{
 "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": "reed-switch-glass-sizes",
 "name": "Reed switch glass capsule sizes: length and diameter by model (3.95 to 53.4 mm long, Ø1.5 to 5.4)",
 "kind": "standard",
 "category": "Electronics",
 "group": "Wiring & connectors",
 "year": null,
 "question": "How long and how wide is the glass capsule of a standard reed switch (KSK-1A66, 14 mm; GR100, 20 mm; 1A52, 21 mm)?",
 "tags": [
  "reed switch",
  "glass",
  "magnetic sensor",
  "reed relay",
  "sensor",
  "capsule",
  "console"
 ],
 "aliases": [
  "reed switch dimensions",
  "reed switch size",
  "14 mm reed switch",
  "20 mm reed switch",
  "reed switch glass diameter",
  "reed switch length",
  "reed sensor glass 2.2 mm",
  "ksk-1a66 dimensions",
  "gr100 reed switch",
  "reed switch lead diameter",
  "mini reed switch 10 mm",
  "reed switch pocket size"
 ],
 "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/reed-switch-glass-sizes/",
 "sheet_txt": "https://xemstudio.com/objects/reed-switch-glass-sizes/sheet.txt",
 "sheet": {
  "basis": "Standex Electronics reed switch product guide (via Heilind): maximums as printed",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "A reed switch is a pair of contacts sealed in a glass capsule; the capsule length and diameter set the sensor pocket, and the leads set the PCB or wire hole. The table is the Standex Electronics reed switch product guide (as hosted by Heilind): glass length and glass diameter are printed as maximums, lead diameter or lead section (width × thickness) as printed. Model names are the maker's part numbers, used as text only.",
   "Pocket and sensor-holder design: use the maximum length and diameter as the minimum space; leads are not part of the glass length. Gaps between models are real; other makers (Hamlin / Littelfuse, Coto) publish their own sizes and are not covered here.",
   "Not in the guide read: reed switch body names such as 'MK' or 'HE' families; sealed or moulded reed sensors (which are larger packages); glass lengths in inches. No files: a glass capsule is a cylinder (plain) and no outline beyond length and diameter is published.",
   "McMaster-Carr does not appear to list bare reed switches under a category the search could reach, so no McMaster link is given."
  ],
  "table": {
   "columns": [
    "model",
    "glass length, mm (max)",
    "glass Ø, mm (max)",
    "lead Ø or section, mm"
   ],
   "rows": [
    [
     "KSK-1A04",
     "3.95",
     "1.5",
     "0.8 × 0.15"
    ],
    [
     "KSK-1A80",
     "7",
     "1.8",
     "0.3"
    ],
    [
     "GP400",
     "10",
     "1.9",
     "0.43"
    ],
    [
     "KSK-1A87",
     "10",
     "2",
     "0.4"
    ],
    [
     "KSK-1A35",
     "10.5",
     "2.1",
     "1.2 × 0.2"
    ],
    [
     "KSK-1A35/1",
     "10.5",
     "2.1",
     "1.2 × 0.2"
    ],
    [
     "KSK-1A31",
     "11",
     "2.2",
     "0.5"
    ],
    [
     "KSK-1A46",
     "12",
     "2",
     "0.5"
    ],
    [
     "GR/GP501",
     "12.7",
     "2.3",
     "0.45"
    ],
    [
     "KSK-1A66",
     "14",
     "2.2",
     "0.5"
    ],
    [
     "KSK-1A66/3",
     "14",
     "2.2",
     "0.5"
    ],
    [
     "KSK-1C90F",
     "14",
     "2.54",
     "0.5"
    ],
    [
     "KSK-1C90U",
     "14",
     "2.54",
     "0.5"
    ],
    [
     "GR/GP560",
     "14.2",
     "2.3",
     "0.6"
    ],
    [
     "PR560",
     "14.2",
     "2.3",
     "0.6"
    ],
    [
     "KSK-1A55",
     "16.5",
     "2.8",
     "0.6"
    ],
    [
     "KSK-1A82",
     "16.5",
     "2.8",
     "0.6"
    ],
    [
     "GR100",
     "20",
     "2.5",
     "0.6"
    ],
    [
     "NL126",
     "20.3",
     "2.5",
     "0.7"
    ],
    [
     "PR126",
     "20.3",
     "2.5",
     "0.7"
    ],
    [
     "KSK-1A53",
     "20.5",
     "2.8",
     "0.6"
    ],
    [
     "KSK-1A52",
     "21",
     "2.75",
     "0.6"
    ],
    [
     "KSK-1A85",
     "21",
     "2.75",
     "0.6"
    ],
    [
     "KSK-1B85",
     "21",
     "2.75",
     "0.6"
    ],
    [
     "KSK-1E85",
     "21",
     "2.75",
     "0.6"
    ],
    [
     "KSK-1C10",
     "34.3",
     "5.16",
     "1.01"
    ],
    [
     "KSK-1A33",
     "52",
     "5.4",
     "0.5"
    ],
