{
 "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": "hiwin-eg-linear-guideway-egr-egh-15-30",
 "name": "HIWIN EG low-profile linear guideway: EGR15 to EGR35 rail and EGH15 to EGH30 SA / CA block dimensions (width, height, hole pitch, mounting holes)",
 "kind": "standard",
 "category": "Hardware",
 "group": "Bearings, rails & motion",
 "year": null,
 "question": "What are the dimensions of HIWIN EGR15 to EGR30 rails and EGH15SA / EGH15CA to EGH30SA blocks: rail width and height, hole pitch, counterbore, block mounting holes and length?",
 "tags": [
  "hiwin",
  "linear guide",
  "profile rail",
  "egr15",
  "egh15sa",
  "egh20ca",
  "low profile",
  "rail",
  "block",
  "standard"
 ],
 "aliases": [
  "egr15 dimensions",
  "egr20",
  "egr25 rail",
  "egr30",
  "egh15sa dimensions",
  "egh15ca dimensions",
  "egh20ca dimensions",
  "egh25ca",
  "egh30sa",
  "hiwin eg rail width",
  "hiwin low profile linear guide dimensions",
  "egr15 hole pitch 60",
  "egh15 mounting holes",
  "egr30 80 mm pitch",
  "hiwin eg vs hg"
 ],
 "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/hiwin-eg-linear-guideway-egr-egh-15-30/",
 "sheet_txt": "https://xemstudio.com/objects/hiwin-eg-linear-guideway-egr-egh-15-30/sheet.txt",
 "sheet": {
  "basis": "HIWIN EG Series 2025 catalog tables (one document, two extractions); the cells that merge between SA and CA rows are left out",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "HIWIN EG is the low-profile ball-type guideway: EGR rail, EGH square block in a short (SA) and long (CA) body, EGW flange blocks (not read). Dimension letters as in HIWIN's catalog: W / WR width, H / HR height (H from the rail bottom to the block top), B across and C along the block holes, L1 body length and L overall length, M x l thread and depth, T hole depth, D x h x d rail counterbore, P hole pitch, E end distance.",
   "Source and its limits: all numbers are from HIWIN's EG Series 2025 catalog as hosted by Motion Industries, read in two extractions that agree. It is a single document, and its table layout merges cells between the SA and CA rows, so only what is unambiguous is shown: the SA block rows in full, and for the CA blocks only the body length L1 and overall length L (the printed 'H' of the CA rows, 26 / 32 / 35 / 40 mm, is the C hole spacing, which is why a CA row's H is not shown). The rail data is in two tables: EGR_T (tapped from below, S x thread depth h) for sizes 15 to 35, and EGR_U ('large mounting hole, rail mounting from top') for which only sizes 15 and 30 had D, h, d printed in the text read; the EGH block tables also list the standard rail bolts M3 x 16 (15), M5 x 16 (20), M6 x 20 (25) and M6 x 25 (30), which belong to the standard-counterbore rail EGR_R whose D, h and d were not printed in the text read. (The M3 x 16 and M6 x 25 for EG size 15 and 30 differ from the M4 x 16 and M8 x 25 of the large-hole EGR_U rail.)",
   "End distance: E = 20 mm standard on all rails; for cut rails E should not exceed half the pitch (30 mm for 60 mm pitch, 40 mm for 80 mm; derived from that rule as the catalog states it). Standard-rail E tolerance +/-0.5 mm.",
   "Numbers only, no CAD files: the rail and block cross-sections are not dimensioned in the catalog. For STEP use HIWIN's CAD configurator (linked under sources).",
   "Left out: EGW flange blocks, EGH 35, EGR20 / 25 large-hole rails and the EG standard-counterbore D, h, d (not legible), moments, load ratings and weights, the QE series."
