{
 "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": "nylon-and-rubber-sealing-washers",
 "name": "Nylon washers and EPDM / neoprene flat sealing washers: M2–M12 sizes from two nylon makers, rubber washer sizes and what the standards say",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What size are nylon washers and EPDM or neoprene sealing washers for M4, M5, M6, M8, M10 and M12 screws?",
 "tags": [
  "nylon washer",
  "plastic washer",
  "polyamide washer",
  "EPDM washer",
  "rubber washer",
  "neoprene washer",
  "sealing washer",
  "rubber sealing washer",
  "insulating washer",
  "DIN 125 nylon"
 ],
 "aliases": [
  "m6 nylon washer dimensions",
  "m8 nylon washer outside diameter",
  "m5 nylon washer thickness",
  "epdm sealing washer m6",
  "m10 rubber washer size",
  "m4 rubber washer 9 mm",
  "nylon washer m12 24 mm",
  "m3 nylon washer od",
  "neoprene washer m8",
  "nylon washer thickness chart",
  "rubber sealing washer for screws",
  "plastic washer m5"
 ],
 "overall_mm": {
  "length": 24,
  "width": 24,
  "height": 2.5
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 8,
 "url": "https://xemstudio.com/objects/nylon-and-rubber-sealing-washers/",
 "sheet_txt": "https://xemstudio.com/objects/nylon-and-rubber-sealing-washers/sheet.txt",
 "sheet": {
  "basis": "Jetpress's DIN 125 nylon table, an RS Components nylon 6,6 datasheet and Aspen Fasteners' M12 sheet (nylon); Polymax's EPDM solid-washer list (rubber); mm; 8 envelope files for sizes where the makers agree",
  "overall_mm": {
   "length": 24,
   "width": 24,
   "height": 2.5
  },
  "notes": [
   "Nylon (polyamide) flat washers follow the DIN 125 form A pattern, but they are described by the makers as 'similar to' it (Westfield). The two tables read here agree for M2, M2.5, M4 and M12 and differ for M3 (OD 7 against 8 mm), M5 (10 against 11), M6 (12.5 × 1.6 against 12 × 1.5), M8 (17 × 1.6 against 18 × 2) and M10 (21 × 2 against 22 × 2.5). Both are shown; the files are drawn only where they agree. Aspen's M12 sheet (DIN 125 Type A / ISO 7089, nylon 6/6) matches 13 × 24 × 2.5 mm and prints the tolerances (ID 13 to 13.27, OD 23.48 to 24, T 2.3 to 2.7).",
   "Rubber sealing washers (EPDM, neoprene, silicone) are plain flat rings, and no ISO or DIN dimension standard for them was found. Polymax's EPDM list (black, 60 ShA) shows that the same label covers several sizes: 'M6' is 6.4 × 14, 6.4 × 12.5 or 6 × 22 mm, and 'M8' is 8 × 20, 8 × 24 or 8.5 × 17 mm, all 1.5 mm thick. Four of them are drawn (M4 4 × 9, M5 5.3 × 10, M6 6.4 × 12.5, M8 8.5 × 17) as examples; the label is the maker's. A neoprene flat-washer list (Superior Washer, inch sizes) was read, but it printed no screw size, no durometer and no units, so it is not used.",
   "Bonded (metal-and-rubber) sealing washers are a separate part: see iso-1179-bspp-ports-and-bonded-seals for the bonded seal sizes. McMaster-Carr lists EPDM and neoprene sealing washers for screw sizes No. 2 to 1-1/4 in and M3 to M30 (its filters; no per-part rows were read), with per-part STEP on its own site.",
   "Not tabled: neoprene or silicone sizes, shore hardness other than the 60 ShA Polymax lists, and FDA grades. Files are plain annuli at the printed ID, OD and thickness."
