{
 "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": "toggle-switch-bushings-panel-holes",
 "name": "Toggle switch bushings and panel holes: 1/4-40, 15/32-32, M6 x 0.75, M12 x 1 (NKK, C&K 7000, Carling) + hole gauge",
 "kind": "standard",
 "category": "Electronic components",
 "group": "Panel cutouts",
 "year": null,
 "question": "What hole does a toggle switch need, and what are the 1/4-40, 15/32-32 and M12 bushing threads?",
 "tags": [
  "toggle switch",
  "bushing",
  "panel hole",
  "1/4-40",
  "15/32-32",
  "m12",
  "keyway",
  "nkk",
  "c&k",
  "carling",
  "mounting hole"
 ],
 "aliases": [
  "toggle switch hole size",
  "mini toggle switch mounting hole 1/4",
  "15/32 toggle switch hole",
  "toggle switch bushing thread 1/4-40",
  "carling toggle switch cutout 12.7 mm",
  "nkk toggle switch panel hole",
  "toggle switch keyway",
  "m12 x 1 toggle switch hole",
  "c&k 7000 toggle bushing",
  "toggle switch panel hole stl"
 ],
 "overall_mm": {
  "length": 55.5,
  "width": 24.7,
  "height": 3
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/toggle-switch-bushings-panel-holes/",
 "sheet_txt": "https://xemstudio.com/objects/toggle-switch-bushings-panel-holes/sheet.txt",
 "sheet": {
  "basis": "NKK series P and M catalog pages, the C&K 7000 series datasheet and a Carling toggle listing, as read; one hole gauge plate as a file",
  "overall_mm": {
   "length": 55.5,
   "width": 24.7,
   "height": 3
  },
  "notes": [
   "Miniature toggles use a 1/4-40 bushing (or M6 x 0.75 on the metric NKK versions), larger power toggles use 15/32-32 (Carling, C&K T / T1 actuators) or M12 x 1 (NKK 12 mm). The thread is the nominal major diameter: 6.35 mm for 1/4-40, about 11.9 mm for 15/32, 12 mm for M12 (the 15/32 figure is the inch size converted, not a printed number).",
   "Panel holes that are printed: NKK series P prints (6.35) / .250 in for the 6 mm bushing and (12.5) / .492 in for the 12 mm bushing; Carling's listing prints a circular 12.70 mm cutout for 15/32-32. The C&K 7000 datasheet read prints no hole number. NKK's catalog also draws (12.5) / .492 in for the large bushing, which agrees with series P. The 12.5 and 12.70 mm figures are different makers' holes for different bushings (M12 x 1 and 15/32-32), so they sit side by side on the gauge.",
   "Keyway and flat: NKK prints keyway and D-flat codes by bushing (listed above) and a keyway notch of (1.1) x (2.0) mm drawn with the 1/4-40 thread; this is the notch on the bushing, whose position in the panel is not printed as a labeled number, so no notch is drawn. C&K lists keyway bushings (D, D9, Y, Y9, H3, H4, Y1, Y3) and flat bushings (D8, H, Y4). Use the matching keyed washer; a keyway needs the hole cut with a notch or a tab washer.",
   "Panel thickness: NKK series P prints maximum thicknesses (.134 in / 3.4 mm, .102 in / 2.6 mm, .256 in / 6.5 mm, .217 in / 5.5 mm with keyway or locking ring) but the text read does not assign them to the 6 mm and 12 mm bushings, so they are not tabulated. C&K and Carling printed none.",
   "File: toggle-bushing-hole-gauge is a plate with the three published round holes at true size. Plate thickness 3 mm, spacing and corner radius are Xem's choices. Rockers: rocker-switch-panel-cutouts; wall-plate toggles: wall-plate-toggle-us; maker CAD is linked, not copied."
