{
 "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": "conical-spring-washers-din-6796",
 "name": "Conical spring washers DIN 6796, M2–M125: bore, outside diameter, thickness, height, load to flat + 10 cone models",
 "kind": "standard",
 "category": "Hardware",
 "group": "Fasteners",
 "year": null,
 "question": "What are the dimensions of a DIN 6796 conical spring washer (M6, M8, M10), and what is the difference from DIN 2093 disc springs?",
 "tags": [
  "conical spring washer",
  "din 6796",
  "belleville washer",
  "cone washer",
  "spring washer",
  "disc spring",
  "preload washer",
  "fastener",
  "washer"
 ],
 "aliases": [
  "din 6796 dimensions",
  "din 6796 m8 washer",
  "conical spring washer m6",
  "din 6796 m10 18 mm",
  "conical washer 8.4 mm",
  "din 6796 vs din 2093",
  "din 6796 m5 height",
  "conical spring washer size chart",
  "din 6796 m12 load",
  "din 6796 m3 thickness",
  "belleville washer m8 6796",
  "din 6796 stl step"
 ],
 "overall_mm": {
  "length": 56,
  "width": 56,
  "height": 7.75
 },
 "official_cad": false,
 "xem_status": "free-files",
 "les": false,
 "free_files": 10,
 "url": "https://xemstudio.com/objects/conical-spring-washers-din-6796/",
 "sheet_txt": "https://xemstudio.com/objects/conical-spring-washers-din-6796/sheet.txt",
 "sheet": {
  "basis": "fasten.it's DIN 6796 table (08/2009 edition, M2 to M125) checked against Westfield Fasteners (M2 to M30, with tolerance classes) and a Böllhoff stainless data sheet (M3 to M16); ten revolved cones as files",
  "overall_mm": {
   "length": 56,
   "width": 56,
   "height": 7.75
  },
  "notes": [
   "Millimetres. DIN 6796 conical spring washers for bolted connections (the 08/2009 edition supersedes 10/1987). fasten.it prints the bore as 'd' and the outside diameter as 'd1' without defining them; Westfield names the bore d1 (class H14) and the OD d2 (class h14). Both give the same numbers. Columns here: bore, OD, thickness s, free height h min / max, approximate load to flat (N, fasten.it only; Westfield's page has no force column) and approximate mass in kg per 1000 pieces.",
   "Agreement: fasten.it and Westfield give identical bore, OD and h for M2 to M30; Böllhoff's stainless sheet agrees on d1, d2, s and h for M3, 3.5, 4, 5, 6, 8, 10, 12, 14 and 16. One difference: for M7 fasten.it prints s 1.8, Westfield 1.75 (M7 has no file). fasten.it prints a 37.2 bore for M36, which Westfield's page does not reach. The load column is as printed by fasten.it and is not a spring rate.",
   "DIN 6796 is a single-cone washer for taking up play and keeping preload in bolted joints; it is not the DIN 2093 Belleville disc spring (see disc-springs-din-2093, which has load-deflection series). Wave forms: wave-spring-washers-din-137.",
   "Files: a plain revolved cone with the published bore, OD and thickness s, drawn at the maximum free height h (inner edge up). h min / h max are printed as a range, so the file shows the upper limit only; no chamfers, radii or edge rounding are published as numbers. Böllhoff (maker) sells these with CAD per article; linked, not copied."
