{
 "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-spring-nuts",
 "name": "Strut channel nuts (spring nuts) for 1-5/8 in channel: threads, thickness and loads",
 "kind": "standard",
 "category": "Hardware",
 "group": "Framing",
 "year": null,
 "question": "What size are Unistrut / B-Line channel nuts and what loads do they take?",
 "tags": [
  "strut",
  "strut channel",
  "nut",
  "channel nut",
  "spring nut",
  "unistrut",
  "fastener"
 ],
 "aliases": [
  "unistrut nut",
  "unistrut spring nut",
  "strut nut",
  "channel nut 1/2-13",
  "p1010",
  "unistrut nut size",
  "b-line n225",
  "strut spring nut dimensions"
 ],
 "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/strut-channel-spring-nuts/",
 "sheet_txt": "https://xemstudio.com/objects/strut-channel-spring-nuts/sheet.txt",
 "sheet": {
  "basis": "Unistrut Nuts & Hardware catalog pages; Eaton B-Line channel nuts section. Nut width, length and groove sizes are not published, so no file",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A channel nut is a rectangular nut with two grooves across its top: it goes in through the 7/8 in slot, is turned 90°, and the grooves seat on the inturned lips. A spring under it holds it up against the lips while you fit the bolt.",
   "Neither Unistrut nor B-Line publishes the nut's width, length, groove spacing or depth, so Xem draws no nut file: measure a real nut, or design around the channel lip and slot numbers on the channel page.",
   "Deep channels (1-5/8, 1-3/8, 2-7/16, 3-1/4 in) and shallow ones (13/16, 7/8, 1 in) use different spring lengths; check the nut family against the channel height.",
   "Design loads below are the maker's, with a safety factor of at least 3, for 12 ga deep channel."
  ],
  "table": {
   "columns": [
    "thread",
    "nut thickness (B-Line)",
    "pull-out (12 ga deep)",
    "slip (12 ga deep)",
    "recommended bolt torque"
   ],
   "rows": [
    [
     "1/4-20",
     "1/4 in (6.3 mm)",
     "600 lb",
     "300 lb",
     "6 ft·lb (8 N·m)"
    ],
    [
     "5/16-18",
     "—",
     "800 lb",
     "500 lb",
     "11 ft·lb (15 N·m)"
    ],
    [
     "3/8-16",
     "3/8 in (9.5 mm)",
     "1,000 lb",
     "800 lb",
     "19 ft·lb (26 N·m)"
    ],
    [
     "1/2-13",
     "1/2 in (12.7 mm)",
     "2,000 lb",
     "1,500 lb",
     "50 ft·lb (68 N·m)"
    ],
    [
     "5/8-11",
     "—",
     "2,500 lb",
     "1,500 lb",
     "100 ft·lb (136 N·m)"
    ],
    [
     "3/4-10",
     "—",
     "2,500 lb",
     "1,700 lb",
     "125 ft·lb (170 N·m)"
    ]
   ]
  }
 },
 "sheet_text": "Strut channel nuts (spring nuts) for 1-5/8 in channel: threads, thickness and loads — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/strut-channel-spring-nuts/  (sheet CC BY 4.0)\nBasis: Unistrut Nuts & Hardware catalog pages; Eaton B-Line channel nuts section. Nut width, length and groove sizes are not published, so no file\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A channel nut is a rectangular nut with two grooves across its top: it goes in through the 7/8 in slot, is turned 90°, and the grooves seat on the inturned lips. A spring under it holds it up against the lips while you fit the bolt.\n- Neither Unistrut nor B-Line publishes the nut's width, length, groove spacing or depth, so Xem draws no nut file: measure a real nut, or design around the channel lip and slot numbers on the channel page.\n- Deep channels (1-5/8, 1-3/8, 2-7/16, 3-1/4 in) and shallow ones (13/16, 7/8, 1 in) use different spring lengths; check the nut family against the channel height.\n- Design loads below are the maker's, with a safety factor of at least 3, for 12 ga deep channel.\n\nthread  nut thickness (B-Line)  pull-out (12 ga deep)  slip (12 ga deep)  recommended bolt torque\n1/4-20  1/4 in (6.3 mm)  600 lb  300 lb  6 ft·lb (8 N·m)\n5/16-18  —  800 lb  500 lb  11 ft·lb (15 N·m)\n3/8-16  3/8 in (9.5 mm)  1,000 lb  800 lb  19 ft·lb (26 N·m)\n1/2-13  1/2 in (12.7 mm)  2,000 lb  1,500 lb  50 ft·lb (68 N·m)\n5/8-11  —  2,500 lb  1,500 lb  100 ft·lb (136 N·m)\n3/4-10  —  2,500 lb  1,700 lb  125 ft·lb (170 N·m)\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Unistrut (Atkore): 1-5/8\" Framing System catalog: Nuts & Hardware (threads, design loads, bolt torque) — web — Publisher's page; dimensions are facts — https://unistrut.biz/content/CatalogPDFs/1-5-8-ChannelNutsHardware.pdf\n- Eaton B-Line: B-Line series strut systems: Channel nuts & hardware section (thread, nut thickness) — web — Publisher's page; dimensions are facts — https://media.cityelectricsupply.com/media/blinebyeaton/n225-zn-1-2/documents/bline_brochure_929743.pdf\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=strut-channel-spring-nuts\n",
 "sources": [
  {
   "publisher": "Unistrut (Atkore)",
   "title": "1-5/8\" Framing System catalog: Nuts & Hardware (threads, design loads, bolt torque)",
   "url": "https://unistrut.biz/content/CatalogPDFs/1-5-8-ChannelNutsHardware.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 nuts & hardware section (thread, nut thickness)",
   "url": "https://media.cityelectricsupply.com/media/blinebyeaton/n225-zn-1-2/documents/bline_brochure_929743.pdf",
   "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": [
  "strut-channel-1-5-8"
 ],
 "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": "Does Unistrut publish channel nut dimensions?",
   "a": "No: only thread size, weight and loads. B-Line prints the nut thickness (1/4, 3/8, 1/2 in for 1/4-20, 3/8-16, 1/2-13)."
  },
  {
   "q": "What holds a channel nut in strut?",
   "a": "Two grooves across the nut seat on the channel's 9/32 in deep inturned lips; the bolt pulls the nut up against them."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/strut-channel-spring-nuts/index.md"
}