Product type
JFK sealing systems
Reliable sealing for every operating condition
Sealing rings, O-rings, and NILOS rings: the complete range for retaining lubricants and protecting against contaminants.
JFK sealing systems include sealing rings (oil seals), O-rings, and NILOS rings designed to prevent the leakage of lubricants and fluids while protecting internal components from contaminants. Made from NBR, FKM/Viton®, PTFE, and other elastomers, they cover a wide range of operating conditions in terms of temperature, pressure, and type of movement.
Not sure which type is the right choice for you? The "Selection guide" section at the bottom of this page will help you identify the best solution for your application. Alternatively, contact us directly for technical assistance.
JFK sealing systems include sealing rings (oil seals), O-rings, and NILOS rings designed to prevent the leakage of lubricants and fluids while protecting internal components from contaminants. Made from NBR, FKM/Viton®, PTFE, and other elastomers, they cover a wide range of operating conditions in terms of temperature, pressure, and type of movement.
Not sure which type is the right choice for you? The "Selection guide" section at the bottom of this page will help you identify the best solution for your application. Alternatively, contact us directly for technical assistance.
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Three types for every sealing requirement
The three types differ in the type of movement to be sealed and the component on which they are mounted. Sealing rings are designed for rotating shafts, O-rings for static or dynamic applications, and NILOS rings are mounted directly on bearings.
O-rings
Circular cross-section · Static and dynamic applications · Compact design Circular-section sealing elements, also known as O-rings, for hydraulic and pneumatic applications, with a compact design suitable for limited spaces and high pressures.
Nilos rings
Bearing sealing · Contaminant protection · Lubricant retention Sealing rings mounted directly on bearings to protect them from dust and external contaminants while retaining the internal lubricant.TECHNICAL COMPARISON
Which sealing system for which application
Comparison by type of motion, application and mounting. Materials and operating pressure depend on the specific design.
| Type | Motion | Typical application | Mounting |
|---|---|---|---|
| Sealing rings | Rotary (shaft) | Motors, pumps, gearboxes | On shaft |
| O-rings | Static and dynamic | Hydraulics, pneumatics | In housing or groove |
| Nilos rings | Rotary (bearing) | Bearings | On the bearing |
SELECTION GUIDE
How to choose the right sealing system
The choice of sealing system depends on operating temperature, type of movement, chemical compatibility with the fluid, and operating pressure. Start with the condition that best describes your application.
Temperature range: -40°C to +120°C
NBR covers most standard industrial applications; for high temperatures, FKM/Viton® is the preferred choice, while PTFE is suitable for extreme operating ranges. Reciprocating motion and high pressure
O-rings provide reliable sealing even under internal pressure, which enhances their sealing effect, and are suitable for reciprocating movements. Their compact design also makes them suitable for applications where space is limited. Chemical compatibility with the fluid
The elastomeric material must be assessed on a case-by-case basis: the material in contact with the fluid must be selected on the basis of chemical compatibility: FKM/Viton® for aggressive oils, PTFE for the most extreme cases. Direct bearing protection
When protection is required directly on the bearing rather than on the shaft or in the housing, NILOS rings combine lubricant retention and contaminant protection, providing a dedicated sealing solution.Contacts
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