O-Rings are one of the most common types of seals in the world. With an unlimited number of possible manufacturing sizes, they are used various applications across industries. These round mechanical seals keep gas or liquid from passing through an opening but over time, they may wear out and require replacement. If you’re planning to replace an O-ring, a good fit is critical for successful sealing.
Below are the steps to take to properly measure for a new or replacement O-Ring.
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. Lightly clamp the jaws of the caliper onto the O-ring, but do not compress it. Record the thickness of the ring (the cross-section, see image for reference).
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