Place the O-ring on a clean, flat, level surface. Determine the inside diameter by using a ruler to measure from one inner edge to another. Use a ruler to measure the diameter, from one outer corner of the O-ring to the other outer corner. Finally, measure the cross-section. Place the O-ring into a vernier caliper.. An O-ring is a mechanical gasket that prevents the leakage of fluids or gases between two mating surfaces. It acts as a barrier, creating a seal that prevents the escape or entry of substances. O-rings are commonly used in hydraulic systems, pneumatic systems, automotive engines, and other industrial applications.

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Here is how to properly measure an O-ring: Place the O-ring on a level, flat, and clean surface. Determine the CS by measuring the thickness of the O-ring. Determine the ID by measuring from one inner edge to the other inner edge. Determine the OD by measuring from one outer corner to the other outer corner. Tolerances.. Ensure that you measure the CS at the thickest point of the O-ring. If the O-ring is not circular, take multiple measurements to get an accurate average. Calculate the O-ring's cross-sectional area: To calculate the O-ring's cross-sectional area, use the formula πr², where "r" is the radius of the O-ring. To get the radius, divide the CS by 2.