  ],
  "table": {
   "columns": [
    "maker / series",
    "bushing / actuator",
    "thread",
    "panel hole (as printed)",
    "keyway / flat",
    "source"
   ],
   "rows": [
    [
     "NKK series P",
     "6 mm bushing (.512 in white cap / .450 in flatted toggle)",
     "thread M6 P0.75",
     "panel hole (6.35) = .250 in",
     "keyway (flatted toggle E)",
     "NKK series P catalog pages"
    ],
    [
     "NKK series P",
     "12 mm bushing (.689 in large bat / .748 in white capped column)",
     "thread M12 P1",
     "panel hole (12.5) = .492 in",
     "keyway",
     "NKK series P catalog pages"
    ],
    [
     "NKK series M",
     "S1, A1, D1, L1 small bushings",
     "1/4-40; S1 bushing length .350 in (8.9 mm), A1 .280 in (7.1 mm)",
     "not labeled for the small bushings on these pages (a drawn .315 in / 8.0 mm is unlabeled and not used)",
     "keyway on S1, S2, A1, A2, S4, B1, L1, L2, L4; D-flat on D1, D3, D4, D8, L3, L8, B3; keyway notch (1.1) x (2.0) mm = .043 x .079 in drawn with the 1/4-40 thread",
     "NKK series M catalog pages"
    ],
    [
     "NKK series M",
     "S4, D4, D8, L4, L8 6 mm bushings",
     "M6 P0.75",
     "see series P",
     "see keyway / D-flat list above",
     "NKK series M catalog pages"
    ],
    [
     "NKK series M",
     "B1, B3 large bushings",
     "12 mm (.472 in) thread, M12 P1",
     "(12.5) dia .492 in in the panel cutout drawing",
     "B1 keyway; B3 D-flat",
     "NKK series M catalog pages"
    ],
    [
     "C&K 7000",
     "T and T1 actuators",
     "15/32-32 UNS-2A",
     "not printed",
     "bushing codes D, Y, H3, H4, Y1, Y3, Y9, D9 are keyway; D8, H, Y4 are flat",
     "C&K 7000 datasheet"
    ],
    [
     "C&K 7000",
     "all other actuators",
     "1/4-40 UNS-2A",
     "not printed",
     "same bushing codes",
     "C&K 7000 datasheet"
    ],
    [
     "C&K 7000",
     "bushing heights",
     "D, D8, D9 .280 in; Y, Y9 .350 in; H .296 in; H3 .315 in; Y1, Y4 .378 in; H4 8 mm (metric, high torque, keyway); Y3 8.9 mm (metric, keyway)",
     "not printed",
     "add .070 in (1.78 mm) to actuator lengths for D, D8, D9; hardware: two mounting nuts, one locking ring, one lockwasher with threaded bushings",
     "C&K 7000 datasheet"
    ],
    [
     "Carling toggle 110-73",
     "standard toggle",
     "15/32-32",
     "circular 12.70 mm",
     "not stated",
     "Carling 110-73 listing"
    ]
   ]
  }
 },
 "sheet_text": "Toggle switch bushings and panel holes: 1/4-40, 15/32-32, M6 x 0.75, M12 x 1 (NKK, C&K 7000, Carling) + hole gauge — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/toggle-switch-bushings-panel-holes/  (sheet CC BY 4.0)\nBasis: NKK series P and M catalog pages, the C&K 7000 series datasheet and a Carling toggle listing, as read; one hole gauge plate as a file\nCatalog version: 2026-10-20\n\nOverall (mm): length 55.5, width 24.7, height 3.0\n- Miniature toggles use a 1/4-40 bushing (or M6 x 0.75 on the metric NKK versions), larger power toggles use 15/32-32 (Carling, C&K T / T1 actuators) or M12 x 1 (NKK 12 mm). The thread is the nominal major diameter: 6.35 mm for 1/4-40, about 11.9 mm for 15/32, 12 mm for M12 (the 15/32 figure is the inch size converted, not a printed number).