They are amongst the most widely utilized seal designs in the world. Due to the number of ways they can be utilized, there are essentially an endless number of O-Ring sizes.

But despite the wide range of O-Ring sizes, every O-Ring has the same two dimensions: the inner diameter (ID), and the cross-section (CS). To attain an adequate seal, it must achieve proper compression, approximately 18-20% in the cross sectional characteristic. This creates a boundary to keep fluids in and contaminants out.

The wide ranges of ID dimensions of O-Rings are developed around standard inch fractional sizes. This sizing system is referred to as the AS-568 sizing standard. There are also standard Metric and Japanese sizing systems. This accommodates standard industrial hardware shaft and bore sizes.

Levels of Inner Diameter stretch for O-Rings are application dependent. Consult a Gallagher engineer on your application so that all of the variables can be understood and the proper size can be specified.

Another factor related to O-Ring size is cross section. Proper cross section design depends on the size of the gland. To ensure the proper amount of squeeze needed for an adequate seal, the O-Ring cross section needs to be larger than the height of the gland.

The “diametrical clearance” is the gap between the two mating hardware surfaces, also known as the extrusion gap.

The O-Ring squeeze focuses on the extrusion gap and seals. There are crucial differences when identifying the size of an O-Ring cross section depending on whether the application is static or dynamic. With a dynamic application, a smaller cross section is needed.

The O-Rings provided by Gallagher Seals serve a number of markets, including the aerospace, chemical processing, energy and heavy equipment industries. Contact one of our engineers to learn more.

You can also download our complete guide to O-Ring design to learn more about O-Rings’ technical performance characteristics, materials, chemical and temperature compatibility, hardware considerations and failure modes.

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As the leading designer and manufacturer of rubber parts and seals, DESIOR Rubber has a wide range of products to meet all your sealing needs. From our vast o-ring inventory of virtually any shape and size to our complex, custom sealing solutions, we have precisely what you need for any sealing application.

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