X-rings, also known as Quad-rings or Q-rings, are elastomer seals with a characteristic X-shaped cross-section and four sealing lips. This design allows the ring to sit more securely in the groove and reduces the tendency to roll or twist during movement. X-rings are therefore particularly suitable for dynamic sealing applications.
X-rings are available in different materials, sizes and hardnesses. Common materials include NBR, EPDM and FKM/Viton. View the current X-ring range.
An X-ring is a ring-shaped elastomer seal with a four-lobed cross-section. When installed in a suitable groove, several sealing lips make contact with the surrounding surfaces. This distributes the sealing pressure across multiple contact zones.
The profile also gives the ring a more stable position in the groove than a conventional round seal. This is particularly important in applications involving movement, because the risk of rolling or twisting during sliding motion is reduced.
The characteristic advantage of an X-ring is its four sealing lips. These create several contact areas with the sealing surfaces. Small spaces between the lips can retain lubricant, which can help reduce friction in moving applications. Depending on the groove, material and operating conditions, X-rings can be used for both static and dynamic sealing.
The shape of an X-ring offers several advantages compared with a standard round seal. The profile sits more securely in the groove and is less likely to twist during movement. This can help reduce damage caused by torsion.
An X-ring can also often operate with less compression than a comparable round seal, which may help reduce friction. The four sealing lips and the spaces between them contribute to stable sealing performance.
X-rings are therefore widely used in technical systems where low friction, good stability and reliable sealing are important.
During sliding movement, a round seal can start to move within the groove under certain conditions. This can cause the seal to roll or twist, potentially damaging the surface and resulting in leakage. The X-shaped cross-section provides a more stable position and is therefore useful in applications involving frequent reciprocating movement.
By distributing sealing pressure across several contact zones, an X-ring can operate with relatively limited preload in suitable applications. This can result in lower friction than with a comparable round seal. The spaces between the sealing lips can also retain lubricant, provided that the lubricant is compatible with the elastomer and the medium.
X-rings are used in a wide range of technical and industrial applications. They are particularly useful in systems where a seal must accommodate movement without rolling inside the groove. Typical applications include hydraulic cylinders, pneumatic cylinders, pumps, valves, pistons, piston rods and shafts.
Depending on the construction, X-rings can be installed in both radial and axial sealing arrangements. They can also be used in certain static connections where the four-lobed profile offers advantages.
In a dynamic seal, a component moves relative to the sealing ring. Examples include a reciprocating piston rod or rotating shaft. In these applications, the stable position of the X-ring can be an important advantage. The ring is less likely to twist, while the spaces between the lips can retain lubricant.
Wear can therefore be reduced when the groove, surface finish and lubrication are correctly matched to the application.
X-rings can also be used in static connections where there is no relative movement between the sealing components. Examples include certain covers, flanges and bushes. Whether an X-ring is the most suitable choice depends on the groove, pressure, temperature, medium and available installation space.
An O-ring has a round cross-section, while an X-ring has a four-lobed cross-section. Both types of seal are used to prevent leakage of liquids and gases, but their different profiles result in different operating characteristics.
In a static application, an O-ring can often provide a simple and reliable sealing solution. When regular movement is involved, an X-ring can offer advantages because it is less likely to roll in the groove and has several sealing lips. Lubricant can also remain between these lips.
An X-ring can be an interesting choice when twisting, friction or dynamic movement are important factors. This does not mean that an X-ring is automatically better than an O-ring. The correct choice depends on groove dimensions, pressure, speed, temperature, medium and the overall construction. In an existing design, always check whether the groove is suitable for the selected profile.
The material largely determines where X-rings can be used. Common elastomers include NBR, EPDM and FKM/Viton. Each material has its own properties in terms of temperature resistance, chemical compatibility, wear resistance and mechanical strength.
O-Ring-Stocks offers standard X-rings in NBR, EPDM and FKM. View the available X-rings in different materials and sizes.
NBR X-rings are widely used in applications involving mineral oils, greases and hydraulic fluids. NBR offers good mechanical properties and wear resistance, making it a common choice in hydraulics, mechanical engineering and general industrial applications. Exact suitability depends on the compound, temperature and medium.
EPDM is used in applications involving hot water, steam and certain chemicals. The material also offers good resistance to ozone, ageing and weathering. EPDM is generally unsuitable for many mineral oils, greases and fuels, so always check compatibility with the medium before selecting an EPDM X-ring.
FKM X-rings are commonly used at higher temperatures and in contact with various oils, fuels and chemicals. FKM, often known by the brand name Viton®, generally offers higher temperature and chemical resistance than many standard elastomers. Exact properties vary by compound and application.
A commonly used version is the NBR X-ring in 70 Shore A. This combination provides a good balance between flexibility, wear resistance and mechanical strength. NBR 70 Shore A is widely used in industrial sealing applications involving mineral oils, greases and hydraulic fluids.
O-Ring-Stocks offers a large range of standard X-rings in this material and hardness combination.
X-ring dimensions are specified by the inside diameter and cross-section. Examples include 18.72 x 2.62 mm and 26.58 x 3.53 mm. The required size is determined by the groove and construction. View the current range of NBR X-rings 70 Shore A to compare available sizes.
When selecting an X-ring, first determine the correct dimensions. Check the inside diameter, cross-section and groove dimensions. The material must then be matched to the medium and operating temperature.
Pressure, speed, type of movement and required hardness also play a role. Particularly in dynamic applications, the ring should have sufficient preload to provide reliable sealing without creating unnecessary friction.
Use the X-ring webshop to search different sizes, materials and hardnesses. Looking specifically for a widely used nitrile version? View the NBR X-rings 70 Shore A. Always check whether the material and dimensions match the technical application.
An X-ring is an elastomer sealing ring with a four-lobed, X-shaped cross-section. This creates four sealing lips. The profile allows the ring to sit securely in the groove and reduces the tendency to roll or twist during movement. X-rings can therefore be used for both static and dynamic applications.
An O-ring has a round cross-section, while an X-ring has four sealing lips. This makes an X-ring less likely to twist in the groove and can provide advantages in dynamic applications. Lubricant can also remain between the sealing lips. Which seal is most suitable depends on the construction and application.
X-rings are used in hydraulic and pneumatic cylinders, pumps, valves, pistons, piston rods and shafts. They are particularly useful when movement is involved and a stable seal is required. X-rings can also be used in certain static connections.
The correct material depends on the medium, temperature and application. NBR is widely used with mineral oils and greases, EPDM with water, steam and weathering, and FKM with higher temperatures and various oils, fuels and chemicals. Always check the full material specification before selecting an X-ring.
70 Shore A indicates the hardness of the elastomer. This hardness is commonly used for general industrial seals and provides a combination of flexibility and mechanical strength. Higher pressures or specific constructions may require a different hardness.
Yes. X-rings can offer particular advantages in dynamic applications. The four-lobed profile helps reduce rolling and twisting inside the groove, while lubricant can remain between the sealing lips. Groove dimensions, lubrication, surface finish and material must all be correctly matched.
The O-Ring-Stocks X-ring webshop offers different sizes, materials and hardnesses. For a commonly used version, you can also view the NBR X-rings 70 Shore A.
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