{
 "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-flat-plate-fittings",
 "name": "Strut flat plate fittings, 1-5/8 in: splice, tee and L corner plates (B-Line B129, B141, B341, B133, B143)",
 "kind": "standard",
 "category": "Hardware",
 "group": "Framing",
 "year": null,
 "question": "What are the dimensions of Unistrut / B-Line strut splice plates, tee plates and corner plates?",
 "tags": [
  "strut",
  "unistrut",
  "strut fitting",
  "splice plate",
  "bracket",
  "mount",
  "hole pattern"
 ],
 "aliases": [
  "unistrut splice plate",
  "b129 dimensions",
  "strut splice plate dimensions",
  "unistrut tee plate",
  "strut corner plate",
  "b341 splice plate",
  "p1062 unistrut",
  "strut flat fitting stl",
  "strut plate step",
  "unistrut 4 hole plate"
 ],
 "overall_mm": {
  "length": 184.1,
  "width": 41.3,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 6,
 "url": "https://xemstudio.com/objects/strut-flat-plate-fittings/",
 "sheet_txt": "https://xemstudio.com/objects/strut-flat-plate-fittings/sheet.txt",
 "sheet": {
  "basis": "Eaton B-Line strut fittings catalog section and distributor listings of the same catalog numbers; hole pattern from the B-Line section and the Unistrut P1062 listing",
  "overall_mm": {
   "length": 184.1,
   "width": 41.3,
   "height": null
  },
  "notes": [
   "Flat strut fittings are 1-5/8 in wide steel plates with 9/16 in holes on 1-7/8 in centres, the first hole 13/16 in from the end, so a plate with n holes in a row is (n - 1) × 1-7/8 + 2 × 13/16 in long: 3-1/2, 5-3/8 and 7-1/4 in for 2, 3 and 4 holes, which matches the listed lengths.",
   "Tee (B133) and L corner (B143) plates: overall size and hole count are listed, but the hole layout is not printed, so they are in the table only, with no file. The listings give only overall length, width and hole count; the stem and leg widths of 1-5/8 in and hole positions are taken from the pattern above.",
   "Thickness is not consistent between sources: Unistrut and most distributor listings say 1/4 in, B-Line's fittings section says 7/32 in. Both are drawn for every plate.",
   "Corner radii and any chamfers are not printed, so every file has sharp corners. 2-hole B340 (3-1/4 in) and 3-hole B557 (4-7/8 in) do not fit the 13/16 + 1-7/8 pattern, and the 5-hole cross plate and 3-hole corner plate listings are ambiguous, so none of those is drawn.",
   "Files are Xem-drawn geometry from published numbers, not maker CAD. McMaster-Carr's per-part files are linked, not copied."
  ],
  "table": {
   "columns": [
    "fitting",
    "maker part",
    "overall (L × W)",
    "holes",
    "hole pattern",
    "thickness"
   ],
   "rows": [
    [
     "2-hole splice plate",
     "B-Line B129",
     "3-1/2 × 1-5/8 in",
     "2",
     "9/16 in (14.3 mm), 1-7/8 in (47.6 mm) apart, 13/16 in (20.6 mm) from the end",
     "1/4 (listings) or 7/32 in (B-Line section)"
    ],
    [
     "3-hole splice plate",
     "B-Line B141",
     "5-3/8 × 1-5/8 in",
     "3",
     "9/16 in (14.3 mm), 1-7/8 in (47.6 mm) apart, 13/16 in (20.6 mm) from the end",
     "1/4 (listings) or 7/32 in (B-Line section)"
    ],
    [
     "4-hole splice plate",
     "B-Line B341",
     "7-1/4 × 1-5/8 in",
     "4",
     "9/16 in (14.3 mm), 1-7/8 in (47.6 mm) apart, 13/16 in (20.6 mm) from the end",
     "1/4 (listings) or 7/32 in (B-Line section)"
    ],
    [
     "4-hole tee plate",
     "B-Line B133",
     "5-3/8 × 3-1/2 in",
     "4",
     "9/16 in (14.3 mm), 1-7/8 in (47.6 mm) apart, 13/16 in (20.6 mm) from the end",
     "1/4 (listings) or 7/32 in (B-Line section)"
    ],
    [
     "4-hole L corner plate",
     "B-Line B143",
     "5-3/8 × 3-1/2 in",
     "4",
     "9/16 in (14.3 mm), 1-7/8 in (47.6 mm) apart, 13/16 in (20.6 mm) from the end",
     "1/4 (listings) or 7/32 in (B-Line section)"
    ],
    [
     "1-hole plate",
     "Unistrut P1062",
     "—",
     "1",
     "9/16 in, 13/16 in from the end",
     "1/4 in"
    ],
    [