\n- Panel holes that are printed: NKK series P prints (6.35) / .250 in for the 6 mm bushing and (12.5) / .492 in for the 12 mm bushing; Carling's listing prints a circular 12.70 mm cutout for 15/32-32. The C&K 7000 datasheet read prints no hole number. NKK's catalog also draws (12.5) / .492 in for the large bushing, which agrees with series P. The 12.5 and 12.70 mm figures are different makers' holes for different bushings (M12 x 1 and 15/32-32), so they sit side by side on the gauge.\n- Keyway and flat: NKK prints keyway and D-flat codes by bushing (listed above) and a keyway notch of (1.1) x (2.0) mm drawn with the 1/4-40 thread; this is the notch on the bushing, whose position in the panel is not printed as a labeled number, so no notch is drawn. C&K lists keyway bushings (D, D9, Y, Y9, H3, H4, Y1, Y3) and flat bushings (D8, H, Y4). Use the matching keyed washer; a keyway needs the hole cut with a notch or a tab washer.\n- Panel thickness: NKK series P prints maximum thicknesses (.134 in / 3.4 mm, .102 in / 2.6 mm, .256 in / 6.5 mm, .217 in / 5.5 mm with keyway or locking ring) but the text read does not assign them to the 6 mm and 12 mm bushings, so they are not tabulated. C&K and Carling printed none.\n- File: toggle-bushing-hole-gauge is a plate with the three published round holes at true size. Plate thickness 3 mm, spacing and corner radius are Xem's choices. Rockers: rocker-switch-panel-cutouts; wall-plate toggles: wall-plate-toggle-us; maker CAD is linked, not copied.\n\nmaker / series  bushing / actuator  thread  panel hole (as printed)  keyway / flat  source\nNKK series P  6 mm bushing (.512 in white cap / .450 in flatted toggle)  thread M6 P0.75  panel hole (6.35) = .250 in  keyway (flatted toggle E)  NKK series P catalog pages\nNKK series P  12 mm bushing (.689 in large bat / .748 in white capped column)  thread M12 P1  panel hole (12.5) = .492 in  keyway  NKK series P catalog pages\nNKK series M  S1, A1, D1, L1 small bushings  1/4-40; S1 bushing length .350 in (8.9 mm), A1 .280 in (7.1 mm)  not labeled for the small bushings on these pages (a drawn .315 in / 8.0 mm is unlabeled and not used)  keyway on S1, S2, A1, A2, S4, B1, L1, L2, L4; D-flat on D1, D3, D4, D8, L3, L8, B3; keyway notch (1.1) x (2.0) mm = .043 x .079 in drawn with the 1/4-40 thread  NKK series M catalog pages\nNKK series M  S4, D4, D8, L4, L8 6 mm bushings  M6 P0.75  see series P  see keyway / D-flat list above  NKK series M catalog pages\nNKK series M  B1, B3 large bushings  12 mm (.472 in) thread, M12 P1  (12.5) dia .492 in in the panel cutout drawing  B1 keyway; B3 D-flat  NKK series M catalog pages\nC&K 7000  T and T1 actuators  15/32-32 UNS-2A  not printed  bushing codes D, Y, H3, H4, Y1, Y3, Y9, D9 are keyway; D8, H, Y4 are flat  C&K 7000 datasheet\nC&K 7000  all other actuators  1/4-40 UNS-2A  not printed  same bushing codes  C&K 7000 datasheet\nC&K 7000  bushing heights  D, D8, D9 .280 in; Y, Y9 .350 in; H .296 in; H3 .315 in; Y1, Y4 .378 in; H4 8 mm (metric, high torque, keyway); Y3 8.9 mm (metric, keyway)  not printed  add .070 in (1.78 mm) to actuator lengths for D, D8, D9; hardware: two mounting nuts, one locking ring, one lockwasher with threaded bushings  C&K 7000 datasheet\nCarling toggle 110-73  standard toggle  15/32-32  circular 12.70 mm  not stated  Carling 110-73 listing\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- NKK Switches: Series P toggle switches (P2011 to P2023): bushing