{
 "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": "o-ring-cord-stock-sizes",
 "name": "O-ring cord stock sizes: 0.070 to 0.500 in and 1.5 to 8.4 mm diameters (round), AS568 series cross-reference",
 "kind": "standard",
 "category": "Hardware",
 "group": "Bearings, rails & motion",
 "year": null,
 "question": "What diameters does O-ring cord stock come in, and which AS568 O-ring series does each match?",
 "tags": [
  "o-ring cord",
  "cord stock",
  "oring cord",
  "round cord",
  "as568",
  "seal",
  "splice o-ring",
  "cord diameter",
  "tool"
 ],
 "aliases": [
  "o-ring cord stock sizes",
  "o ring cord diameter chart",
  "0.139 cord stock",
  "3.53 mm o-ring cord",
  "o-ring cord 5 mm",
  "viton cord stock sizes",
  "buna-n cord stock diameter",
  "o ring cord metric sizes",
  "cord stock for as568 -2xx",
  "1/4 o-ring cord stock",
  "o-ring cord 2.4 mm"
 ],
 "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/o-ring-cord-stock-sizes/",
 "sheet_txt": "https://xemstudio.com/objects/o-ring-cord-stock-sizes/sheet.txt",
 "sheet": {
  "basis": "McMaster-Carr's printed cord stock width list (inch and metric) and Marco Rubber's cord ranges; the AS568 cross-sections are from as568-o-rings. Numbers only",
  "overall_mm": {
   "length": null,
   "width": null,
   "height": null
  },
  "notes": [
   "McMaster-Carr's cord stock page lists these 'For Cord Stock Width' diameters: inch 0.07, 0.103, 0.139, 0.21, 0.275, 0.312, 0.313, 0.375, 0.5 and metric 1.5, 1.6, 2, 2.4, 2.5, 3, 3.5, 4, 5, 5.7, 8.4 mm. 0.312 and 0.313 are both printed, and the page does not say which diameters come in which materials. The inch values 0.070 / 0.103 / 0.139 / 0.210 / 0.275 in are the five AS568 cross-section series (-0xx to -4xx); the mm conversions are inch x 25.4.",
   "Marco Rubber's page gives ranges only: round cord from 0.039 to 2.000 in, square from 0.099 to 1.000 in, 4-lobed X-ring cord from 0.103 to 1.000 in, in durometers 40 to 90. It prints no step list, tolerances or lengths.",
   "Tolerances, standard lengths and colours were not printed in the sources read, so none are given. For a ring cut and spliced from cord the cross-section you need is the one in the groove tables: oring-gland-static-radial-as568, oring-gland-dynamic-reciprocating-as568 (inch) and oring-grooves-metric (mm cross-sections 1.0 to 5.7).",
   "No file: cord is a plain cylinder of the stated diameter and any length, so it is not drawn. McMaster-Carr sells cord stock by the foot; its category page is linked, not copied."
  ],
  "table": {
   "columns": [
    "system",
    "diameter",
    "mm",
    "source",
    "AS568 series / note"
   ],
   "rows": [
    [
     "inch",
     "0.070 in",
     "1.78",
     "McMaster-Carr cord stock width list",
     "AS568 -0xx series (CS 1.78 mm per the as568 page)"
    ],
    [
     "inch",
     "0.103 in",
     "2.62",
     "McMaster-Carr cord stock width list",
     "AS568 -1xx series (CS 2.62 mm per the as568 page)"
    ],
    [
     "inch",
     "0.139 in",
     "3.53",
     "McMaster-Carr cord stock width list",
     "AS568 -2xx series (CS 3.53 mm per the as568 page)"
    ],
    [
     "inch",
     "0.210 in",
     "5.33",
     "McMaster-Carr cord stock width list",
     "AS568 -3xx series (CS 5.33 mm per the as568 page)"
    ],
    [
     "inch",
     "0.275 in",
     "6.99",
     "McMaster-Carr cord stock width list",
     "AS568 -4xx series (CS 6.99 mm per the as568 page)"
    ],
    [
     "inch",
     "0.312 in",
     "7.92",
     "McMaster-Carr cord stock width list",
     "not an AS568 cross-section"
    ],
    [
     "inch",
     "0.313 in",
     "7.95",
     "McMaster-Carr cord stock width list",
     "not an AS568 cross-section"
    ],
    [
     "inch",
     "0.375 in",
     "9.52",
     "McMaster-Carr cord stock width list",
     "not an AS568 cross-section"
    ],
    [
     "inch",
     "0.500 in",
     "12.70",
     "McMaster-Carr cord stock width list",
     "not an AS568 cross-section"
    ],
    [
     "metric",
     "1.5 mm",
     "1.5",
     "McMaster-Carr cord stock width list",
     "not an AS568 cross-section"
    ],
    [
     "metric",
     "1.6 mm",
     "1.6",
