Flat Washer standards
DIN125A ~ ISO7089
DIN433 ~ ISO7092
DIN9021 ~ ISO7093
Note: The following table is provided for guidance only as there are often dimensional variations between standards.
| Thread | Inside diameter | Outside diameter | Thickness | Standards | |
|---|---|---|---|---|---|
| M1 | 1.1/1.25 | 2.3/2.5 | 0.2/0.4 | DIN433 | BS4320A |
| M1.2 | 1.3/1.45 | 2.8/3 | 0.2/0.4 | DIN433 | BS4320A |
| M1.4 | 1.5/1.65 | 2.8/3 | 0.2/0.4 | DIN433 | BS4320A |
| M1.6 | 1.7/1.85 | 3.2/3.5 | 0.25/0.4 | DIN433 | ISO7092 |
| 1.7/1.85 | 3.7/4 | 0.25/0.4 | DIN125A | ISO7089 | |
| BS4320A | |||||
| 1.8/2.05 | 3.25/4 | 0.2/0.4 | ISO7091 | ISO7092 | |
| M2 | 2.2/2.35 | 4.2/4.5 | 0.25/4 | DIN433 | |
| 2.2/2.35 | 4.7/5 | 0.2/0.4 | DIN125A | ISO7089 | |
| BS4320A | |||||
| 2.4/2.6 | 3.25/4 | 0.2/0.4 | ISO7091 | ||
| M2.5 | 2.7/2.85 | 4.7/5 | 0.45/0.55 | DIN433 | ISO7092 |
| 2.7/2.85 | 5.7/6 | 0.45/0.55 | DIN125A | ISO7089 | |
| 2.9/3.2 | 5.3/6 | 0.4/0.6 | ISO7091 | ||
| 2.7/2.85 | 6.2/6.5 | 0.4/0.6 | BS4320A | ||
| 2.7/2.85 | 7.7/8 | 0.7/0.9 | DIN9021 | ||
| M3 | 3.2/3.4 | 5.7/6 | 0.45/0.55 | DIN433 | SO7092 |
| 3.2/3.4 | 6.7/7 | 0.45/0.55 | DIN125A | ISO7089 | |
| 3.4/3.7 | 6/7 | 0.4/0.6 | ISO7091 | ||
| 3.2/3.4 | 6.7/7 | 0.4/0.6 | BS4320A | ||
| 3/3.2 | 8.7/9 | 0.7/0.9 | DIN9021 | ISO7093 | |
| M3.5 | 3.7/3.9 | 6.7/7 | 0.45/0.55 | DIN433 | ISO7092 |
| 3.7/3.9 | 6.7/7 | 0.4/0.6 | BS4320A | ||
| 3.7/3.9 | 7.7/8 | 0.45/0.55 | DIN125A | ISO7089 | |
| 3.7/3.9 | 10.6/11 | 0.7/0.9 | DIN9021 | ISO7093 | |
| M4 | 3.7/3.9 | 6.7/7 | 0.45/0.55 | DIN433 | ISO7092 |
| 3.7/3.9 | 6.7/7 | 0.4/0.6 | BS4320A | ||
| 3.7/3.9 | 7.7/8 | 0.45/0.55 | DIN125A | ISO7089 | |
| 3.7/3.9 | 10.6/11 | 0.7/0.9 | DIN9021 | ISO7093 | |
| M5 | 5.3/5.5 | 8.7/9 | 0.9/1.1 | DIN433 | ISO7092 |
| 5.3/5.5 | 9.7/10 | 0.7/0.9 | BS4320B | ||
| 5.3/5.5 | 9.7/10 | 0.9/1.1 | DIN125A | ISO7089 | |
| BS4320A | |||||
| 5.3/5.5 | 12/12.5 | 0.9/1.1 | BS4320C | ||
| 5.3/5.5 | 14.6/15 | 1/1.4 | DIN9021 | ISO7093 | |
| 5.5/5.8 | 9/10 | 0.8/1.2 | DIN126 | ISO7091 | |
| M6 | 6.4/6.6 | 10.6/11 | 1.4/1.8 | DIN433 | ISO7092 |
| 6.4/6.6 | 11.6/12 | 1.4/1.8 | DIN125A | ISO7089 | |
