O-Rings & X-Rings

24/7 Emergency Delivery Available



CTG’s experienced engineers will custom tailor a seal to fit your exact requirements, and manufacture 1 or 1,000 seals to your specifications that same day.

O-rings are sized to the SAE standard AS568, which is known as a dash number. Metric O-rings are sized to the actual measured inside diameter. Custom sizes can be developed to suit your applications.

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  • High or low temperatures
  • High or low pressures
  • Static or dynamic systems
  • Corrosive environments

Provide a simple and effective seal that can be used for thousands of applications. O-rings are manufactured in an array of materials to match any design needs.

Quad Seal (x-ring):

These can be used in a wide variety of static and dynamic sealing applications. Quad Seals should be used when seal life is important. Quad Seals allow for a narrower gland over standard O-rings. These are well suited for use on high pressure and pulsating pressure applications.


  • Both types of seals provide a simple, inexpensive, and effective plug for many applications
  • A wide variety of forms and sizes
  • Fabricated from custom materials to meet the exact needs of the application
  • X-rings are ideal for dynamic and extreme pressure applications
  • O-rings with backup rings increase the effective pressure range of the O-ring

Design Principle


In dynamic applications, a seal can also fail by abrasion against the walls of the gland. In such situations, the walls should be polished to prolong the life of the seal.

为了为最大密封寿命,必须从正确的弹性体中构建密封件。CTG可以从耐受高温或低温,高压或低压,动态应用和腐蚀性环境的弹性体中建立密封。如果您不确定哪种材料最好,请问我们 - 我们可以帮助您为您的情况选择正确的材料。

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For emergency needs, 24/7 delivery is also available

The following table details the materials that are commonly used to construct our O-rings and X-rings. Customers sometimes ask about seals made from other materials. We can do that, too. Let us know the dimensions of the O-ring or X-ring that you need, and we will have your seals ready within a day.

Material Temperature Range(°F)* Comments and Typical Uses
Nitrile (Buna-N, NBR) -20 to 212 Highly resistant to abrasion and tearing.
Nitrile is the most commonly used elastomer for sealing applications,
and it is the material of choice for petroleum applications.
Hydrogenated nitrile (HNBR) -20 to 300 Compared to nitrile, HNBR has better chemical resistance, better heat
resistance, and better resistance to seal extrusion.
Ethylene-propylene (EPDM)
-60 to 250 Very resistant to ozone.
-40 to 250 Resists both weathering and exposure to petroleum oils
Butyl (isobutylene, IIR) -50 to 250 Extremely low gas permeability; resists a diverse range of chemicals.
Useful in applications requiring an air-tight seal.
Viton® (fluorocarbon, fluoroelastomer) -15 to 400 Better resistance to chemicals and high temperatures than most
other elastomers.
Silicone (VMQ, PVMQ) -150 to 400 Excellent tolerance for temperature extremes, and high resistance to
compression set.
Fluorosilicone (FVMQ, FK) -75 to 400 Tolerant to temperature extremes, and resists degradation by fuel and oils.
Primarily used where resistance to hot, dry conditions is required.
FFKM (perfluoroelastomer) -15年到600年 Highly resistant to many chemicals, and outstanding resistance to
high temperatures
PTFE -400 to 450 Highly resistant to many chemicals, and can function over a very wide
temperature range. Also resists weathering.

* Temperature ranges given here are approximate; the values relevant to any particular situation depend upon the application. If in doubt, ask us—we will help you design an O-ring or X-ring to meet the temperature tolerance needs of your system.

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24/7 Emergency Delivery Available
For urgent needs call800.299.1685