M6 P0.75 and M12 P1, panel hole (6.35) and (12.5), keyway, hardware part numbers — web — Maker catalog pages (archive copy); numbers only — https://deramp.com/downloads/mfe_archive/050-Component%20Specifications/Switches/NKK%20PToggles.pdf\n- NKK Switches: Series M miniature toggle catalog pages A52-A63 (M2012 / M2021 family): bushings S1, A1, D1, L1 (1/4-40), S4 / D4 / D8 / L4 / L8 (M6 x 0.75), B1 / B3 (M12 x 1), keyway and D-flat — web — Maker catalog pages (distributor copy); numbers only — https://www.nyang-tech.com/datasheet/41330281449/NKK-Switches/M2021LL3G01.pdf\n- C&K (Littelfuse): 7000 series miniature toggle datasheet: bushing codes (D, D8, D9, Y, Y1, Y3, Y4, H, H3, H4, CW), 1/4-40 UNS-2A and 15/32-32 UNS-2A threads, keyway and flat — web — Maker datasheet (DigiKey HTML copy); numbers only — https://www.digikey.de/en/htmldatasheets/production/1205415/0/0/2/7103syzqe\n- Carling Technologies: Toggle switch 110-73 (GlobalSpec datasheet listing): panel cutout circular 12.70 mm, bushing thread 15/32-32 — web — Maker listing; numbers only — https://datasheets.globalspec.com/ds/carling-technologies/110-73/13f5092e-0ed2-4f80-88c9-bef9a2ed2187\n- NKK Switches: NKK Switches product pages (M-series and S-series toggles) with 3D CAD downloads per part — web — Maker site; CAD per part from the maker — https://www.nkkswitches.com/\n- C&K (Littelfuse): C&K 7000 series toggle product page (3D models per part) — web — Maker page; CAD per part from the maker — https://www.ckswitches.com/products/switches/product-details/Toggle/7000?page=6\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/toggle-switch-bushings-panel-holes/index.json\nAPI: https://xemstudio.com/api/geometry?object=toggle-switch-bushings-panel-holes\n",
 "sources": [
  {
   "publisher": "NKK Switches",
   "title": "Series P toggle switches (P2011 to P2023): bushing M6 P0.75 and M12 P1, panel hole (6.35) and (12.5), keyway, hardware part numbers",
   "url": "https://deramp.com/downloads/mfe_archive/050-Component%20Specifications/Switches/NKK%20PToggles.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker catalog pages (archive copy); numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "NKK Switches",
   "title": "Series M miniature toggle catalog pages A52-A63 (M2012 / M2021 family): bushings S1, A1, D1, L1 (1/4-40), S4 / D4 / D8 / L4 / L8 (M6 x 0.75), B1 / B3 (M12 x 1), keyway and D-flat",
   "url": "https://www.nyang-tech.com/datasheet/41330281449/NKK-Switches/M2021LL3G01.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker catalog pages (distributor copy); numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "C&K (Littelfuse)",
   "title": "7000 series miniature toggle datasheet: bushing codes (D, D8, D9, Y, Y1, Y3, Y4, H, H3, H4, CW), 1/4-40 UNS-2A and 15/32-32 UNS-2A threads, keyway and flat",
   "url": "https://www.digikey.de/en/htmldatasheets/production/1205415/0/0/2/7103syzqe",
   "formats": [
    "web"
   ],
   "license": "Maker datasheet (DigiKey HTML copy); numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Carling Technologies",
   "title": "Toggle switch 110-73 (GlobalSpec datasheet listing): panel cutout circular 12.70 mm, bushing thread 15/32-32",
   "url": "https://datasheets.globalspec.com/ds/carling-technologies/110-73/13f5092e-0ed2-4f80-88c9-bef9a2ed2187",
   "formats": [
