{
 "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": "linear-ball-bushings-lm-uu-luu",
 "name": "Linear ball bushings LM..UU and LM..LUU (LM8UU, LM10UU, LM12UU, LM16UU, LM20UU, long LUU): bore, OD, length, ring-groove numbers",
 "kind": "standard",
 "category": "Hardware",
 "group": "Bearings, rails & motion",
 "year": null,
 "question": "What are the dimensions of LM8UU, LM10UU, LM12UU, LM16UU, LM20UU and the long LM8LUU, LM10LUU, LM12LUU linear bearings: bore, OD, length and snap-ring groove?",
 "tags": [
  "linear bearing",
  "lm8uu",
  "lm10uu",
  "lm12uu",
  "lm16uu",
  "lm20uu",
  "lm8luu",
  "ball bushing",
  "linear bushing",
  "3d printer",
  "smooth rod"
 ],
 "aliases": [
  "lm8uu dimensions",
  "lm10uu dimensions",
  "lm12uu dimensions",
  "lm16uu dimensions",
  "lm20uu dimensions",
  "lm8luu dimensions",
  "lm10luu",
  "lm12luu",
  "lm16luu",
  "lm20luu",
  "lm8uu ring groove",
  "lm8uu snap ring groove",
  "linear bearing 8mm groove diameter",
  "lm8uu 8x15x24",
  "lm10uu 10x19x29",
  "lm12uu 12x21x30",
  "lm6uu dimensions",
  "lm13uu"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "not-scanned",
 "les": false,
 "free_files": 0,
 "url": "https://xemstudio.com/objects/linear-ball-bushings-lm-uu-luu/",
 "sheet_txt": "https://xemstudio.com/objects/linear-ball-bushings-lm-uu-luu/sheet.txt",
 "sheet": {
  "basis": "A Japanese-standard catalogue (DriveHQ) for d, D, L, B, W, D1, checked against WF International, Samick, Tuli, THK and McMaster; disagreements listed; McMaster-Carr linked for CAD",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "The LM..UU linear ball bushing (linear bearing, ball bushing, 'LM8UU') is the cylindrical bushing on every 3D printer smooth rod and many CNC axes: the bore d is the shaft diameter, D the outside diameter, UU means a wiper seal at each end, L (long) doubles the ball set (LM8LUU is 45 long against 24). Two snap-ring grooves in the OD, groove width W and groove diameter D1, hold it in a housing with circlips.",
   "Numbers: the DriveHQ catalogue (maker not named, Japanese-standard dimensions) for d, D, L, B, W, D1. For LM8 to LM60, D and L equal the flanged LMF bodies on the flanged-bushing page (Samick, Tuli, THK, McMaster); for LM..LUU the DriveHQ table, WF International (L, W, D1) and a Misumi catalogue page (L, B, W, D1) agree on every row except L at 40 and 60 mm (see below), and Samick's LMF..L agrees on L. LM3UU and LM4UU come from CWL Bearing (d, D, L only).",
   "B is shown as printed and not defined in the sources' text (it is a dimension between the two grooves in the drawing). Misumi's own C-LMU series prints different B values (15.3 for the 8 mm bushing against 17.5 here), so B is catalogue-specific; because of that the grooves are not drawn in any file. The groove width W and groove diameter D1 are the same in every catalogue read where they could be matched (1.1 and 14.3 for LM8; 1.3 and 18 for LM10).",
   "Disagreements: LM40LUU is 154 (DriveHQ, WF International, Samick) against 151 (the Misumi catalogue page, Tuli LMK40LUU) and LM60LUU 211 against 209 (also McMaster's 60 mm flanged part). CWL Bearing prints LM6UU as 17 long and LM8SUU as 19; the DriveHQ, Samick and THK tables say LM6UU is 19 and LM8SUU is 17, so CWL's two rows are not used.",
   "Files: none on this page (a plain bushing with the grooves in unknown positions would be invented geometry). The flanged-bushing page has 20 solids built from the same d, D, L; for a plain press-in bushing use the bore d and OD D here. The existing LM8UU / 8 mm rod page has the 8 mm case.",
   "Left out: LM..UU above 60 mm, load ratings and tolerance grades (THK's housing bore tolerance table is H7 / J7 / H6 / J6 / K6 and its shaft table f6 / g6 / h6 / f5 / g5 / h5 / h7 / k6, mentioned in the mating table, not tabulated by size)."
