{
 "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": "rigid-shaft-couplings-ruland-mclc-mscx",
 "name": "Rigid shaft couplings (Ruland MCLC, MSCX, MSCC clamp and set-screw style): bore, OD and length, 6 to 50 mm bore",
 "kind": "standard",
 "category": "Hardware",
 "group": "Bearings, rails & motion",
 "year": null,
 "question": "What are the OD and length of a rigid clamp or set-screw shaft coupling for a given bore, such as 8, 10, 12, 16, 20 or 25 mm?",
 "tags": [
  "coupling",
  "rigid coupling",
  "shaft coupling",
  "clamp coupling",
  "set screw coupling",
  "ruland",
  "mclc",
  "mscx",
  "one-piece"
 ],
 "aliases": [
  "rigid coupling dimensions",
  "rigid shaft coupling 8mm",
  "rigid coupling 10mm",
  "rigid coupling 12mm",
  "rigid coupling 16mm",
  "rigid coupling 20mm",
  "rigid coupling 25mm",
  "ruland mclc",
  "ruland mscx",
  "ruland mclx",
  "mclc-10-10",
  "mscx-8-8",
  "one piece clamp coupling",
  "set screw shaft coupler od length",
  "rigid coupling od 29mm",
  "shaft coupler 6mm to 8mm"
 ],
 "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/rigid-shaft-couplings-ruland-mclc-mscx/",
 "sheet_txt": "https://xemstudio.com/objects/rigid-shaft-couplings-ruland-mclc-mscx/sheet.txt",
 "sheet": {
  "basis": "Ruland metric dimension tables (MCLC, MSCX, MSCC) and Ruland / RS datasheets for MCLX-3-3-A, MSCX-6-6-F, MCLX-25-20-F; maker CAD not linked",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A rigid shaft coupling joins two shafts of the same or similar size with no flex, so the shafts must already be aligned. The one-piece clamp style (Ruland MCLC / MCLX, 'clamp-style') closes a slit on the shaft with clamp screws; the set-screw style (MSCX / MSCC) locks with set screws, often on the keyway flat. Sizes are named by bore: MCLC-12-12 is a 12 mm bore on both ends.",
   "Table: the OD and length in Ruland's metric tables are identical across MCLC (clamp, keyway), MSCX (set screw) and MSCC (set screw, keyway) for every bore they share (8, 10, 12, 14, 16, 20, 25, 30, 35, 40, 50 mm; MSCX also 6 mm; MCLC also 15 mm). The 15 mm bore is from the MCLC table only. Black-oxide steel (F) and 303 stainless steel (SS) versions have the same OD and length. Rated speed is 4,000 rpm in the MCLC table.",
   "Screws: MSCX-6 uses 4 set screws M4 (2 mm hex wrench), shaft penetration 15 mm per side, seating torque 2.2 Nm. MCLX-3-3-A uses 4 forged clamp screws M2 (1.5 mm wrench), shaft penetration 11 mm, seating torque 0.6 Nm. MCLX-25-20-F uses 4 clamp screws M6 (5 mm wrench). The other sizes' screw sizes were not read, so none are invented here.",
   "Bore tolerance (Ruland datasheet, MCLX-3-3-A): +0.050 / +0.012 mm; recommended shaft: +0.000 / −0.013 mm. Other sizes' tolerances were not read.",
   "No STEP/STL: the screw positions, clamp slit and keyway shapes are not published as numbers in the sources read, so no honest model beyond a plain tube exists. Left out: two-piece clamp couplings, inch bores (the MCLX inch series and the 'inch to metric' pages exist but were not read), torque ratings, moment of inertia."
