Applications and selection
Fastening assemblies needing the specified bearing area, clearance or stack thickness.
Specify inside diameter, outside diameter, thickness and hardness or material grade. Choose the series to fit the hole, bearing surface and assembly standard.
Dimensions & technical reference
ISO 7089:2000
Normal-series plain washers, product grade A. ISO 7090 is the chamfered variant. Select washer hardness for the bolt class; nominal bolt size is not the hole diameter.
| Nominal size | d min | d max | dc max | h nominal |
|---|---|---|---|---|
| Φ1.6 | 1.7 | 1.84 | 4 | 0.3 |
| Φ2 | 2.2 | 2.34 | 5 | 0.3 |
| Φ2.5 | 2.7 | 2.84 | 6 | 0.5 |
| Φ3 | 3.2 | 3.38 | 7 | 0.5 |
| (Φ3.5) | 3.7 | 3.88 | 8 | 0.5 |
| Φ4 | 4.3 | 4.48 | 9 | 0.8 |
| Φ5 | 5.3 | 5.48 | 10 | 1 |
| Φ6 | 6.4 | 6.62 | 12 | 1.6 |
| Φ8 | 8.4 | 8.62 | 16 | 1.6 |
| Φ10 | 10.5 | 10.77 | 20 | 2 |
| Φ12 | 13 | 13.27 | 24 | 2.5 |
| (Φ14) | 15 | 15.27 | 28 | 2.5 |
| Φ16 | 17 | 17.27 | 30 | 3 |
| (Φ18) | 19 | 19.33 | 34 | 3 |
| Φ20 | 21 | 21.33 | 37 | 3 |
| (Φ22) | 23 | 23.33 | 39 | 3 |
| Φ24 | 25 | 25.33 | 44 | 4 |
| (Φ27) | 28 | 28.33 | 50 | 4 |
| Φ30 | 31 | 31.39 | 56 | 4 |
| (Φ33) | 34 | 34.62 | 60 | 5 |
| Φ36 | 37 | 37.62 | 66 | 5 |
Dimensional source: 164580 · ISO 7089:2000 ↗. “—” means no value listed for this combination. P is thread pitch; min / max are dimensional limits. The selection above is not the full standard or a stock list.
Catalog inquiry range: M2 - M100. Availability, lengths, grades and finishes are confirmed by quotation. Sizes outside the cited reference table require the applicable standard dimensions or an approved drawing. Quote the exact standard and edition; DIN, ISO and U.S. references are not automatically interchangeable.
Materials, surface finishes and standards
Materials for this series: Carbon Steel, Stainless Steel. Surface finishes: Plain Black, Zinc Plated, HDG. Compatibility between the grade, finish and operating environment needs to be confirmed.
For titanium, nickel alloy or other non-ferrous requirements, include the exact material grade and drawing. Required mechanical properties, inspection documents and traceability should be stated in the inquiry.
Related U.S. reference for plain washers. Select by actual inside diameter, outside diameter, thickness and material rather than nominal size alone. Standards from different systems can vary in dimensions, threads, product scope and test requirements. Confirm the exact designation and edition in the quotation.
Technical reference: ISO 7089 scope. Product dimensions and the quoted standard must be confirmed together.
Ordering standard
ISO 7089:2000
United States references for a separate inquiry: ASME B18.21.1 (inch). Confirm the exact form, thread system and drawing before quoting.
What to send for a quotation
- Flat Washers or your part number, with the relevant standard and edition.
- Exact dimensions, thread details, quantity and any critical tolerances.
- Material grade, surface finish, inspection requirements and delivery destination.
- For customization, a drawing revision and a description of the mating assembly.
Common questions about flat washers
How is an M8 flat washer sized?
M8 identifies the nominal mating thread. In the selected DIN 125 A reference table shown here, the nominal dimensions are 8.4 mm inside diameter, 16 mm outside diameter and 1.6 mm thickness. Other series differ.
Can I request a size or material outside this listing?
Yes. Send the required dimensions and exact material grade for review. A quotation is needed to confirm feasibility, price and lead time.