{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "lm8uu-bearing",
 "name": "LM8UU linear bearing Ø8 × Ø15 × 24",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Motion",
 "year": null,
 "question": "What are the LM8UU bearing dimensions?",
 "tags": [
  "linear bearing",
  "lm8uu",
  "8 mm rod",
  "linear motion"
 ],
 "aliases": [
  "lm8uu dimensions",
  "8mm linear bearing",
  "lm8uu step file",
  "lm8uu groove"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/lm8uu-bearing/",
 "sheet_txt": "https://xemstudio.com/objects/lm8uu-bearing/sheet.txt",
 "sheet": {
  "basis": "Industry-standard LM8UU: dr 8, D 15, L 24; retaining-ring grooves 1.1 wide to Ø14.3, outer faces 17.5 apart",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Ø8 bore × Ø15 OD × 24 long.",
   "Two retaining-ring grooves 1.1 wide, down to Ø14.3, with their outer faces 17.5 apart (grooves from 3.25 to 4.35 and 19.65 to 20.75 along the length).",
   "Related sizes: LM8LUU 8 × 15 × 45; LM10UU 10 × 19 × 29; LM12UU 12 × 21 × 30.",
   "The OD sits in a Ø15 housing (the SC8UU block) and the bore slides on an Ø8 rod; fits are under Mating features."
  ],
  "table": {
   "columns": [
    "feature",
    "value_mm"
   ],
   "rows": [
    [
     "bore",
     8
    ],
    [
     "OD",
     15
    ],
    [
     "length",
     24
    ],
    [
     "grooves",
     "1.1 wide to Ø14.3, 17.5 apart (outer faces)"
    ]
   ]
  }
 },
 "sheet_text": "LM8UU linear bearing Ø8 × Ø15 × 24 — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/lm8uu-bearing/  (CC BY 4.0)\nBasis: Industry-standard LM8UU: dr 8, D 15, L 24; retaining-ring grooves 1.1 wide to Ø14.3, outer faces 17.5 apart\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Ø8 bore × Ø15 OD × 24 long.\n- Two retaining-ring grooves 1.1 wide, down to Ø14.3, with their outer faces 17.5 apart (grooves from 3.25 to 4.35 and 19.65 to 20.75 along the length).\n- Related sizes: LM8LUU 8 × 15 × 45; LM10UU 10 × 19 × 29; LM12UU 12 × 21 × 30.\n- The OD sits in a Ø15 housing (the SC8UU block) and the bore slides on an Ø8 rod; fits are under Mating features.\n\nfeature  value_mm\nbore  8\nOD  15\nlength  24\ngrooves  1.1 wide to Ø14.3, 17.5 apart (outer faces)\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- McMaster-Carr: Linear ball bearings (free STEP/IGES/STL per part, for your own design use; no redistribution) — STEP, IGES, STL, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/linear-bearings/\n- Wikipedia: Linear-motion bearing — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Linear-motion_bearing\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/lm8uu-bearing/index.json\nAPI: https://xemstudio.com/api/geometry?object=lm8uu-bearing\n",
 "sources": [
  {
   "publisher": "McMaster-Carr",
   "title": "Linear ball bearings (free STEP/IGES/STL per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/linear-bearings/",
   "formats": [
    "STEP",
    "IGES",
    "STL",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Linear-motion bearing",
   "url": "https://en.wikipedia.org/wiki/Linear-motion_bearing",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "linear-rod-8mm",
  "slide-block-sc8uu",
  "rod-support-sk8",
  "mgn-carriages"
 ],
 "fits": [
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "linear-rod-8mm",
     "why": "Ø8 bore on the rod"
    },
    {
     "slug": "slide-block-sc8uu",
     "why": "Ø15 OD in the block"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "mgn-carriages",
     "why": "rail carriage"
    }
   ]
  }
 ],
 "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": [
  {
   "feature": "bearing OD",
   "exact": "Ø15 × 24",
   "mates": "housing bore",
   "fit": "press",
   "files": "lm8uu"
  },
  {
   "feature": "bore",
   "exact": "Ø8",
   "mates": "8 mm rod (slides on it)",
   "fit": "designed",
   "files": "lm8uu"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. Typical FDM: hole +0.0 to +0.1 mm on diameter.",
  "slide": "assembles by hand and is held by a grub, pinch or clamp: shaft in a hub, rod in a socket, spigot in a bore. Typical FDM: +0.2 mm.",
  "run": "turns or slides in use: pin in a link, rod through a guide. Typical FDM: +0.3 mm.",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. Typical FDM: +0.3 mm.",
  "clamp": "split part that closes on the mating part with screws: make it at size.",
  "designed": "a gap that is part of the design (piston fit option, displacer gap, air gap): do not change."
 },
 "faq": [
  {
   "q": "What are LM8UU dimensions?",
   "a": "8 mm bore, 15 mm OD, 24 mm long, two grooves 1.1 wide to Ø14.3, 17.5 mm apart over their outer faces."
  },
  {
   "q": "What housing bore does an LM8UU take?",
   "a": "Ø15, the bearing OD; the SC8UU block file has it."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "lm8uu",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/lm8uu-linear-bearing/lm8uu.step",
   "stl": "https://xemstudio.com/files/hardware/lm8uu-linear-bearing/lm8uu.stl",
   "note": "LM8UU: Ø8 bore × Ø15 × 24; ring grooves 1.1 wide to Ø14.3, 17.5 apart"
  }
 ],
 "markdown": "https://xemstudio.com/objects/lm8uu-bearing/index.md"
}