{ "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": "flange-nuts-din-6923", "name": "Hex flange nuts, DIN 6923: M3–M20 across flats, flange diameter, height, flange thickness + M5–M16 envelope files", "kind": "standard", "category": "Hardware", "group": "Fasteners", "year": null, "question": "What are the dimensions of a DIN 6923 flange nut, and how wide is an M8 flange nut?", "tags": [ "flange nut", "hex flange nut", "din 6923", "washer nut", "serrated flange nut", "fastener" ], "aliases": [ "din 6923 flange nut dimensions", "m8 flange nut size", "m6 flange nut across flats", "m10 flange nut diameter", "flange nut m5 dimensions", "m12 hex flange nut height", "din 6923 m8 17.9 mm", "flange nut pocket size m8", "m16 flange nut dimensions", "flange nut stl step" ], "overall_mm": { "length": 34.5, "width": 34.5, "height": 16 }, "official_cad": false, "xem_status": "free-files", "les": false, "free_files": 6, "url": "https://xemstudio.com/objects/flange-nuts-din-6923/", "sheet_txt": "https://xemstudio.com/objects/flange-nuts-din-6923/sheet.txt", "sheet": { "basis": "Westfield Fasteners' DIN 6923 table (M5 to M20) and Kanebridge's sheet (M3 to M12); the two agree on s, m and the flange diameter wherever both give a value; six envelope files", "overall_mm": { "length": 34.5, "width": 34.5, "height": 16 }, "notes": [ "DIN 6923 is the hexagon nut with a plain (non-serrated) flange. Westfield columns (mm): p pitch; c flange thickness (min); da bearing inner diameter (min / max); dc flange diameter (max); dw outer bearing diameter (min); e across corners (min); m nut height (max / min); s width across flats (max / min). Sizes in brackets are reference only: the page says M3 and M4 are not made to DIN 6923 and gives no bearing diameters or heights for them.", "Kanebridge's sheet (F across flats max / min, H overall height max / min, B flange diameter max) agrees with Westfield on s, m and the flange diameter for M5 to M12 (e.g. M8: 13, 8.0 / 7.6, 17.9; M12: 18, 12.0 / 11.6, 26.0). Kanebridge prints M3 and M4 values (5.5 / 4.0 / 8.0 and 7.0 / 4.65 / 10.0) that agree with Westfield's reference-only figures for the across-flats size and (M4) height, but its M3 flange diameter is 8.0 against 7.8 and the page does not state units.", "Files are Xem-drawn envelopes of sizes M5, M6, M8, M10, M12 and M16: a hexagon of width across flats s max, a circular flange of dc max by c min at the base, overall height m max, plain bore at the nominal thread diameter. The flange-to-body transition, chamfers and the serrated-flange variant are not modelled. Flange thickness c is a minimum, so a real flange may be thicker.", "ISO 4161 and the serrated flange (DIN 6923 with serration) are not tabulated here. McMaster-Carr sells DIN 6923 flange nuts with per-part STEP; the category is linked, not copied." ], "table": { "columns": [ "source", "thread", "p (mm)", "c min", "da min / max", "dc max", "dw min", "e min", "m (height) max / min", "s (across flats) max / min" ], "rows": [ [ "Westfield (reference only)", "(M3)", "0.5", "—", "—", "7.8", "—", "6.33", "3.8", "5.5" ], [ "Westfield (reference only)", "(M4)", "0.7", "—", "—", "10", "—", "7.66", "4.65", "7" ], [ "Westfield", "M5", "0.8", "1", "5 / 5.75", "11.8", "9.8", "8.79", "5 / 4.7", "8 / 7.78" ], [ "Westfield", "M6", "1", "1.1", "6 / 6.75", "14.2", "12.2", "11.05", "6 / 5.7", "10 / 9.78" ], [ "Westfield", "M8", "1.25", "1.2", "8 / 8.75", "17.9", "15.8", "14.38", "8 / 7.6", "13 / 12.73" ], [ "Westfield", "M10", "1.5", "1.5", "10 / 10.8", "21.8", "19.6", "16.64", "10 / 9.6", "15 / 14.73" ], [ "Westfield", "M12", "1.75", "1.8", "12 / 13", "26", "23.8", "20.03", "12 / 11.6", "18 / 17.73" ], [ "Westfield", "M14", "2", "2.1", "14 / 15.1", "29.9", "27.6", "23.36", "14 / 13.3", "21 / 20.67" ], [ "Westfield", "M16", "2", "2.4", "16 / 17.3", "34.5", "31.9", "26.75", "16 / 15.3", "24 / 23.67" ], [ "Westfield", "M20", "2.5", "3", "20 / 21.6", "42.8", "39.9", "32.95", "20 / 18.9", "30 / 29.67" ], [ "Kanebridge", "M3", "0.5", "—", "—", "8", "—", "—", "4 / 3.4", "5.5 / 5.3" ], [ "Kanebridge", "M4", "0.7", "—", "—", "10", "—", "—", "4.65 / 4.2", "7 / 6.78" ], [ "Kanebridge", "M5", "0.8", "—", "—", "11.8", "—", "—", "5 / 4.7", "8 / 7.78" ], [ "Kanebridge", "M6", "1", "—", "—", "14.2", "—", "—", "6 / 5.7", "10 / 9.78" ], [ "Kanebridge", "M8", "1.25", "—", "—", "17.9", "—", "—", "8 / 7.6", "13 / 12.73" ], [ "Kanebridge", "M10", "1.5", "—", "—", "21.8", "—", "—", "10 / 9.6", "15 / 14.73" ], [ "Kanebridge", "M12", "1.75", "—", "—", "26", "—", "—", "12 / 11.6", "18 / 17.73" ] ] } }, "sheet_text": "Hex flange nuts, DIN 6923: M3–M20 across flats, flange diameter, height, flange thickness + M5–M16 envelope files — dimension sheet\nSource: Xem Studio, https://xemstudio.com/objects/flange-nuts-din-6923/ (sheet CC BY 4.0)\nBasis: Westfield Fasteners' DIN 6923 table (M5 to M20) and Kanebridge's sheet (M3 to M12); the two agree on s, m and the flange diameter wherever both give a value; six envelope files\nCatalog version: 2026-10-20\n\nOverall (mm): length 34.5, width 34.5, height 16.0\n- DIN 6923 is the hexagon nut with a plain (non-serrated) flange. Westfield columns (mm): p pitch; c flange thickness (min); da bearing inner diameter (min / max); dc flange diameter (max); dw outer bearing diameter (min); e across corners (min); m nut height (max / min); s width across flats (max / min). Sizes in brackets are reference only: the page says M3 and M4 are not made to DIN 6923 and gives no bearing diameters or heights for them.\n- Kanebridge's sheet (F across flats max / min, H overall height max / min, B flange diameter max) agrees with Westfield on s, m and the flange diameter for M5 to M12 (e.g. M8: 13, 8.0 / 7.6, 17.9; M12: 18, 12.0 / 11.6, 26.0). Kanebridge prints M3 and M4 values (5.5 / 4.0 / 8.0 and 7.0 / 4.65 / 10.0) that agree with Westfield's reference-only figures for the across-flats size and (M4) height, but its M3 flange diameter is 8.0 against 7.8 and the page does not state units.\n- Files are Xem-drawn envelopes of sizes M5, M6, M8, M10, M12 and M16: a hexagon of width across flats s max, a circular flange of dc max by c min at the base, overall height m max, plain bore at the nominal thread diameter. The flange-to-body transition, chamfers and the serrated-flange variant are not modelled. Flange thickness c is a minimum, so a real flange may be thicker.\n- ISO 4161 and the serrated flange (DIN 6923 with serration) are not tabulated here. McMaster-Carr sells DIN 6923 flange nuts with per-part STEP; the category is linked, not copied.