{
 "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": "sk-shaft-supports",
 "name": "SK shaft supports SK8–SK60: centre height, base, bolt spacing and hole size for linear rods",
 "kind": "standard",
 "category": "Hardware",
 "group": "Bearings, rails & motion",
 "year": null,
 "question": "What are the SK8 to SK60 shaft support dimensions: centre height, width, base, bolt spacing and bolt hole?",
 "tags": [
  "sk8",
  "sk shaft support",
  "linear rod support",
  "shaft holder",
  "rod clamp block",
  "linear shaft support",
  "cnc rod support",
  "sk20"
 ],
 "aliases": [
  "sk8 dimensions",
  "sk8 shaft support centre height",
  "sk10 shaft support",
  "sk12 dimensions",
  "sk16 bolt spacing",
  "sk20 shaft support dimensions",
  "sk25 dimensions",
  "sk30 shaft support",
  "8mm rod support bracket",
  "linear rail shaft support sk8 drawing"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 7,
 "url": "https://xemstudio.com/objects/sk-shaft-supports/",
 "sheet_txt": "https://xemstudio.com/objects/sk-shaft-supports/sheet.txt",
 "sheet": {
  "basis": "Wangong's SK series table (manufacturer datasheet, hosted by Phidgets) checked against the Motion-and-Drives and Handsontec SK tables, which carry identical values",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Dimensions are exact nominal, true size, no tolerance added. Shaft axis horizontal, base flat on the mounting surface. h = shaft centre height above the base (±0.02 on Wangong's drawing), A = width, B = length along the shaft, C = overall height, E = base thickness, F = width of the upright clamp body, R = bolt spacing, T = bolt hole diameter. A/2 is the datum from the side face to the shaft centre (±0.05).",
   "SK8 and SK10 share one housing (42 wide, 20 centre height, 32 bolt spacing); so do SK12 and SK13. Only the bore differs.",
   "The files model the base plate, the upright clamp body, the shaft bore at h and the two vertical bolt holes. Not modelled: the clamp slit and pinch screw (position not tabled) and the rounded top corners (radius not published), so the top is drawn square.",
   "Wangong's table also prints a column S (5 to 14 mm) that its text does not define; it is listed as printed and not used in the files.",
   "Files: sk-shaft-supports--sk8, sk-shaft-supports--sk10, sk-shaft-supports--sk12, sk-shaft-supports--sk16, sk-shaft-supports--sk20, sk-shaft-supports--sk25, sk-shaft-supports--sk30."
  ],
  "table": {
   "columns": [
    "size",
    "shaft d",
    "h centre height",
    "A width",
    "B length",
    "C height",
    "E base",
    "F upright",
    "R bolt spacing",
    "T hole",
    "S (undefined)",
    "clamp bolt",
    "mounting bolt",
    "mass g"
   ],
   "rows": [
    [
     "SK8",
     "8",
     "20",
     "42",
     "14",
     "32.8",
     "6",
     "18",
     "32",
     "5.5",
     "5",
     "M4",
     "M5",
     "24"
    ],
    [
     "SK10",
     "10",
     "20",
     "42",
     "14",
     "32.8",
     "6",
     "18",
     "32",
     "5.5",
     "5",
     "M4",
     "M5",
     "24"
    ],
    [
     "SK12",
     "12",
     "23",
     "42",
     "14",
     "37.5",
     "6",
     "20",
     "32",
     "5.5",
     "5",
     "M4",
     "M5",
     "30"
    ],
    [
     "SK13",
     "13",
     "23",
     "42",
     "14",
     "37.5",
     "6",
     "20",
     "32",
     "5.5",
     "5",
     "M4",
     "M5",
     "30"
    ],
    [
     "SK16",
     "16",
     "27",
     "48",
     "16",
     "44",
     "8",
     "25",
     "38",
     "5.5",
     "5",
     "M4",
     "M5",
     "40"
    ],
    [
     "SK20",
     "20",
     "31",
     "60",
     "20",
     "51",
     "10",
     "30",
     "45",
     "6.6",
     "7.5",
     "M5",
     "M6",
     "70"
    ],
    [
     "SK25",
     "25",
     "35",
     "70",
     "24",
     "60",
     "12",
     "38",
     "56",
     "6.6",
     "7",
     "M6",
     "M6",
     "130"
    ],
    [
     "SK30",
     "30",
     "42",
     "84",
     "28",
     "70",
     "12",
     "44",
     "64",
     "9",
     "10",
     "M6",
     "M8",
     "180"
    ],
    [
     "SK35",
     "35",
     "50",
     "98",
     "32",
     "82",
     "15",
     "50",
     "74",
     "11",
     "12",
     "M8",
     "M10",
     "270"
    ],
    [
     "SK40",
     "40",
     "60",
     "114",
     "36",
     "96",
     "15",
     "60",
     "90",