  ],
  "table": {
   "columns": [
    "bore, mm (B1 = B2)",
    "OD, mm",
    "length L, mm",
    "OD / bore",
    "Ruland series with this size"
   ],
   "rows": [
    [
     "6",
     "18",
     "30",
     "3.00",
     "MSCX (set screw)"
    ],
    [
     "8",
     "24",
     "35",
     "3.00",
     "MCLC (clamp, keyway); MSCX (set screw)"
    ],
    [
     "10",
     "29",
     "45",
     "2.90",
     "MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway)"
    ],
    [
     "12",
     "29",
     "45",
     "2.42",
     "MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway)"
    ],
    [
     "14",
     "34",
     "50",
     "2.43",
     "MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway)"
    ],
    [
     "15",
     "34",
     "50",
     "2.27",
     "MCLC (clamp, keyway)"
    ],
    [
     "16",
     "34",
     "50",
     "2.12",
     "MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway)"
    ],
    [
     "20",
     "42",
     "65",
     "2.10",
     "MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway)"
    ],
    [
     "25",
     "45",
     "75",
     "1.80",
     "MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway)"
    ],
    [
     "30",
     "53",
     "83",
     "1.77",
     "MCLC (clamp, keyway); MSCX (set screw)"
    ],
    [
     "35",
     "67",
     "95",
     "1.91",
     "MCLC (clamp, keyway); MSCX (set screw)"
    ],
    [
     "40",
     "77",
     "108",
     "1.93",
     "MCLC (clamp, keyway); MSCX (set screw)"
    ],
    [
     "50",
     "85",
     "124",
     "1.70",
     "MCLC (clamp, keyway); MSCX (set screw)"
    ],
    [
     "3 (MCLX-3-3-A, aluminum)",
     "15",
     "22",
     "5.00",
     "MCLX one-piece clamp; clamp screw M2 (1.5 mm key), 4 screws; max shaft penetration 11 mm"
    ],
    [
     "6 and 8 (MCLX-8-6-F)",
     "24",
     "35",
     "—",
     "MCLX with two bores (8 mm and 6 mm), steel"
    ],
    [
     "10 and 8 (MCLX-10-8-F)",
     "29",
     "45",
     "—",
     "MCLX with two bores (10 and 8 mm)"
    ],
    [
     "20 and 16 (MCLX-20-16-F)",
     "42",
     "65",
     "—",
     "MCLX with two bores (20 and 16 mm)"
    ],
    [
     "25 and 20 (MCLX-25-20-F)",
     "45",
     "75",
     "—",
     "MCLX with two bores (25 and 20 mm); clamp screw M6 (5 mm key), 4 screws"
    ]
   ]
  }
 },
 "sheet_text": "Rigid shaft couplings (Ruland MCLC, MSCX, MSCC clamp and set-screw style): bore, OD and length, 6 to 50 mm bore — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/rigid-shaft-couplings-ruland-mclc-mscx/  (sheet CC BY 4.0)\nBasis: Ruland metric dimension tables (MCLC, MSCX, MSCC) and Ruland / RS datasheets for MCLX-3-3-A, MSCX-6-6-F, MCLX-25-20-F; maker CAD not linked\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A rigid shaft coupling joins two shafts of the same or similar size with no flex, so the shafts must already be aligned. The one-piece clamp style (Ruland MCLC / MCLX, 'clamp-style') closes a slit on the shaft with clamp screws; the set-screw style (MSCX / MSCC) locks with set screws, often on the keyway flat. Sizes are named by bore: MCLC-12-12 is a 12 mm bore on both ends.\n- Table: the OD and length in Ruland's metric tables are identical across MCLC (clamp, keyway), MSCX (set screw) and MSCC (set screw, keyway) for every bore they share (8, 10, 12, 14, 16, 20, 25, 30, 35, 40, 50 mm; MSCX also 6 mm; MCLC also 15 mm). The 15 mm bore is from the MCLC table only. Black-oxide steel (F) and 303 stainless steel (SS) versions have the same OD and length. Rated speed is 4,000 rpm in the MCLC table.