  ],
  "table": {
   "columns": [
    "size",
    "bore d1, H14 (mm)",
    "OD d2, h14 (mm)",
    "thickness s (mm)",
    "height h min / max (mm)",
    "load to flat (N, fasten.it)",
    "mass (kg / 1000, fasten.it)",
    "note"
   ],
   "rows": [
    [
     "M2",
     2.2,
     5,
     0.4,
     "0.5 / 0.6",
     628,
     0.05,
     ""
    ],
    [
     "M2.5",
     2.7,
     6,
     0.5,
     "0.61 / 0.72",
     946,
     0.09,
     ""
    ],
    [
     "M3",
     3.2,
     7,
     0.6,
     "0.72 / 0.85",
     1320,
     0.14,
     ""
    ],
    [
     "M3.5",
     3.7,
     8,
     0.8,
     "0.92 / 1.06",
     2410,
     0.25,
     ""
    ],
    [
     "M4",
     4.3,
     9,
     1,
     "1.12 / 1.3",
     3770,
     0.38,
     ""
    ],
    [
     "M5",
     5.3,
     11,
     1.2,
     "1.35 / 1.55",
     5480,
     0.69,
     ""
    ],
    [
     "M6",
     6.4,
     14,
     1.5,
     "1.7 / 2",
     8590,
     1.43,
     ""
    ],
    [
     "M7",
     7.4,
     17,
     1.8,
     "2 / 2.3",
     11300,
     2.53,
     "Westfield prints s 1.75 (fasten.it 1.8)"
    ],
    [
     "M8",
     8.4,
     18,
     2,
     "2.24 / 2.6",
     14900,
     3.13,
     ""
    ],
    [
     "M10",
     10.5,
     23,
     2.5,
     "2.8 / 3.2",
     22100,
     6.45,
     ""
    ],
    [
     "M12",
     13,
     29,
     3,
     "3.43 / 3.95",
     34100,
     12.4,
     ""
    ],
    [
     "M14",
     15,
     35,
     3.5,
     "4.04 / 4.65",
     46000,
     21.6,
     ""
    ],
    [
     "M16",
     17,
     39,
     4,
     "4.58 / 5.25",
     59700,
     30.4,
     ""
    ],
    [
     "M18",
     19,
     42,
     4.5,
     "5.08 / 5.8",
     74400,
     38.9,
     ""
    ],
    [
     "M20",
     21,
     45,
     5,
     "5.6 / 6.4",
     93200,
     48.8,
     ""
    ],
    [
     "M22",
     23,
     49,
     5.5,
     "6.15 / 7.05",
     113700,
     63.5,
     ""
    ],
    [
     "M24",
     25,
     56,
     6,
     "6.77 / 7.75",
     131000,
     92.9,
     ""
    ],
    [
     "M27",
     28,
     60,
     6.5,
     "7.3 / 8.35",
     154000,
     113,
     ""
    ],
    [
     "M30",
     31,
     70,
     7,
     "8 / 9.2",
     172000,
     170,
     ""
    ],
    [
     "M33",
     34,
     76,
     7.5,
     "8.5 / 10",
     226000,
     214,
     ""
    ],
    [
     "M36",
     37.2,
     83,
     8,
     "9.2 / 10.5",
     276000,
     271,
     ""
    ],
    [
     "M42",
     43.5,
     96,
     8.5,
     "10.5 / 12",
     290000,
     384,
     ""
    ],
    [
     "M48",
     49.5,
     110,
     9,
     "11 / 12.5",
     261000,
     535,
     ""
    ],
    [
     "M56",
     58,
     128,
     9.5,
     "12 / 13.5",
     260000,
     762,
     ""
    ],
    [
     "M64",
     66,
     136,
     10,
     "12.8 / 14",
     277000,
     871,
     ""
    ],
    [
     "M72",
     74,
     145,
     10.5,
     "13 / 15",
     327000,
     1007,
     ""
    ],
    [
     "M90",
     92.5,
     160,
     11,
     "14 / 16",
     378000,
     1155,
     ""
    ],
    [
     "M100",
     102.5,
     180,
     11.5,
     "15 / 17",
     370000,
     1552,
     ""
    ],
    [
     "M125",
     128,
     220,
     12,
     "16.5 / 19",
     365000,
     2367,
     ""
    ]
   ]
  }
 },
