{
 "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": "adjustable-clamping-levers-gn-300",
 "name": "Adjustable clamping levers GN 300 (ratchet / tension levers): lever length 30 to 108 mm, thread M3 to M16 and inch, stud length, hub dimensions",
 "kind": "standard",
 "category": "Hardware",
 "group": "Knobs, handles & feet",
 "year": null,
 "question": "What are the dimensions of a GN 300 adjustable clamping lever: lever length, thread, stud length and the hub and boss dimensions?",
 "tags": [
  "clamping lever",
  "adjustable lever",
  "ratchet lever",
  "gn 300",
  "tension lever",
  "indexing handle",
  "threaded stud",
  "hand lever",
  "module"
 ],
 "aliases": [
  "gn 300",
  "gn 300 clamping lever",
  "adjustable clamping lever m8",
  "adjustable hand lever m10",
  "ratchet clamping lever m6",
  "clamping lever 63 mm m8",
  "tension lever m12 108",
  "gn 300 l1 63 l2 50",
  "adjustable lever 1/4-20",
  "adjustable lever 3/8-16",
  "clamping lever thread size",
  "clamping lever stud length",
  "ratcheting handle zinc die-cast",
  "indexing handle m8"
 ],
 "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/adjustable-clamping-levers-gn-300/",
 "sheet_txt": "https://xemstudio.com/objects/adjustable-clamping-levers-gn-300/sheet.txt",
 "sheet": {
  "basis": "JW Winco's GN 300 table (inch and metric), cross-checked against EWM, Galaxus and Monroe listings",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "GN 300 adjustable clamping levers (ratchet levers, 'indexing' hand levers, tension levers): a zinc die-cast lever on a steel serrated insert with a threaded stud. Pull the lever up, swivel it to a clear position and release; the serrations re-engage. The table is JW Winco's GN 300 (threaded stud, steel components, black oxide), inch and metric threads, six lever sizes. Each row is one lever size and thread; stud lengths l2 are the stock lengths in mm (the part number carries them: 3T45A19K is 1/4-20 × 45 mm). Special threads and lengths on request.",
   "d3, d4, h1 to h4 are printed by JW Winco without definitions; they are the same for every thread of a lever size. The only difference between the inch-thread and metric-thread tables is d4 for the 30 mm lever: 12.5 on the inch-thread rows and 12 on the metric-thread rows (both as printed; .49 in = 12.5 mm). Cross-check: the GN 300 listings at EWM (M12 l1 108 × l2 63; M12 l1 92 × l2 40; M10 l1 78 × l2 32), Galaxus (M8 63 × 50; M16 108 × 32 under GN 300.1) match rows of this table.",
   "Related versions (not tabled): GN 300.1 (stainless components), GN 300.4 (increased clamping force; Monroe's sheet lists four sizes l1 63 / 78 / 92 / 108 for M6 / M8 / M10 / M12 with its own letter set R, D, H, H1, h1, h2, d2, h that is not comparable), GN 300.5 (all stainless, l1 45 and 63 in the JW Winco sheet), GN 302 (straight lever) and GN 303.2 (push button, own page).",
   "Numbers only: the lever's curved outline is not published as coordinates, so no file is made. Mounting: a tapped hole of the stud thread, or a through hole and the lever's own insert."
