{
 "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": "phone-mount-ball-17mm",
 "name": "17 mm ball joint for phone mounts (ball stud)",
 "kind": "hardware",
 "category": "Everyday mounts",
 "group": "Adapter blocks",
 "year": null,
 "question": "What size is the ball on a car phone mount?",
 "tags": [
  "phone mount",
  "ball joint",
  "car mount",
  "17mm ball",
  "vent mount",
  "adapter"
 ],
 "aliases": [
  "17mm ball mount",
  "17mm ball joint",
  "phone holder ball size",
  "car phone mount ball",
  "17mm ball step",
  "17mm ball stl",
  "phone mount ball head"
 ],
 "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/phone-mount-ball-17mm/",
 "sheet_txt": "https://xemstudio.com/objects/phone-mount-ball-17mm/sheet.txt",
 "sheet": {
  "basis": "The 17 mm ball is the de facto size of car and bike phone-holder ball joints, as named in maker listings (e.g. OOKWE's universal 17 mm ball head vent adapter) and community socket sets; no maker publishes the socket",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Most clip-on car phone holders, vent clips, dashboard and suction bases join with a Ø17 mm ball on the base and a split socket with a screw collar on the phone head.",
   "File: a ball stud with the Ø17.0 ball (the interface) on a Ø8 neck and a Ø20 × 4 foot. The neck and foot are my design, to union onto your own base (a clamp ring, a vent clip, a plate).",
   "The socket side (its split, the collar thread and the cup depth) is not published by any maker I found and is not drawn. A socket is sized to grip Ø17.0.",
   "This is not the 1 in (25.4) ball of RAM-style B-size mounts: see ram-mount-ball-sizes."
  ],
  "table": {
   "columns": [
    "feature",
    "mm",
    "from"
   ],
   "rows": [
    [
     "ball",
     "Ø17.0",
     "maker listings (OOKWE), community socket sets"
    ],
    [
     "neck",
     "Ø8",
     "my design"
    ],
    [
     "foot",
     "Ø20 × 4",
     "my design"
    ],
    [
     "socket, collar thread",
     "not published",
     "—"
    ]
   ]
  }
 },
 "sheet_text": "17 mm ball joint for phone mounts (ball stud) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/phone-mount-ball-17mm/  (CC BY 4.0)\nBasis: The 17 mm ball is the de facto size of car and bike phone-holder ball joints, as named in maker listings (e.g. OOKWE's universal 17 mm ball head vent adapter) and community socket sets; no maker publishes the socket\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Most clip-on car phone holders, vent clips, dashboard and suction bases join with a Ø17 mm ball on the base and a split socket with a screw collar on the phone head.\n- File: a ball stud with the Ø17.0 ball (the interface) on a Ø8 neck and a Ø20 × 4 foot. The neck and foot are my design, to union onto your own base (a clamp ring, a vent clip, a plate).\n- The socket side (its split, the collar thread and the cup depth) is not published by any maker I found and is not drawn. A socket is sized to grip Ø17.0.\n- This is not the 1 in (25.4) ball of RAM-style B-size mounts: see ram-mount-ball-sizes.\n\nfeature  mm  from\nball  Ø17.0  maker listings (OOKWE), community socket sets\nneck  Ø8  my design\nfoot  Ø20 × 4  my design\nsocket, collar thread  not published  —\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- OOKWE (listing by Walmart): Car air vent mount clip adapter, universal 17 mm ball head — web — reference [verify license at link] — https://www.walmart.com/ip/945843992\n- MakerWorld (community): Ball joint socket set for phone mounts (17 mm), described as the industry-standard 17 mm ball system — STL/3MF — varies per upload [verify license at link] — https://makerworld.com/en/models/3070848\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/phone-mount-ball-17mm/index.json\nAPI: https://xemstudio.com/api/geometry?object=phone-mount-ball-17mm\n",
 "sources": [
  {
   "publisher": "OOKWE (listing by Walmart)",
   "title": "Car air vent mount clip adapter, universal 17 mm ball head",
   "url": "https://www.walmart.com/ip/945843992",
   "formats": [
    "web"
   ],
   "license": "reference",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "MakerWorld (community)",
   "title": "Ball joint socket set for phone mounts (17 mm), described as the industry-standard 17 mm ball system",
   "url": "https://makerworld.com/en/models/3070848",
   "formats": [
    "STL/3MF"
   ],
   "license": "varies per upload",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "ram-mount-ball-sizes",
  "handlebar-clamp-rings",
  "car-air-vent-slats",
  "camera-thread-bosses-1-4-20"
 ],
 "fits": [
  {
   "role": "Goes in or on",
   "items": [
    {
     "slug": "handlebar-clamp-rings",
     "why": "union onto a bar clamp"
    },
    {
     "slug": "car-air-vent-slats",
     "why": "on a vent clip"
    }
   ]
  },
  {
   "role": "Alternatives",
   "items": [
    {
     "slug": "ram-mount-ball-sizes",
     "why": "1 in RAM-style B ball for heavier heads"
    }
   ]
  }
 ],
 "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": "ball",
   "exact": "Ø17.0",
   "mates": "phone-head split socket with a screw collar",
   "fit": "socket",
   "files": "ball-stud-"
  }
 ],
 "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 size is the ball on a car phone holder?",
   "a": "17 mm on most clip-on and vent phone holders; the phone head's socket grips the Ø17 ball."
  },
  {
   "q": "Is the 17 mm ball the same as a RAM ball?",
   "a": "No: RAM B-size balls are 1 in (25.4 mm). See ram-mount-ball-sizes."
  },
  {
   "q": "Can I put a 17 mm ball on a bike bar?",
   "a": "Yes: union the stud onto a handlebar-clamp-rings ring for your bar Ø."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "ball-stud-17",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/phone-mount-ball-17mm/ball-stud-17.step",
   "stl": "https://xemstudio.com/files/hardware/phone-mount-ball-17mm/ball-stud-17.stl",
   "note": "17 mm ball stud: Ø17.0 ball on a Ø8 neck (neck 6 clear below the ball) on a Ø20 × 4 foot; ball centre 17.500 above the foot face. Ball exact; neck and foot are my design"
  }
 ],
 "markdown": "https://xemstudio.com/objects/phone-mount-ball-17mm/index.md"
}