{
 "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": "bayonet-joint-mechanism",
 "name": "Bayonet joint: two studs in L-slots, locked by a 30° turn",
 "kind": "hardware",
 "category": "Mechanisms",
 "group": "Couplings & joints",
 "year": null,
 "question": "How does a bayonet joint lock?",
 "tags": [
  "mechanism",
  "couplings & joints",
  "kinematics",
  "507 mechanical movements"
 ],
 "aliases": [
  "bayonet joint",
  "bayonet mount",
  "bayonet coupling",
  "twist lock",
  "unión de bayoneta",
  "Bajonettverschluss"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 1,
 "url": "https://xemstudio.com/objects/bayonet-joint-mechanism/",
 "sheet_txt": "https://xemstudio.com/objects/bayonet-joint-mechanism/sheet.txt",
 "sheet": {
  "basis": "Xem Studio design following Brown No. 245 (1868)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Two studs on the inner tube slide straight into the two L-shaped slots of the socket; a part turn then carries them along the slots' short legs to their closed ends, where they hold the tubes together against being pulled apart. Turning back and pulling releases it.",
   "Ø20 tube in a Ø20 socket bore (line on line), Ø3 studs, slots 3 wide, 8 mm deep with a 30° turn; drawn locked, each stud seated in the round end of its slot.",
   "Brown's No. 245 (bayonet joint).",
   "Parts (each has its own page): bayonet-tube-20x14-studs-3, bayonet-socket-24x20-l-slots, dowel-pins-metric.",
   "Brown's movement No. 245 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size."
  ],
  "table": {
   "columns": [
    "parameter",
    "value"
   ],
   "rows": [
    [
     "tube",
     "Ø20"
    ],
    [
     "studs",
     "2 × Ø3"
    ],
    [
     "slot",
     "8 axial + 30° turn, 3 wide"
    ],
    [
     "lock",
     "30° turn"
    ]
   ]
  }
 },
 "sheet_text": "Bayonet joint: two studs in L-slots, locked by a 30° turn — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/bayonet-joint-mechanism/  (sheet CC BY 4.0; files Xem Studio Design License, https://xemstudio.com/license/)\nBasis: Xem Studio design following Brown No. 245 (1868)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Two studs on the inner tube slide straight into the two L-shaped slots of the socket; a part turn then carries them along the slots' short legs to their closed ends, where they hold the tubes together against being pulled apart. Turning back and pulling releases it.\n- Ø20 tube in a Ø20 socket bore (line on line), Ø3 studs, slots 3 wide, 8 mm deep with a 30° turn; drawn locked, each stud seated in the round end of its slot.\n- Brown's No. 245 (bayonet joint).\n- Parts (each has its own page): bayonet-tube-20x14-studs-3, bayonet-socket-24x20-l-slots, dowel-pins-metric.\n- Brown's movement No. 245 (1868) shows it; this model is a Xem Studio design following his figure, every part at true size.\n\nparameter  value\ntube  Ø20\nstuds  2 × Ø3\nslot  8 axial + 30° turn, 3 wide\nlock  30° turn\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Henry T. Brown (1868, public domain): Five Hundred and Seven Mechanical Movements — scan on archive.org — web — Publisher's page; dimensions are facts — https://archive.org/details/fivehundredseven00browiala\n- 507movements.com: Brown's movement No. 245: figure, his text and an animation — web — Publisher's page; dimensions are facts — https://507movements.com/mm_245.html\n\nFree files (Xem Studio Design License, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/bayonet-joint-mechanism/index.json\nAPI: https://xemstudio.com/api/geometry?object=bayonet-joint-mechanism\n",
 "sources": [
  {
   "publisher": "Henry T. Brown (1868, public domain)",
   "title": "Five Hundred and Seven Mechanical Movements — scan on archive.org",
   "url": "https://archive.org/details/fivehundredseven00browiala",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "507movements.com",
   "title": "Brown's movement No. 245: figure, his text and an animation",
   "url": "https://507movements.com/mm_245.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "bayonet-tube-20x14-studs-3",
  "bayonet-socket-24x20-l-slots",
  "dowel-pins-metric"
 ],
 "fits": [],
 "dimensions": "exact (nominal, no printing tolerance)",
 "dimension_rule": "All geometry on Xem Studio is exact (nominal, true size) with no printing tolerance. 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.",
 "mating": [],
 "faq": [
  {
   "q": "How does a bayonet joint lock?",
   "a": "Two studs on the inner tube slide straight into the two L-shaped slots of the socket; a part turn then carries them along the slots' short legs to their closed ends, where they hold the tubes together against being pulled apart. Turning back and pulling releases it."
  }
 ],
 "files_license": {
  "name": "Xem Studio Design License",
  "holder": "Xem Studio",
  "url": "https://xemstudio.com/license/",
  "note": "Xem Studio's own design: free to use, print, modify and sell things made from it; not to be republished or redistributed as files."
 },
 "offers": [
  {
   "file": "bayonet-joint-mechanism-assembly",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "Xem Studio Design License",
   "step": "https://xemstudio.com/files/hardware/bayonet-joint-mechanism/bayonet-joint-mechanism-assembly.step",
   "stl": "https://xemstudio.com/files/hardware/bayonet-joint-mechanism/bayonet-joint-mechanism-assembly.stl",
   "note": "Assembled mechanism, all parts placed at one pose (STEP keeps each part separate)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/bayonet-joint-mechanism/index.md"
}