Check out this post, A Simple Guide to Selection an O-ring for more detailed information.Shop our selection of popular brand O-Rings, like Alfas, Buna, EPR, Viton, and more!.Record the thickness of the ring (the cross-section, see image for reference). Grab a piece of string (or dental floss if you dont have any string), and wrap it around the base of your finger. Lightly clamp the jaws of the caliper onto the O-ring, but do not compress it. Use a ruler to measure the diameter, from one outer corner of the O-ring to the other outer corner.Determine the inside diameter by using a ruler to measure from one inner edge to another.Place the O-ring on a clean, flat, level surface.Our printable size guides walk you through the steps, so you can be confident in the size you pick. If you’re planning to replace an O-ring, a good fit is critical for successful sealing.īelow are the steps to take to properly measure for a new or replacement O-Ring. Finding the right ring or bracelet size is easy. These round mechanical seals keep gas or liquid from passing through an opening but over time, they may wear out and require replacement. With an unlimited number of possible manufacturing sizes, they are used various applications across industries. O-Rings are one of the most common types of seals in the world. O-Ring Sizing Chart Standard O-Ring Size Chartĭownload the O-Ring Size Chart to view standard sizes (O-rings are measured in millimeters).ĭownload O-Ring Sizing Chart How to Measure O-Rings