     "11",
     "12",
     "M8",
     "M10",
     "420"
    ],
    [
     "SK50",
     "50",
     "70",
     "126",
     "40",
     "120",
     "18",
     "74",
     "100",
     "14",
     "13",
     "M12",
     "M12",
     "750"
    ],
    [
     "SK60",
     "60",
     "80",
     "148",
     "45",
     "136",
     "18",
     "90",
     "120",
     "14",
     "14",
     "M12",
     "M12",
     "1100"
    ]
   ]
  }
 },
 "sheet_text": "SK shaft supports SK8–SK60: centre height, base, bolt spacing and hole size for linear rods — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/sk-shaft-supports/  (sheet CC BY 4.0)\nBasis: Wangong's SK series table (manufacturer datasheet, hosted by Phidgets) checked against the Motion-and-Drives and Handsontec SK tables, which carry identical values\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Dimensions are exact nominal, true size, no tolerance added. Shaft axis horizontal, base flat on the mounting surface. h = shaft centre height above the base (±0.02 on Wangong's drawing), A = width, B = length along the shaft, C = overall height, E = base thickness, F = width of the upright clamp body, R = bolt spacing, T = bolt hole diameter. A/2 is the datum from the side face to the shaft centre (±0.05).\n- SK8 and SK10 share one housing (42 wide, 20 centre height, 32 bolt spacing); so do SK12 and SK13. Only the bore differs.\n- The files model the base plate, the upright clamp body, the shaft bore at h and the two vertical bolt holes. Not modelled: the clamp slit and pinch screw (position not tabled) and the rounded top corners (radius not published), so the top is drawn square.\n- Wangong's table also prints a column S (5 to 14 mm) that its text does not define; it is listed as printed and not used in the files.\n- Files: sk-shaft-supports--sk8, sk-shaft-supports--sk10, sk-shaft-supports--sk12, sk-shaft-supports--sk16, sk-shaft-supports--sk20, sk-shaft-supports--sk25, sk-shaft-supports--sk30.\n\nsize  shaft d  h centre height  A width  B length  C height  E base  F upright  R bolt spacing  T hole  S (undefined)  clamp bolt  mounting bolt  mass g\nSK8  8  20  42  14  32.8  6  18  32  5.5  5  M4  M5  24\nSK10  10  20  42  14  32.8  6  18  32  5.5  5  M4  M5  24\nSK12  12  23  42  14  37.5  6  20  32  5.5  5  M4  M5  30\nSK13  13  23  42  14  37.5  6  20  32  5.5  5  M4  M5  30\nSK16  16  27  48  16  44  8  25  38  5.5  5  M4  M5  40\nSK20  20  31  60  20  51  10  30  45  6.6  7.5  M5  M6  70\nSK25  25  35  70  24  60  12  38  56  6.6  7  M6  M6  130\nSK30  30  42  84  28  70  12  44  64  9  10  M6  M8  180\nSK35  35  50  98  32  82  15  50  74  11  12  M8  M10  270\nSK40  40  60  114  36  96  15  60  90  11  12  M8  M10  420\nSK50  50  70  126  40  120  18  74  100  14  13  M12  M12  750\nSK60  60  80  148  45  136  18  90  120  14  14  M12  M12  1100\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wangong (manufacturer datasheet, hosted by Phidgets): Linear guide products: SHF and SK series shaft supports (LMN4221_0 datasheet) — web — Publisher's page; dimensions are facts — https://phidgets.com/productfiles/LMN4221/LMN4221_0/Documentation/LMN4221_0_DataSheet.pdf\n- Motion-and-Drives: SK steel shaft supports technical specification — web — Publisher's page; dimensions are facts — https://cdn.shopify.com/s/files/1/0509/9690/4105/files/SK_supports_technical_specification.pdf\n- Handsontec: SK shaft holder data sheet — web — Publisher's page; dimensions are facts — https://handsontec.com/dataspecs/sk-shaft-holder.pdf\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 7 parts): https://xemstudio.com/files/hardware/sk-shaft-supports/index.json\nAPI: https://xemstudio.com/api/geometry?object=sk-shaft-supports\n",
 "sources": [
  {
   "publisher": "Wangong (manufacturer datasheet, hosted by Phidgets)",
   "title": "Linear guide products: SHF and SK series shaft supports (LMN4221_0 datasheet)",
   "url": "https://phidgets.com/productfiles/LMN4221/LMN4221_0/Documentation/LMN4221_0_DataSheet.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Motion-and-Drives",
   "title": "SK steel shaft supports technical specification",
   "url": "https://cdn.shopify.com/s/files/1/0509/9690/4105/files/SK_supports_technical_specification.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Handsontec",
   "title": "SK shaft holder data sheet",