  ],
  "table": {
   "columns": [
    "lever length l1, mm",
    "thread d1",
    "stud lengths l2, mm",
    "d3, mm",
    "d4, mm",
    "h1, mm",
    "h2, mm",
    "h3, mm",
    "h4, mm"
   ],
   "rows": [
    [
     "30",
     "10-32",
     "10, 12, 16, 20, 25, 32",
     "10",
     "12.5",
     "26.5",
     "4",
     "35",
     "3.5"
    ],
    [
     "30",
     "10-24",
     "12, 16, 20, 25, 32",
     "10",
     "12.5",
     "26.5",
     "4",
     "35",
     "3.5"
    ],
    [
     "30",
     "1/4-20",
     "10, 12, 16, 20, 25, 32, 40, 45",
     "10",
     "12.5",
     "26.5",
     "4",
     "35",
     "3.5"
    ],
    [
     "30",
     "M3",
     "10, 12, 16, 20, 25, 32",
     "10",
     "12",
     "26.5",
     "4",
     "35",
     "3.5"
    ],
    [
     "30",
     "M4",
     "10, 12, 16, 20, 25, 32",
     "10",
     "12",
     "26.5",
     "4",
     "35",
     "3.5"
    ],
    [
     "30",
     "M5",
     "12, 16, 20, 25, 32, 40, 50",
     "10",
     "12",
     "26.5",
     "4",
     "35",
     "3.5"
    ],
    [
     "30",
     "M6",
     "10, 12, 16, 20, 25, 32, 40, 45, 50",
     "10",
     "12",
     "26.5",
     "4",
     "35",
     "3.5"
    ],
    [
     "45",
     "10-32",
     "10, 12, 16, 20, 25, 32",
     "10",
     "13",
     "24.5",
     "4",
     "35",
     "3.5"
    ],
    [
     "45",
     "10-24",
     "12, 16, 20, 25, 32",
     "10",
     "13",
     "24.5",
     "4",
     "35",
     "3.5"
    ],
    [
     "45",
     "1/4-20",
     "10, 12, 16, 20, 25, 32, 40, 45",
     "10",
     "13",
     "24.5",
     "4",
     "35",
     "3.5"
    ],
    [
     "45",
     "M4",
     "10, 12, 16, 20, 25, 32",
     "10",
     "13",
     "24.5",
     "4",
     "35",
     "3.5"
    ],
    [
     "45",
     "M5",
     "12, 16, 20, 25, 32, 40, 50",
     "10",
     "13",
     "24.5",
     "4",
     "35",
     "3.5"
    ],
    [
     "45",
     "M6",
     "10, 12, 16, 20, 25, 32, 40, 45, 50",
     "10",
     "13",
     "24.5",
     "4",
     "35",
     "3.5"
    ],
    [
     "63",
     "1/4-20",
     "12, 16, 20, 25",
     "13.5",
     "17.5",
     "31",
     "6.5",
     "45",
     "4"
    ],
    [
     "63",
     "5/16-18",
     "12, 16, 20, 25, 32, 40, 45, 50, 63",
     "13.5",
     "17.5",
     "31",
     "6.5",
     "45",
     "4"
    ],
    [
     "63",
     "3/8-16",
     "16, 20, 25, 32, 40, 45, 50, 63",
     "13.5",
     "17.5",
     "31",
     "6.5",
     "45",
     "4"
    ],
    [
     "63",
     "M6",
     "12, 16, 20, 25, 32, 40, 50, 63",
     "13.5",
     "17.5",
     "31",
     "6.5",
     "45",
     "4"
    ],
    [
     "63",
     "M8",
     "12, 16, 20, 25, 32, 40, 45, 50, 63",
     "13.5",
     "17.5",
     "31",
     "6.5",
     "45",
     "4"
    ],
    [
     "63",
     "M10",
     "16, 20, 25, 32, 40, 45, 50, 63, 80",
     "13.5",
     "17.5",
     "31",
     "6.5",
     "45",
     "4"
    ],
    [
     "78",
     "3/8-16",
     "16, 20, 25, 32, 40, 45, 50, 63",
     "16",
     "21",
     "36",
     "8",
     "55",
     "4"
    ],
    [
     "78",
     "1/2-13",
     "16, 20, 25, 32, 40, 45, 50",
     "16",
     "21",
     "36",
