# Flat washers, ISO 7090 (chamfered, normal series): M5–M64 bore, outside diameter, thickness + M30–M48 washer files > What are the ISO 7090 washer dimensions, and how big is an M30 or M36 flat washer? - Category: Hardware › Fasteners - Kind: Standard part - Basis: Westfield Fasteners' ISO 7090 table (M5 to M64), cross-checked on M10 against McMaster-Carr's DIN 125 / ISO 7089 listings; four large-size washer files - Page: https://xemstudio.com/objects/flat-washers-iso-7090-m5-m64/ · JSON: https://xemstudio.com/api/geometry?object=flat-washers-iso-7090-m5-m64 · Plain text: https://xemstudio.com/objects/flat-washers-iso-7090-m5-m64/sheet.txt - License: dimension sheet CC BY 4.0 (Xem Studio); files CC BY 4.0 or their publisher's license - Use in every chat: add https://xemstudio.com/mcp as a connector (https://xemstudio.com/use-with-ai/) ## Overall (mm) | length | width | height | |---|---|---| | 110.0 | 110.0 | 8.0 | **Exact dimensions.** Every file is drawn at true size with no tolerance added. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your process's clearance before making the part. ## Notes - ISO 7090 is the normal-series plain washer with a chamfered outside edge, product grade A, in 200 HV and 300 HV. Westfield's page says it replaces type B of DIN 125. Columns in mm: bore d1 (nominal = minimum, then maximum), outside d2 (nominal = maximum, then minimum), thickness h (nominal, max, min). Sizes in brackets are non-preferred, as printed. - Conflict kept: Westfield prints d2 = 21 for M10 with a minimum of 19.48. A nominal of 21 would give a minimum of about 20.5, and McMaster-Carr's DIN 125 / ISO 7089 M10 washers are listed at 10.5 mm bore by 20 mm outside, the same as the existing page flat-washers-metric-m10-m24. The M10 outside diameter is therefore uncertain here (20 or 21); no M10 file is made. - The chamfer size and angle are not given in the Westfield page, so the files are plain annuli at M30, M36, M42 and M48 (larger than the M2–M24 sizes already on this site). Hardness classes: 200 HV (HV 200–300) and 300 HV (HV 300–400); stainless is 200 HV only (Westfield). - Smaller sizes: flat-washers-metric (M2–M8) and flat-washers-metric-m10-m24 (ISO 7089 / DIN 125-A). Large-OD version: large-washers-din-9021-iso-7093. ## Mating features (exact size; open press / slide / run / socket by your process clearance, leave designed and clamp as drawn) | feature | exact | mates with | fit | files | |---|---|---|---|---| | bore (d1) | M30 31, M36 37, M42 45, M48 52 mm nominal | bolt of the thread size; plain cylinder | designed | washer-iso-7090-* | | outside (d2) | M30 56, M36 64.8, M42 78, M48 92 mm | round counterbore that seats the washer: Ø = d2 + your process clearance | slide | washer-iso-7090-* | ## Sizes | thread | d1 nom = min | d1 max | d2 nom = max | d2 min | h nom | h max | h min | |---|---|---|---|---|---|---|---| | M5 | 5.3 | 5.48 | 10 | 9.64 | 1 | 1.1 | 0.9 | | M6 | 6.4 | 6.62 | 12 | 11.57 | 1.6 | 1.8 | 1.4 | | M8 | 8.4 | 8.62 | 16 | 15.57 | 1.6 | 1.8 | 1.4 | | M10 | 10.5 | 10.77 | 21 (as printed; see notes) | 19.48 | 2 | 2.2 | 1.8 | | M12 | 13 | 13.27 | 24 | 23.48 | 2.5 | 2.7 | 2.3 | | (M14) | 15 | 15.27 | 28 | 27.48 | 2.5 | 2.7 | 2.3 | | M16 | 17 | 17.27 | 30 | 29.48 | 3 | 3.3 | 2.7 | | (M18) | 19 | 19.33 | 34 | 33.38 | 3 | 3.3 | 2.7 | | M20 | 21 | 21.33 | 37 | 36.38 | 3 | 3.3 | 2.7 | | (M22) | 23 | 23.33 | 39 | 38.38 | 3 | 3.3 | 2.7 | | M24 | 25 | 25.33 | 44 | 43.38 | 4 | 4.3 | 3.7 | | (M27) | 28 | 28.33 | 50 | 49.38 | 4 | 4.3 | 3.7 | | M30 | 31 | 31.39 | 56 | 55.26 | 4 | 4.3 | 3.7 | | (M33) | 34 | 34.62 | 60 | 58.8 | 5 | 5.6 | 4.4 | | M36 | 37 | 37.62 | 64.8 | 64.8 | 5 | 5.6 | 4.4 | | (M39) | 