\n- Screws: MSCX-6 uses 4 set screws M4 (2 mm hex wrench), shaft penetration 15 mm per side, seating torque 2.2 Nm. MCLX-3-3-A uses 4 forged clamp screws M2 (1.5 mm wrench), shaft penetration 11 mm, seating torque 0.6 Nm. MCLX-25-20-F uses 4 clamp screws M6 (5 mm wrench). The other sizes' screw sizes were not read, so none are invented here.\n- Bore tolerance (Ruland datasheet, MCLX-3-3-A): +0.050 / +0.012 mm; recommended shaft: +0.000 / −0.013 mm. Other sizes' tolerances were not read.\n- No STEP/STL: the screw positions, clamp slit and keyway shapes are not published as numbers in the sources read, so no honest model beyond a plain tube exists. Left out: two-piece clamp couplings, inch bores (the MCLX inch series and the 'inch to metric' pages exist but were not read), torque ratings, moment of inertia.\n\nbore, mm (B1 = B2)  OD, mm  length L, mm  OD / bore  Ruland series with this size\n6  18  30  3.00  MSCX (set screw)\n8  24  35  3.00  MCLC (clamp, keyway); MSCX (set screw)\n10  29  45  2.90  MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway)\n12  29  45  2.42  MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway)\n14  34  50  2.43  MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway)\n15  34  50  2.27  MCLC (clamp, keyway)\n16  34  50  2.12  MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway)\n20  42  65  2.10  MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway)\n25  45  75  1.80  MCLC (clamp, keyway); MSCX (set screw); MSCC (set screw, keyway)\n30  53  83  1.77  MCLC (clamp, keyway); MSCX (set screw)\n35  67  95  1.91  MCLC (clamp, keyway); MSCX (set screw)\n40  77  108  1.93  MCLC (clamp, keyway); MSCX (set screw)\n50  85  124  1.70  MCLC (clamp, keyway); MSCX (set screw)\n3 (MCLX-3-3-A, aluminum)  15  22  5.00  MCLX one-piece clamp; clamp screw M2 (1.5 mm key), 4 screws; max shaft penetration 11 mm\n6 and 8 (MCLX-8-6-F)  24  35  —  MCLX with two bores (8 mm and 6 mm), steel\n10 and 8 (MCLX-10-8-F)  29  45  —  MCLX with two bores (10 and 8 mm)\n20 and 16 (MCLX-20-16-F)  42  65  —  MCLX with two bores (20 and 16 mm)\n25 and 20 (MCLX-25-20-F)  45  75  —  MCLX with two bores (25 and 20 mm); clamp screw M6 (5 mm key), 4 screws\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Ruland: One-piece rigid clamp couplings MCLC, metric dimensions: bore B1, B2, length L, OD, 4,000 rpm — web — Publisher's page; dimensions are facts — https://www.ruland.com/rigid-couplings/one-piece-rigid-coupling/dimensions-metric.html\n- Ruland: Set screw rigid couplings MSCX (keyway no), metric: bore, length, OD — web — Publisher's page; dimensions are facts — https://www.ruland.com/rigid-couplings/set-screw-rigid-coupling/keyway-no.html\n- Ruland: Set screw rigid couplings with keyway MSCC, metric: bore, OD, length — web — Publisher's page; dimensions are facts — https://www.ruland.com/rigid-couplings/set-screw-rigid-coupling/mscc-with-keyway-metric.html\n- Ruland: MSCX-6-6-F: set screw M4, hex wrench 2 mm, 4 screws, shaft penetration 15 mm, seating torque 2.2 Nm — web — Publisher's page; dimensions are facts — https://www.ruland.com/mscx-6-6-f.html\n- RS Components (Ruland datasheet): MCLX-3-3-A: bore 3, OD 15, L 22, clamp screw M2, wrench 1.5, 4 screws, bore tolerance +0.050 / +0.012, shaft +0 / -0.013 — web — Publisher's page; dimensions are facts — https://docs.rs-online.com/c4f4/A700000013939857.pdf\n- RS Components (Ruland datasheet): MCLX-25-20-F: bores 25 and 20, OD 45, L 75, clamp screw M6, wrench 5 mm, 4 screws — web — Publisher's page; dimensions are facts — https://docs.rs-online.com/f866/A700000014000251.pdf\n- Zoro (Ruland listings): MCLX-8-6-F (OD 24, L 35), MCLX-10-8-F (OD 29, L 45), MCLX-20-16-F (OD 42, L 65) as printed in the listing titles — web — Publisher's page; dimensions are facts — https://zoro.com/ruland-rigid-coupling-1-pc-8x6mm-steel-od-24-mm-l-35-mm-mclx-8-6-f/i/G7099552\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=rigid-shaft-couplings-ruland-mclc-mscx\n",