    "web"
   ],
   "license": "Maker listing; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "NKK Switches",
   "title": "NKK Switches product pages (M-series and S-series toggles) with 3D CAD downloads per part",
   "url": "https://www.nkkswitches.com/",
   "formats": [
    "web"
   ],
   "license": "Maker site; CAD per part from the maker",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "C&K (Littelfuse)",
   "title": "C&K 7000 series toggle product page (3D models per part)",
   "url": "https://www.ckswitches.com/products/switches/product-details/Toggle/7000?page=6",
   "formats": [
    "web"
   ],
   "license": "Maker page; CAD per part from the maker",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "rocker-switch-panel-cutouts",
  "panel-cutouts",
  "wall-plate-toggle-us",
  "tactile-switches",
  "pushbutton-pilot-light-panel-holes",
  "potentiometer-panel-mount-bushings-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": "panel hole 6.35 mm (file toggle-bushing-hole-gauge)",
   "exact": "round hole 6.35 mm = .250 in (NKK series P)",
   "mates": "1/4-40 or M6 x 0.75 toggle bushing; the bushing passes through, a nut or locking ring clamps it",
   "fit": "slide",
   "files": "toggle-bushing-hole-gauge"
  },
  {
   "feature": "panel hole 12.5 mm (file toggle-bushing-hole-gauge)",
   "exact": "round hole 12.5 mm = .492 in (NKK series P and M large bushing)",
   "mates": "NKK 12 mm M12 x 1 toggle bushing",
   "fit": "slide",
   "files": "toggle-bushing-hole-gauge"
  },
  {
   "feature": "panel hole 12.70 mm (file toggle-bushing-hole-gauge)",
   "exact": "round hole 12.70 mm (Carling 110-73 circular cutout)",
   "mates": "15/32-32 toggle bushing",
   "fit": "slide",
   "files": "toggle-bushing-hole-gauge"
  }
 ],
 "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 hole does a mini toggle switch need?",
   "a": "NKK series P prints a 6.35 mm (.250 in) panel hole for its 6 mm (M6 x 0.75) bushing; 1/4-40 bushings are the same 1/4 in size. The C&K 7000 sheet read prints no hole number."
  },
  {
   "q": "What hole for a 15/32-32 toggle?",
   "a": "Carling's listing prints a circular 12.70 mm cutout for 15/32-32. NKK's 12 mm M12 x 1 bushing is (12.5) mm / .492 in."
  },
  {
   "q": "Do toggle switches have a keyway?",
   "a": "Yes on many bushings: NKK S1, S2, A1, A2, S4, B1, L1, L2, L4 are keyway and D1, D3, D4, D8, L3, L8, B3 are D-flat; C&K D, D9, Y, Y9, H3, H4, Y1, Y3 are keyway."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "toggle-bushing-hole-gauge-6p35-12p5-12p7",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/toggle-switch-bushings-panel-holes/toggle-bushing-hole-gauge-6p35-12p5-12p7.step",
   "stl": "https://xemstudio.com/files/hardware/toggle-switch-bushings-panel-holes/toggle-bushing-hole-gauge-6p35-12p5-12p7.stl",
   "note": "hole gauge plate, 55.5 x 24.7 x 3 mm, three round holes at the published panel holes 6.35 mm (.250 in, NKK 1/4-40 and M6 bushings), 12.5 mm (.492 in, NKK 12 mm M12 x 1 bushing) and 12.70 mm (Carling 15/32-32 bushing), smallest first, 6 mm between hole edges and 6 mm of plate round the largest hole; no keyway notch is drawn (its position is not printed as a labeled number); plate thickness and spacing are Xem choices"
  }
 ],
 "markdown": "https://xemstudio.com/objects/toggle-switch-bushings-panel-holes/index.md"
}