O-Rings & Special-Shaped Seals

X-Rings

CORASEALS supplies X-rings and four-lobe elastomer seals for dynamic and static industrial sealing, with material and size options for reliable replacement.

Custom sizes, materials and profiles available
Reliable sealing performance under demanding conditions
Export-ready packing and documents

1. General Specifications

Parameter	Specification
Product Name	X-Rings
Alternative Name	Four-Lobe Seals / Quad-Rings
Seal Type	Elastomeric Sealing Ring
Cross-Section	X-Shaped / Four-Lobe Profile
Material Options	NBR / EPDM / FKM / Silicone (VMQ)
Sealing Applications	Static / Reciprocating / Selected Rotary
Dimensions	Inside Diameter × Cross-Section
Size Range	Standard and Custom Sizes
Hardness	According to Material Grade and Application
Color	According to Material Compound
Customization	Material, Dimensions, Hardness and Compound
Country of Origin	China
MOQ	Flexible — Subject to Specifications and Quantity

2. X-Ring Material Options

Material	Main Characteristics	Typical Applications
NBR	Resistance to many petroleum oils and hydraulic fluids	Hydraulic Systems / Pumps / Machinery
EPDM	Resistance to water-based media, ozone and weathering	Water Systems / Static Sealing
FKM	Resistance to many oils, fuels and chemicals	Industrial Equipment / Selected Chemical Services
Silicone (VMQ)	Good temperature flexibility; limited abrasion resistance	Selected Static Sealing Applications

3. Sealing Applications

Application Type	Description	Typical Equipment
Static Sealing	Sealing between stationary mating surfaces	Housings / Covers / Valve Connections
Reciprocating Sealing	Sealing in back-and-forth linear motion	Hydraulic & Pneumatic Cylinders
Rotary Sealing	Sealing in selected rotating arrangements	Shafts / Rotating Equipment
Custom Applications	Profile and material selected for specific requirements	OEM Equipment / Replacement Parts

X-Rings, also known as four-lobe sealing rings, are elastomeric seals with an X-shaped cross-section. Their four-lobe profile creates multiple sealing contact areas and offers an alternative to conventional O-Rings in selected static and dynamic sealing applications.

X-Rings are commonly used in hydraulic and pneumatic equipment, pumps, valves, cylinders and industrial machinery. Depending on the seal design and operating conditions, they can help reduce twisting and rolling within the groove while providing effective sealing performance.

X-Ring Design & Sealing Features

Four-Lobe Cross-Section

Unlike a conventional O-Ring with a circular cross-section, an X-Ring has four rounded lobes. This profile creates two primary sealing contact areas on each opposing sealing surface.

The recessed areas between the lobes can help retain lubricant in suitable dynamic sealing applications.

Reduced Twisting & Rolling

In reciprocating applications, conventional O-Rings may twist or roll within the groove under certain operating conditions.

The four-lobe profile of an X-Ring can improve stability and reduce the tendency to twist when the seal is correctly selected and installed.

Static & Dynamic Sealing

X-Rings can be used for static sealing between stationary components and for selected dynamic applications involving reciprocating or rotating movement.

Their suitability depends on groove dimensions, pressure, lubrication, surface finish, operating speed and material properties.

X-Ring Material Options

NBR (Nitrile Rubber)

NBR X-Rings are commonly used in applications involving petroleum-based oils, hydraulic fluids and lubricants. Their suitability depends on the specific fluid and operating temperature.

EPDM (Ethylene Propylene Diene Rubber)

EPDM X-Rings are used in selected water-based fluid systems and applications requiring good resistance to weathering and ozone. EPDM is generally unsuitable for petroleum oils and hydrocarbon fuels.

FKM (Fluoroelastomer)

FKM X-Rings are selected for applications involving many oils, fuels and chemicals, including certain elevated-temperature environments. Chemical compatibility must be checked for the specific fluid.

Silicone Rubber (VMQ)

Silicone X-Rings offer flexibility over a broad temperature range, depending on the compound. They are generally better suited to selected static sealing applications because their mechanical and abrasion resistance may be insufficient for demanding dynamic service.

Industrial Applications

X-Rings are used in a variety of sealing arrangements, including:

Hydraulic and pneumatic cylinders
Pumps and valves
Reciprocating shafts and pistons
Selected rotary sealing applications
Industrial machinery and equipment
Static sealing grooves and housings
Maintenance and replacement sealing parts

Sizes & Groove Compatibility

X-Rings are identified by their inside diameter and cross-sectional dimensions. Both measurements are important when selecting a replacement.

Although X-Rings and O-Rings may have similar nominal dimensions, they should not automatically be considered interchangeable. Groove geometry, compression, clearance and operating conditions must be checked before substitution.

For replacement applications, the existing seal dimensions, material and equipment requirements should be confirmed.

Standard & Custom X-Rings

CORA SEALS supplies X-Ring options for industrial distributors, equipment manufacturers, maintenance companies and sealing parts buyers.

Standard sizes and custom dimensions can be reviewed according to customer specifications, drawings or samples. Material selection and hardness requirements can also be specified according to the application.

Request a Quote

Please provide the required inside diameter, cross-section size, material, hardness and quantity. For replacement seals, existing part numbers, drawings or samples can help confirm the correct profile.

If the material is not specified, please include the operating medium, temperature, pressure and whether the application is static, reciprocating or rotary.

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