42 | 42.62 | 72 | 70.8 | 6 | 6.6 | 5.4 | | M42 | 45 | 45.62 | 78 | 76.8 | 8 | 9 | 7 | | (M45) | 48 | 48.62 | 85 | 83.6 | 8 | 9 | 7 | | M48 | 52 | 52.74 | 92 | 90.6 | 8 | 9 | 7 | | (M52) | 56 | 56.74 | 98 | 96.6 | 8 | 9 | 7 | | M56 | 62 | 62.74 | 105 | 103.6 | 10 | 11 | 9 | | (M60) | 66 | 66.74 | 110 | 108.6 | 10 | 11 | 9 | | M64 | 70 | 70.74 | 115 | 113.6 | 10 | 11 | 9 | ## Where the files are - Westfield Fasteners: [ISO 7090 plain washers, chamfered, normal series, M5 to M64: d1, d2, h (nom / max / min)](https://westfieldfasteners.co.uk/Standards/Washer-ISO7090-M.pdf) — web — Publisher's page; dimensions are facts - McMaster-Carr: [DIN 125 A flat washers (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/din-125a-flat-washers) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link) ## Free STEP/STL (4 parts, CC BY 4.0, Xem Studio) Index: https://xemstudio.com/files/hardware/flat-washers-iso-7090-m5-m64/index.json - washer-iso-7090-m30-d1-31-d2-56-h-4: [STEP](https://xemstudio.com/files/hardware/flat-washers-iso-7090-m5-m64/washer-iso-7090-m30-d1-31-d2-56-h-4.step) · [STL](https://xemstudio.com/files/hardware/flat-washers-iso-7090-m5-m64/washer-iso-7090-m30-d1-31-d2-56-h-4.stl) — M30 ISO 7090 washer at nominal size: bore Ø31, outside Ø56, thickness 4 mm; the outer-edge chamfer is not dimensioned in the source and is not modelled - washer-iso-7090-m36-d1-37-d2-64.8-h-5: [STEP](https://xemstudio.com/files/hardware/flat-washers-iso-7090-m5-m64/washer-iso-7090-m36-d1-37-d2-64.8-h-5.step) · [STL](https://xemstudio.com/files/hardware/flat-washers-iso-7090-m5-m64/washer-iso-7090-m36-d1-37-d2-64.8-h-5.stl) — M36 ISO 7090 washer at nominal size: bore Ø37, outside Ø64.8, thickness 5 mm; the outer-edge chamfer is not dimensioned in the source and is not modelled - washer-iso-7090-m42-d1-45-d2-78-h-8: [STEP](https://xemstudio.com/files/hardware/flat-washers-iso-7090-m5-m64/washer-iso-7090-m42-d1-45-d2-78-h-8.step) · [STL](https://xemstudio.com/files/hardware/flat-washers-iso-7090-m5-m64/washer-iso-7090-m42-d1-45-d2-78-h-8.stl) — M42 ISO 7090 washer at nominal size: bore Ø45, outside Ø78, thickness 8 mm; the outer-edge chamfer is not dimensioned in the source and is not modelled - washer-iso-7090-m48-d1-52-d2-92-h-8: [STEP](https://xemstudio.com/files/hardware/flat-washers-iso-7090-m5-m64/washer-iso-7090-m48-d1-52-d2-92-h-8.step) · [STL](https://xemstudio.com/files/hardware/flat-washers-iso-7090-m5-m64/washer-iso-7090-m48-d1-52-d2-92-h-8.stl) — M48 ISO 7090 washer at nominal size: bore Ø52, outside Ø92, thickness 8 mm; the outer-edge chamfer is not dimensioned in the source and is not modelled ## Questions **What is the outside diameter of an M30 ISO 7090 washer?** 56 mm maximum (nominal), 55.26 mm minimum; bore 31 mm nominal, thickness 4 mm. **What is the difference between ISO 7089 and ISO 7090?** ISO 7090 has a chamfered outside edge; Westfield says it replaces type B of DIN 125. ISO 7089 is the plain (unchamfered) normal series. ## Fits with - [Flat washers, M2–M8 (ISO 7089)](https://xemstudio.com/objects/flat-washers-metric/) - [Flat washers, M10 to M24 (ISO 7089 / DIN 125-A)](https://xemstudio.com/objects/flat-washers-metric-m10-m24/) - [Large (fender) washers, DIN 9021 / ISO 7093: M2.5–M36 bore, outside diameter, thickness + nylon variant + 8 washer files](https://xemstudio.com/objects/large-washers-din-9021-iso-7093/) - [Spring lock washers, DIN 127 B (split washers, rectangular section): M2–M100 bore, outside diameter, width, thickness, free height](https://xemstudio.com/objects/spring-lock-washers-din-127-b/) - [Hex nuts, M10 to M24 (ISO 4032 / DIN 934)](https://xemstudio.com/objects/hex-nuts-metric-m10-m24/)