{
 "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": "ball-knobs-din-319",
 "name": "Ball knobs, DIN 319 (plastic), Ø16–50: thread M4–M12, neck diameter d4, height h and thread depth",
 "kind": "standard",
 "category": "Hardware",
 "group": "Knobs, handles & feet",
 "year": null,
 "question": "What are the dimensions of a DIN 319 ball knob, and which thread does a Ø25 or Ø40 ball knob have?",
 "tags": [
  "ball knob",
  "din 319",
  "knob",
  "thread knob",
  "operating element",
  "halder",
  "ganter",
  "tool"
 ],
 "aliases": [
  "DIN 319 ball knob",
  "Kugelknopf DIN 319",
  "ball knob M6",
  "25 mm ball knob thread",
  "ball knob dimensions",
  "round knob M8 40 mm",
  "DIN319 C",
  "ball knob height"
 ],
 "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/ball-knobs-din-319/",
 "sheet_txt": "https://xemstudio.com/objects/ball-knobs-din-319/sheet.txt",
 "sheet": {
  "basis": "Halder's DIN 319 ball knob catalog page (form C with moulded thread and form E with threaded bush, Ø16 to 50); Ganter's DIN 319 datasheet as a cross-check; numbers only",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Halder's table (plastic ball knobs, mm): d1 ball diameter, d2 thread, d4 ≈ and h ≈ (both marked approximate on the page) and the minimum thread depth, t1 for form C (moulded-in thread) and t2 for form E (threaded bush); the page does not define t1, t2 or d4 in text. The page lists each size in black and in red with identical dimensions, so one row per size is shown. The Ø16 form E has a brass bush (page footnote). Only 24 of the page's 30 listed rows were read, and form M (taper bore) did not appear in them, so those variants are not covered.",
   "Ganter's DIN 319 datasheet sample rows (Ø16 with M4, Ø20 M5, Ø25 M6, Ø32 M8, Ø40 M10) show d4 8, 12, 15, 18, 22 and h 15, 18, 22.5, 29, 37, which match the Halder figures; the datasheet text has more values per row than headers, so its depth columns are not used and the Halder depth figures are the ones shown. Ganter's page also lists steel, aluminum and stainless ball knobs, and says these are 'not on the official DIN standard sheet'. Types there: C tapped hole, E tapped bush, K plain hole H7, L tolerance ring (press-on), M tapped bore (press-on).",
   "DIN 319 is a ball knob; the DIN 6336 star knob and DIN 39 fixed handle are separate pages. No file: the ball is a sphere of Ø d1 with a flat and a neck whose profile is not given as numbers in the sources read (d4 and h are approximate). McMaster-Carr sells threaded ball knobs with per-part STEP; linked, not copied."
  ],
  "table": {
   "columns": [
    "d1 (ball Ø)",
    "d2 thread",
    "d4 ≈",
    "h ≈",
    "t1 min (form C)",
    "t2 min (form E)"
   ],
   "rows": [
    [
     "16",
     "M4",
     "~8",
     "~15",
     "7",
     "6"
    ],
    [
     "20",
     "M5",
     "~12",
     "~18",
     "9",
     "7.5"
    ],
    [
     "25",
     "M6",
     "~15",
     "~22.5",
     "11",
     "9"
    ],
    [
     "32",
     "M8",
     "~18",
     "~29",
     "14",
     "12"
    ],
    [
     "40",
     "M10",
     "~22",
     "~37",
     "18",
     "15"
    ],
    [
     "50",
     "M12",
     "~28",
     "~46",
     "21",
     "18"
    ]
   ]
  }
 },
 "sheet_text": "Ball knobs, DIN 319 (plastic), Ø16–50: thread M4–M12, neck diameter d4, height h and thread depth — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/ball-knobs-din-319/  (sheet CC BY 4.0)\nBasis: Halder's DIN 319 ball knob catalog page (form C with moulded thread and form E with threaded bush, Ø16 to 50); Ganter's DIN 319 datasheet as a cross-check; numbers only\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Halder's table (plastic ball knobs, mm): d1 ball diameter, d2 thread, d4 ≈ and h ≈ (both marked approximate on the page) and the minimum thread depth, t1 for form C (moulded-in thread) and t2 for form E (threaded bush); the page does not define t1, t2 or d4 in text. The page lists each size in black and in red with identical dimensions, so one row per size is shown. The Ø16 form E has a brass bush (page footnote). Only 24 of the page's 30 listed rows were read, and form M (taper bore) did not appear in them, so those variants are not covered.