O-Rings 2019-05-07T16:44:36+00:00

The Highest Quality O-Rings Available When 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.

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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.

 Common Compounds/Materials  Durometer (Shore A)   Color  Temperature Range (F) FDA Compliant Compound/Material Designation
(click material for data sheet)
Buna-N (Nitrile, NBR) 70 Black -40 to +212 No N70 
Buna-N (Nitrile, NBR) 90 Black -40 to +212 No N90
Viton® 75 Black -15 to +450 No V75
Viton® 75 Brown -15 to +450 No BV75
Viton® 90 Black -15 to +450 No V90
EPDM (peroxide-cured) 70 Black -67 to +257 No E70
Silicone 70 Red/Rust -76 to +437 Yes S70
Aflas® 80 Black -14 to +428 No A80
 Additional Compounds/Materials  Durometer (Shore A)   Color  Temperature Range (F) FDA Compliant Compound/Material Designation
(click material for data sheet)
Buna-N (Nitrile, NBR) 50 Black -40 to +212 No N50
Buna-N (Nitrile, NBR) 70 White -40 to +212 No WN70
Buna-N (Peroxide-cured) 90 Black -20 to +275 No N90PC
FKM RGD – Parker V1238 95 Black -15 to +400 No V1238
FKM RGD – V90RGD 90 Black +5 to +428 No N90RGD
FFKM (Perfrez) 75/80/90 Black Varies No P6001C/P9001C/P9021C
FFKM (Kalrez) 75/80/90 Black Varies No K4079/K6375/K1050LF
Fluorosilicone (FVMQ) 70 Blue -76 to +350 No F70
HNBR/HSN 70/80/90 Black -40 to +302 No HNBR70 /HNBR80 /HNBR90
HNBR/HSN 70/80/90 Green -40 to +302 No HSN70 / HSN80 /HSN90
Neoprene® 70 Black -40 to +212 No C70
Polyurethane 70/90 Clear -40 to +264 No U70 / U90
Silicone 50 Red/Rust -76 to +437 Yes S50
Silicone 60 Red/Rust -76 to +437 Yes S60
PTFE (Teflon) 55-60 Shore D White -328 to +500 Yes TEF
PTFE Encapsulated Viton® 90-95 Clear/Black -76 to +428 Yes TEV
PTFE Encapsulated Silicone 85-90 Clear/Red -76 to +428 Yes TES

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. (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.

Metric O-rings:

Global O-Ring and Seal offers a large selection of Metric O-Ring sizes in various compounds. A “Metric O-Ring” simply means that the size of the o-ring is defined in millimeters. Learn More.

Custom Molded O-Rings:

Beyond our huge inventory of more than 50 million o-rings in all standard materials and sizes, if you’re looking for a custom size o-ring for any cross sections larger than the AS568 400 Series (.275” CS) and/or an ID larger than the largest ID for that series, we’re your go-to provider. Learn More.

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