  ],
  "table": {
   "columns": [
    "washer",
    "size",
    "ID × OD × T (mm): Jetpress / Polymax",
    "ID × OD × T (mm): RS datasheet",
    "makers"
   ],
   "rows": [
    [
     "nylon flat washer",
     "M2",
     "2.2 × 5 × 0.3",
     "2.2 × 5 × 0.3",
     "agree"
    ],
    [
     "nylon flat washer",
     "M2.5",
     "2.7 × 6 × 0.5",
     "2.7 × 6 × 0.5",
     "agree"
    ],
    [
     "nylon flat washer",
     "M3",
     "3.2 × 7 × 0.5",
     "3.2 × 8 × 0.8",
     "differ"
    ],
    [
     "nylon flat washer",
     "M4",
     "4.3 × 9 × 0.8",
     "4.3 × 9 × 0.8",
     "agree"
    ],
    [
     "nylon flat washer",
     "M5",
     "5.3 × 10 × 1",
     "5.3 × 11 × 1",
     "differ"
    ],
    [
     "nylon flat washer",
     "M6",
     "6.4 × 12.5 × 1.6",
     "6.4 × 12 × 1.5",
     "differ"
    ],
    [
     "nylon flat washer",
     "M8",
     "8.4 × 17 × 1.6",
     "8.4 × 18 × 2",
     "differ"
    ],
    [
     "nylon flat washer",
     "M10",
     "10.5 × 21 × 2",
     "10.5 × 22 × 2.5",
     "differ"
    ],
    [
     "nylon flat washer",
     "M12",
     "13 × 24 × 2.5",
     "13 × 24 × 2.5",
     "agree"
    ],
    [
     "EPDM flat washer (Polymax)",
     "M4",
     "4 × 9 × 1.5",
     "–",
     "one maker"
    ],
    [
     "EPDM flat washer (Polymax)",
     "M5",
     "5.3 × 10 × 1.5",
     "–",
     "one maker"
    ],
    [
     "EPDM flat washer (Polymax)",
     "M6",
     "6.4 × 12.5 × 1.5",
     "–",
     "one maker"
    ],
    [
     "EPDM flat washer (Polymax)",
     "M8",
     "8.5 × 17 × 1.5",
     "–",
     "one maker"
    ],
    [
     "nylon M12 (Aspen, DIN 125A / ISO 7089)",
     "M12",
     "13 × 24 × 2.5; ID 13 to 13.27, OD 23.48 to 24, T 2.3 to 2.7",
     "–",
     "tolerances"
    ]
   ]
  }
 },
 "sheet_text": "Nylon washers and EPDM / neoprene flat sealing washers: M2–M12 sizes from two nylon makers, rubber washer sizes and what the standards say — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/nylon-and-rubber-sealing-washers/  (sheet CC BY 4.0)\nBasis: Jetpress's DIN 125 nylon table, an RS Components nylon 6,6 datasheet and Aspen Fasteners' M12 sheet (nylon); Polymax's EPDM solid-washer list (rubber); mm; 8 envelope files for sizes where the makers agree\nCatalog version: 2026-10-20\n\nOverall (mm): length 24.0, width 24.0, height 2.5\n- Nylon (polyamide) flat washers follow the DIN 125 form A pattern, but they are described by the makers as 'similar to' it (Westfield). The two tables read here agree for M2, M2.5, M4 and M12 and differ for M3 (OD 7 against 8 mm), M5 (10 against 11), M6 (12.5 × 1.6 against 12 × 1.5), M8 (17 × 1.6 against 18 × 2) and M10 (21 × 2 against 22 × 2.5). Both are shown; the files are drawn only where they agree. Aspen's M12 sheet (DIN 125 Type A / ISO 7089, nylon 6/6) matches 13 × 24 × 2.5 mm and prints the tolerances (ID 13 to 13.27, OD 23.48 to 24, T 2.3 to 2.7).\n- Rubber sealing washers (EPDM, neoprene, silicone) are plain flat rings, and no ISO or DIN dimension standard for them was found. Polymax's EPDM list (black, 60 ShA) shows that the same label covers several sizes: 'M6' is 6.4 × 14, 6.4 × 12.5 or 6 × 22 mm, and 'M8' is 8 × 20, 8 × 24 or 8.5 × 17 mm, all 1.5 mm thick. Four of them are drawn (M4 4 × 9, M5 5.3 × 10, M6 6.4 × 12.5, M8 8.5 × 17) as examples; the label is the maker's. A neoprene flat-washer list (Superior Washer, inch sizes) was read, but it printed no screw size, no durometer and no units, so it is not used.\n- Bonded (metal-and-rubber) sealing washers are a separate part: see iso-1179-bspp-ports-and-bonded-seals for the bonded seal sizes. McMaster-Carr lists EPDM and neoprene sealing washers for screw sizes No. 2 to 1-1/4 in and M3 to M30 (its filters; no per-part rows were read), with per-part STEP on its own site.\n- Not tabled: neoprene or silicone sizes, shore hardness other than the 60 ShA Polymax lists, and FDA grades. Files are plain annuli at the printed ID, OD and thickness.