     "8",
     "55",
     "4"
    ],
    [
     "78",
     "M8",
     "16, 20, 25, 32, 40, 45, 50, 63, 80",
     "16",
     "21",
     "36",
     "8",
     "55",
     "4"
    ],
    [
     "78",
     "M10",
     "16, 20, 25, 32, 40, 45, 50, 63, 80",
     "16",
     "21",
     "36",
     "8",
     "55",
     "4"
    ],
    [
     "78",
     "M12",
     "25, 32, 40, 50, 63, 80",
     "16",
     "21",
     "36",
     "8",
     "55",
     "4"
    ],
    [
     "92",
     "3/8-16",
     "16, 20, 25, 32, 40, 45, 50, 63",
     "19",
     "24",
     "43",
     "11",
     "65",
     "4"
    ],
    [
     "92",
     "1/2-13",
     "16, 20, 25, 32, 35, 40, 45, 50, 63",
     "19",
     "24",
     "43",
     "11",
     "65",
     "4"
    ],
    [
     "92",
     "M10",
     "16, 20, 25, 32, 40, 45, 50, 63, 80",
     "19",
     "24",
     "43",
     "11",
     "65",
     "4"
    ],
    [
     "92",
     "M12",
     "16, 20, 25, 32, 35, 40, 45, 50, 63, 80",
     "19",
     "24",
     "43",
     "11",
     "65",
     "4"
    ],
    [
     "92",
     "M16",
     "25, 32, 40, 50, 63, 80",
     "19",
     "24",
     "43",
     "11",
     "65",
     "4"
    ],
    [
     "108",
     "1/2-13",
     "25, 32, 40, 50, 55, 63",
     "23",
     "30",
     "50.5",
     "12",
     "76",
     "5"
    ],
    [
     "108",
     "5/8-11",
     "32, 40, 50, 55, 63",
     "23",
     "30",
     "50.5",
     "12",
     "76",
     "5"
    ],
    [
     "108",
     "M12",
     "25, 32, 40, 50, 63, 80, 120",
     "23",
     "30",
     "50.5",
     "12",
     "76",
     "5"
    ],
    [
     "108",
     "M16",
     "25, 32, 40, 50, 63, 80, 120",
     "23",
     "30",
     "50.5",
     "12",
     "76",
     "5"
    ]
   ]
  }
 },
 "sheet_text": "Adjustable clamping levers GN 300 (ratchet / tension levers): lever length 30 to 108 mm, thread M3 to M16 and inch, stud length, hub dimensions — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/adjustable-clamping-levers-gn-300/  (sheet CC BY 4.0)\nBasis: JW Winco's GN 300 table (inch and metric), cross-checked against EWM, Galaxus and Monroe listings\nCatalog version: 2026-10-20\n\nSizes: see table below\n- GN 300 adjustable clamping levers (ratchet levers, 'indexing' hand levers, tension levers): a zinc die-cast lever on a steel serrated insert with a threaded stud. Pull the lever up, swivel it to a clear position and release; the serrations re-engage. The table is JW Winco's GN 300 (threaded stud, steel components, black oxide), inch and metric threads, six lever sizes. Each row is one lever size and thread; stud lengths l2 are the stock lengths in mm (the part number carries them: 3T45A19K is 1/4-20 × 45 mm). Special threads and lengths on request.\n- d3, d4, h1 to h4 are printed by JW Winco without definitions; they are the same for every thread of a lever size. The only difference between the inch-thread and metric-thread tables is d4 for the 30 mm lever: 12.5 on the inch-thread rows and 12 on the metric-thread rows (both as printed; .49 in = 12.5 mm). Cross-check: the GN 300 listings at EWM (M12 l1 108 × l2 63; M12 l1 92 × l2 40; M10 l1 78 × l2 32), Galaxus (M8 63 × 50; M16 108 × 32 under GN 300.1) match rows of this table.