\n- Ganter's DIN 319 datasheet sample rows (Ø16 with M4, Ø20 M5, Ø25 M6, Ø32 M8, Ø40 M10) show d4 8, 12, 15, 18, 22 and h 15, 18, 22.5, 29, 37, which match the Halder figures; the datasheet text has more values per row than headers, so its depth columns are not used and the Halder depth figures are the ones shown. Ganter's page also lists steel, aluminum and stainless ball knobs, and says these are 'not on the official DIN standard sheet'. Types there: C tapped hole, E tapped bush, K plain hole H7, L tolerance ring (press-on), M tapped bore (press-on).\n- DIN 319 is a ball knob; the DIN 6336 star knob and DIN 39 fixed handle are separate pages. No file: the ball is a sphere of Ø d1 with a flat and a neck whose profile is not given as numbers in the sources read (d4 and h are approximate). McMaster-Carr sells threaded ball knobs with per-part STEP; linked, not copied.\n\nd1 (ball Ø)  d2 thread  d4 ≈  h ≈  t1 min (form C)  t2 min (form E)\n16  M4  ~8  ~15  7  6\n20  M5  ~12  ~18  9  7.5\n25  M6  ~15  ~22.5  11  9\n32  M8  ~18  ~29  14  12\n40  M10  ~22  ~37  18  15\n50  M12  ~28  ~46  21  18\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Halder: DIN 319 ball knobs (plastic), form C (moulded thread) and form E (threaded bush): d1, d2, d4 ≈, h ≈, t1 / t2 min; Ø16 to 50 (24 of 30 listed rows read) — web — Maker catalog page; numbers only. d4 and h are approximate (~) on the page — https://halder.com/PM/Standard-Parts/Operating-Elements/Thumb-Knobs/Ball-Knobs-DIN-319\n- Elesa+Ganter: DIN 319 ball knobs datasheet (types C, E, K, L, M; KU / KT / ST / AL / NI): sample rows d1, d2, d3, d4, h, t1, t2 — web — Maker datasheet; used as a cross-check only (column alignment unclear in the text) — https://elesa-ganter.be/technicaldatasheet/DIN 319.pdf/en\n- McMaster-Carr: Metric ball knobs (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/metric-ball-knobs/\n- McMaster-Carr: Threaded ball knobs (free STEP/IGES per part, for your own design use; no redistribution) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/threaded-ball-knobs\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=ball-knobs-din-319\n",
 "sources": [
  {
   "publisher": "Halder",
   "title": "DIN 319 ball knobs (plastic), form C (moulded thread) and form E (threaded bush): d1, d2, d4 ≈, h ≈, t1 / t2 min; Ø16 to 50 (24 of 30 listed rows read)",
   "url": "https://halder.com/PM/Standard-Parts/Operating-Elements/Thumb-Knobs/Ball-Knobs-DIN-319",
   "formats": [
    "web"
   ],
   "license": "Maker catalog page; numbers only. d4 and h are approximate (~) on the page",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Elesa+Ganter",
   "title": "DIN 319 ball knobs datasheet (types C, E, K, L, M; KU / KT / ST / AL / NI): sample rows d1, d2, d3, d4, h, t1, t2",
   "url": "https://elesa-ganter.be/technicaldatasheet/DIN 319.pdf/en",
   "formats": [
    "web"
   ],
   "license": "Maker datasheet; used as a cross-check only (column alignment unclear in the text)",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Metric ball knobs (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/metric-ball-knobs/",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "Threaded ball knobs (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/threaded-ball-knobs",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "not-scanned",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "star-knobs-din-6336",
  "fixed-handles-din-39",
  "knurled-thumb-screws-din-464",
  "wing-nuts-din-315-asme-b18-17",
  "vintage-knob-set"
 ],
 "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": "thread d2",
   "exact": "M4 (Ø16), M5 (Ø20), M6 (Ø25), M8 (Ø32), M10 (Ø40), M12 (Ø50), minimum thread depth t1 / t2 per table",
   "mates": "stud or screw of the same metric thread",
   "fit": "designed",
   "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": "What thread does a 25 mm DIN 319 ball knob have?",
   "a": "M6 (form C or E), with d4 ≈ 15, h ≈ 22.5 and minimum thread depth 11 mm (form C) or 9 mm (form E) on Halder's page."
  },
  {
   "q": "What is the difference between form C and form E?",
   "a": "Form C has a thread moulded into the knob; form E has a threaded bush (Halder)."
  },
  {
   "q": "How tall is a Ø40 ball knob?",
   "a": "About 37 mm (h ≈ 37), with an M10 thread and d4 ≈ 22."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/ball-knobs-din-319/index.md"
}