\n\nwasher  size  ID × OD × T (mm): Jetpress / Polymax  ID × OD × T (mm): RS datasheet  makers\nnylon flat washer  M2  2.2 × 5 × 0.3  2.2 × 5 × 0.3  agree\nnylon flat washer  M2.5  2.7 × 6 × 0.5  2.7 × 6 × 0.5  agree\nnylon flat washer  M3  3.2 × 7 × 0.5  3.2 × 8 × 0.8  differ\nnylon flat washer  M4  4.3 × 9 × 0.8  4.3 × 9 × 0.8  agree\nnylon flat washer  M5  5.3 × 10 × 1  5.3 × 11 × 1  differ\nnylon flat washer  M6  6.4 × 12.5 × 1.6  6.4 × 12 × 1.5  differ\nnylon flat washer  M8  8.4 × 17 × 1.6  8.4 × 18 × 2  differ\nnylon flat washer  M10  10.5 × 21 × 2  10.5 × 22 × 2.5  differ\nnylon flat washer  M12  13 × 24 × 2.5  13 × 24 × 2.5  agree\nEPDM flat washer (Polymax)  M4  4 × 9 × 1.5  –  one maker\nEPDM flat washer (Polymax)  M5  5.3 × 10 × 1.5  –  one maker\nEPDM flat washer (Polymax)  M6  6.4 × 12.5 × 1.5  –  one maker\nEPDM flat washer (Polymax)  M8  8.5 × 17 × 1.5  –  one maker\nnylon M12 (Aspen, DIN 125A / ISO 7089)  M12  13 × 24 × 2.5; ID 13 to 13.27, OD 23.48 to 24, T 2.3 to 2.7  –  tolerances\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Jetpress (maker): Nylon washer, standard, DIN 125: M2 to M20 ID (D1), OD (D2), thickness (T), mm — web — Publisher's page; dimensions are facts — https://www.jetpress.com/component-and-fastener-products/nylon-washer-standard-din-125/WAS162\n- RS Components (datasheet): Nylon 6,6 washers, natural: M2 to M12 I/D, O/D, thickness (standard not named on the sheet) — web — Publisher's page; dimensions are facts — https://assets.rs-online.com/v1678197688/Datasheets/5266a488e57b01381baaa7ce517eb610.pdf\n- Aspen Fasteners: M12 DIN 125 Type A / ISO 7089 nylon 6/6 washer: ID 13 (13 to 13.27), OD 24 (23.48 to 24), thickness 2.5 (2.3 to 2.7) — web — Publisher's page; dimensions are facts — https://www.aspenfasteners.com/m12-din-125-type-a-iso-7089-7090-metric-standard-flat-washers-nylon-6-6/\n- Polymax (maker), EPDM solid washers: EPDM solid washers, black, 60 ShA: ID x OD x thickness, as printed (no standard stated; 28 of 99 items read) — web — Publisher's page; dimensions are facts — https://m2dev.polymax.co.uk/en/seals/washers/solid-washers/epdm\n- McMaster-Carr: EPDM rubber sealing washers (screw sizes No. 2 to 1-1/4 in and M3 to M30 listed as filters; no per-part rows read) (free STEP 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/epdm-rubber-sealing-washers\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 8 parts): https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/index.json\nAPI: https://xemstudio.com/api/geometry?object=nylon-and-rubber-sealing-washers\n",
 "sources": [
  {
   "publisher": "Jetpress (maker)",
   "title": "Nylon washer, standard, DIN 125: M2 to M20 ID (D1), OD (D2), thickness (T), mm",
   "url": "https://www.jetpress.com/component-and-fastener-products/nylon-washer-standard-din-125/WAS162",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "RS Components (datasheet)",
   "title": "Nylon 6,6 washers, natural: M2 to M12 I/D, O/D, thickness (standard not named on the sheet)",
   "url": "https://assets.rs-online.com/v1678197688/Datasheets/5266a488e57b01381baaa7ce517eb610.pdf",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Aspen Fasteners",
   "title": "M12 DIN 125 Type A / ISO 7089 nylon 6/6 washer: ID 13 (13 to 13.27), OD 24 (23.48 to 24), thickness 2.5 (2.3 to 2.7)",
   "url": "https://www.aspenfasteners.com/m12-din-125-type-a-iso-7089-7090-metric-standard-flat-washers-nylon-6-6/",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Polymax (maker), EPDM solid washers",
   "title": "EPDM solid washers, black, 60 ShA: ID x OD x thickness, as printed (no standard stated; 28 of 99 items read)",
   "url": "https://m2dev.polymax.co.uk/en/seals/washers/solid-washers/epdm",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "McMaster-Carr",
   "title": "EPDM rubber sealing washers (screw sizes No. 2 to 1-1/4 in and M3 to M30 listed as filters; no per-part rows read) (free STEP per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/epdm-rubber-sealing-washers",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "flat-washers-metric",
  "flat-washers-metric-m10-m24",
  "large-washers-din-9021-iso-7093",
  "iso-1179-bspp-ports-and-bonded-seals",
  "nord-lock-wedge-locking-washers",
  "spring-lock-washers-din-127-b",
  "serrated-lock-washers-din-6798",
  "flat-washers-iso-7090-m5-m64"
 ],
 "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": "nylon: Ø2.2 (M2), 2.7 (M2.5), 4.3 (M4), 13 (M12) mm; EPDM: Ø4 (M4), 5.3 (M5), 6.4 (M6), 8.5 (M8) mm",
   "mates": "screw of the named size; nylon bores are the DIN 125 form A clearance values (flat-washers-metric)",
   "fit": "slide",
   "files": "nylon-washer-"
  },
  {
   "feature": "bore",
   "exact": "EPDM Ø4.0 / 5.3 / 6.4 / 8.5 mm",
   "mates": "screw of the labelled size; the washer is soft and seals by compression",
   "fit": "slide",
   "files": "epdm-washer-"
  }
 ],
 "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 is the OD of an M6 nylon washer?",
   "a": "12.5 mm × 1.6 mm thick in Jetpress's DIN 125 nylon table; 12 mm × 1.5 mm in an RS Components nylon 6,6 datasheet. The two makers differ."