\n- Related versions (not tabled): GN 300.1 (stainless components), GN 300.4 (increased clamping force; Monroe's sheet lists four sizes l1 63 / 78 / 92 / 108 for M6 / M8 / M10 / M12 with its own letter set R, D, H, H1, h1, h2, d2, h that is not comparable), GN 300.5 (all stainless, l1 45 and 63 in the JW Winco sheet), GN 302 (straight lever) and GN 303.2 (push button, own page).\n- Numbers only: the lever's curved outline is not published as coordinates, so no file is made. Mounting: a tapped hole of the stud thread, or a through hole and the lever's own insert.\n\nlever length l1, mm  thread d1  stud lengths l2, mm  d3, mm  d4, mm  h1, mm  h2, mm  h3, mm  h4, mm\n30  10-32  10, 12, 16, 20, 25, 32  10  12.5  26.5  4  35  3.5\n30  10-24  12, 16, 20, 25, 32  10  12.5  26.5  4  35  3.5\n30  1/4-20  10, 12, 16, 20, 25, 32, 40, 45  10  12.5  26.5  4  35  3.5\n30  M3  10, 12, 16, 20, 25, 32  10  12  26.5  4  35  3.5\n30  M4  10, 12, 16, 20, 25, 32  10  12  26.5  4  35  3.5\n30  M5  12, 16, 20, 25, 32, 40, 50  10  12  26.5  4  35  3.5\n30  M6  10, 12, 16, 20, 25, 32, 40, 45, 50  10  12  26.5  4  35  3.5\n45  10-32  10, 12, 16, 20, 25, 32  10  13  24.5  4  35  3.5\n45  10-24  12, 16, 20, 25, 32  10  13  24.5  4  35  3.5\n45  1/4-20  10, 12, 16, 20, 25, 32, 40, 45  10  13  24.5  4  35  3.5\n45  M4  10, 12, 16, 20, 25, 32  10  13  24.5  4  35  3.5\n45  M5  12, 16, 20, 25, 32, 40, 50  10  13  24.5  4  35  3.5\n45  M6  10, 12, 16, 20, 25, 32, 40, 45, 50  10  13  24.5  4  35  3.5\n63  1/4-20  12, 16, 20, 25  13.5  17.5  31  6.5  45  4\n63  5/16-18  12, 16, 20, 25, 32, 40, 45, 50, 63  13.5  17.5  31  6.5  45  4\n63  3/8-16  16, 20, 25, 32, 40, 45, 50, 63  13.5  17.5  31  6.5  45  4\n63  M6  12, 16, 20, 25, 32, 40, 50, 63  13.5  17.5  31  6.5  45  4\n63  M8  12, 16, 20, 25, 32, 40, 45, 50, 63  13.5  17.5  31  6.5  45  4\n63  M10  16, 20, 25, 32, 40, 45, 50, 63, 80  13.5  17.5  31  6.5  45  4\n78  3/8-16  16, 20, 25, 32, 40, 45, 50, 63  16  21  36  8  55  4\n78  1/2-13  16, 20, 25, 32, 40, 45, 50  16  21  36  8  55  4\n78  M8  16, 20, 25, 32, 40, 45, 50, 63, 80  16  21  36  8  55  4\n78  M10  16, 20, 25, 32, 40, 45, 50, 63, 80  16  21  36  8  55  4\n78  M12  25, 32, 40, 50, 63, 80  16  21  36  8  55  4\n92  3/8-16  16, 20, 25, 32, 40, 45, 50, 63  19  24  43  11  65  4\n92  1/2-13  16, 20, 25, 32, 35, 40, 45, 50, 63  19  24  43  11  65  4\n92  M10  16, 20, 25, 32, 40, 45, 50, 63, 80  19  24  43  11  65  4\n92  M12  16, 20, 25, 32, 35, 40, 45, 50, 63, 80  19  24  43  11  65  4\n92  M16  25, 32, 40, 50, 63, 80  19  24  43  11  65  4\n108  1/2-13  25, 32, 40, 50, 55, 63  23  30  50.5  12  76  5\n108  5/8-11  32, 40, 50, 55, 63  23  30  50.5  12  76  5\n108  M12  25, 32, 40, 50, 63, 80, 120  23  30  50.5  12  76  5\n108  M16  25, 32, 40, 50, 63, 80, 120  23  30  50.5  12  76  5\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- JW Winco: GN 300 adjustable levers, zinc die-cast, threaded stud, inch and metric: l1, thread, stud length l2, d3, d4, h1 to h4 — web — Publisher's