O-Rings 2019-01-10T16:01:22+00:00

The Highest Quality O-Rings Availability You Need Them

With one of the largest inventories of o-rings, cord stock, and related seals (square rings, x-rings, backup rings, and more) in North America, we’re committed to providing the right product at the right price to every customer. Our technical sales team is experienced and knowledgeable about o-rings and their application. Because of this, we provide customers with guidance that ensures the optimal solution.

Not sure what you need? Let us help

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Global O-Ring offers the full line of AS568 Size O-Rings in the following materials:

View our AS568 Size Chart for a full listing of all sizes and dimensions.

Standard Materials Durometer Color Material Designation
Aflas® 80 Black A80
Buna-N (Nitrile, NBR) 50 / 70 / 90 Black/White N50/N70/N90/WN70
EPDM (peroxide-cured) 70 Black E70
Fluorosilicone 70 Blue F70
HSN (HNBR) 70 / 90 Green/Black HSN70/HNBR90
Neoprene® 70 Black C70
Polyurethane 70 / 90 Clear U70/U90
PTFE (Teflon) 55-60 Shore D White TEF
PTFE Encapsulated Viton® 90-95 Clear/Black TEV
PTFE Encapsulated Silicone 85-90 Clear/Red TES
Silicone 70 Red/Rust S70
Viton® (FKM, Fluorocarbon) 75 / 90 Black/Brown V75/V90/BV75

What is an O-Ring?

An o-ring is a round, mechanical gasket designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. O-rings are one of the most common types of seals because they’re inexpensive, reliable and have simple mounting requirements. Since they are known as one of the most important elements of machine design, o-rings may be used in static applications, where little range of motion is required. O-rings may be used in dynamic applications, like rotating pump shafts and hydraulic cylinder positions, also.

Main Elements of an O-Ring:

A perfect fit every time…We carry thousands of o-ring sizes in our warehouse. And we’re ready to ship to you at a moment’s notice. Our o-rings are available in the full range of standard AS568 and metric sizes. Additionally, sizes are specified by the inside diameter (ID) and the cross section (CS) or thickness. Therefore, if the o-ring you need is not a standard AS568 or metric size, you’ll need either a vulcanized o-ring or a custom molded o-ring. All size options are available from Global O-Ring. (See O-ring size chart).


Material matters. Due to this, selecting an o-ring material for a specific application is dependent on many criteria, including: what’s being sealed, temperature range, pressure, dynamic or static service, desired service life, installation considerations, tolerances and many more. To learn which o-ring materials will work best in your application, review our Material Selection Guide.


Determining durometer isn’t hard.  The hardness of rubber compounds is measured by the Shore A durometer; the higher the durometer, the harder the compound. In addition, softer compounds stretch easier and seal better on rough surfaces. Harder compounds offer greater abrasion resistance and resistance to extrusion. To learn more about durometer, click here.


There’s more to o-rings than meets the eye. Specific color standards are routinely used to help visually identify the type of o-ring installed for certain industries. Because of this, we stock o-rings in the most common colors, materials and compounds. View our colors here.

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