{
 "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": "trailer-hitch-receiver-1-1-4-inch",
 "name": "Trailer hitch receiver, 1-1/4 in square (SAE J684 classes)",
 "kind": "modern",
 "category": "Tools & garage",
 "group": "Hitch receivers",
 "year": null,
 "question": "What are the dimensions of the Trailer hitch receiver, 1-1/4 in square?",
 "tags": [
  "hitch receivers"
 ],
 "aliases": [
  "1-1/4 inch hitch receiver",
  "1-1/4 receiver dimensions",
  "1-1/4 hitch pin size",
  "1-1/4 receiver insert",
  "1-1/4 hitch cover 3d print",
  "1-1/4 hitch receiver size mm",
  "hitch class chart",
  "sae j684 receiver",
  "hitch receiver sizes",
  "receptor enganche 1-1/4 pulgadas",
  "Anhängerkupplung Aufnahme 1-1/4 Zoll"
 ],
 "overall_mm": {
  "length": 31.75,
  "width": 31.75,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/trailer-hitch-receiver-1-1-4-inch/",
 "sheet_txt": "https://xemstudio.com/objects/trailer-hitch-receiver-1-1-4-inch/sheet.txt",
 "sheet": {
  "basis": "Manufacturer specifications (Lippert (CURT))",
  "overall_mm": {
   "length": 31.75,
   "width": 31.75,
   "height": null
  },
  "notes": [
   "A 1-1/4 in receiver takes a 1-1/4 in square shank and a 1/2 in hitch pin, per CURT/Lippert's class and pin guides.",
   "Rated weights depend on the specific hitch; the class figures are the maker's typical ranges.",
   "No CAD file: the maker publishes only overall sizes, and a plain box or cylinder is not useful design geometry. The table is the published data; parts with real geometry have their own pages."
  ],
  "table": {
   "columns": [
    "dimension",
    "value"
   ],
   "rows": [
    [
     "Receiver size",
     "1-1/4 × 1-1/4 in (31.75 mm square)"
    ],
    [
     "Hitch classes",
     "Class 1 (up to 2,000 lb GTW / 200 lb TW) and Class 2 (up to 3,500 lb / 350 lb)"
    ],
    [
     "Hitch pin diameter",
     "1/2 in (12.7 mm)"
    ],
    [
     "Minimum usable pin length (excl. handle)",
     "2 in (50.8 mm)"
    ]
   ]
  }
 },
 "sheet_text": "Trailer hitch receiver, 1-1/4 in square (SAE J684 classes) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/trailer-hitch-receiver-1-1-4-inch/  (sheet CC BY 4.0)\nBasis: Manufacturer specifications (Lippert (CURT))\nCatalog version: 2026-10-20\n\nOverall (mm): length 31.75, width 31.75\n- A 1-1/4 in receiver takes a 1-1/4 in square shank and a 1/2 in hitch pin, per CURT/Lippert's class and pin guides.\n- Rated weights depend on the specific hitch; the class figures are the maker's typical ranges.\n- No CAD file: the maker publishes only overall sizes, and a plain box or cylinder is not useful design geometry. The table is the published data; parts with real geometry have their own pages.\n\ndimension  value\nReceiver size  1-1/4 × 1-1/4 in (31.75 mm square)\nHitch classes  Class 1 (up to 2,000 lb GTW / 200 lb TW) and Class 2 (up to 3,500 lb / 350 lb)\nHitch pin diameter  1/2 in (12.7 mm)\nMinimum usable pin length (excl. handle)  2 in (50.8 mm)\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Lippert (CURT): A Beginner's Guide to Hitch Classes — web — Publisher's page; dimensions are facts — https://www.lippert.com/blog/a-beginners-guide-to-hitch-classes\n- Lippert (CURT): Guide to Hitch Pin Sizes — web — Publisher's page; dimensions are facts — https://www.lippert.com/blog/guide-to-hitch-pin-sizes\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=trailer-hitch-receiver-1-1-4-inch\n",
 "sources": [
  {
   "publisher": "Lippert (CURT)",
   "title": "A Beginner's Guide to Hitch Classes",
   "url": "https://www.lippert.com/blog/a-beginners-guide-to-hitch-classes",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Lippert (CURT)",
   "title": "Guide to Hitch Pin Sizes",
   "url": "https://www.lippert.com/blog/guide-to-hitch-pin-sizes",
   "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": [
  "trailer-hitch-receiver-2-inch",
  "trailer-hitch-receiver-2-1-2-inch",
  "trailer-hitch-receiver-3-inch"
 ],
 "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 pin fits a 1-1/4 in receiver?",
   "a": "A 1/2 in (12.7 mm) pin with at least 2 in usable length."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/trailer-hitch-receiver-1-1-4-inch/index.md"
}