page; dimensions are facts — https://doc.pegamo.es/www/componente/doc/A651547F08F44403B906A7F5D088E2F4.pdf\n- EWM sales (Ganter GN 300 listings): GN 300 d1 M12 l1 108 l2 63; M12 l1 92 l2 40; M10 l1 78 l2 32 (cross-check) — web — Publisher's page; dimensions are facts — https://ewm-sales.com/en/Industrial_and_craft_supplies/Technical_trade/General_industrial_supplies/Machine_operating_element_and_standard_element_accessories/Clamping_levers/Verstellbarer_Klemmhebel_GN_300_d1_M_12mm_l1_108mm_l2_63mm_AG_GANTER--4601000488.html\n- Monroe Engineering: GN 300.4 adjustable levers with increased clamping force: sizes 63 / 78 / 92 / 108, M6 to M12 — web — Publisher's page; dimensions are facts — https://catalog.monroeengineering.com/Asset/GN-300-4-Adjustable-Handles-with-High-Tightening-Clamping-Force.pdf\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=adjustable-clamping-levers-gn-300\n",
 "sources": [
  {
   "publisher": "JW Winco",
   "title": "GN 300 adjustable levers, zinc die-cast, threaded stud, inch and metric: l1, thread, stud length l2, d3, d4, h1 to h4",
   "url": "https://doc.pegamo.es/www/componente/doc/A651547F08F44403B906A7F5D088E2F4.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "EWM sales (Ganter GN 300 listings)",
   "title": "GN 300 d1 M12 l1 108 l2 63; M12 l1 92 l2 40; M10 l1 78 l2 32 (cross-check)",
   "url": "https://ewm-sales.com/en/Industrial_and_craft_supplies/Technical_trade/General_industrial_supplies/Machine_operating_element_and_standard_element_accessories/Clamping_levers/Verstellbarer_Klemmhebel_GN_300_d1_M_12mm_l1_108mm_l2_63mm_AG_GANTER--4601000488.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Monroe Engineering",
   "title": "GN 300.4 adjustable levers with increased clamping force: sizes 63 / 78 / 92 / 108, M6 to M12",
   "url": "https://catalog.monroeengineering.com/Asset/GN-300-4-Adjustable-Handles-with-High-Tightening-Clamping-Force.pdf",
   "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": [
  "push-button-clamping-levers-gn-303-2",
  "cam-levers-gn-927",
  "star-knobs-din-6336",
  "ball-knobs-din-319",
  "fixed-handles-din-39",
  "handwheels-din-950-gn-322",
  "indexing-plungers-gn-617"
 ],
 "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": "stud thread d1 × l2",
   "exact": "M3 to M16 and #10-32 to 5/8-11, stud 10 to 120 mm",
   "mates": "a tapped hole of the same thread (or through hole and nut); the stud is a plain cylinder at the nominal major diameter",
   "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 lever length goes with an M8 GN 300?",
   "a": "63 mm (or 78 mm); the 63 mm lever takes M6, M8 and M10 and the 78 mm lever M8, M10 and M12."
  },
  {
   "q": "What stud lengths does a GN 300 have?",
   "a": "From 10 mm (small levers) to 120 mm (108 mm lever): for M8 on the 63 mm lever 12, 16, 20, 25, 32, 40, 45, 50 and 63 mm."
  },
  {
   "q": "What is the hub size of a GN 300 63 mm lever?",
   "a": "d3 13.5, d4 17.5, h1 31, h2 6.5, h3 45, h4 4 mm (letters as printed by JW Winco)."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/adjustable-clamping-levers-gn-300/index.md"
}