{
 "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": "linear-rod-8mm",
 "name": "Linear rod Ø8 × 300",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Motion",
 "year": null,
 "question": "What size rod does an LM8UU run on?",
 "tags": [
  "rod",
  "8 mm",
  "linear",
  "lm8uu"
 ],
 "aliases": [
  "8mm linear rod",
  "8mm smooth rod",
  "8mm rod 300mm",
  "linear rod step"
 ],
 "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/linear-rod-8mm/",
 "sheet_txt": "https://xemstudio.com/objects/linear-rod-8mm/sheet.txt",
 "sheet": {
  "basis": "Plain round Ø8 rod at the LM8UU bore",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A plain Ø8 rod, 300 long, square ends.",
   "It carries LM8UU bearings and is held at the ends by SK8 supports.",
   "For Ø8 shafts with D-flats or clip grooves see the metric shafts page."
  ],
  "table": {
   "columns": [
    "file",
    "Ø",
    "length"
   ],
   "rows": [
    [
     "rod-8x300",
     8,
     300
    ]
   ]
  }
 },
 "sheet_text": "Linear rod Ø8 × 300 — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/linear-rod-8mm/  (CC BY 4.0)\nBasis: Plain round Ø8 rod at the LM8UU bore\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A plain Ø8 rod, 300 long, square ends.\n- It carries LM8UU bearings and is held at the ends by SK8 supports.\n- For Ø8 shafts with D-flats or clip grooves see the metric shafts page.\n\nfile  Ø  length\nrod-8x300  8  300\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/linear-rod-8mm/index.json\nAPI: https://xemstudio.com/api/geometry?object=linear-rod-8mm\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": [
  "lm8uu-bearing",
  "rod-support-sk8",
  "metric-shafts",
  "slide-block-sc8uu"
 ],
 "fits": [
  {
   "role": "Parts that fit it",
   "items": [
    {
     "slug": "slide-block-sc8uu",
     "why": "rides the Ø8 rod"
    }
   ]
  },
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "rod-support-sk8",
     "why": "clamped at each end"
    }
   ]
  },
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "lm8uu-bearing",
     "why": "LM8UU slides on it"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "metric-shafts",
     "why": "Ø8 shafts with flats and grooves"
    }
   ]
  }
 ],
 "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": "rod",
   "exact": "Ø8",
   "mates": "LM8UU and 8 mm bores",
   "fit": "slide",
   "files": "rod-8x300"
  }
 ],
 "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 rod fits an LM8UU?",
   "a": "Ø8; this file is Ø8 × 300."
  },
  {
   "q": "What holds the rod ends?",
   "a": "SK8 supports: Ø8 split clamp 20 mm above the base."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "rod-8x300",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/lm8uu-linear-bearing/rod-8x300.step",
   "stl": "https://xemstudio.com/files/hardware/lm8uu-linear-bearing/rod-8x300.stl",
   "note": "8 mm rod, 300 mm"
  }
 ],
 "markdown": "https://xemstudio.com/objects/linear-rod-8mm/index.md"
}