\n\nsource thread p (mm) c min da min / max dc max dw min e min m (height) max / min s (across flats) max / min\nWestfield (reference only) (M3) 0.5 — — 7.8 — 6.33 3.8 5.5\nWestfield (reference only) (M4) 0.7 — — 10 — 7.66 4.65 7\nWestfield M5 0.8 1 5 / 5.75 11.8 9.8 8.79 5 / 4.7 8 / 7.78\nWestfield M6 1 1.1 6 / 6.75 14.2 12.2 11.05 6 / 5.7 10 / 9.78\nWestfield M8 1.25 1.2 8 / 8.75 17.9 15.8 14.38 8 / 7.6 13 / 12.73\nWestfield M10 1.5 1.5 10 / 10.8 21.8 19.6 16.64 10 / 9.6 15 / 14.73\nWestfield M12 1.75 1.8 12 / 13 26 23.8 20.03 12 / 11.6 18 / 17.73\nWestfield M14 2 2.1 14 / 15.1 29.9 27.6 23.36 14 / 13.3 21 / 20.67\nWestfield M16 2 2.4 16 / 17.3 34.5 31.9 26.75 16 / 15.3 24 / 23.67\nWestfield M20 2.5 3 20 / 21.6 42.8 39.9 32.95 20 / 18.9 30 / 29.67\nKanebridge M3 0.5 — — 8 — — 4 / 3.4 5.5 / 5.3\nKanebridge M4 0.7 — — 10 — — 4.65 / 4.2 7 / 6.78\nKanebridge M5 0.8 — — 11.8 — — 5 / 4.7 8 / 7.78\nKanebridge M6 1 — — 14.2 — — 6 / 5.7 10 / 9.78\nKanebridge M8 1.25 — — 17.9 — — 8 / 7.6 13 / 12.73\nKanebridge M10 1.5 — — 21.8 — — 10 / 9.6 15 / 14.73\nKanebridge M12 1.75 — — 26 — — 12 / 11.6 18 / 17.73\n\nFiles elsewhere (not hosted by Xem Studio; license as stated by the publisher):\n- Westfield Fasteners: DIN 6923 hexagon flange nuts: c, da, dc, dw, e, m, s, r, M5 to M20 ((M3) and (M4) reference only) — web — Publisher's page; dimensions are facts — https://www.westfieldfasteners.co.uk/Standards/Nut-HexFlgPln-M.html\n- Kanebridge (fastenersresource.com): DIN 6923 hex flange nuts M3 to M12: pitch, F across flats, H overall height, B flange diameter — web — Maker data sheet; numbers only — https://fastenersresource.com/sites/default/files/products/kanebridge/techsheets/MetDin6923.pdf\n- McMaster-Carr: DIN 6923 flange nuts (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/din-6923-nuts\n\nFree files (CC BY 4.0, Xem Studio; STEP + STL, 6 parts): https://xemstudio.com/files/hardware/flange-nuts-din-6923/index.json\nAPI: https://xemstudio.com/api/geometry?object=flange-nuts-din-6923\n", "sources": [ { "publisher": "Westfield Fasteners", "title": "DIN 6923 hexagon flange nuts: c, da, dc, dw, e, m, s, r, M5 to M20 ((M3) and (M4) reference only)", "url": "https://www.westfieldfasteners.co.uk/Standards/Nut-HexFlgPln-M.html", "formats": [ "web" ], "license": "Publisher's page; dimensions are facts", "license_verified": true, "hosted": false }, { "publisher": "Kanebridge (fastenersresource.com)", "title": "DIN 6923 hex flange nuts M3 to M12: pitch, F across flats, H overall height, B flange diameter", "url": "https://fastenersresource.com/sites/default/files/products/kanebridge/techsheets/MetDin6923.pdf", "formats": [ "web" ], "license": "Maker data sheet; numbers only", "license_verified": true, "hosted": false }, { "publisher": "McMaster-Carr", "title": "DIN 6923 flange nuts (free STEP/IGES per part, for your own design use; no redistribution)", "url": "https://www.mcmaster.com/din-6923-nuts", "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": [ "hex-nuts-metric", "hex-nuts-metric-m10-m24", "nylon-insert-lock-nuts-iso-7040-din-985", "flat-washers-metric", "large-washers-din-9021-iso-7093", "square-nuts-din-557" ], "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": "hex body", "exact": "across flats × height: M5 8 × 5, M6 10 × 6, M8 13 × 8, M10 15 × 10, M12 18 × 12, M16 24 × 16 mm (max)", "mates": "hex pocket that captures the nut: width = across flats + your process clearance", "fit": "slide", "files": "flange-nut-din-6923-" }, { "feature": "flange", "exact": "Ø11.8, 14.2, 17.9, 21.8, 26, 34.5 mm max × 1, 1.1, 1.2, 1.5, 1.8, 2.4 min thick (M5 to M16)", "mates": "round counterbore for the flange: Ø = dc + your process clearance", "fit": "slide", "files": "flange-nut-din-6923-" } ], "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": "How wide is an M8 flange nut?", "a": "13 mm across