Determine the CS by measuring the thickness of the O-ring.Place the O-ring on a level, flat, and clean surface.Here is how to properly measure an O-ring: If it does not match, then the odds are good that you have a metric O-ring. If your CS matches one of the standard AS586 sizes (such as 0.70”, 0.103”, 0.210”, etc.) then your O-ring is most likely a standard size. For larger IDs over 6”, it is best to use an O-sizer or Pi-Tape for precise measurements.Īll O-rings either come in metric (mm) or standard (inch) sizes. If you do not have these tools, you can use any measuring tool that you have available a caliper or micrometer will be more accurate. The outside diameter (OD) is good to note but is a non-critical measurement. The best way to size an O-ring is to measure the cross-section (CS) as well as the inside diameter (ID) of the O-ring with a caliper or micrometer. Sizing an O-ring isn’t tricky, but it is crucial that you are precise. Knowing how to properly size an O-ring is important to avoid O-ring failure and avoid wasting time and money. If the O-ring is too small, overstretching it to fit it into place will compromise the O-ring’s integrity and can cause it to fail. If the O-ring is too large, fluids, gasses, dirt, water vapor outgassing under vacuum, and more will flow around it. As you know, O-rings are used to create an impenetrable seal. Determining the exact size of an O-ring is one of the more challenging parts of ordering O-rings for your application.
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