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 | |
Note: Due to the fact that fastening applications differ greatly, the above information is for guidance only and is correct to the best of our knowledge. The customer must satisfy themselves with the performance of the fastener and validity of the data. TR Fastenings will not be held responsible for any failure that may occur from the use of this information.