 "sources": [
  {
   "publisher": "Ruland",
   "title": "One-piece rigid clamp couplings MCLC, metric dimensions: bore B1, B2, length L, OD, 4,000 rpm",
   "url": "https://www.ruland.com/rigid-couplings/one-piece-rigid-coupling/dimensions-metric.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Ruland",
   "title": "Set screw rigid couplings MSCX (keyway no), metric: bore, length, OD",
   "url": "https://www.ruland.com/rigid-couplings/set-screw-rigid-coupling/keyway-no.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Ruland",
   "title": "Set screw rigid couplings with keyway MSCC, metric: bore, OD, length",
   "url": "https://www.ruland.com/rigid-couplings/set-screw-rigid-coupling/mscc-with-keyway-metric.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Ruland",
   "title": "MSCX-6-6-F: set screw M4, hex wrench 2 mm, 4 screws, shaft penetration 15 mm, seating torque 2.2 Nm",
   "url": "https://www.ruland.com/mscx-6-6-f.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "RS Components (Ruland datasheet)",
   "title": "MCLX-3-3-A: bore 3, OD 15, L 22, clamp screw M2, wrench 1.5, 4 screws, bore tolerance +0.050 / +0.012, shaft +0 / -0.013",
   "url": "https://docs.rs-online.com/c4f4/A700000013939857.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "RS Components (Ruland datasheet)",
   "title": "MCLX-25-20-F: bores 25 and 20, OD 45, L 75, clamp screw M6, wrench 5 mm, 4 screws",
   "url": "https://docs.rs-online.com/f866/A700000014000251.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Zoro (Ruland listings)",
   "title": "MCLX-8-6-F (OD 24, L 35), MCLX-10-8-F (OD 29, L 45), MCLX-20-16-F (OD 42, L 65) as printed in the listing titles",
   "url": "https://zoro.com/ruland-rigid-coupling-1-pc-8x6mm-steel-od-24-mm-l-35-mm-mclx-8-6-f/i/G7099552",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "shaft-couplers",
  "jaw-spider-couplings-l-series",
  "bellows-couplings",
  "oldham-coupling",
  "metric-shafts"
 ],
 "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 B1 / B2",
   "exact": "Ø6 to Ø50 (same bore both ends) and two-bore MCLX",
   "mates": "shaft of the same nominal diameter; Ruland's MCLX-3-3-A bore tolerance +0.050 / +0.012, recommended shaft +0 / −0.013",
   "fit": "clamp",
   "files": "all"
  },
  {
   "feature": "keyway",
   "exact": "on MCLC and MSCC",
   "mates": "parallel key on the shaft (keyway width and depth not read; see the key pages)",
   "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 size is a 10 mm rigid shaft coupling?",
   "a": "Ruland MCLC / MSCX-10-10: OD 29 mm, length 45 mm (the 12 mm bore has the same OD and length)."
  },
  {
   "q": "What size is a 16 mm rigid coupling?",
   "a": "OD 34 mm, length 50 mm (the 14 and 15 mm bores share them)."
  },
  {
   "q": "What clamp screw does a Ruland MCLX-25-20 use?",
   "a": "Four M6 forged clamp screws with a 5 mm hex wrench; OD 45, length 75."
  },
  {
   "q": "What shaft tolerance is recommended?",
   "a": "Ruland's MCLX-3-3-A sheet gives a bore tolerance of +0.050 / +0.012 mm and a recommended shaft of +0.000 / −0.013 mm."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/rigid-shaft-couplings-ruland-mclc-mscx/index.md"
}