{
 "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-transfer-units",
 "name": "Ball transfer units: Alwayse Euro units 515 / 522 / 530 / 545 and 3000 flange unit, Omnitrack series: ball size, body, height, seating hole, fixing",
 "kind": "standard",
 "category": "Hardware",
 "group": "Bearings, rails & motion",
 "year": null,
 "question": "What are the dimensions of a ball transfer unit (ball roller): ball diameter, body diameter, height, seating hole or flange hole spacing, and stud thread?",
 "tags": [
  "ball transfer unit",
  "ball transfer",
  "ball roller",
  "ball caster",
  "alwayse",
  "omnitrack",
  "ball table",
  "conveyor"
 ],
 "aliases": [
  "ball transfer unit dimensions",
  "ball transfer unit 15.8 mm",
  "ball transfer 22 mm",
  "alwayse 515",
  "alwayse 522",
  "alwayse ball transfer",
  "omnitrack ball transfer",
  "ball roller dimensions",
  "ball transfer unit hole size",
  "ball transfer unit seating hole",
  "ball transfer flange mounting holes",
  "ball transfer table ball size",
  "ball transfer unit stud thread",
  "omnitrack 91 series"
 ],
 "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-transfer-units/",
 "sheet_txt": "https://xemstudio.com/objects/ball-transfer-units/sheet.txt",
 "sheet": {
  "basis": "Alwayse's catalogue and maker data pages (tuli-shop, RS), Omnitrack's GlobalSpec series pages; rows with only one source are marked",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Ball transfer units (ball rollers, ball casters, ball transfers, 'ball bearing tables') are a captive large ball on a bed of small balls in a housing, used to build omnidirectional load tables. They come in three mounting families: clip-in (Alwayse Euro units: the unit drops into a plain hole in the table and a 3-prong clip fixes it from the top face), flange (screws through two or four holes) and threaded stud. B is the height of the ball top above the mounting plane, C how far the ball stands out of the outer ring, A the largest diameter (the flange).",
   "Where the numbers come from and how far they can be trusted: the Alwayse catalogue (Euro units table) was read with a scrambled text extraction, so only rows whose columns could be matched to the maker's own product pages are shown: for 515-2 (ball 15.8: D 24, B 9.5, L 21, A 31, F 2.8, C 3.2, seating hole 25.0 to 25.5 for a 2 mm table, 60 kg) and 522-0 (ball 22.2: D 36, B 9.8, L 30, A 45, F 2.8, C 4.3, 160 kg) the catalogue row and the tuli-shop data page agree. The 530-0 and 545-0 rows are the catalogue's only (column order checked on 515 and 522, so the same order is read here); their loads and seating holes are not shown. The catalogue's load for 522-0 read 100 kg in the scrambled text; tuli-shop and RS both give 160 kg, which is used.",
   "Omnitrack's per-model data (ball, body, height, hole pattern) is behind a sign-in on the sources read; GlobalSpec's series pages give only ranges (ball 12.7 to 102 mm, body 23.8 to 228 mm, square flanges of 1-3/4, 2-1/4, 3, 5 and 7 in, fixing centres 'on request', load 100 to 10,000 lb). No hole spacing is claimed for Omnitrack. For a hole pattern from a published source use the Alwayse 3000: two holes Ø5.1 mm on 44.5 mm centres.",
   "Left out: Alwayse mini (11MI), thread, tube, base fixing, heavy duty 800, Hi-Tech, spring loaded and die lifter series (catalogue tables not readable), other makers' units, and the interior (inner race, balls, seals), which no source gives as numbers. No file: the ball position inside the housing and the outer ring profile are not published, so a solid would be guessed."
