{
 "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": "rod-support-sk8",
 "name": "SK8 rod support for Ø8 rods",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Motion",
 "year": null,
 "question": "What are the dimensions of an SK8 shaft support?",
 "tags": [
  "rod support",
  "sk8",
  "shaft support",
  "8 mm rod",
  "linear",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "sk8 dimensions",
  "sk8 shaft support",
  "8mm rod holder",
  "sk8 stl",
  "shaft clamp 8mm"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/rod-support-sk8/",
 "sheet_txt": "https://xemstudio.com/objects/rod-support-sk8/sheet.txt",
 "sheet": {
  "basis": "SK8 catalogue dimensions: 42 × 14 base, Ø8 rod at 20 mm, M5 base holes 32 apart, M4 pinch screw",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A 42 × 14 block, 32 tall in the middle and 27 at the two stepped ends, with a Ø8 bore across the 14 mm thickness 20 mm above the base.",
   "A 1.5 mm slot runs from the bore up through the top; an M4 pinch screw closes it on the rod: Ø4.5 clearance on one side of the slot, Ø3.3 tap drill on the other, 28 mm above the base.",
   "Two Ø5.5 holes (M5 clearance) through the stepped ends, 32 mm apart."
  ],
  "table": {
   "columns": [
    "feature",
    "value_mm"
   ],
   "rows": [
    [
     "base",
     "42 × 14"
    ],
    [
     "height",
     "32 (27 at the ends)"
    ],
    [
     "rod bore",
     "Ø8 at 20"
    ],
    [
     "clamp slot",
     1.5
    ],
    [
     "pinch screw",
     "M4: Ø4.5 / Ø3.3 at 28"
    ],
    [
     "base holes",
     "2 × Ø5.5 at 32"
    ]
   ]
  }
 },
 "sheet_text": "SK8 rod support for Ø8 rods — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/rod-support-sk8/  (CC BY 4.0)\nBasis: SK8 catalogue dimensions: 42 × 14 base, Ø8 rod at 20 mm, M5 base holes 32 apart, M4 pinch screw\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A 42 × 14 block, 32 tall in the middle and 27 at the two stepped ends, with a Ø8 bore across the 14 mm thickness 20 mm above the base.\n- A 1.5 mm slot runs from the bore up through the top; an M4 pinch screw closes it on the rod: Ø4.5 clearance on one side of the slot, Ø3.3 tap drill on the other, 28 mm above the base.\n- Two Ø5.5 holes (M5 clearance) through the stepped ends, 32 mm apart.\n\nfeature  value_mm\nbase  42 × 14\nheight  32 (27 at the ends)\nrod bore  Ø8 at 20\nclamp slot  1.5\npinch screw  M4: Ø4.5 / Ø3.3 at 28\nbase holes  2 × Ø5.5 at 32\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- McMaster-Carr: Mounted bearings (free STEP per part, for your own design use; no redistribution) — STEP, PDF — McMaster-Carr site terms [verify license at link] — https://www.mcmaster.com/products/mounted-ball-bearings/\n- McMaster-Carr: Sleeve bearings (free STEP per part, for your own design use; no redistribution) — STEP, PDF — McMaster-Carr site terms [verify license at link] — https://www.mcmaster.com/products/sleeve-bearings/\n- OpenBuilds: Solid V wheel kit — web, STEP — OpenBuilds site [verify license at link] — https://openbuildspartstore.com/solid-v-wheel-kit/\n- Wikipedia: Plain bearing — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Plain_bearing\n- Long Earth Society: Engine and rig builds — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/rod-support-sk8/index.json\nAPI: https://xemstudio.com/api/geometry?object=rod-support-sk8\n",
 "sources": [
  {
   "publisher": "McMaster-Carr",
   "title": "Mounted bearings (free STEP per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/mounted-ball-bearings/",
   "formats": [
    "STEP",
    "PDF"
   ],
   "license": "McMaster-Carr site terms",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Sleeve bearings (free STEP per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/sleeve-bearings/",
   "formats": [
    "STEP",
    "PDF"
   ],
   "license": "McMaster-Carr site terms",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "OpenBuilds",
   "title": "Solid V wheel kit",
   "url": "https://openbuildspartstore.com/solid-v-wheel-kit/",
   "formats": [
    "web",
    "STEP"
   ],
   "license": "OpenBuilds site",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Plain bearing",
   "url": "https://en.wikipedia.org/wiki/Plain_bearing",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Engine and rig builds",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
   ],
   "license": "LES site",
   "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",
  "lm8uu-bearing",
  "slide-block-sc8uu",
  "pillow-block-kp08"
 ],
 "fits": [
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "linear-rod-8mm",
     "why": "Ø8 rod clamped in the bore"
    },
    {
     "slug": "slide-block-sc8uu",
     "why": "carriage on the same rod"
    }
   ]
  },
  {
   "role": "Also needed",
   "items": [
    {
     "slug": "lm8uu-bearing",
     "why": "rides on the rod between two supports"
    }
   ]
  }
 ],
 "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 clamp bore",
   "exact": "Ø8",
   "mates": "Ø8 rod; the 1.5 split closes on it",
   "fit": "clamp",
   "files": "rod-support-"
  },
  {
   "feature": "pinch screw holes",
   "exact": "Ø4.5 / Ø3.3",
   "mates": "M4 clearance / M4 tap drill",
   "fit": "designed",
   "files": "rod-support-"
  },
  {
   "feature": "base holes",
   "exact": "Ø5.5",
   "mates": "M5 screw clearance",
   "fit": "designed",
   "files": "rod-support-"
  }
 ],
 "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 SK8 dimensions?",
   "a": "42 × 14 base, 32 tall, Ø8 rod 20 mm above the base, two M5 holes 32 mm apart, M4 pinch screw."
  },
  {
   "q": "How does an SK8 hold the rod?",
   "a": "A 1.5 mm slot from the bore to the top; the M4 screw across it closes the bore on the Ø8 rod."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "rod-support-sk8",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/bearing-housings-and-rod-supports/rod-support-sk8.step",
   "stl": "https://xemstudio.com/files/hardware/bearing-housings-and-rod-supports/rod-support-sk8.stl",
   "note": "SK8 rod support: Ø8 split clamp, 20 mm centre height, two Ø5.5 (M5 clearance) base holes 32 mm apart, M4 pinch (Ø4.5 clearance / Ø3.3 tap drill)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/rod-support-sk8/index.md"
}