  },
  {
   "q": "What size is an M12 nylon washer?",
   "a": "13 mm ID × 24 mm OD × 2.5 mm thick; both nylon tables read agree, and Aspen's sheet gives the tolerances."
  },
  {
   "q": "Is there a standard size for EPDM sealing washers?",
   "a": "No standard was found; makers list their own sizes. One maker's 1.5 mm EPDM washers labelled M6 come as 6.4 × 12.5 and 6.4 × 14 mm, among others."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "nylon-washer-m2",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/nylon-washer-m2.step",
   "stl": "https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/nylon-washer-m2.stl",
   "note": "nylon flat washer for M2: plain annulus Ø2.2 inside, Ø5 outside, 0.3 mm thick (Jetpress DIN 125 and RS datasheet agree)"
  },
  {
   "file": "nylon-washer-m2p5",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/nylon-washer-m2p5.step",
   "stl": "https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/nylon-washer-m2p5.stl",
   "note": "nylon flat washer for M2.5: plain annulus Ø2.7 inside, Ø6 outside, 0.5 mm thick (Jetpress DIN 125 and RS datasheet agree)"
  },
  {
   "file": "nylon-washer-m4",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/nylon-washer-m4.step",
   "stl": "https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/nylon-washer-m4.stl",
   "note": "nylon flat washer for M4: plain annulus Ø4.3 inside, Ø9 outside, 0.8 mm thick (Jetpress DIN 125 and RS datasheet agree)"
  },
  {
   "file": "nylon-washer-m12",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/nylon-washer-m12.step",
   "stl": "https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/nylon-washer-m12.stl",
   "note": "nylon flat washer for M12: plain annulus Ø13 inside, Ø24 outside, 2.5 mm thick (Jetpress DIN 125 and RS datasheet agree)"
  },
  {
   "file": "epdm-washer-m4-4p0x9p0",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
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   "stl": "https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/epdm-washer-m4-4p0x9p0.stl",
   "note": "EPDM flat sealing washer labelled M4 by the maker: plain annulus Ø4 inside, Ø9 outside, 1.5 mm thick (Polymax listing; no standard exists for these sizes)"
  },
  {
   "file": "epdm-washer-m5-5p3x10p0",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/epdm-washer-m5-5p3x10p0.step",
   "stl": "https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/epdm-washer-m5-5p3x10p0.stl",
   "note": "EPDM flat sealing washer labelled M5 by the maker: plain annulus Ø5.3 inside, Ø10 outside, 1.5 mm thick (Polymax listing; no standard exists for these sizes)"
  },
  {
   "file": "epdm-washer-m6-6p4x12p5",
   "formats": [
    "step",
    "stl"
   ],
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   "stl": "https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/epdm-washer-m6-6p4x12p5.stl",
   "note": "EPDM flat sealing washer labelled M6 by the maker: plain annulus Ø6.4 inside, Ø12.5 outside, 1.5 mm thick (Polymax listing; no standard exists for these sizes)"
  },
  {
   "file": "epdm-washer-m8-8p5x17p0",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/epdm-washer-m8-8p5x17p0.step",
   "stl": "https://xemstudio.com/files/hardware/nylon-and-rubber-sealing-washers/epdm-washer-m8-8p5x17p0.stl",
   "note": "EPDM flat sealing washer labelled M8 by the maker: plain annulus Ø8.5 inside, Ø17 outside, 1.5 mm thick (Polymax listing; no standard exists for these sizes)"
  }
 ],
 "markdown": "https://xemstudio.com/objects/nylon-and-rubber-sealing-washers/index.md"
}