     "McMaster-Carr cord stock width list",
     "not an AS568 cross-section"
    ],
    [
     "metric",
     "2 mm",
     "2",
     "McMaster-Carr cord stock width list",
     "not an AS568 cross-section"
    ],
    [
     "metric",
     "2.4 mm",
     "2.4",
     "McMaster-Carr cord stock width list",
     "not an AS568 cross-section"
    ],
    [
     "metric",
     "2.5 mm",
     "2.5",
     "McMaster-Carr cord stock width list",
     "not an AS568 cross-section"
    ],
    [
     "metric",
     "3 mm",
     "3",
     "McMaster-Carr cord stock width list",
     "not an AS568 cross-section"
    ],
    [
     "metric",
     "3.5 mm",
     "3.5",
     "McMaster-Carr cord stock width list",
     "not an AS568 cross-section"
    ],
    [
     "metric",
     "4 mm",
     "4",
     "McMaster-Carr cord stock width list",
     "not an AS568 cross-section"
    ],
    [
     "metric",
     "5 mm",
     "5",
     "McMaster-Carr cord stock width list",
     "not an AS568 cross-section"
    ],
    [
     "metric",
     "5.7 mm",
     "5.7",
     "McMaster-Carr cord stock width list",
     "not an AS568 cross-section"
    ],
    [
     "metric",
     "8.4 mm",
     "8.4",
     "McMaster-Carr cord stock width list",
     "not an AS568 cross-section"
    ],
    [
     "inch (range)",
     "round 0.039 to 2.000 in",
     "0.99 to 50.80",
     "Marco Rubber cord page",
     "range as printed; no list of steps"
    ],
    [
     "inch (range)",
     "square 0.099 to 1.000 in",
     "2.51 to 25.40",
     "Marco Rubber cord page",
     "square cross-section"
    ],
    [
     "inch (range)",
     "4-lobed X-ring cord 0.103 to 1.000 in",
     "2.62 to 25.40",
     "Marco Rubber cord page",
     "quad-ring / X-ring profile"
    ]
   ]
  }
 },
 "sheet_text": "O-ring cord stock sizes: 0.070 to 0.500 in and 1.5 to 8.4 mm diameters (round), AS568 series cross-reference — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/o-ring-cord-stock-sizes/  (sheet CC BY 4.0)\nBasis: McMaster-Carr's printed cord stock width list (inch and metric) and Marco Rubber's cord ranges; the AS568 cross-sections are from as568-o-rings. Numbers only\nCatalog version: 2026-10-20\n\nSizes: see table below\n- McMaster-Carr's cord stock page lists these 'For Cord Stock Width' diameters: inch 0.07, 0.103, 0.139, 0.21, 0.275, 0.312, 0.313, 0.375, 0.5 and metric 1.5, 1.6, 2, 2.4, 2.5, 3, 3.5, 4, 5, 5.7, 8.4 mm. 0.312 and 0.313 are both printed, and the page does not say which diameters come in which materials. The inch values 0.070 / 0.103 / 0.139 / 0.210 / 0.275 in are the five AS568 cross-section series (-0xx to -4xx); the mm conversions are inch x 25.4.\n- Marco Rubber's page gives ranges only: round cord from 0.039 to 2.000 in, square from 0.099 to 1.000 in, 4-lobed X-ring cord from 0.103 to 1.000 in, in durometers 40 to 90. It prints no step list, tolerances or lengths.\n- Tolerances, standard lengths and colours were not printed in the sources read, so none are given. For a ring cut and spliced from cord the cross-section you need is the one in the groove tables: oring-gland-static-radial-as568, oring-gland-dynamic-reciprocating-as568 (inch) and oring-grooves-metric (mm cross-sections 1.0 to 5.7).\n- No file: cord is a plain cylinder of the stated diameter and any length, so it is not drawn. McMaster-Carr sells cord stock by the foot; its category page is linked, not copied.\n\nsystem  diameter  mm  source  AS568 series / note\ninch  0.070 in  1.78  McMaster-Carr cord stock width list  AS568 -0xx series (CS 1.78 mm per the as568 page)\ninch  0.103 in  2.62  McMaster-Carr cord stock width list  AS568 -1xx series (CS 2.62 mm per the as568 page)\ninch  0.139 in  3.53  McMaster-Carr cord stock width list  AS568 -2xx series (CS 3.53 mm per the as568 page)\ninch  0.210 in  5.33  McMaster-Carr cord stock width list  AS568 -3xx series (CS 5.33 mm per the as568 page)\ninch  0.275 in  6.99  McMaster-Carr cord stock width list  AS568 -4xx series (CS 6.99 mm per the as568 page)\ninch  0.312 in  7.92  McMaster-Carr cord stock width list  not an AS568 cross-section\ninch  0.313 in  7.95  McMaster-Carr cord stock width list  not an AS568 cross-section\ninch  