combinations catalog section (B11 to B56 profiles, hole patterns)",
   "url": "https://www.eaton.com/content/dam/eaton/products/support-systems/strut-systems-&-accessories/b-line-series-strut-channel/channel-and-combinations-catalog-section.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Eaton B-Line",
   "title": "B-Line series strut systems: Strut fittings catalog section (general fitting hole size, spacing, width, thickness)",
   "url": "https://www.eaton.com/content/dam/eaton/products/support-systems/strut-systems-&-accessories/strut-fittings-and-accessories/strut-fittings-catalog-section.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Unistrut Ohio (Unistrut service centre)",
   "title": "P5000HS channel: 9/16\" holes 1-7/8\" on center, back side",
   "url": "https://unistrutohio.com/products/p5000hs",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
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  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
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  "tolerance_mm": null
 },
 "related": [
  "strut-channel-spring-nuts",
  "1515-t-slot-extrusion-inch",
  "din-rail-35mm",
  "emt-conduit"
 ],
 "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": "How wide is the opening in Unistrut channel?",
   "a": "7/8 in (22.2 mm) between the lips; each top flange is 3/8 in and the lips turn down 9/32 in."
  },
  {
   "q": "What is the hole spacing in slotted strut?",
   "a": "9/16 × 1-1/8 in slots on 2 in centres; round-hole channel has 9/16 in holes on 1-7/8 in centres, matching the fittings."
  }
 ],
 "files_license": null,
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   "note": "1-5/8 × 1.625 in (41.3 mm), 12 ga (2.67 mm), P1000/B22-size profile, 6 in long, plain back; pattern centred on the piece, sharp bends"
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   "note": "1-5/8 × 0.8125 in (20.6 mm), 12 ga (2.67 mm), P4520/B52-size profile, 6 in long, 9/16 × 1-1/8 in slots on 2 in centres in the back; pattern centred on the piece, sharp bends"
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   "note": "1-5/8 × 2.4375 in (61.9 mm), 12 ga (2.67 mm), P5500/B12-size profile, 6 in long, 9/16 × 1-1/8 in slots on 2 in centres in the back; pattern centred on the piece, sharp bends"
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   "note": "1-5/8 × 3.25 in (82.5 mm), 12 ga (2.67 mm), P5000/B11-size profile, 6 in long, 9/16 × 1-1/8 in slots on 2 in centres in the back; pattern centred on the piece, sharp bends"
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  }
 ],
 "markdown": "https://xemstudio.com/objects/strut-channel-1-5-8/index.md"
}