  ],
  "table": {
   "columns": [
    "designation",
    "bore d (shaft Ø), mm",
    "OD D, mm",
    "length L, mm",
    "B (as printed), mm",
    "ring-groove width W, mm",
    "ring-groove Ø D1, mm"
   ],
   "rows": [
    [
     "LM3UU",
     "3",
     "7",
     "10",
     "—",
     "—",
     "—"
    ],
    [
     "LM4UU",
     "4",
     "8",
     "12",
     "—",
     "—",
     "—"
    ],
    [
     "LM5UU",
     "5",
     "10",
     "15",
     "10.2",
     "1.1",
     "9.6"
    ],
    [
     "LM6UU",
     "6",
     "12",
     "19",
     "13.5",
     "1.1",
     "11.5"
    ],
    [
     "LM8SUU",
     "8",
     "15",
     "17",
     "11.5",
     "1.1",
     "14.3"
    ],
    [
     "LM8UU",
     "8",
     "15",
     "24",
     "17.5",
     "1.1",
     "14.3"
    ],
    [
     "LM10UU",
     "10",
     "19",
     "29",
     "22",
     "1.3",
     "18"
    ],
    [
     "LM12UU",
     "12",
     "21",
     "30",
     "23",
     "1.3",
     "20"
    ],
    [
     "LM13UU",
     "13",
     "23",
     "32",
     "23",
     "1.3",
     "22"
    ],
    [
     "LM16UU",
     "16",
     "28",
     "37",
     "26.5",
     "1.6",
     "27"
    ],
    [
     "LM20UU",
     "20",
     "32",
     "42",
     "30.5",
     "1.6",
     "30.5"
    ],
    [
     "LM25UU",
     "25",
     "40",
     "59",
     "41",
     "1.85",
     "38"
    ],
    [
     "LM30UU",
     "30",
     "45",
     "64",
     "44.5",
     "1.85",
     "43"
    ],
    [
     "LM35UU",
     "35",
     "52",
     "70",
     "49.5",
     "2.1",
     "49"
    ],
    [
     "LM40UU",
     "40",
     "60",
     "80",
     "60.5",
     "2.1",
     "57"
    ],
    [
     "LM50UU",
     "50",
     "80",
     "100",
     "74",
     "2.6",
     "76.5"
    ],
    [
     "LM60UU",
     "60",
     "90",
     "110",
     "85",
     "3.15",
     "86.5"
    ],
    [
     "LM6LUU (long)",
     "6",
     "12",
     "35",
     "27",
     "1.1",
     "11.5"
    ],
    [
     "LM8LUU (long)",
     "8",
     "15",
     "45",
     "35",
     "1.1",
     "14.3"
    ],
    [
     "LM10LUU (long)",
     "10",
     "19",
     "55",
     "44",
     "1.3",
     "18"
    ],
    [
     "LM12LUU (long)",
     "12",
     "21",
     "57",
     "46",
     "1.3",
     "20"
    ],
    [
     "LM13LUU (long)",
     "13",
     "23",
     "61",
     "46",
     "1.3",
     "22"
    ],
    [
     "LM16LUU (long)",
     "16",
     "28",
     "70",
     "53",
     "1.6",
     "27"
    ],
    [
     "LM20LUU (long)",
     "20",
     "32",
     "80",
     "61",
     "1.6",
     "30.5"
    ],
    [
     "LM25LUU (long)",
     "25",
     "40",
     "112",
     "82",
     "1.85",
     "38"
    ],
    [
     "LM30LUU (long)",
     "30",
     "45",
     "123",
     "89",
     "1.85",
     "43"
    ],
    [
     "LM35LUU (long)",
     "35",
     "52",
     "135",
     "99",
     "2.1",
     "49"
    ],
    [
     "LM40LUU (long)",
     "40",
     "60",
     "154",
     "121",
     "2.1",
     "57"
    ],
    [
     "LM50LUU (long)",
     "50",
     "80",
     "192",
     "148",
     "2.6",
     "76.5"
    ],
    [
     "LM60LUU (long)",
     "60",
     "90",
     "211",
     "170",
     "3.15",
     "86.5"
    ]
   ]
  }
 },