0.375 in  9.52  McMaster-Carr cord stock width list  not an AS568 cross-section\ninch  0.500 in  12.70  McMaster-Carr cord stock width list  not an AS568 cross-section\nmetric  1.5 mm  1.5  McMaster-Carr cord stock width list  not an AS568 cross-section\nmetric  1.6 mm  1.6  McMaster-Carr cord stock width list  not an AS568 cross-section\nmetric  2 mm  2  McMaster-Carr cord stock width list  not an AS568 cross-section\nmetric  2.4 mm  2.4  McMaster-Carr cord stock width list  not an AS568 cross-section\nmetric  2.5 mm  2.5  McMaster-Carr cord stock width list  not an AS568 cross-section\nmetric  3 mm  3  McMaster-Carr cord stock width list  not an AS568 cross-section\nmetric  3.5 mm  3.5  McMaster-Carr cord stock width list  not an AS568 cross-section\nmetric  4 mm  4  McMaster-Carr cord stock width list  not an AS568 cross-section\nmetric  5 mm  5  McMaster-Carr cord stock width list  not an AS568 cross-section\nmetric  5.7 mm  5.7  McMaster-Carr cord stock width list  not an AS568 cross-section\nmetric  8.4 mm  8.4  McMaster-Carr cord stock width list  not an AS568 cross-section\ninch (range)  round 0.039 to 2.000 in  0.99 to 50.80  Marco Rubber cord page  range as printed; no list of steps\ninch (range)  square 0.099 to 1.000 in  2.51 to 25.40  Marco Rubber cord page  square cross-section\ninch (range)  4-lobed X-ring cord 0.103 to 1.000 in  2.62 to 25.40  Marco Rubber cord page  quad-ring / X-ring profile\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- McMaster-Carr: O-ring cord stock (for cord width filter: inch and metric diameters as listed) (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/o-ring-stock\n- Marco Rubber & Plastics: O-ring cord: round 0.039 to 2.000 in, square 0.099 to 1.000 in, 4-lobed X-ring cord 0.103 to 1.000 in; durometers 40 to 90 — web — Publisher's page; dimensions are facts — https://www.marcorubber.com/cord.htm\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=o-ring-cord-stock-sizes\n",
 "sources": [
  {
   "publisher": "McMaster-Carr",
   "title": "O-ring cord stock (for cord width filter: inch and metric diameters as listed) (free STEP/IGES per part, for your own design use; no redistribution)",
   "url": "https://www.mcmaster.com/products/o-ring-stock",
   "formats": [
    "STEP",
    "IGES",
    "PDF"
   ],
   "license": "McMaster-Carr site terms: personal design use, no redistribution",
   "license_verified": false,
   "hosted": false
  },
  {
   "publisher": "Marco Rubber & Plastics",
   "title": "O-ring cord: round 0.039 to 2.000 in, square 0.099 to 1.000 in, 4-lobed X-ring cord 0.103 to 1.000 in; durometers 40 to 90",
   "url": "https://www.marcorubber.com/cord.htm",
   "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": [
  "as568-o-rings",
  "o-rings-metric",
  "oring-grooves-metric",
  "oring-gland-static-radial-as568",
  "oring-gland-dynamic-reciprocating-as568",
  "backup-rings-as568-parker-8-xxx",
  "quad-rings-x-rings-as568"
 ],
 "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": "diameter",
   "exact": "0.070 / 0.103 / 0.139 / 0.210 / 0.275 in (1.78 / 2.62 / 3.53 / 5.33 / 6.99 mm)",
   "mates": "AS568 O-ring cross-section by series (-0xx to -4xx) and its groove on the oring-gland pages",
   "fit": "designed",
   "files": "all"
  },
  {
   "feature": "metric diameter",
   "exact": "1.5 / 1.6 / 2 / 2.4 / 2.5 / 3 / 3.5 / 4 / 5 / 5.7 / 8.4 mm (McMaster list)",
   "mates": "metric O-ring groove on oring-grooves-metric (cross-sections 1.0 to 5.7 mm)",
   "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 diameter cord makes a -214 O-ring?",
   "a": "0.139 in (3.53 mm): the -2xx series. McMaster-Carr lists a 0.139 in cord; the groove for that cross-section is on oring-gland-static-radial-as568."
  },
  {
   "q": "What metric O-ring cord sizes are there?",
   "a": "McMaster-Carr lists 1.5, 1.6, 2, 2.4, 2.5, 3, 3.5, 4, 5, 5.7 and 8.4 mm cord stock."
  },
  {
   "q": "What AS568 cross-section is 0.275 in cord?",
   "a": "The -4xx series (6.99 mm cross-section), the largest standard AS568 series."
  }
 ],
 "files_license": null,
 "offers": [],
 "markdown": "https://xemstudio.com/objects/o-ring-cord-stock-sizes/index.md"
}