  ],
  "table": {
   "columns": [
    "part",
    "width W / WR, mm",
    "height H / HR, mm",
    "length L (block), mm",
    "block holes B / rail pitch P, mm",
    "thread / bolt",
    "rail counterbore D x h, through d, mm / thread depth h",
    "rail end distance E / other block dimensions"
   ],
   "rows": [
    [
     "EGR15T rail (tapped from below)",
     "15",
     "12.5",
     "rail length: any",
     "P 60",
     "tapped M5 x 0.8",
     "thread depth h 7",
     "E 20 standard"
    ],
    [
     "EGR20T rail (tapped from below)",
     "20",
     "15.5",
     "rail length: any",
     "P 60",
     "tapped M6 x 1",
     "thread depth h 9",
     "E 20 standard"
    ],
    [
     "EGR25T rail (tapped from below)",
     "23",
     "18",
     "rail length: any",
     "P 60",
     "tapped M6 x 1",
     "thread depth h 10",
     "E 20 standard"
    ],
    [
     "EGR30T rail (tapped from below)",
     "28",
     "23",
     "rail length: any",
     "P 80",
     "tapped M8 x 1.25",
     "thread depth h 14",
     "E 20 standard"
    ],
    [
     "EGR35T rail (tapped from below)",
     "34",
     "27.5",
     "rail length: any",
     "P 80",
     "tapped M8 x 1.25",
     "thread depth h 17",
     "E 20 standard"
    ],
    [
     "EGR15U rail (large counterbore, from above)",
     "15",
     "12.5",
     "rail length: any",
     "P 60",
     "rail bolt M4 x 16",
     "D 7.5 x h 5.3, d 4.5",
     "E 20 standard"
    ],
    [
     "EGR30U rail (large counterbore, from above)",
     "28",
     "23",
     "rail length: any",
     "P 80",
     "rail bolt M8 x 25",
     "D 14 x h 12, d 9",
     "E 20 standard"
    ],
    [
     "EGR15R rail (standard counterbore, from above), bolt only",
     "—",
     "—",
     "rail length: any",
     "—",
     "rail bolt M3 x 16",
     "counterbore D, h, d not read",
     "—"
    ],
    [
     "EGR20R rail (standard counterbore, from above), bolt only",
     "—",
     "—",
     "rail length: any",
     "—",
     "rail bolt M5 x 16",
     "counterbore D, h, d not read",
     "—"
    ],
    [
     "EGR25R rail (standard counterbore, from above), bolt only",
     "—",
     "—",
     "rail length: any",
     "—",
     "rail bolt M6 x 20",
     "counterbore D, h, d not read",
     "—"
    ],
    [
     "EGR30R rail (standard counterbore, from above), bolt only",
     "—",
     "—",
     "rail length: any",
     "—",
     "rail bolt M6 x 25",
     "counterbore D, h, d not read",
     "—"
    ],
    [
     "EGH15SA block (short, square)",
     "34",
     "24",
     "40.1",
     "B 26",
     "M4 x 6 (blind, depth l)",
     "T 6",
     "H1 4.5, N 9.5, B1 4, L1 23.1, K1 14.8, K2 3.5, G 5.7, H2 5.5, H3 6"
    ],
    [
     "EGH20SA block (short, square)",
     "42",
     "28",
     "50",
     "B 32",
     "M5 x 7 (blind, depth l)",
     "T 7.5",
     "H1 6, N 11, B1 5, L1 29, K1 18.75, K2 4.15, G 12, H2 6, H3 6"
    ],
    [
     "EGH25SA block (short, square)",
     "48",
     "33",
     "59.1",
     "B 35",
     "M6 x 9 (blind, depth l)",
     "T 8",
     "H1 7, N 12.5, B1 6.5, L1 35.5, K1 21.9, K2 4.55, G 12, H2 8, H3 8"
    ],
    [
     "EGH30SA block (short, square)",
     "60",
     "42",
     "69.5",
     "B 40",
     "M8 x 12 (blind, depth l)",
     "T 9",
     "H1 10, N 16, B1 10, L1 41.5, K1 26.75, K2 6, G 12, H2 8, H3 9"
    ],
    [
     "EGH15CA block (long, square)",
     "as the SA block (not printed separately)",
     "as SA (the printed CA cell is the C spacing, not H)",
     "56.8",
     "B as SA",
     "as SA",
     "—",
     "L1 39.8 (body length)"
    ],
    [
     "EGH20CA block (long, square)",
     "as the SA block (not printed separately)",
     "as SA (the printed CA cell is the C spacing, not H)",
     "69.1",
     "B as SA",
     "as SA",
     "—",
     "L1 48.1 (body length)"
    ],
    [
     "EGH25CA block (long, square)",
     "as the SA block (not printed separately)",
     "as SA (the printed CA cell is the C spacing, not H)",
     "82.6",
     "B as SA",
     "as SA",
     "—",
     "L1 59 (body length)"
    ],
    [
     "EGH30CA block (long, square)",
     "as the SA block (not printed separately)",
     "as SA (the printed CA cell is the C spacing, not H)",
     "98.1",
     "B as SA",
     "as SA",
     "—",
     "L1 70.1 (body length)"