 "sheet_text": "Conical spring washers DIN 6796, M2–M125: bore, outside diameter, thickness, height, load to flat + 10 cone models — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/conical-spring-washers-din-6796/  (sheet CC BY 4.0)\nBasis: fasten.it's DIN 6796 table (08/2009 edition, M2 to M125) checked against Westfield Fasteners (M2 to M30, with tolerance classes) and a Böllhoff stainless data sheet (M3 to M16); ten revolved cones as files\nCatalog version: 2026-10-20\n\nOverall (mm): length 56.0, width 56.0, height 7.75\n- Millimetres. DIN 6796 conical spring washers for bolted connections (the 08/2009 edition supersedes 10/1987). fasten.it prints the bore as 'd' and the outside diameter as 'd1' without defining them; Westfield names the bore d1 (class H14) and the OD d2 (class h14). Both give the same numbers. Columns here: bore, OD, thickness s, free height h min / max, approximate load to flat (N, fasten.it only; Westfield's page has no force column) and approximate mass in kg per 1000 pieces.\n- Agreement: fasten.it and Westfield give identical bore, OD and h for M2 to M30; Böllhoff's stainless sheet agrees on d1, d2, s and h for M3, 3.5, 4, 5, 6, 8, 10, 12, 14 and 16. One difference: for M7 fasten.it prints s 1.8, Westfield 1.75 (M7 has no file). fasten.it prints a 37.2 bore for M36, which Westfield's page does not reach. The load column is as printed by fasten.it and is not a spring rate.\n- DIN 6796 is a single-cone washer for taking up play and keeping preload in bolted joints; it is not the DIN 2093 Belleville disc spring (see disc-springs-din-2093, which has load-deflection series). Wave forms: wave-spring-washers-din-137.\n- Files: a plain revolved cone with the published bore, OD and thickness s, drawn at the maximum free height h (inner edge up). h min / h max are printed as a range, so the file shows the upper limit only; no chamfers, radii or edge rounding are published as numbers. Böllhoff (maker) sells these with CAD per article; linked, not copied.\n\nsize  bore d1, H14 (mm)  OD d2, h14 (mm)  thickness s (mm)  height h min / max (mm)  load to flat (N, fasten.it)  mass (kg / 1000, fasten.it)  note\nM2  2.2  5  0.4  0.5 / 0.6  628  0.05  \nM2.5  2.7  6  0.5  0.61 / 0.72  946  0.09  \nM3  3.2  7  0.6  0.72 / 0.85  1320  0.14  \nM3.5  3.7  8  0.8  0.92 / 1.06  2410  0.25  \nM4  4.3  9  1  1.12 / 1.3  3770  0.38  \nM5  5.3  11  1.2  1.35 / 1.55  5480  0.69  \nM6  6.4  14  1.5  1.7 / 2  8590  1.43  \nM7  7.4  17  1.8  2 / 2.3  11300  2.53  Westfield prints s 1.75 (fasten.it 1.8)\nM8  8.4  18  2  2.24 / 2.6  14900  3.13  \nM10  10.5  23  2.5  2.8 / 3.2  22100  6.45  \nM12  13  29  3  3.43 / 3.95  34100  12.4  \nM14  15  35  3.5  4.04 / 4.65  46000  21.6  \nM16  17  39  4  4.58 / 5.25  59700  30.4  \nM18  19  42  4.5  5.08 / 5.8  74400  38.9  \nM20  21  45  5  5.6 / 6.4  93200  48.8  \nM22  23  49  5.5  6.15 / 7.05  113700  63.5  \nM24  25  56  6  6.77 / 7.75  131000  92.9  \nM27  28  60  6.5  7.3 / 8.35  154000  113  \nM30  31  70  7  8 / 9.2  172000  170  \nM33  34  76  7.5  8.5 / 10  226000  214  \nM36  37.2  83  8  9.2 / 10.5  276000  271  \nM42  43.5  96  8.5  10.5 / 12  290000  384  \nM48  49.5  110  9  11 / 12.5  261000  535  \nM56  58  128  9.5  12 / 13.5  260000  762  \nM64  66  136  10  12.8 / 14  277000  871  \nM72  74  145  10.5  13 / 15  327000  1007  \nM90  92.5  160  11  14 / 16  378000  1155  \nM100  102.5  180  11.5  15 / 17  370000  1552  \nM125  128  220  12  16.5 / 19  365000  2367  \n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- fasten.it: DIN 6796 conical spring washers for bolted connections, 08/2009: thread size, bore, OD, thickness s, height h min / max, load to flat, mass (M2 to M125) — web — Reference page; numbers only. The page does not define its column letters — https://fasten.it/en/norms/norm/din_6796\n- Westfield Fasteners: DIN 6796 conical spring washers: d1 (H14), d2 (h14), s, h max / min (M2 to M30) — web — Publisher's page; dimensions are facts — https://www.westfieldfasteners.co.uk/Standards/Washer-SprgCone-M.html\n- Böllhoff (eshop PDF): DIN 6796 stainless A2 conical spring washers: d1, d2, h min / max, s (M3 to M16) — web — Maker data sheet; numbers only — https://eshop-cz.boellhoff.com/out/media/pdf/DIN_6796_Edelstahl_A2___en.pdf\n- Böllhoff (eshop): Conical spring washers for threaded connections (maker page, CAD downloads per article) — web, CAD per article — Maker / distributor page; dimensions are facts [verify license at link] — https://eshop-hu.boellhoff.com/en/Washers/Resilient-washers-spring-washers/Conical-spring-washers/Conical-spring-washers-for-threaded-connections-3-1000.html\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 10 parts): https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/index.json\nAPI: https://xemstudio.com/api/geometry?object=conical-spring-washers-din-6796\n",
 "sources": [
  {
   "publisher": "fasten.it",
   "title": "DIN 6796 conical spring washers for bolted connections, 08/2009: thread size, bore, OD, thickness s, height h min / max, load to flat, mass (M2 to M125)",
   "url": "https://fasten.it/en/norms/norm/din_6796",
   "formats": [
    "web"
   ],
   "license": "Reference page; numbers only. The page does not define its column letters",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Westfield Fasteners",
   "title": "DIN 6796 conical spring washers: d1 (H14), d2 (h14), s, h max / min (M2 to M30)",
   "url": "https://www.westfieldfasteners.co.uk/Standards/Washer-SprgCone-M.html",
   "formats": [
    "web"
   ],
   "license": "Publisher's page; dimensions are facts",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Böllhoff (eshop PDF)",
   "title": "DIN 6796 stainless A2 conical spring washers: d1, d2, h min / max, s (M3 to M16)",
   "url": "https://eshop-cz.boellhoff.com/out/media/pdf/DIN_6796_Edelstahl_A2___en.pdf",
   "formats": [
    "web"
   ],
   "license": "Maker data sheet; numbers only",
   "license_verified": true,
   "hosted": false
  },
  {
   "publisher": "Böllhoff (eshop)",
   "title": "Conical spring washers for threaded connections (maker page, CAD downloads per article)",
   "url": "https://eshop-hu.boellhoff.com/en/Washers/Resilient-washers-spring-washers/Conical-spring-washers/Conical-spring-washers-for-threaded-connections-3-1000.html",
   "formats": [
    "web",
    "CAD per article"
   ],
   "license": "Maker / distributor page; dimensions are facts",
   "license_verified": false,
   "hosted": false
  }
 ],
 "xem": {
  "status": "free-files",
  "sheet_free": true,
  "mesh_price_usd": null,
  "step_price_usd": null,
  "tolerance_mm": null
 },
 "related": [
  "disc-springs-din-2093",
  "wave-spring-washers-din-137",
  "spring-lock-washers-din-127-b",
  "serrated-lock-washers-din-6798",
  "flat-washers-metric",
  "flat-washers-iso-7090-m5-m64",
  "nord-lock-wedge-locking-washers",
  "socket-head-cap-screws-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": "Ø3.2 (M3), 4.3, 5.3, 6.4 (M6), 8.4 (M8), 10.5 (M10), 13 (M12), 17 (M16), 21 (M20), 25 (M24) mm, tolerance class H14",
   "mates": "bolt or screw of the same thread, passing through the washer",
   "fit": "slide",
   "files": "conical-washer-din-6796-"
  },
  {
   "feature": "outside diameter",
   "exact": "Ø7 (M3), 9, 11, 14 (M6), 18 (M8), 23 (M10), 29 (M12), 39 (M16), 45 (M20), 56 (M24) mm, tolerance class h14",
   "mates": "counterbore or seat under the head or nut",
   "fit": "designed",
   "files": "conical-washer-din-6796-"
  },
  {
   "feature": "overall height h (free, drawn at h max)",
   "exact": "h max 0.85 (M3) to 7.75 (M24); h min 0.72 to 6.77 mm",
   "mates": "clearance for the washer to flatten under load (flat height = s)",
   "fit": "designed",
   "files": "conical-washer-din-6796-"
  }
 ],
 "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 are the dimensions of a DIN 6796 M8 conical washer?",
   "a": "Bore 8.4 mm, OD 18 mm, thickness 2 mm, free height 2.24 to 2.6 mm (fasten.it and Westfield); load to flat about 14 900 N (fasten.it)."