 "sheet_text": "Linear ball bushings LM..UU and LM..LUU (LM8UU, LM10UU, LM12UU, LM16UU, LM20UU, long LUU): bore, OD, length, ring-groove numbers — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/linear-ball-bushings-lm-uu-luu/  (sheet CC BY 4.0)\nBasis: A Japanese-standard catalogue (DriveHQ) for d, D, L, B, W, D1, checked against WF International, Samick, Tuli, THK and McMaster; disagreements listed; McMaster-Carr linked for CAD\nCatalog version: 2026-10-20\n\nSizes: see table below\n- The LM..UU linear ball bushing (linear bearing, ball bushing, 'LM8UU') is the cylindrical bushing on every 3D printer smooth rod and many CNC axes: the bore d is the shaft diameter, D the outside diameter, UU means a wiper seal at each end, L (long) doubles the ball set (LM8LUU is 45 long against 24). Two snap-ring grooves in the OD, groove width W and groove diameter D1, hold it in a housing with circlips.\n- Numbers: the DriveHQ catalogue (maker not named, Japanese-standard dimensions) for d, D, L, B, W, D1. For LM8 to LM60, D and L equal the flanged LMF bodies on the flanged-bushing page (Samick, Tuli, THK, McMaster); for LM..LUU the DriveHQ table, WF International (L, W, D1) and a Misumi catalogue page (L, B, W, D1) agree on every row except L at 40 and 60 mm (see below), and Samick's LMF..L agrees on L. LM3UU and LM4UU come from CWL Bearing (d, D, L only).\n- B is shown as printed and not defined in the sources' text (it is a dimension between the two grooves in the drawing). Misumi's own C-LMU series prints different B values (15.3 for the 8 mm bushing against 17.5 here), so B is catalogue-specific; because of that the grooves are not drawn in any file. The groove width W and groove diameter D1 are the same in every catalogue read where they could be matched (1.1 and 14.3 for LM8; 1.3 and 18 for LM10).\n- Disagreements: LM40LUU is 154 (DriveHQ, WF International, Samick) against 151 (the Misumi catalogue page, Tuli LMK40LUU) and LM60LUU 211 against 209 (also McMaster's 60 mm flanged part). CWL Bearing prints LM6UU as 17 long and LM8SUU as 19; the DriveHQ, Samick and THK tables say LM6UU is 19 and LM8SUU is 17, so CWL's two rows are not used.\n- Files: none on this page (a plain bushing with the grooves in unknown positions would be invented geometry). The flanged-bushing page has 20 solids built from the same d, D, L; for a plain press-in bushing use the bore d and OD D here. The existing LM8UU / 8 mm rod page has the 8 mm case.\n- Left out: LM..UU above 60 mm, load ratings and tolerance grades (THK's housing bore tolerance table is H7 / J7 / H6 / J6 / K6 and its shaft table f6 / g6 / h6 / f5 / g5 / h5 / h7 / k6, mentioned in the mating table, not tabulated by size).\n\ndesignation  bore d (shaft Ø), mm  OD D, mm  length L, mm  B (as printed), mm  ring-groove width W, mm  ring-groove Ø D1, mm\nLM3UU  3  7  10  —  —  —\nLM4UU  4  8  12  —  —  —\nLM5UU  5  10  15  10.2  1.1  9.6\nLM6UU  6  12  19  13.5  1.1  11.5\nLM8SUU  8  15  17  11.5  1.1  14.3\nLM8UU  8  15  24  17.5  1.1  14.3\nLM10UU  10  19  29  22  1.3  18\nLM12UU  12  21  30  23  1.3  20\nLM13UU  13  23  32  23  1.3  22\nLM16UU  16  28  37  26.5  1.6  27\nLM20UU  20  32  42  30.5  1.6  30.5\nLM25UU  25  40  59  41  1.85  38\nLM30UU  30  45  64  44.5  1.85  43\nLM35UU  35  52  70  49.5  2.1  49\nLM40UU  40  60  80  60.5  2.1  57\nLM50UU  50  80  100  74  2.6  76.5\nLM60UU  60  90  110  85  3.15  86.5\nLM6LUU (long)  6  12  35  27  1.1  11.5\nLM8LUU (long)  8  15  45  35  1.1  14.3\nLM10LUU (long)  10  19  55  44  1.3  18\nLM12LUU (long)  12  21  57  46  1.3  20\nLM13LUU (long)  13  23  61  46  1.3  22\nLM16LUU (long)  16  28  