  ],
  "table": {
   "columns": [
    "unit",
    "ball Ø, mm",
    "body Ø D, mm",
    "max Ø A, mm",
    "overall length L, mm",
    "ball working height B, mm",
    "ball exposure above outer ring C, mm",
    "flange thickness F, mm",
    "under flange to base E, mm",
    "fixing",
    "max load, kg",
    "source"
   ],
   "rows": [
    [
     "Alwayse 515-2 (type 16), Euro unit",
     "15.8",
     "24",
     "31",
     "21",
     "9.5",
     "3.2",
     "2.8",
     "11.5",
     "clip, seating hole Ø25.0 to 25.5 in a table 2 mm thick",
     "60",
     "Alwayse data via tuli-shop; catalogue 515-0 row has the same numbers"
    ],
    [
     "Alwayse 522-0 (type 13), Euro unit",
     "22.2",
     "36",
     "45",
     "30",
     "9.8",
     "4.3",
     "2.8",
     "—",
     "3-prong clip; RS: seating hole Ø37 to 37.5 in a 3 mm table",
     "160",
     "tuli-shop + RS; catalogue row agrees"
    ],
    [
     "Alwayse 530-0 (type 13), Euro unit",
     "30",
     "45",
     "55",
     "37",
     "13.8",
     "5.5",
     "4",
     "—",
     "clip (CL14-30 in the catalogue)",
     "—",
     "catalogue row only"
    ],
    [
     "Alwayse 545-0 (type 13), Euro unit",
     "44.5",
     "62",
     "75",
     "53.5",
     "19",
     "9",
     "4",
     "—",
     "clip (CL14-45 in the catalogue)",
     "—",
     "catalogue row only"
    ],
    [
     "Alwayse 3000 (type 14), flange unit",
     "19",
     "29.1",
     "61",
     "—",
     "10",
     "3.2",
     "3.2",
     "12",
     "2 flange holes Ø5.1 on 44.5 centres; seating hole Ø30",
     "20 up / 10 down",
     "tuli-shop (Alwayse data)"
    ],
    [
     "Omnitrack 91 series (threaded stud)",
     "12.7 – 76.2",
     "19.99 – 160",
     "—",
     "—",
     "—",
     "—",
     "—",
     "—",
     "stud 5/16, 1/2, 3/4, 1 in UNF or ISO metric",
     "45 – 4535 (100 – 10,000 lb)",
     "series ranges only"
    ],
    [
     "Omnitrack 92 series (flange mounted)",
     "12.7 – 102",
     "23.83 – 228",
     "—",
     "—",
     "—",
     "—",
     "—",
     "—",
     "square flange 1-3/4, 2-1/4, 3, 5, 7 in (2 or 4 holes; models 9200 / 9210 round / oval, 2 holes)",
     "45 – 4535",
     "series ranges only"
    ],
    [
     "Omnitrack 93 series (flange socket)",
     "12.7 – 76.2",
     "23.8 – 160",
     "—",
     "—",
     "—",
     "—",
     "—",
     "—",
     "square flange 1-3/4 to 7 in; models 9300 round, 9310 oval (2 holes)",
     "45 – 4535",
     "series ranges only"
    ]
   ]
  }
 },
 "sheet_text": "Ball transfer units: Alwayse Euro units 515 / 522 / 530 / 545 and 3000 flange unit, Omnitrack series: ball size, body, height, seating hole, fixing — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/ball-transfer-units/  (sheet CC BY 4.0)\nBasis: Alwayse's catalogue and maker data pages (tuli-shop, RS), Omnitrack's GlobalSpec series pages; rows with only one source are marked\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Ball transfer units (ball rollers, ball casters, ball transfers, 'ball bearing tables') are a captive large ball on a bed of small balls in a housing, used to build omnidirectional load tables. They come in three mounting families: clip-in (Alwayse Euro units: the unit drops into a plain hole in the table and a 3-prong clip fixes it from the top face), flange (screws through two or four holes) and threaded stud. B is the height of the ball top above the mounting plane, C how far the ball stands out of the outer ring, A the largest diameter (the flange).\n- Where the numbers come from and how far they can be trusted: the Alwayse catalogue (Euro units table) was read with a scrambled text extraction, so only rows whose columns could be matched to the maker's own product pages are shown: for 515-2 (ball 15.8: D 24, B 9.5, L 21, A 31, F 2.8, C 3.2, seating hole 25.0 to 25.5 for a 2 mm table, 60 kg) and 522-0 (ball 22.2: D 36, B 9.8, L 30, A 45, F 2.8, C 4.3, 160 kg) the catalogue row and the tuli-shop data page agree. The 530-0 and 545-0 rows are the catalogue's only (column order checked on 515 and 522, so the same order is read here); their loads and seating holes are not shown. The catalogue's load for 522-0 read 100 kg in the scrambled text; tuli-shop and RS both give 160 kg, which is used.