     "3-hole corner plate, 5-hole cross plate, 2-hole B340 and 3-hole B557 splice plates",
     "B140, B132, B340, B557",
     "listed, not drawn",
     "—",
     "do not follow the plain 13/16 + 1-7/8 pattern or the listing is ambiguous",
     "—"
    ]
   ]
  }
 },
 "sheet_text": "Strut flat plate fittings, 1-5/8 in: splice, tee and L corner plates (B-Line B129, B141, B341, B133, B143) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/strut-flat-plate-fittings/  (sheet CC BY 4.0)\nBasis: Eaton B-Line strut fittings catalog section and distributor listings of the same catalog numbers; hole pattern from the B-Line section and the Unistrut P1062 listing\nCatalog version: 2026-10-20\n\nOverall (mm): length 184.1, width 41.3\n- Flat strut fittings are 1-5/8 in wide steel plates with 9/16 in holes on 1-7/8 in centres, the first hole 13/16 in from the end, so a plate with n holes in a row is (n - 1) × 1-7/8 + 2 × 13/16 in long: 3-1/2, 5-3/8 and 7-1/4 in for 2, 3 and 4 holes, which matches the listed lengths.\n- Tee (B133) and L corner (B143) plates: overall size and hole count are listed, but the hole layout is not printed, so they are in the table only, with no file. The listings give only overall length, width and hole count; the stem and leg widths of 1-5/8 in and hole positions are taken from the pattern above.\n- Thickness is not consistent between sources: Unistrut and most distributor listings say 1/4 in, B-Line's fittings section says 7/32 in. Both are drawn for every plate.\n- Corner radii and any chamfers are not printed, so every file has sharp corners. 2-hole B340 (3-1/4 in) and 3-hole B557 (4-7/8 in) do not fit the 13/16 + 1-7/8 pattern, and the 5-hole cross plate and 3-hole corner plate listings are ambiguous, so none of those is drawn.\n- Files are Xem-drawn geometry from published numbers, not maker CAD. McMaster-Carr's per-part files are linked, not copied.\n\nfitting  maker part  overall (L × W)  holes  hole pattern  thickness\n2-hole splice plate  B-Line B129  3-1/2 × 1-5/8 in  2  9/16 in (14.3 mm), 1-7/8 in (47.6 mm) apart, 13/16 in (20.6 mm) from the end  1/4 (listings) or 7/32 in (B-Line section)\n3-hole splice plate  B-Line B141  5-3/8 × 1-5/8 in  3  9/16 in (14.3 mm), 1-7/8 in (47.6 mm) apart, 13/16 in (20.6 mm) from the end  1/4 (listings) or 7/32 in (B-Line section)\n4-hole splice plate  B-Line B341  7-1/4 × 1-5/8 in  4  9/16 in (14.3 mm), 1-7/8 in (47.6 mm) apart, 13/16 in (20.6 mm) from the end  1/4 (listings) or 7/32 in (B-Line section)\n4-hole tee plate  B-Line B133  5-3/8 × 3-1/2 in  4  9/16 in (14.3 mm), 1-7/8 in (47.6 mm) apart, 13/16 in (20.6 mm) from the end  1/4 (listings) or 7/32 in (B-Line section)\n4-hole L corner plate  B-Line B143  5-3/8 × 3-1/2 in  4  9/16 in (14.3 mm), 1-7/8 in (47.6 mm) apart, 13/16 in (20.6 mm) from the end  1/4 (listings) or 7/32 in (B-Line section)\n1-hole plate  Unistrut P1062  —  1  9/16 in, 13/16 in from the end  1/4 in\n3-hole corner plate, 5-hole cross plate, 2-hole B340 and 3-hole B557 splice plates  B140, B132, B340, B557  listed, not drawn  —  do not follow the plain 13/16 + 1-7/8 pattern or the listing is ambiguous  —\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Eaton B-Line: B-Line series strut systems: Strut fittings catalog section (flat plate, 90° angle, U, Z fittings, post bases) — 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 (Atkore), via distributor AIH: P1062 flat plate fitting: 1 hole, 1-5/8 in wide, 1/4 in thick, 9/16 in hole, 13/16 in from end, 1-7/8 in spacing — web — Publisher's page; dimensions are facts — https://aih.com/Product/UNI0447\n- Steiner Electric (distributor): B-Line B129ZN splice plate: 2 holes, 3-1/2 x 1-5/8 x 1/4 in, 9/16 in holes, 1-7/8 in spacing — web — Publisher's page; dimensions are facts — https://www.steinerelectric.com/Product/B-Line-B129ZN-Splice-Plate-Fitting2-Holes3-1-2-in-L-x-1-5-8-in-W-x-1-4-in-THKSteel-15918\n- Steiner Electric (distributor): B-Line B141ZN splice plate: 3 holes, 5-3/8 x 1-5/8 x 1/4 in — web — Publisher's