   "url": "https://handsontec.com/dataspecs/sk-shaft-holder.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "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-ball-bushings-lm-uu-luu",
  "lm8uu-bearing",
  "pillow-block-kp08",
  "flanged-linear-bushings-lmf-lmk-lmh",
  "socket-head-cap-screws-metric"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no tolerance added)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no tolerance added. 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. Typical accuracy by process and ISO 286 fits: https://xemstudio.com/tolerances/",
 "mating": [
  {
   "feature": "bore",
   "exact": "d (SK8 8, SK12 12, SK20 20)",
   "mates": "linear shaft of the same nominal diameter",
   "fit": "clamp",
   "files": "all"
  },
  {
   "feature": "bolt holes",
   "exact": "T on R (SK8 5.5 on 32, SK20 6.6 on 45)",
   "mates": "M5 / M6 / M8 bolts into the frame or extrusion",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "centre height",
   "exact": "h (SK8 20, SK16 27)",
   "mates": "matching bearing block centre height on the carriage",
   "fit": "designed",
   "files": "all"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. ISO 286 equivalent: H7/p6 (locational interference) or tighter.",
  "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. ISO 286 equivalent: H7/g6 or H7/h6.",
  "run": "turns or slides in use: pin in a link, rod through a guide. ISO 286 equivalent: H8/f7 (close running).",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. ISO 286 equivalent: H9/d9 (free running) or looser.",
  "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 is the SK8 centre height?",
   "a": "20 mm from the base to the shaft centre; SK8 is 42 wide, 14 long, 32.8 tall, with two 5.5 mm holes 32 mm apart for M5."
  },
  {
   "q": "Are SK8 and SK10 the same size?",
   "a": "Yes, same 42 × 14 × 32.8 housing, 20 mm centre height and 32 mm bolt spacing; only the bore changes (8 or 10 mm)."
  },
  {
   "q": "What are the SK20 dimensions?",
   "a": "Centre height 31, width 60, length 20, height 51, base 10 thick, two 6.6 mm holes 45 mm apart for M6, M5 clamp screw."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "sk-shaft-supports--sk10",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk10.step",
   "stl": "https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk10.stl",
   "note": "SK10 shaft support for Ø10 mm rod (Wangong SK series, mounting reference)"
  },
  {
   "file": "sk-shaft-supports--sk12",
   "formats": [
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    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk12.step",
   "stl": "https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk12.stl",
   "note": "SK12 shaft support for Ø12 mm rod (Wangong SK series, mounting reference)"
  },
  {
   "file": "sk-shaft-supports--sk16",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk16.step",
   "stl": "https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk16.stl",
   "note": "SK16 shaft support for Ø16 mm rod (Wangong SK series, mounting reference)"
  },
  {
   "file": "sk-shaft-supports--sk20",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk20.step",
   "stl": "https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk20.stl",
   "note": "SK20 shaft support for Ø20 mm rod (Wangong SK series, mounting reference)"
  },
  {
   "file": "sk-shaft-supports--sk25",
   "formats": [
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    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk25.step",
   "stl": "https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk25.stl",
   "note": "SK25 shaft support for Ø25 mm rod (Wangong SK series, mounting reference)"
  },
  {
   "file": "sk-shaft-supports--sk30",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk30.step",
   "stl": "https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk30.stl",
   "note": "SK30 shaft support for Ø30 mm rod (Wangong SK series, mounting reference)"
  },
  {
   "file": "sk-shaft-supports--sk8",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk8.step",
   "stl": "https://xemstudio.com/files/hardware/sk-shaft-supports/sk-shaft-supports--sk8.stl",
   "note": "SK8 shaft support for Ø8 mm rod (Wangong SK series, mounting reference)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/sk-shaft-supports/index.md"
}