\n- Omnitrack's per-model data (ball, body, height, hole pattern) is behind a sign-in on the sources read; GlobalSpec's series pages give only ranges (ball 12.7 to 102 mm, body 23.8 to 228 mm, square flanges of 1-3/4, 2-1/4, 3, 5 and 7 in, fixing centres 'on request', load 100 to 10,000 lb). No hole spacing is claimed for Omnitrack. For a hole pattern from a published source use the Alwayse 3000: two holes Ø5.1 mm on 44.5 mm centres.\n- Left out: Alwayse mini (11MI), thread, tube, base fixing, heavy duty 800, Hi-Tech, spring loaded and die lifter series (catalogue tables not readable), other makers' units, and the interior (inner race, balls, seals), which no source gives as numbers. No file: the ball position inside the housing and the outer ring profile are not published, so a solid would be guessed.\n\nunit  ball Ø, mm  body Ø D, mm  max Ø A, mm  overall length L, mm  ball working height B, mm  ball exposure above outer ring C, mm  flange thickness F, mm  under flange to base E, mm  fixing  max load, kg  source\nAlwayse 515-2 (type 16), Euro unit  15.8  24  31  21  9.5  3.2  2.8  11.5  clip, seating hole Ø25.0 to 25.5 in a table 2 mm thick  60  Alwayse data via tuli-shop; catalogue 515-0 row has the same numbers\nAlwayse 522-0 (type 13), Euro unit  22.2  36  45  30  9.8  4.3  2.8  —  3-prong clip; RS: seating hole Ø37 to 37.5 in a 3 mm table  160  tuli-shop + RS; catalogue row agrees\nAlwayse 530-0 (type 13), Euro unit  30  45  55  37  13.8  5.5  4  —  clip (CL14-30 in the catalogue)  —  catalogue row only\nAlwayse 545-0 (type 13), Euro unit  44.5  62  75  53.5  19  9  4  —  clip (CL14-45 in the catalogue)  —  catalogue row only\nAlwayse 3000 (type 14), flange unit  19  29.1  61  —  10  3.2  3.2  12  2 flange holes Ø5.1 on 44.5 centres; seating hole Ø30  20 up / 10 down  tuli-shop (Alwayse data)\nOmnitrack 91 series (threaded stud)  12.7 – 76.2  19.99 – 160  —  —  —  —  —  —  stud 5/16, 1/2, 3/4, 1 in UNF or ISO metric  45 – 4535 (100 – 10,000 lb)  series ranges only\nOmnitrack 92 series (flange mounted)  12.7 – 102  23.83 – 228  —  —  —  —  —  —  square flange 1-3/4, 2-1/4, 3, 5, 7 in (2 or 4 holes; models 9200 / 9210 round / oval, 2 holes)  45 – 4535  series ranges only\nOmnitrack 93 series (flange socket)  12.7 – 76.2  23.8 – 160  —  —  —  —  —  —  square flange 1-3/4 to 7 in; models 9300 round, 9310 oval (2 holes)  45 – 4535  series ranges only\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Alwayse Engineering (catalogue PDF, loziska-policka.cz copy): Ball transfer units catalogue: Euro units type 13 (515 / 522 / 530 / 545), flange, thread, tube and base fixings — web — Maker catalogue; numbers only. Text extraction partly scrambled — https://www.loziska-policka.cz/user/documents/upload/ALWAYSE - Ball Tranfer Units.pdf\n- tuli-shop (Alwayse data): Alwayse 515-2 type 16: ball 15.8, D 24, B 9.5, L 21, A 31, F 2.8, E 11.5, C 3.2, seating hole 25.0 to 25.5, 60 kg — web — Publisher's page; dimensions are facts — https://www.tuli-shop.com/alwayse-ball-transfer-unit-515-2-16\n- tuli-shop (Alwayse data): Alwayse 522-0 type 13: ball 22.2, D 36, B 9.8, L 30, A 45, F 2.8, C 4.3, 160 kg — web — Publisher's page; dimensions are facts — https://www.tuli-shop.com/us/alwayse-ball-transfer-unit-522-0-13\n- tuli-shop (Alwayse data): Alwayse 3000 type 14 flange unit: ball 19, D 29.1, A 61, B 10, E 12, C 3.2, F 3.2, 2 holes on 44.5 centres, hole Ø5.1, seating hole 30 — web — Publisher's page; dimensions are facts — https://www.tuli-shop.com/us/alwayse-ball-transfer-unit-3000-14\n- RS Components: Alwayse 522213 (22.2 ball): 3-prong clip, suggested seating hole Ø37 to 37.5 for a 3 mm table, 160 kg — web — Publisher's page; dimensions are facts — https://uk.rs-online.com/web/p/ball-transfer-units/2006368\n- Omnitrack (GlobalSpec): 91 series threaded stud ball transfer units: series ranges for ball, body, stud threads (per-model data gated) — web — Publisher's page; dimensions are facts — https://datasheets.globalspec.com/ds/omnitrack/91-series/90a15af7-ea0d-4199-8fac-82aa182d569d\n- Omnitrack (GlobalSpec): 92 series flange mounted heavy duty units: ball 12.7 to 102 mm, square flanges 1-3/4 to 7 in — web — Publisher's page; dimensions are facts — https://datasheets.globalspec.com/ds/omnitrack/92-series/e491017f-043f-4100-99fe-15c58b6e8a06\n- Omnitrack (GlobalSpec): 93 series flange socket units: ball 12.7 to 76.2 mm, square flanges 1-3/4 to 7 in — web — Publisher's page; dimensions are facts — https://datasheets.globalspec.com/ds/omnitrack/93-series/2ad37c64-c4b9-4e1a-9bc9-4bd8e908605e\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-transfer-units\n",
