{
 "version": "2026-10-20",
 "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.",
 "slug": "push-fit-fittings",
 "name": "Push-fit fitting envelopes: 4 / 6 / 8 mm tube, G1/8 and G1/4 thread stubs",
 "kind": "hardware",
 "category": "Hardware",
 "group": "Pipe & fittings",
 "year": null,
 "question": "What are the dimensions of a 6 mm push-fit fitting?",
 "tags": [
  "push fit",
  "pneumatic",
  "fitting",
  "bspp",
  "stirling",
  "long earth society"
 ],
 "aliases": [
  "push fit fitting 6mm",
  "push to connect fitting dimensions",
  "pneumatic fitting g1/8",
  "push fit envelope step",
  "pc6-01 dimensions"
 ],
 "overall_mm": {
  "length": null,
  "width": null,
  "height": null
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": true,
 "free_files": 4,
 "url": "https://xemstudio.com/objects/push-fit-fittings/",
 "sheet_txt": "https://xemstudio.com/objects/push-fit-fittings/sheet.txt",
 "sheet": {
  "basis": "Push-fit (push-to-connect) envelope: socket = PU tube OD, 12 deep; BSPP thread stub at the G major diameter (G1/8 Ø9.73, G1/4 Ø13.16)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Each file is an envelope of a straight push-fit fitting: a Ø(tube OD + 8) × 14 body, a 2 mm collar on top, and an 8 mm thread stub below; 24 mm overall.",
   "The tube socket is drawn at the PU tube OD exactly (Ø4, Ø6, Ø8) and 12 mm deep, with a through bore of Ø2, Ø4 or Ø6.",
   "Thread stubs are plain cylinders at the BSPP major diameter: G1/8 Ø9.73, G1/4 Ø13.16; threads are not modelled.",
   "Sizes: 4 mm tube / G1/8, 6 mm / G1/8, 6 mm / G1/4, 8 mm / G1/4."
  ],
  "table": {
   "columns": [
    "file",
    "tube_od_mm",
    "socket_depth_mm",
    "thread",
    "stub_od_mm",
    "overall_mm"
   ],
   "rows": [
    [
     "pushfit-4mm-g1-8",
     4,
     12,
     "G1/8",
     9.73,
     24
    ],
    [
     "pushfit-6mm-g1-8",
     6,
     12,
     "G1/8",
     9.73,
     24
    ],
    [
     "pushfit-6mm-g1-4",
     6,
     12,
     "G1/4",
     13.16,
     24
    ],
    [
     "pushfit-8mm-g1-4",
     8,
     12,
     "G1/4",
     13.16,
     24
    ]
   ]
  }
 },
 "sheet_text": "Push-fit fitting envelopes: 4 / 6 / 8 mm tube, G1/8 and G1/4 thread stubs — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/push-fit-fittings/  (CC BY 4.0)\nBasis: Push-fit (push-to-connect) envelope: socket = PU tube OD, 12 deep; BSPP thread stub at the G major diameter (G1/8 Ø9.73, G1/4 Ø13.16)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Each file is an envelope of a straight push-fit fitting: a Ø(tube OD + 8) × 14 body, a 2 mm collar on top, and an 8 mm thread stub below; 24 mm overall.\n- The tube socket is drawn at the PU tube OD exactly (Ø4, Ø6, Ø8) and 12 mm deep, with a through bore of Ø2, Ø4 or Ø6.\n- Thread stubs are plain cylinders at the BSPP major diameter: G1/8 Ø9.73, G1/4 Ø13.16; threads are not modelled.\n- Sizes: 4 mm tube / G1/8, 6 mm / G1/8, 6 mm / G1/4, 8 mm / G1/4.\n\nfile  tube_od_mm  socket_depth_mm  thread  stub_od_mm  overall_mm\npushfit-4mm-g1-8  4  12  G1/8  9.73  24\npushfit-6mm-g1-8  6  12  G1/8  9.73  24\npushfit-6mm-g1-4  6  12  G1/4  13.16  24\npushfit-8mm-g1-4  8  12  G1/4  13.16  24\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Wikipedia: Hose barb — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Hose_barb\n- Wikipedia: Push-fit fitting — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Push-to-connect_fitting\n- McMaster-Carr: Tubing (free STEP per part, for your own design use; no redistribution) — STEP, PDF — McMaster-Carr site terms [verify license at link] — https://www.mcmaster.com/products/tubing/\n- Long Earth Society: Engine and rig builds — web, video — LES site — https://longearthsociety.com/engineering/\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 4 parts): https://xemstudio.com/files/hardware/push-fit-fittings/index.json\nAPI: https://xemstudio.com/api/geometry?object=push-fit-fittings\n",
 "sources": [
  {
   "publisher": "Wikipedia",
   "title": "Hose barb",
