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The commonly used EPDM O-ring sizes are as follows:

Inner diameter (mm): 1.8, 2, 2.3, 2.7, 3, 3.4, 3.7, 4, 4.6, 5.1, 5.6, 6.1, 7.1, 8.1;

Wire diameter (mm): 1.2, 1.5, 1.8, 2, 2.3, 2.6, 2.8, 3, 3.4, 3.7, 4, 4.5, 4.9;

Outer diameter (mm): 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12;

Thickness (mm): 1.5, 1.8.

The above data is for reference only. There is no unified international standard for the measurement method of O-ring specifications, and the specifications and dimensions of O-rings produced by different manufacturers may vary slightly. The specific dimensions and specifications need to be customized to the manufacturer according to actual needs.