 "sources": [
  {
   "publisher": "Alwayse Engineering (catalogue PDF, loziska-policka.cz copy)",
   "title": "Ball transfer units catalogue: Euro units type 13 (515 / 522 / 530 / 545), flange, thread, tube and base fixings",
   "url": "https://www.loziska-policka.cz/user/documents/upload/ALWAYSE - Ball Tranfer Units.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker catalogue; numbers only. Text extraction partly scrambled",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "tuli-shop (Alwayse data)",
   "title": "Alwayse 515-2 type 16: ball 15.8, D 24, B 9.5, L 21, A 31, F 2.8, E 11.5, C 3.2, seating hole 25.0 to 25.5, 60 kg",
   "url": "https://www.tuli-shop.com/alwayse-ball-transfer-unit-515-2-16",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "tuli-shop (Alwayse data)",
   "title": "Alwayse 522-0 type 13: ball 22.2, D 36, B 9.8, L 30, A 45, F 2.8, C 4.3, 160 kg",
   "url": "https://www.tuli-shop.com/us/alwayse-ball-transfer-unit-522-0-13",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "tuli-shop (Alwayse data)",
   "title": "Alwayse 3000 type 14 flange unit: ball 19, D 29.1, A 61, B 10, E 12, C 3.2, F 3.2, 2 holes on 44.5 centres, hole Ø5.1, seating hole 30",
   "url": "https://www.tuli-shop.com/us/alwayse-ball-transfer-unit-3000-14",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "RS Components",
   "title": "Alwayse 522213 (22.2 ball): 3-prong clip, suggested seating hole Ø37 to 37.5 for a 3 mm table, 160 kg",
   "url": "https://uk.rs-online.com/web/p/ball-transfer-units/2006368",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Omnitrack (GlobalSpec)",
   "title": "91 series threaded stud ball transfer units: series ranges for ball, body, stud threads (per-model data gated)",
   "url": "https://datasheets.globalspec.com/ds/omnitrack/91-series/90a15af7-ea0d-4199-8fac-82aa182d569d",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Omnitrack (GlobalSpec)",
   "title": "92 series flange mounted heavy duty units: ball 12.7 to 102 mm, square flanges 1-3/4 to 7 in",
   "url": "https://datasheets.globalspec.com/ds/omnitrack/92-series/e491017f-043f-4100-99fe-15c58b6e8a06",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Omnitrack (GlobalSpec)",
   "title": "93 series flange socket units: ball 12.7 to 76.2 mm, square flanges 1-3/4 to 7 in",
   "url": "https://datasheets.globalspec.com/ds/omnitrack/93-series/2ad37c64-c4b9-4e1a-9bc9-4bd8e908605e",
   "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": [
  "caster",
  "caster-top-plate-patterns",
  "t-slot-gravity-roller-conveyor",
  "caster-stems-threaded-grip-ring",
  "rubber-buffers-gn-351-gn-451",
  "leveling-feet-gn-343-and-mcmaster"
 ],
 "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": "seating hole (Euro clip units)",
   "exact": "Ø25.0 to 25.5 for the 515-2 (body Ø24); Ø37 to 37.5 for the 522 (body Ø36), per RS",
   "mates": "a plain hole in a table 2 to 3 mm thick, clip-in from the top",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "flange holes (Alwayse 3000)",
   "exact": "2 × Ø5.1 on 44.5 mm centres; seating hole Ø30",
   "mates": "two screws through the flange; a Ø30 hole for the housing",
   "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 size hole does a 15.8 mm ball transfer unit need?",
   "a": "Alwayse 515-2 (ball 15.8, body Ø24): a seating hole Ø25.0 to 25.5 in a 2 mm table."
  },
  {
   "q": "What is the flange hole spacing of an Alwayse 3000 ball transfer?",
   "a": "Two holes Ø5.1 mm on 44.5 mm centres, flange Ø61 × 3.2, ball Ø19."
  },
  {
   "q": "Do Omnitrack ball transfer units have a standard hole pattern?",
   "a": "Their flange units have square flanges of 1-3/4, 2-1/4, 3, 5 and 7 in; the per-model hole centres are not in the public data read (and 'alternative fixing centres' are offered on request)."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/ball-transfer-units/index.md"
}