In general, it is difficult to measure the inner diameter of a short seal without a projector. The rectangular seals used in the introduction of our products are converted from English to metric. The inner diameter value marked on the drawing is often not an integer, but has a decimal number, such as φ158.8, φ107.4, φ85.3. To this end, it is more difficult to verify whether the outer diameter of an externally machined rectangular seal meets the requirements of the pattern. This problem has been solved by designing a special gauge as shown in the figure. Now by way of example, the design usage principle is introduced as follows.
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