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The following is a general size table for silicone O-rings. It should be noted that the actual size may vary slightly depending on the manufacturer, batch, or specific application.

The outer diameter of silicone O-ring with a wire diameter of 1.0 is generally between 3 and 100;

The outer diameter of silicone O-ring with a wire diameter of 1.2 is generally between 3.5 and 100;

The outer diameter of a silicone O-ring with a wire diameter of 1.5 is generally between 3.8 and 150;

The outer diameter of a silicone O-ring with a wire diameter of 1.8 is generally between 5 and 150;

The outer diameter of silicone O-ring with a wire diameter of 2.0 is generally between 5 and 150;

The outer diameter of a silicone O-ring with a wire diameter of 2.5 is generally 7-150;

The outer diameter of silicone O-ring with a wire diameter of 2.65 is generally between 7 and 100;

The outer diameter of silicone O-ring with a wire diameter of 3-5 is generally 9-150.