{ "version": "2026-10-20", "license": "Dimension sheets are written by Xem Studio from the cited sources and are free to use (CC BY 4.0, attribute 'Xem Studio'). Linked files belong to their publishers under the license shown; Xem Studio does not host them. 'license_verified: false' means the license shown is from memory or the publisher's page as last read and should be confirmed at the link before commercial use.", "slug": "flat-washers-metric", "name": "Flat washers, M2–M8 (ISO 7089)", "kind": "hardware", "category": "Hardware", "group": "Fasteners", "year": null, "question": "What are the dimensions of M3, M4 and M5 flat washers?", "tags": [ "washer", "fastener" ], "aliases": [ "m3 washer", "flat washer", "iso 7089", "din 125" ], "overall_mm": { "length": null, "width": null, "height": null }, "official_cad": false, "xem_status": "free-files", "les": false, "free_files": 7, "url": "https://xemstudio.com/objects/flat-washers-metric/", "sheet_txt": "https://xemstudio.com/objects/flat-washers-metric/sheet.txt", "sheet": { "basis": "ISO 7089 (normal series)", "overall_mm": { "length": null, "width": null, "height": null }, "notes": [ "Inner diameter clears the screw; outer diameter is what a counterbore has to accommodate if the washer sits in it." ], "table": { "columns": [ "thread", "id_mm", "od_mm", "thickness_mm" ], "rows": [ [ "M2", 2.2, 5, 0.3 ], [ "M2.5", 2.7, 6, 0.5 ], [ "M3", 3.2, 7, 0.5 ], [ "M4", 4.3, 9, 0.8 ], [ "M5", 5.3, 10, 1 ], [ "M6", 6.4, 12, 1.6 ], [ "M8", 8.4, 16, 1.6 ] ] } }, "sheet_text": "Flat washers, M2–M8 (ISO 7089) — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/flat-washers-metric/ (CC BY 4.0)\nBasis: ISO 7089 (normal series)\nCatalog version: 2026-10-20\n\nSizes: see table below\n- Inner diameter clears the screw; outer diameter is what a counterbore has to accommodate if the washer sits in it.\n\nthread id_mm od_mm thickness_mm\nM2 2.2 5 0.3\nM2.5 2.7 6 0.5\nM3 3.2 7 0.5\nM4 4.3 9 0.8\nM5 5.3 10 1\nM6 6.4 12 1.6\nM8 8.4 16 1.6\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- McMaster-Carr: Washers (free STEP/IGES/STL per part, for your own design use; no redistribution) — STEP, IGES, STL, PDF — McMaster-Carr site terms: personal design use, no redistribution [verify license at link] — https://www.mcmaster.com/products/washers/\n- Wikipedia: Washer (hardware) — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Washer_(hardware)\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 7 parts): https://xemstudio.com/files/hardware/flat-washers-metric/index.json\nAPI: https://xemstudio.com/api/geometry?object=flat-washers-metric\n", "sources": [ { "publisher": "McMaster-Carr", "title": "Washers (free STEP/IGES/STL per part, for your own design use; no redistribution)", "url": "https://www.mcmaster.com/products/washers/", "formats": [ "STEP", "IGES", "STL", "PDF" ], "license": "McMaster-Carr site terms: personal design use, no redistribution", "license_verified": false, "hosted": false }, { "publisher": "Wikipedia", "title": "Washer (hardware)", "url": "https://en.wikipedia.org/wiki/Washer_(hardware)", "formats": [ "web" ], "license": "CC BY-SA 4.0 (text)", "license_verified": true, "hosted": false } ], "xem": { "status": "free-files", "sheet_free": true, "mesh_price_usd": null, "step_price_usd": null, "tolerance_mm": null }, "related": [ "socket-head-cap-screws-metric", "hex-nuts-metric" ], "faq": [ { "q": "What is the outer diameter of an M3 washer?", "a": "7 mm OD, 3.2 mm ID, 0.5 mm thick (ISO 7089). M4: 9 mm OD; M5: 10 mm OD; M6: 12 mm OD; M8: 16 mm OD." }, { "q": "Do I need a washer under a screw head in a 3D print?", "a": "Yes for soft plastics or slotted holes: it spreads the load and stops the head sinking in. Size the counterbore to the washer OD, not the head." } ], "files_license": null, "offers": [ { "file": "washer-m2", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/flat-washers-metric/washer-m2.step", "stl": "https://xemstudio.com/files/hardware/flat-washers-metric/washer-m2.stl", "note": "ISO 7089 M2" }, { "file": "washer-m2.5", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/flat-washers-metric/washer-m2.5.step", "stl": "https://xemstudio.com/files/hardware/flat-washers-metric/washer-m2.5.stl", "note": "ISO 7089 M2.5" }, { "file": "washer-m3", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/flat-washers-metric/washer-m3.step", "stl": "https://xemstudio.com/files/hardware/flat-washers-metric/washer-m3.stl", "note": "ISO 7089 M3" }, { "file": "washer-m4", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/flat-washers-metric/washer-m4.step", "stl": "https://xemstudio.com/files/hardware/flat-washers-metric/washer-m4.stl", "note": "ISO 7089 M4" }, { "file": "washer-m5", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/flat-washers-metric/washer-m5.step", "stl": "https://xemstudio.com/files/hardware/flat-washers-metric/washer-m5.stl", "note": "ISO 7089 M5" }, { "file": "washer-m6", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/flat-washers-metric/washer-m6.step", "stl": "https://xemstudio.com/files/hardware/flat-washers-metric/washer-m6.stl", "note": "ISO 7089 M6" }, { "file": "washer-m8", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/flat-washers-metric/washer-m8.step", "stl": "https://xemstudio.com/files/hardware/flat-washers-metric/washer-m8.stl", "note": "ISO 7089 M8" } ], "markdown": "https://xemstudio.com/objects/flat-washers-metric/index.md" }