O-Rings have three different measurements: inside diameter, outside diameter, and cross-sectional thickness.
Inside diameter (I.D.) is measured from one inner border to the other with a measuring device (ruler, measuring tape, PI tape, etc.)
Outside diameter (O.D.) is measured from the outer border to another with a measuring device. However, O.D. is not often used.
Cross-sectional thickness (C.S.) can be measured with calipers or a micrometer. Gently clamp the jaws of the device onto the O-ring to avoid warping it.
If the O-ring is not whole, measure the length of the of the O-Ring and divide by π (3.14159), then subtract the cross-sectional thickness.
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