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.

Flat Washer Standards
ThreadInside DiameterOutside DiameterThicknessStandards
M11.1/1.252.3/2.50.2/0.4DIN433BS4320A
M1.21.3/1.452.8/30.2/0.4DIN433BS4320A
M1.41.5/1.652.8/30.2/0.4DIN433BS4320A
M1.61.7/1.853.2/3.50.25/0.4DIN433ISO7092
1.7/1.853.7/40.25/0.4DIN125AISO7089
    BS4320A
1.8/2.053.25/40.2/0.4ISO7091ISO7092
M22.2/2.354.2/4.50.25/4DIN433
2.2/2.354.7/50.2/0.4DIN125AISO7089
    BS4320A
2.4/2.63.25/40.2/0.4ISO7091 
M2.52.7/2.854.7/50.45/0.55DIN433ISO7092
2.7/2.855.7/60.45/0.55DIN125AISO7089
2.9/3.25.3/60.4/0.6ISO7091 
2.7/2.856.2/6.50.4/0.6BS4320A 
2.7/2.857.7/80.7/0.9DIN9021 
M33.2/3.45.7/60.45/0.55DIN433SO7092
3.2/3.46.7/70.45/0.55DIN125AISO7089
3.4/3.76/70.4/0.6ISO7091 
3.2/3.46.7/70.4/0.6BS4320A 
3/3.28.7/90.7/0.9DIN9021ISO7093
M3.53.7/3.96.7/70.45/0.55DIN433ISO7092
3.7/3.96.7/70.4/0.6BS4320A 
3.7/3.97.7/80.45/0.55DIN125AISO7089
3.7/3.910.6/110.7/0.9DIN9021ISO7093
M43.7/3.96.7/70.45/0.55DIN433ISO7092
3.7/3.96.7/70.4/0.6BS4320A 
3.7/3.97.7/80.45/0.55DIN125AISO7089
3.7/3.910.6/110.7/0.9DIN9021ISO7093
M55.3/5.58.7/90.9/1.1DIN433ISO7092
5.3/5.59.7/100.7/0.9BS4320B 
5.3/5.59.7/100.9/1.1DIN125AISO7089
   BS4320A 
5.3/5.512/12.50.9/1.1BS4320C 
5.3/5.514.6/151/1.4DIN9021ISO7093
5.5/5.89/100.8/1.2DIN126ISO7091
M66.4/6.610.6/111.4/1.8DIN433ISO7092
6.4/6.611.6/121.4/1.8DIN125AISO7089
6.4/6.712/12.50.7/0.9BS4320B 
6.4/6.712/12.51.4/1.8BS4320A 
6.4/6.4/13.6/140.7/0.9BS4320D 
6.4/6.713.6/141.4/1.8BS4320C 
6.4/6.717.6/181.4/1.8DIN9021ISO7093
6.6/711/12   1.3/1.9DIN126ISO7091
M88.4/8.614.6/151.4/1.8DIN433ISO7092
8.4/8.615.6/161.4/1.8DIN125AISO7089
8.4/8.716.6/170.9/1.1BS4320B 
8.4/8.716.6/171.4/1.8BS4320A 
8.4/8.720.5/210.9/1.1BS4320D 
8.4/8.720.5/211.4/1.8BS4320C 
M1010.5/10.817.6/181.4/1.8DIN433ISO7092
10.5/10.819.5/201.8/2.2DIN125AISO7089
10.5/10.920.5/211/1.45BS4320B 
10.5/10.920.5/211.8/2.2BS4320A 
10.5/10.923.5/241/1.45BS4320D 
10.5/10.923.5/241.8/2.2BS4320C 
10.5/10.829.5/302.3/2.7DIN9021ISO7093
11/11.518.8/201.7/2.3DIN9021ISO7091
M1213/13.319.5/201.8/2.2DIN433ISO7092
13/13.423.5/241.4/1.8BS4320B 
13/13.423.5/242.3/2.7BS4320ADIN125A
    ISO7089
13/13.427.5/281.4/1.8BS4320D 
13/13.427.5/282.3/2.7BS4320C 
13/13.336.4/372.3/2.7DIN9021ISO7093
13.5/1422.8/242.2/2.8DIN126ISO7091
M1617/17.327.5/282.3/2.7DIN433ISO7092
17/17.329.5/302.7/3DIN125AISO7089
17/17.429.5/301.8/2.2BS4320B 
17/17.429.5/302.7/3.3BS4320A 
17/17.433/341.8/2.2BS4320D 
17/17.433/342.7/3.3BS4320C 
17/17.349.4/502.7/3.3DIN9021ISO7093
17.5/1828.8/302.4/3.6DIN126 
M2021/21.533.4/342.7/3.3DIN433ISO7092
21/21.536/371.8/2.2BS4320BISO7091
21/21.536.5/372.7/3.3DIN125AISO7089
21/21.536/372.7/3.3BS4320A 
21/21.538/391.8/2.2BS4320D 
21/21.538/392.7/3.3BS4320C 
22/22.535.5/372.4/3.6DIN126ISO7091
20/20.654/563.4/4.6DIN9021ISO7093

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.