encapsulated o-rings

Measuring an O-Ring is quite simple when you have the right tools at your disposal. All that is required is a clean, level surface; an o-ring; and a measuring device such as a caliper or other measuring tools such as cones, gauges, and size charts.

Directions to Measure an O-Ring

To measure an O-Ring, following the directions below:

1. Place your o-ring on a flat surface clean of debris.
2. Determine the inside diameter (ID) and outside diameter (OD) of the o-ring. The o-ring dimensions chart below illustrates where on the o-ring each dimension is measured.
3. Measuring the width, or cross-section (CS), can be tricky and is measured by lightly pressing the caliper ends onto O-ring as shown in section A-A.

For more information on O-ring sizes click to see the JIS B 2401 Standard O-Ring Size Tables.

Dimensionally specifying an o-ring can typically be done with just

FEP-/PFA-encapsulated O-rings combine the excellent chemical resistance of PTFE with the elastic behavior of an elastomer.

They are a top choice when the rubber-elastic quality of the seal is indispensable, but the application also requires better chemical resistance than traditional elastomers.  The Gallagher Engineering Department can determine if an FEP-/PFA-encapsulated O-ring is right for your specific application.

In this blog post, our partners at Freudenberg Sealing Technologies outline some of the advantages of encapsulated O-rings.