70  53  1.6  27\nLM20LUU (long)  20  32  80  61  1.6  30.5\nLM25LUU (long)  25  40  112  82  1.85  38\nLM30LUU (long)  30  45  123  89  1.85  43\nLM35LUU (long)  35  52  135  99  2.1  49\nLM40LUU (long)  40  60  154  121  2.1  57\nLM50LUU (long)  50  80  192  148  2.6  76.5\nLM60LUU (long)  60  90  211  170  3.15  86.5\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Linear motion catalogue (maker not named; hosted on DriveHQ): Ball bushes: LM..UU and LM..LUU (d, D, L, B, W, D1), LMF (d, D, L, D1, H, PCD, hole), LMK / LMH (K, W, A, F) — web — Publisher's page; dimensions are facts — https://www.drivehq.com/file/df.aspx/isGallarytrue/shareID6477378/parentID26712025/fileID8191578157?1=1\n- WF International: LM..LUU long linear bearing: d, D, L, ring-groove numbers — web — Publisher's page; dimensions are facts — https://www.wfint.com.tw/LM_L-Series/long-linear-bearing.html\n- Misumi catalogue (India site, page 18): LM..LUU long standard bushings: dr, D, L, B, W, D1 (L is 151 / 209 for LM40LUU / LM60LUU there) — web — Publisher's page; dimensions are facts — https://in.c.misumi-ec.com/book/VONA1_MYT_V/pdf/0018.pdf\n- CWL Bearing: LM..UU linear motion bearings: d, D, L for LM3UU to LM60UU — web — Publisher's page; dimensions are facts — https://cwlbearing.com/linear-motion-bearings\n- Misumi: C-LMU linear bushing (Misumi's own B, W, D1 differ from the LM..UU catalogues; used only to show the spread) — web — Publisher's page; dimensions are facts — https://sg.misumi-ec.com/vona2/detail/110302580750/\n- Samick (via AIMS Industrial): Flanged linear bushing LMF, Asian standard catalogue p.70-71: d, D, L, D1, H, PCD, d1 x d2 x h — web — Publisher's page; dimensions are facts — https://aimsindustrial.com.au/cdn/shop/files/Samick-Flanged-Linear-Bushing-LMF-Asian-Standard-Catalogue-Cover-and-Pages-70-71.pdf\n- Samick (via AIMS Industrial): Flanged long linear bushing LMF..L, Asian standard catalogue p.72-73: d, D, L, D1, H, PCD, d1 x d2 x h — web — Publisher's page; dimensions are facts — https://aimsindustrial.com.au/cdn/shop/files/Samick-Flanged-Long-Linear-Bushing-LMF-L-Asian-Standard-Catalogue-Cover-and-Pages-72-73.pdf\n- Tuli (distributor datasheet): LMK..UU square flange linear bearings: d, D, L, flange square K, H, PCD, bolt hole d1 x d2 x h — web — Publisher's page; dimensions are facts — https://www.tuli.si/media/custom/upload/LMK-UU-Linear-Bearings.pdf\n- THK: Linear bushings LM, LME, LMF: housing bore tolerances H7 / J7 / H6 / J6 / K6 and LM shaft tolerances f6 / g6 / h6 / f5 / g5 / h5 / h7 / k6 (B4-39 to B4-41) — web — Publisher's page; dimensions are facts — https://tech.thk.com/en/products/pdf/en_b04_039.pdf\n- McMaster-Carr: Linear ball bearings and linear bearing shafts (rods) (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/linear-rod-bearings\n- McMaster-Carr: Flange-mounted linear ball bearings (round and square flange, inch and metric) (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/flanged-linear-ball-bearings\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=linear-ball-bushings-lm-uu-luu\n",
 "sources": [
  {
   "publisher": "Linear motion catalogue (maker not named; hosted on DriveHQ)",
   "title": "Ball bushes: LM..UU and LM..LUU (d, D, L, B, W, D1), LMF (d, D, L, D1, H, PCD, hole), LMK / LMH (K, W, A, F)",
   "url": "https://www.drivehq.com/file/df.aspx/isGallarytrue/shareID6477378/parentID26712025/fileID8191578157?1=1",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "WF International",