    ]
   ]
  }
 },
 "sheet_text": "HIWIN EG low-profile linear guideway: EGR15 to EGR35 rail and EGH15 to EGH30 SA / CA block dimensions (width, height, hole pitch, mounting holes) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/hiwin-eg-linear-guideway-egr-egh-15-30/  (sheet CC BY 4.0)\nBasis: HIWIN EG Series 2025 catalog tables (one document, two extractions); the cells that merge between SA and CA rows are left out\nCatalog version: 2026-10-20\n\nSizes: see table below\n- HIWIN EG is the low-profile ball-type guideway: EGR rail, EGH square block in a short (SA) and long (CA) body, EGW flange blocks (not read). Dimension letters as in HIWIN's catalog: W / WR width, H / HR height (H from the rail bottom to the block top), B across and C along the block holes, L1 body length and L overall length, M x l thread and depth, T hole depth, D x h x d rail counterbore, P hole pitch, E end distance.\n- Source and its limits: all numbers are from HIWIN's EG Series 2025 catalog as hosted by Motion Industries, read in two extractions that agree. It is a single document, and its table layout merges cells between the SA and CA rows, so only what is unambiguous is shown: the SA block rows in full, and for the CA blocks only the body length L1 and overall length L (the printed 'H' of the CA rows, 26 / 32 / 35 / 40 mm, is the C hole spacing, which is why a CA row's H is not shown). The rail data is in two tables: EGR_T (tapped from below, S x thread depth h) for sizes 15 to 35, and EGR_U ('large mounting hole, rail mounting from top') for which only sizes 15 and 30 had D, h, d printed in the text read; the EGH block tables also list the standard rail bolts M3 x 16 (15), M5 x 16 (20), M6 x 20 (25) and M6 x 25 (30), which belong to the standard-counterbore rail EGR_R whose D, h and d were not printed in the text read. (The M3 x 16 and M6 x 25 for EG size 15 and 30 differ from the M4 x 16 and M8 x 25 of the large-hole EGR_U rail.)\n- End distance: E = 20 mm standard on all rails; for cut rails E should not exceed half the pitch (30 mm for 60 mm pitch, 40 mm for 80 mm; derived from that rule as the catalog states it). Standard-rail E tolerance +/-0.5 mm.\n- Numbers only, no CAD files: the rail and block cross-sections are not dimensioned in the catalog. For STEP use HIWIN's CAD configurator (linked under sources).\n- Left out: EGW flange blocks, EGH 35, EGR20 / 25 large-hole rails and the EG standard-counterbore D, h, d (not legible), moments, load ratings and weights, the QE series.\n\npart  width W / WR, mm  height H / HR, mm  length L (block), mm  block holes B / rail pitch P, mm  thread / bolt  rail counterbore D x h, through d, mm / thread depth h  rail end distance E / other block dimensions\nEGR15T rail (tapped from below)  15  12.5  rail length: any  P 60  tapped M5 x 0.8  thread depth h 7  E 20 standard\nEGR20T rail (tapped from below)  20  15.5  rail length: any  P 60  tapped M6 x 1  thread depth h 9  E 20 standard\nEGR25T rail (tapped from below)  23  18  rail length: any  P 60  tapped M6 x 1  thread depth h 10  E 20 standard\nEGR30T rail (tapped from below)  28  23  rail length: any  P 80  tapped M8 x 1.25  thread depth h 14  E 20 standard\nEGR35T rail (tapped from below)  34  27.5  rail length: any  P 80  tapped M8 x 1.25  thread depth h 17  E 20 standard\nEGR15U rail (large counterbore, from above)  15  12.5  rail length: any  P 60  rail bolt M4 x 16  D 7.5 x h 5.3, d 4.5  E 20 standard\nEGR30U rail (large counterbore, from above)  28  23  rail length: any  P 80  rail bolt M8 x 25  D 14 x h 12, d 9  E 20 standard\nEGR15R rail (standard counterbore, from above), bolt only  —  —  rail length: any  —  rail bolt M3 x 16  counterbore D, h, d not read  —\nEGR20R rail (standard counterbore, from above), bolt only  —  —  rail length: any  —  rail bolt M5 x 16  counterbore D, h, d not read  —\nEGR25R rail (standard counterbore, from above), bolt only  —  —  rail length: any  —  rail bolt M6 x 20  counterbore D, h, d not read  —\nEGR30R rail (standard counterbore, from above), bolt only  —  —  rail length: any  —  rail bolt M6 x 25  counterbore D, h, d not read  —\nEGH15SA block (short, square)  34  24  40.1  B 26  M4 x 6 (blind, depth l)  T 6  H1 4.5, N 9.5, B1 4, L1 23.1, K1 14.8, K2 3.5, G 5.7, H2 5.5, H3 