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There are generally two ways to label the dimensions of O-ring rubber: inner diameter and wire diameter.

In the old national standard, the outer diameter of the O-ring is represented by D, and the wire diameter is represented by d2. For example, the O-ring 20 * 2.4 II-2, where 20 represents the outer diameter of the sealing ring as 20mm, 2.4 represents the cross-sectional diameter of the sealing ring as 2.4mm, II-2 represents the type of rubber used for the sealing ring, and GB1235-76 represents the execution standard number.

In the new national standard (adopting ISO standard), the inner diameter of the O-ring is represented by the inner diameter, and the cross-sectional diameter is represented by the cross-sectional diameter. For example, the O-ring is 7.5 * 1.8-G-N, where 7.5 represents the inner diameter of the O-ring as 7.5mm, 1.8 represents the cross-sectional diameter of the O-ring as 1.8mm, and GB/T3452.1-2005 represents the execution standard number.

The above is the basic size representation method for rubber O-rings, but there are many different sizes and specifications in actual use. You need to choose the appropriate size and specification based on specific usage scenarios and requirements.