   "title": "LM..LUU long linear bearing: d, D, L, ring-groove numbers",
   "url": "https://www.wfint.com.tw/LM_L-Series/long-linear-bearing.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Misumi catalogue (India site, page 18)",
   "title": "LM..LUU long standard bushings: dr, D, L, B, W, D1 (L is 151 / 209 for LM40LUU / LM60LUU there)",
   "url": "https://in.c.misumi-ec.com/book/VONA1_MYT_V/pdf/0018.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "CWL Bearing",
   "title": "LM..UU linear motion bearings: d, D, L for LM3UU to LM60UU",
   "url": "https://cwlbearing.com/linear-motion-bearings",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Misumi",
   "title": "C-LMU linear bushing (Misumi's own B, W, D1 differ from the LM..UU catalogues; used only to show the spread)",
   "url": "https://sg.misumi-ec.com/vona2/detail/110302580750/",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Samick (via AIMS Industrial)",
   "title": "Flanged linear bushing LMF, Asian standard catalogue p.70-71: d, D, L, D1, H, PCD, d1 x d2 x h",
   "url": "https://aimsindustrial.com.au/cdn/shop/files/Samick-Flanged-Linear-Bushing-LMF-Asian-Standard-Catalogue-Cover-and-Pages-70-71.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Samick (via AIMS Industrial)",
   "title": "Flanged long linear bushing LMF..L, Asian standard catalogue p.72-73: d, D, L, D1, H, PCD, d1 x d2 x h",
   "url": "https://aimsindustrial.com.au/cdn/shop/files/Samick-Flanged-Long-Linear-Bushing-LMF-L-Asian-Standard-Catalogue-Cover-and-Pages-72-73.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Tuli (distributor datasheet)",
   "title": "LMK..UU square flange linear bearings: d, D, L, flange square K, H, PCD, bolt hole d1 x d2 x h",
   "url": "https://www.tuli.si/media/custom/upload/LMK-UU-Linear-Bearings.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "THK",
   "title": "Linear bushings LM, LME, LMF: housing bore tolerances H7 / J7 / H6 / J6 / K6 and LM shaft tolerances f6 / g6 / h6 / f5 / g5 / h5 / h7 / k6 (B4-39 to B4-41)",
   "url": "https://tech.thk.com/en/products/pdf/en_b04_039.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Linear ball bearings and linear bearing shafts (rods) (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/linear-rod-bearings",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Flange-mounted linear ball bearings (round and square flange, inch and metric) (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/flanged-linear-ball-bearings",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "flanged-linear-bushings-lmf-lmk-lmh",
  "lm8uu-bearing",
  "linear-shafts-h6",
  "pillow-block-kp08",
  "mgn-rails",
  "retaining-rings-din-472-internal"
 ],
 "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": [],
 "faq": [
  {
   "q": "What are the dimensions of an LM10UU?",
   "a": "Bore 10, OD 19, length 29; ring grooves 1.3 wide at Ø18."
  },
  {
   "q": "What is the difference between LM8UU and LM8LUU?",
   "a": "Same 8 mm bore and Ø15 OD; the L (long) is 45 mm long instead of 24 and carries a longer ball set."
  },
  {
   "q": "What snap ring groove does an LM8UU have?",
   "a": "Groove 1.1 mm wide, groove diameter 14.3 (OD 15)."
  },
  {
   "q": "How long is an LM12LUU?",
   "a": "57 mm (OD 21, bore 12)."
  }
 ],
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}