page; dimensions are facts — https://www.steinerelectric.com/Product/B-Line-B141ZN-Splice-Plate-Fitting3-Holes5-3-8-in-L-x-1-5-8-in-W-x-1-4-in-THKSteel-83305\n- Steiner Electric (distributor): B-Line B341ZN splice plate: 4 holes, 7-1/4 x 1-5/8 x 1/4 in — web — Publisher's page; dimensions are facts — https://www.steinerelectric.com/Product/B-Line-B341ZN-Splice-Plate-Fitting4-Holes7-1-4-in-L-x-1-5-8-in-W-x-1-4-in-THKSteel-15996\n- Steiner Electric (distributor): B-Line B133ZN tee plate: 4 holes, 5-3/8 x 3-1/2 x 1/4 in — web — Publisher's page; dimensions are facts — https://www.steinerelectric.com/Product/B-Line-B133ZN-Tee-Plate-Fitting4-Holes5-3-8-in-L-x-3-1-2-in-W-x-1-4-in-THKSteel-15922\n- Steiner Electric (distributor): B-Line B143ZN flat corner plate: 4 holes, 5-3/8 x 3-1/2 in — web — Publisher's page; dimensions are facts — https://steinerelectric.com/Catalog/ConduitFittings-And-Wireway/Cable-Trays-And-Struts/Strut-Channels-And-Accessories/Channel-Flat-Plate-Fittings/B-Line-B143ZN-Flat-Corner-Plate4-Holes5-3-8-in-L-x-3-1-2-in-WSteel-15928\n- McMaster-Carr: Strut channel fittings (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/strut-channel-fittings/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 6 parts): https://xemstudio.com/files/hardware/strut-flat-plate-fittings/index.json\nAPI: https://xemstudio.com/api/geometry?object=strut-flat-plate-fittings\n",
 "sources": [
  {
   "publisher": "Eaton B-Line",
   "title": "B-Line series strut systems: Strut fittings catalog section (flat plate, 90° angle, U, Z fittings, post bases)",
   "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 (Atkore), via distributor AIH",
   "title": "P1062 flat plate fitting: 1 hole, 1-5/8 in wide, 1/4 in thick, 9/16 in hole, 13/16 in from end, 1-7/8 in spacing",
   "url": "https://aih.com/Product/UNI0447",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Steiner Electric (distributor)",
   "title": "B-Line B129ZN splice plate: 2 holes, 3-1/2 x 1-5/8 x 1/4 in, 9/16 in holes, 1-7/8 in spacing",
   "url": "https://www.steinerelectric.com/Product/B-Line-B129ZN-Splice-Plate-Fitting2-Holes3-1-2-in-L-x-1-5-8-in-W-x-1-4-in-THKSteel-15918",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Steiner Electric (distributor)",
   "title": "B-Line B141ZN splice plate: 3 holes, 5-3/8 x 1-5/8 x 1/4 in",
   "url": "https://www.steinerelectric.com/Product/B-Line-B141ZN-Splice-Plate-Fitting3-Holes5-3-8-in-L-x-1-5-8-in-W-x-1-4-in-THKSteel-83305",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Steiner Electric (distributor)",
   "title": "B-Line B341ZN splice plate: 4 holes, 7-1/4 x 1-5/8 x 1/4 in",
   "url": "https://www.steinerelectric.com/Product/B-Line-B341ZN-Splice-Plate-Fitting4-Holes7-1-4-in-L-x-1-5-8-in-W-x-1-4-in-THKSteel-15996",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Steiner Electric (distributor)",
   "title": "B-Line B133ZN tee plate: 4 holes, 5-3/8 x 3-1/2 x 1/4 in",
   "url": "https://www.steinerelectric.com/Product/B-Line-B133ZN-Tee-Plate-Fitting4-Holes5-3-8-in-L-x-3-1-2-in-W-x-1-4-in-THKSteel-15922",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Steiner Electric (distributor)",
   "title": "B-Line B143ZN flat corner plate: 4 holes, 5-3/8 x 3-1/2 in",
   "url": "https://steinerelectric.com/Catalog/ConduitFittings-And-Wireway/Cable-Trays-And-Struts/Strut-Channels-And-Accessories/Channel-Flat-Plate-Fittings/B-Line-B143ZN-Flat-Corner-Plate4-Holes5-3-8-in-L-x-3-1-2-in-WSteel-15928",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Strut channel fittings (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/strut-channel-fittings/",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "strut-channel-1-5-8",
  "strut-channel-spring-nuts",
  "strut-angle-fittings",
  "strut-u-z-fittings-post-bases"
 ],
 "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 long is a 4-hole strut splice plate?",
   "a": "7-1/4 in (184.2 mm): four 9/16 in holes on 1-7/8 in centres, 13/16 in from each end, 1-5/8 in wide."