6\nEGH20SA block (short, square)  42  28  50  B 32  M5 x 7 (blind, depth l)  T 7.5  H1 6, N 11, B1 5, L1 29, K1 18.75, K2 4.15, G 12, H2 6, H3 6\nEGH25SA block (short, square)  48  33  59.1  B 35  M6 x 9 (blind, depth l)  T 8  H1 7, N 12.5, B1 6.5, L1 35.5, K1 21.9, K2 4.55, G 12, H2 8, H3 8\nEGH30SA block (short, square)  60  42  69.5  B 40  M8 x 12 (blind, depth l)  T 9  H1 10, N 16, B1 10, L1 41.5, K1 26.75, K2 6, G 12, H2 8, H3 9\nEGH15CA block (long, square)  as the SA block (not printed separately)  as SA (the printed CA cell is the C spacing, not H)  56.8  B as SA  as SA  —  L1 39.8 (body length)\nEGH20CA block (long, square)  as the SA block (not printed separately)  as SA (the printed CA cell is the C spacing, not H)  69.1  B as SA  as SA  —  L1 48.1 (body length)\nEGH25CA block (long, square)  as the SA block (not printed separately)  as SA (the printed CA cell is the C spacing, not H)  82.6  B as SA  as SA  —  L1 59 (body length)\nEGH30CA block (long, square)  as the SA block (not printed separately)  as SA (the printed CA cell is the C spacing, not H)  98.1  B as SA  as SA  —  L1 70.1 (body length)\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- HIWIN (EG Series 2025, hosted by Motion Industries): EG series low-profile guideway: EGH SA / CA block table and EGR rail tables — web — Publisher's page; dimensions are facts — https://s3.amazonaws.com/www.motionusa.com/hiwin/2025/EG Series_2025.pdf\n- HIWIN: EG series rail CAD (HIWIN's own CAD configurator, STEP download; check HIWIN's terms) — STEP, web — HIWIN site terms [verify license at link] — https://motioncontrolsystems.hiwin.com/en-us/configurator/eg-series-rail\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=hiwin-eg-linear-guideway-egr-egh-15-30\n",
 "sources": [
  {
   "publisher": "HIWIN (EG Series 2025, hosted by Motion Industries)",
   "title": "EG series low-profile guideway: EGH SA / CA block table and EGR rail tables",
   "url": "https://s3.amazonaws.com/www.motionusa.com/hiwin/2025/EG Series_2025.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "HIWIN",
   "title": "EG series rail CAD (HIWIN's own CAD configurator, STEP download; check HIWIN's terms)",
   "url": "https://motioncontrolsystems.hiwin.com/en-us/configurator/eg-series-rail",
   "formats": [
    "STEP",
    "web"
   ],
   "license": "HIWIN site terms",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "hiwin-hg-linear-guideway-hgr-hgh-hgw-15-35",
  "mgn-rails",
  "ball-screw-end-supports-bk-bf-fk-ff",
  "linear-shafts-h6",
  "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": "rail width x height",
   "exact": "EGR15 15 x 12.5, EGR20 20 x 15.5, EGR25 23 x 18, EGR30 28 x 23, EGR35 34 x 27.5 mm",
   "mates": "EGH block of the same size runs on this rail",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "rail hole pitch and end distance",
   "exact": "P 60 mm (15, 20, 25) or 80 mm (30, 35); E 20 mm standard",
   "mates": "mounting surface drilled and tapped on the same pitch",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "EGR15U / EGR30U counterbore and hole",
   "exact": "D 7.5 x 5.3, d Ø4.5 (size 15); D 14 x 12, d Ø9 (size 30)",
   "mates": "socket head cap screw M4 x 16 (size 15) / M8 x 25 (size 30), head in the counterbore; screws on socket-head-cap-screws-metric",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "EGH SA block holes",
   "exact": "B 26 / 32 / 35 / 40 mm, M4 x 6 / M5 x 7 / M6 x 9 / M8 x 12 (EGH15 / 20 / 25 / 30)",
   "mates": "carriage plate drilled on the same B with clearance for the M screws",
   "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 rail width and hole pitch of EGR15?",
   "a": "15 mm wide, 12.5 mm high, hole pitch 60 mm, end distance 20 mm; tapped M5 x 0.8 from below, or counterbored D 7.5 x 5.3 / d 4.5 for M4 from above (large-hole version)."
  },
  {
   "q": "How tall is an EGH15SA block?",
   "a": "24 mm from the rail bottom to the block top (H), 34 mm wide, 40.1 mm long, four M4 x 6 holes on B = 26."
  },
  {
   "q": "What is the difference between EGH and HGH?",
   "a": "EG is the low-profile family: EGH15SA is 24 mm high against 28 mm for HGH15CA on a 12.5 mm rail against 15 mm."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/hiwin-eg-linear-guideway-egr-egh-15-30/index.md"
}