Tolerances for Metric O-Rings

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Due to the fact that there are literally dozens of O-Ring standards globally, finding a single recognized standard for metric O-Ring tolerances is virtually impossible. After extensive research, we have adopted the tolerances shown in the following table, which are based in ISO 3601-1, Class B, Annex A.4. For those sizes not specified in this table, please contact our Customer Service Department, or use the following formula to calculate ID tolerances:

Tolerance = ± [ (ID x 0.95 x 0.009) +.011 ]

CROSS SECTION TOLERANCES (mm)
0. 0 0  to  1. 8 0  ±  0 .0 8
1. 8 1  to  2. 6 5  ±  0. 0 9
2. 6 6  to  3. 5 5  ±  0. 1 0
3. 5 6  to  5. 3 0  ±  0. 1 3
5. 3 1  to  7. 0 0  ±  0. 1 5

Inside Diameter Tolerances (mm)
I.D. Tol. ±
1.80 to   2.50 0.13
2.51 to   4.50 0.14
4.51 to   6.30 0.15
6.31 to   8.50 0.16
8.51 to   10.00 0.17
10.01 to   11.20 0.18
11.21 to   14.00 0.19
14.01 to   16.00 0.2
16.01 to   18.00 0.21
18.01 to   20.00 0.22
20.01 to   21.20 0.23
21.21 to   23.60 0.24
23.61 to   25.00 0.25
25.01 to   26.50 0.26
26.51 to   28.00 0.28
28.01 to   30.00 0.29
30.01 to   31.50 0.31
31.51 to   33.50 0.32