| 6.4/6.7 | 12/12.5 | 0.7/0.9 | BS4320B | ||
| 6.4/6.7 | 12/12.5 | 1.4/1.8 | BS4320A | ||
| 6.4/6.4/ | 13.6/14 | 0.7/0.9 | BS4320D | ||
| 6.4/6.7 | 13.6/14 | 1.4/1.8 | BS4320C | ||
| 6.4/6.7 | 17.6/18 | 1.4/1.8 | DIN9021 | ISO7093 | |
| 6.6/7 | 11/12 | 1.3/1.9 | DIN126 | ISO7091 | |
| M8 | 8.4/8.6 | 14.6/15 | 1.4/1.8 | DIN433 | ISO7092 |
| 8.4/8.6 | 15.6/16 | 1.4/1.8 | DIN125A | ISO7089 | |
| 8.4/8.7 | 16.6/17 | 0.9/1.1 | BS4320B | ||
| 8.4/8.7 | 16.6/17 | 1.4/1.8 | BS4320A | ||
| 8.4/8.7 | 20.5/21 | 0.9/1.1 | BS4320D | ||
| 8.4/8.7 | 20.5/21 | 1.4/1.8 | BS4320C | ||
| M10 | 10.5/10.8 | 17.6/18 | 1.4/1.8 | DIN433 | ISO7092 |
| 10.5/10.8 | 19.5/20 | 1.8/2.2 | DIN125A | ISO7089 | |
| 10.5/10.9 | 20.5/21 | 1/1.45 | BS4320B | ||
| 10.5/10.9 | 20.5/21 | 1.8/2.2 | BS4320A | ||
| 10.5/10.9 | 23.5/24 | 1/1.45 | BS4320D | ||
| 10.5/10.9 | 23.5/24 | 1.8/2.2 | BS4320C | ||
| 10.5/10.8 | 29.5/30 | 2.3/2.7 | DIN9021 | ISO7093 | |
| 11/11.5 | 18.8/20 | 1.7/2.3 | DIN9021 | ISO7091 | |
| M12 | 13/13.3 | 19.5/20 | 1.8/2.2 | DIN433 | ISO7092 |
| 13/13.4 | 23.5/24 | 1.4/1.8 | BS4320B | ||
| 13/13.4 | 23.5/24 | 2.3/2.7 | BS4320A | DIN125A | |
| ISO7089 | |||||
| 13/13.4 | 27.5/28 | 1.4/1.8 | BS4320D | ||
| 13/13.4 | 27.5/28 | 2.3/2.7 | BS4320C | ||
| 13/13.3 | 36.4/37 | 2.3/2.7 | DIN9021 | ISO7093 | |
| 13.5/14 | 22.8/24 | 2.2/2.8 | DIN126 | ISO7091 | |
| M16 | 17/17.3 | 27.5/28 | 2.3/2.7 | DIN433 | ISO7092 |
| 17/17.3 | 29.5/30 | 2.7/3 | DIN125A | ISO7089 | |
| 17/17.4 | 29.5/30 | 1.8/2.2 | BS4320B | ||
| 17/17.4 | 29.5/30 | 2.7/3.3 | BS4320A | ||
| 17/17.4 | 33/34 | 1.8/2.2 | BS4320D | ||
| 17/17.4 | 33/34 | 2.7/3.3 | BS4320C | ||
| 17/17.3 | 49.4/50 | 2.7/3.3 | DIN9021 | ISO7093 | |
| 17.5/18 | 28.8/30 | 2.4/3.6 | DIN126 | ||
| M20 | 21/21.5 | 33.4/34 | 2.7/3.3 | DIN433 | ISO7092 |
| 21/21.5 | 36/37 | 1.8/2.2 | BS4320B | ISO7091 | |
| 21/21.5 | 36.5/37 | 2.7/3.3 | DIN125A | ISO7089 | |
| 21/21.5 | 36/37 | 2.7/3.3 | BS4320A | ||
| 21/21.5 | 38/39 | 1.8/2.2 | BS4320D | ||
| 21/21.5 | 38/39 | 2.7/3.3 | BS4320C | ||
| 22/22.5 | 35.5/37 | 2.4/3.6 | DIN126 | ISO7091 | |
| 20/20.6 | 54/56 | 3.4/4.6 | DIN9021 | ISO7093 | |