    [
     "KSK-1A54",
     "53.4",
     "5.4",
     "1.3"
    ],
    [
     "KSK-1A69",
     "53.4",
     "5.4",
     "2.49 × 0.54"
    ],
    [
     "KSK-1A83",
     "53.4",
     "5.4",
     "2.49 × 0.54"
    ]
   ]
  }
 },
 "sheet_text": "Reed switch glass capsule sizes: length and diameter by model (3.95 to 53.4 mm long, Ø1.5 to 5.4) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/reed-switch-glass-sizes/  (sheet CC BY 4.0)\nBasis: Standex Electronics reed switch product guide (via Heilind): maximums as printed\nCatalog version: 2026-10-20\n\nSizes: see table below\n- A reed switch is a pair of contacts sealed in a glass capsule; the capsule length and diameter set the sensor pocket, and the leads set the PCB or wire hole. The table is the Standex Electronics reed switch product guide (as hosted by Heilind): glass length and glass diameter are printed as maximums, lead diameter or lead section (width × thickness) as printed. Model names are the maker's part numbers, used as text only.\n- Pocket and sensor-holder design: use the maximum length and diameter as the minimum space; leads are not part of the glass length. Gaps between models are real; other makers (Hamlin / Littelfuse, Coto) publish their own sizes and are not covered here.\n- Not in the guide read: reed switch body names such as 'MK' or 'HE' families; sealed or moulded reed sensors (which are larger packages); glass lengths in inches. No files: a glass capsule is a cylinder (plain) and no outline beyond length and diameter is published.\n- McMaster-Carr does not appear to list bare reed switches under a category the search could reach, so no McMaster link is given.\n\nmodel  glass length, mm (max)  glass Ø, mm (max)  lead Ø or section, mm\nKSK-1A04  3.95  1.5  0.8 × 0.15\nKSK-1A80  7  1.8  0.3\nGP400  10  1.9  0.43\nKSK-1A87  10  2  0.4\nKSK-1A35  10.5  2.1  1.2 × 0.2\nKSK-1A35/1  10.5  2.1  1.2 × 0.2\nKSK-1A31  11  2.2  0.5\nKSK-1A46  12  2  0.5\nGR/GP501  12.7  2.3  0.45\nKSK-1A66  14  2.2  0.5\nKSK-1A66/3  14  2.2  0.5\nKSK-1C90F  14  2.54  0.5\nKSK-1C90U  14  2.54  0.5\nGR/GP560  14.2  2.3  0.6\nPR560  14.2  2.3  0.6\nKSK-1A55  16.5  2.8  0.6\nKSK-1A82  16.5  2.8  0.6\nGR100  20  2.5  0.6\nNL126  20.3  2.5  0.7\nPR126  20.3  2.5  0.7\nKSK-1A53  20.5  2.8  0.6\nKSK-1A52  21  2.75  0.6\nKSK-1A85  21  2.75  0.6\nKSK-1B85  21  2.75  0.6\nKSK-1E85  21  2.75  0.6\nKSK-1C10  34.3  5.16  1.01\nKSK-1A33  52  5.4  0.5\nKSK-1A54  53.4  5.4  1.3\nKSK-1A69  53.4  5.4  2.49 × 0.54\nKSK-1A83  53.4  5.4  2.49 × 0.54\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Standex Electronics (Heilind copy): Reed switch product guide: glass length max, glass diameter max, lead diameter per model — web — Publisher's page; dimensions are facts — https://development.heilind.com/cms/wp-content/uploads/2022/06/standex-electronics-reed-switches.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=reed-switch-glass-sizes\n",
 "sources": [
  {
   "publisher": "Standex Electronics (Heilind copy)",
   "title": "Reed switch product guide: glass length max, glass diameter max, lead diameter per model",
   "url": "https://development.heilind.com/cms/wp-content/uploads/2022/06/standex-electronics-reed-switches.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": [
  "omron-snap-action-switches-d2f-ss-v",
  "tactile-switches",
  "relays-tht",
  "adafruit-buttons-joysticks-encoders",
  "neodymium-disc-magnets"
 ],
 "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": "reed switch glass capsule",
   "exact": "length 3.95 to 53.4 and Ø1.5 to 5.4 (maximums, per model)",
   "mates": "sensor pocket or bore (use the model's maximums)",
   "fit": "slide",
   "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": "How big is a 14 mm reed switch?",
   "a": "KSK-1A66: glass 14 mm long and 2.2 mm in diameter (both maximum), 0.5 mm leads."
  },
  {
   "q": "How big is a 20 mm reed switch?",
   "a": "GR100: glass 20.0 mm × Ø2.5 (max), 0.6 mm leads. NL126 / PR126: 20.3 × 2.5."
  },
  {
   "q": "What is the smallest reed switch in the guide?",
   "a": "KSK-1A04: 3.95 mm × Ø1.5 with 0.8 × 0.15 mm flat leads."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/reed-switch-glass-sizes/index.md"
}