  },
  {
   "q": "How is DIN 6796 different from DIN 2093?",
   "a": "DIN 6796 is a stiff conical washer for bolted joints with a bore sized to the bolt; DIN 2093 is a Belleville disc spring series with defined load-deflection curves."
  },
  {
   "q": "What tolerance class is the bore of a DIN 6796 washer?",
   "a": "H14 for the bore and h14 for the OD (Westfield)."
  }
 ],
 "files_license": null,
 "offers": [
  {
   "file": "conical-washer-din-6796-m3",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m3.step",
   "stl": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m3.stl",
   "note": "DIN 6796 M3 conical spring washer: bore Ø3.2, OD Ø7, thickness 0.6, overall height h 0.85 mm (the maximum of h 0.72 to 0.85); a plain cone, inner edge up, no chamfers or radii"
  },
  {
   "file": "conical-washer-din-6796-m4",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m4.step",
   "stl": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m4.stl",
   "note": "DIN 6796 M4 conical spring washer: bore Ø4.3, OD Ø9, thickness 1, overall height h 1.3 mm (the maximum of h 1.12 to 1.3); a plain cone, inner edge up, no chamfers or radii"
  },
  {
   "file": "conical-washer-din-6796-m5",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m5.step",
   "stl": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m5.stl",
   "note": "DIN 6796 M5 conical spring washer: bore Ø5.3, OD Ø11, thickness 1.2, overall height h 1.55 mm (the maximum of h 1.35 to 1.55); a plain cone, inner edge up, no chamfers or radii"
  },
  {
   "file": "conical-washer-din-6796-m6",
   "formats": [
    "step",
    "stl"
   ],
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   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m6.step",
   "stl": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m6.stl",
   "note": "DIN 6796 M6 conical spring washer: bore Ø6.4, OD Ø14, thickness 1.5, overall height h 2 mm (the maximum of h 1.7 to 2); a plain cone, inner edge up, no chamfers or radii"
  },
  {
   "file": "conical-washer-din-6796-m8",
   "formats": [
    "step",
    "stl"
   ],
   "price_usd": 0,
   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m8.step",
   "stl": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m8.stl",
   "note": "DIN 6796 M8 conical spring washer: bore Ø8.4, OD Ø18, thickness 2, overall height h 2.6 mm (the maximum of h 2.24 to 2.6); a plain cone, inner edge up, no chamfers or radii"
  },
  {
   "file": "conical-washer-din-6796-m10",
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   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m10.step",
   "stl": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m10.stl",
   "note": "DIN 6796 M10 conical spring washer: bore Ø10.5, OD Ø23, thickness 2.5, overall height h 3.2 mm (the maximum of h 2.8 to 3.2); a plain cone, inner edge up, no chamfers or radii"
  },
  {
   "file": "conical-washer-din-6796-m12",
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   "stl": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m12.stl",
   "note": "DIN 6796 M12 conical spring washer: bore Ø13, OD Ø29, thickness 3, overall height h 3.95 mm (the maximum of h 3.43 to 3.95); a plain cone, inner edge up, no chamfers or radii"
  },
  {
   "file": "conical-washer-din-6796-m16",
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   "stl": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m16.stl",
   "note": "DIN 6796 M16 conical spring washer: bore Ø17, OD Ø39, thickness 4, overall height h 5.25 mm (the maximum of h 4.58 to 5.25); a plain cone, inner edge up, no chamfers or radii"
  },
  {
   "file": "conical-washer-din-6796-m20",
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   "stl": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m20.stl",
   "note": "DIN 6796 M20 conical spring washer: bore Ø21, OD Ø45, thickness 5, overall height h 6.4 mm (the maximum of h 5.6 to 6.4); a plain cone, inner edge up, no chamfers or radii"
  },
  {
   "file": "conical-washer-din-6796-m24",
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   "license": "CC BY 4.0 (Xem Studio)",
   "step": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m24.step",
   "stl": "https://xemstudio.com/files/hardware/conical-spring-washers-din-6796/conical-washer-din-6796-m24.stl",
   "note": "DIN 6796 M24 conical spring washer: bore Ø25, OD Ø56, thickness 6, overall height h 7.75 mm (the maximum of h 6.77 to 7.75); a plain cone, inner edge up, no chamfers or radii"
  }
 ],
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