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How to accurately measure the specifications of O-rings?

by:DMS Seals     2021-04-04


How to accurately measure the specifications of O-rings?



The O-ring is only composed of a piece of elastic steel band, and its two ends are respectively engraved with main ruler and subsidiary ruler. The minimum graduation value of the main ruler is 0.5mm and the minimum graduation value of the subsidiary ruler is 0.05mm.



O-rings measure the diameter through the circumference, so the scale error during production is reduced by π times and reflected in the measurement result. The indication accuracy of the pie rule (π ruler) above φ500mm is higher than that of the same specification vernier calipers, and the larger the diameter, the higher the indication accuracy.










Seal ring inner diameter measuring ruler, O-ring inner diameter measuring ruler is convenient for measurement:



O-ring inner diameter measurement: When measuring, place the measured part on a table or glass plate, roll the π ruler to be smaller than the inner diameter of the measured circle, and place it in the circle with the help of a measuring accessory magnetic column. A certain thrust is applied, and when the π ruler is attached to the tested part, the vernier principle is adopted for reading, and the average inner diameter of the tested O-ring can be directly and accurately read without conversion.



O-ring outer diameter measurement: When measuring, place the measured part on a table or glass plate, and roll the π ruler to be larger than the outer diameter of the measured ring. When the π ruler is attached to the measured part, use Vernier principle reading, without conversion, you can directly and accurately read the average outer diameter of the tested O-ring (the reading value minus two feet thickness).



I hope that the above content can help you understand the O-ring better. If there is anything you don’t understand, you can directly communicate with our customer service. We will serve you wholeheartedly and thank you for watching.


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