flats, flange 17.9 mm maximum, height 8 mm max / 7.6 min, flange thickness at least 1.2 mm (Westfield; Kanebridge agrees)." }, { "q": "Why does an M10 flange nut take a 15 mm wrench?", "a": "DIN 6923 uses s = 15 mm for M10 (and 18 for M12), smaller than the 16 and 18 of the plain ISO 4032 nut." } ], "files_license": null, "offers": [ { "file": "flange-nut-din-6923-m5-s-8-dc-11.8-m-5", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/flange-nuts-din-6923/flange-nut-din-6923-m5-s-8-dc-11.8-m-5.step", "stl": "https://xemstudio.com/files/hardware/flange-nuts-din-6923/flange-nut-din-6923-m5-s-8-dc-11.8-m-5.stl", "note": "M5 DIN 6923 hex flange nut envelope: hex 8 mm across flats (s max), flange Ø11.8 (dc max) × 1 mm (c min) at the base, overall height 5 mm (m max), plain Ø5 bore; no chamfer, serration or thread" }, { "file": "flange-nut-din-6923-m6-s-10-dc-14.2-m-6", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/flange-nuts-din-6923/flange-nut-din-6923-m6-s-10-dc-14.2-m-6.step", "stl": "https://xemstudio.com/files/hardware/flange-nuts-din-6923/flange-nut-din-6923-m6-s-10-dc-14.2-m-6.stl", "note": "M6 DIN 6923 hex flange nut envelope: hex 10 mm across flats (s max), flange Ø14.2 (dc max) × 1.1 mm (c min) at the base, overall height 6 mm (m max), plain Ø6 bore; no chamfer, serration or thread" }, { "file": "flange-nut-din-6923-m8-s-13-dc-17.9-m-8", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/flange-nuts-din-6923/flange-nut-din-6923-m8-s-13-dc-17.9-m-8.step", "stl": "https://xemstudio.com/files/hardware/flange-nuts-din-6923/flange-nut-din-6923-m8-s-13-dc-17.9-m-8.stl", "note": "M8 DIN 6923 hex flange nut envelope: hex 13 mm across flats (s max), flange Ø17.9 (dc max) × 1.2 mm (c min) at the base, overall height 8 mm (m max), plain Ø8 bore; no chamfer, serration or thread" }, { "file": "flange-nut-din-6923-m10-s-15-dc-21.8-m-10", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/flange-nuts-din-6923/flange-nut-din-6923-m10-s-15-dc-21.8-m-10.step", "stl": "https://xemstudio.com/files/hardware/flange-nuts-din-6923/flange-nut-din-6923-m10-s-15-dc-21.8-m-10.stl", "note": "M10 DIN 6923 hex flange nut envelope: hex 15 mm across flats (s max), flange Ø21.8 (dc max) × 1.5 mm (c min) at the base, overall height 10 mm (m max), plain Ø10 bore; no chamfer, serration or thread" }, { "file": "flange-nut-din-6923-m12-s-18-dc-26-m-12", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/flange-nuts-din-6923/flange-nut-din-6923-m12-s-18-dc-26-m-12.step", "stl": "https://xemstudio.com/files/hardware/flange-nuts-din-6923/flange-nut-din-6923-m12-s-18-dc-26-m-12.stl", "note": "M12 DIN 6923 hex flange nut envelope: hex 18 mm across flats (s max), flange Ø26 (dc max) × 1.8 mm (c min) at the base, overall height 12 mm (m max), plain Ø12 bore; no chamfer, serration or thread" }, { "file": "flange-nut-din-6923-m16-s-24-dc-34.5-m-16", "formats": [ "step", "stl" ], "price_usd": 0, "license": "CC BY 4.0 (Xem Studio)", "step": "https://xemstudio.com/files/hardware/flange-nuts-din-6923/flange-nut-din-6923-m16-s-24-dc-34.5-m-16.step", "stl": "https://xemstudio.com/files/hardware/flange-nuts-din-6923/flange-nut-din-6923-m16-s-24-dc-34.5-m-16.stl", "note": "M16 DIN 6923 hex flange nut envelope: hex 24 mm across flats (s max), flange Ø34.5 (dc max) × 2.4 mm (c min) at the base, overall height 16 mm (m max), plain Ø16 bore; no chamfer, serration or thread" } ], "markdown": "https://xemstudio.com/objects/flange-nuts-din-6923/index.md" }