   "url": "https://en.wikipedia.org/wiki/Hose_barb",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Wikipedia",
   "title": "Push-fit fitting",
   "url": "https://en.wikipedia.org/wiki/Push-to-connect_fitting",
   "formats": [
    "web"
   ],
   "license": "CC BY-SA 4.0 (text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Tubing (free STEP per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/tubing/",
   "formats": [
    "STEP",
    "PDF"
   ],
   "license": "McMaster-Carr site terms",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Long Earth Society",
   "title": "Engine and rig builds",
   "url": "https://longearthsociety.com/engineering/",
   "formats": [
    "web",
    "video"
   ],
   "license": "LES site",
   "license_verified": true,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "pu-pneumatic-tube",
  "bsp-thread-envelopes",
  "hose-barbs",
  "o-rings-metric"
 ],
 "fits": [
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "bsp-thread-envelopes",
     "why": "G1/8 or G1/4 stub into a female BSPP port"
    }
   ]
  },
  {
   "role": "Connects to",
   "items": [
    {
     "slug": "pu-pneumatic-tube",
     "why": "tube OD into the socket drawn at the OD"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "hose-barbs",
     "why": "for soft silicone tube"
    }
   ]
  }
 ],
 "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": [
  {
   "feature": "tube socket",
   "exact": "Ø4 / Ø6 / Ø8 × 12",
   "mates": "PU tube OD",
   "fit": "press",
   "files": "pushfit-"
  },
  {
   "feature": "thread stub",
   "exact": "G1/8 Ø9.73 / G1/4 Ø13.16",
   "mates": "female BSPP port",
   "fit": "designed",
   "files": "pushfit-"
  }
 ],
 "fit_classes": {
  "press": "stays put: pin, tube, bearing or magnet held by interference. Typical FDM: hole +0.0 to +0.1 mm on diameter.",
  "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. Typical FDM: +0.2 mm.",
  "run": "turns or slides in use: pin in a link, rod through a guide. Typical FDM: +0.3 mm.",
  "socket": "large sliding fit: syringe barrel, sleeve, bobbin in a bore. Typical FDM: +0.3 mm.",
  "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 thread is on a 6 mm push-fit fitting?",
   "a": "Usually G1/8 or G1/4 BSPP; the stubs here are Ø9.73 and Ø13.16, the G major diameters."
  },
  {
   "q": "How deep does the tube go into a push-fit?",
   "a": "The socket is drawn 12 mm deep at the tube OD."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "pushfit-4mm-g1-8",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/pushfit-4mm-g1-8.step",
   "stl": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/pushfit-4mm-g1-8.stl",
   "note": "push-fit fitting envelope: body Ø12 × 14, release collet Ø8 × 2, Ø4 tube socket 12 deep from the collet face, G1/8 thread stub (Ø9.73 major) × 8"
  },
  {
   "file": "pushfit-6mm-g1-8",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/pushfit-6mm-g1-8.step",
   "stl": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/pushfit-6mm-g1-8.stl",
   "note": "push-fit fitting envelope: body Ø14 × 14, release collet Ø10 × 2, Ø6 tube socket 12 deep from the collet face, G1/8 thread stub (Ø9.73 major) × 8"
  },
  {
   "file": "pushfit-6mm-g1-4",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/pushfit-6mm-g1-4.step",
   "stl": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/pushfit-6mm-g1-4.stl",
   "note": "push-fit fitting envelope: body Ø14 × 14, release collet Ø10 × 2, Ø6 tube socket 12 deep from the collet face, G1/4 thread stub (Ø13.16 major) × 8"
  },
  {
   "file": "pushfit-8mm-g1-4",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/pushfit-8mm-g1-4.step",
   "stl": "https://xemstudio.com/files/hardware/silicone-tube-and-fittings/pushfit-8mm-g1-4.stl",
   "note": "push-fit fitting envelope: body Ø16 × 14, release collet Ø12 × 2, Ø8 tube socket 12 deep from the collet face, G1/4 thread stub (Ø13.16 major) × 8"
  }
 ],
 "markdown": "https://xemstudio.com/objects/push-fit-fittings/index.md"
}