{
 "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": "shim-rings-din-988",
 "name": "Shim rings, DIN 988: 3×6 to 50×63 bore and outside diameter, standard thicknesses",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What bore and outside diameter sizes and thicknesses does a DIN 988 shim ring come in?",
 "tags": [
  "din 988",
  "shim ring",
  "shim washer",
  "spacer ring",
  "axial shim",
  "bearing shim"
 ],
 "aliases": [
  "din 988 sizes",
  "shim washer 10x16",
  "12x18 shim ring",
  "din 988 thicknesses",
  "shaft shim 20 mm"
 ],
 "overall_mm": {
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  "width": null,
  "height": null
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  "basis": "Westfield Fasteners' DIN 988 tables (nominal d1/d2 and standard thicknesses), cross-checked against Würth and Böllhoff DIN 988 listings (e.g. 12×18, 60×75)",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "Columns: bore d1, outside diameter d2. Standard thicknesses: 0.1, 0.15, 0.2, 0.3, 0.5, 1.0, 1.1 to 2.0 in 0.1 steps.",
   "Files drawn at s = 1.0 for every bore up to 50 mm; other thicknesses change s only. Larger sizes (52×65 to 170×200) are in the standard but not drawn here."
  ],
  "table": {
   "columns": [
    "d1",
    "d2"
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 "sheet_text": "Shim rings, DIN 988: 3×6 to 50×63 bore and outside diameter, standard thicknesses — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/shim-rings-din-988/  (sheet CC BY 4.0)\nBasis: Westfield Fasteners' DIN 988 tables (nominal d1/d2 and standard thicknesses), cross-checked against Würth and Böllhoff DIN 988 listings (e.g. 12×18, 60×75)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Columns: bore d1, outside diameter d2. Standard thicknesses: 0.1, 0.15, 0.2, 0.3, 0.5, 1.0, 1.1 to 2.0 in 0.1 steps.\n- Files drawn at s = 1.0 for every bore up to 50 mm; other thicknesses change s only. Larger sizes (52×65 to 170×200) are in the standard but not drawn here.\n\nd1  d2\n3  6\n4  8\n5  10\n6  12\n7  13\n8  14\n9  15\n10  16\n11  17\n12  18\n13  19\n14  20\n15  21\n16  22\n17  24\n18  25\n19  26\n20  28\n22  30\n22  32\n25  35\n25  36\n26  37\n28  40\n30  42\n32  45\n35  45\n36  45\n37  47\n40  50\n42  52\n45  55\n45  56\n48  60\n50  62\n50  63\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Westfield Fasteners: DIN 988 shim washers: nominal d1/d2 and standard thicknesses — web — Publisher's page; dimensions are facts — https://www.westfieldfasteners.co.uk/Standards/Washer-ShimDIN988-M.html\n- Böllhoff: DIN 988 shim rings, steel, data sheet — web — Publisher's page; dimensions are facts — https://eshop-hu.boellhoff.com/out/media/pdf/DIN_988_Stahl___en.pdf\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 36 parts): https://xemstudio.com/files/hardware/shim-rings-din-988/index.json\nAPI: https://xemstudio.com/api/geometry?object=shim-rings-din-988\n",
 "sources": [
  {
   "publisher": "Westfield Fasteners",
   "title": "DIN 988 shim washers: nominal d1/d2 and standard thicknesses",
   "url": "https://www.westfieldfasteners.co.uk/Standards/Washer-ShimDIN988-M.html",
   "formats": [
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   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
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  {
   "publisher": "Böllhoff",
   "title": "DIN 988 shim rings, steel, data sheet",
   "url": "https://eshop-hu.boellhoff.com/out/media/pdf/DIN_988_Stahl___en.pdf",
   "formats": [
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 "related": [
  "retaining-rings-din-471-external",
  "608-bearing",
  "flat-washers-metric"
 ],
 "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": "bore",
   "exact": "d1: 3 to 50",
   "mates": "shaft of nominal d1",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "outside",
   "exact": "d2: 6 to 63; 12 × 18",
   "mates": "housing shoulder or bearing face",
   "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 thicknesses do DIN 988 shims come in?",
   "a": "0.1, 0.15, 0.2, 0.3, 0.5 and 1.0 mm, then 1.1 to 2.0 mm in 0.1 mm steps."
  },
  {
   "q": "What is the outside diameter of a 12 mm shim ring?",
   "a": "DIN 988 12 × 18: 12 mm bore, 18 mm outside."
  }
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