  },
  {
   "q": "How thick is a strut splice plate?",
   "a": "1/4 in on Unistrut and most listings, 7/32 in in B-Line's fittings section."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "strut-splice-2-hole-1-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/strut-flat-plate-fittings/strut-splice-2-hole-1-4in.step",
   "stl": "https://xemstudio.com/files/hardware/strut-flat-plate-fittings/strut-splice-2-hole-1-4in.stl",
   "note": "2-hole splice plate (B129 layout), 3-1/2 × 1-5/8 in, 6.35 mm (1/4 in) thick, 2 holes 9/16 in on 1-7/8 in centres, 13/16 in from the ends; sharp corners"
  },
  {
   "file": "strut-splice-2-hole-7-32in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/strut-flat-plate-fittings/strut-splice-2-hole-7-32in.step",
   "stl": "https://xemstudio.com/files/hardware/strut-flat-plate-fittings/strut-splice-2-hole-7-32in.stl",
   "note": "2-hole splice plate (B129 layout), 3-1/2 × 1-5/8 in, 5.56 mm (7/32 in) thick, 2 holes 9/16 in on 1-7/8 in centres, 13/16 in from the ends; sharp corners"
  },
  {
   "file": "strut-splice-3-hole-1-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/strut-flat-plate-fittings/strut-splice-3-hole-1-4in.step",
   "stl": "https://xemstudio.com/files/hardware/strut-flat-plate-fittings/strut-splice-3-hole-1-4in.stl",
   "note": "3-hole splice plate (B141 layout), 5-3/8 × 1-5/8 in, 6.35 mm (1/4 in) thick, 3 holes 9/16 in on 1-7/8 in centres, 13/16 in from the ends; sharp corners"
  },
  {
   "file": "strut-splice-3-hole-7-32in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/strut-flat-plate-fittings/strut-splice-3-hole-7-32in.step",
   "stl": "https://xemstudio.com/files/hardware/strut-flat-plate-fittings/strut-splice-3-hole-7-32in.stl",
   "note": "3-hole splice plate (B141 layout), 5-3/8 × 1-5/8 in, 5.56 mm (7/32 in) thick, 3 holes 9/16 in on 1-7/8 in centres, 13/16 in from the ends; sharp corners"
  },
  {
   "file": "strut-splice-4-hole-1-4in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/strut-flat-plate-fittings/strut-splice-4-hole-1-4in.step",
   "stl": "https://xemstudio.com/files/hardware/strut-flat-plate-fittings/strut-splice-4-hole-1-4in.stl",
   "note": "4-hole splice plate (B341 layout), 7-1/4 × 1-5/8 in, 6.35 mm (1/4 in) thick, 4 holes 9/16 in on 1-7/8 in centres, 13/16 in from the ends; sharp corners"
  },
  {
   "file": "strut-splice-4-hole-7-32in",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/strut-flat-plate-fittings/strut-splice-4-hole-7-32in.step",
   "stl": "https://xemstudio.com/files/hardware/strut-flat-plate-fittings/strut-splice-4-hole-7-32in.stl",
   "note": "4-hole splice plate (B341 layout), 7-1/4 × 1-5/8 in, 5.56 mm (7/32 in) thick, 4 holes 9/16 in on 1-7/8 in centres, 13/16 in from the ends; sharp corners"
  }
 ],
 "markdown": "https://xemstudio.com/objects/strut-flat-plate-fittings/index.md"
}