CS Centrifugal Seal – Protection Against Dust and Water

If dust and water get inside a bearing, this leads to premature failure. Therefore choosing the right protective seals is important for the working life of a stainless steel bearing unit. The centrifugal seal (CS) is designed for harsh conditions where there is a risk of contamination.

Extreme Bearing has developed the centrifugal seal to solve these problems! Many Extreme Bearing housings feature centrifugal seals specially developed to repel dirt and contaminants using centrifugal force generated by the shaft. The CS seal works for speeds up to 5 m/s and for temperatures from -25°C up to 95°C.

CS seals are superior against sand, dirt and detergents

1. Double Lip Centrifugal Seal - Primary barrier using centrifugal force
2. Grease-filled Housing - Secondary barrier preventing contamination ingress
3. 2-RS Bearing Seal - Tertiary protection integrated into bearing

Firstly, the centrifugal seal made of rubber attached to the shaft provides a primary barrier. Because it repels dirt and contaminants using the centrifugal force generated by the shaft. Secondly, the bearing housing is filled with grease to prevent contaminants from entering and damaging the bearing. Finally, there is a type of bearing seal called 2-RS to protect the bearing.

The grease passes the retaining edge through the lubrication channels under the stator ring and between the two sealing lips and stator ring. This makes sure that any dirt is flushed away. The clamping of the rubber rotor ring around the shaft means that the bearing can be assembled even on a shaft which has suffered light surface damage such as a groove.

• Centrifugal Force Protection - Uses shaft rotation to repel contaminants
• Double Lip Design - Enhanced sealing capability
• Self-Cleaning Action - Grease flow flushes away dirt
• Misalignment Tolerance - Eccentric movement capability
• Damaged Shaft Tolerance - Can seal on slightly damaged surfaces
• Speed Range - Up to 5 m/s
• Temperature Range - -25°C to 95°C
• Superior to Standard Seals - Outperforms AS/SA seals in harsh conditions

When applying the CS bearing labyrinth seal, it must be taken into account that it is not flush with the surface of the housing and expands the dimensions of the housing slightly:

• Dusty and abrasive environments
• Washdown applications
• High-pressure water spray areas
• Powder handling processes
• Detergent exposure
• Food processing plants
• Agricultural applications
• Mining and quarries
• Any environment where AS/SA seals fail prematurely

The CS centrifugal seal represents a significant advancement in bearing protection technology for harsh environments.

The list below shows the chemicals, fluids and gases against which the NBR (nitrile rubber) sealing element of AS, SA and CS seals is reliably resistant. A check mark in a temperature column means the seal can handle that medium at that temperature. Empty cells indicate that the medium is not recommended at that temperature — pick a higher-grade seal (FKM, silicone or PTFE) instead.

Indicative values based on industry compatibility charts (Parker O-Ring Handbook, Trelleborg, ERIKS). The end user is responsible for validating suitability for their specific application — concentration, pressure, mechanical stress and exposure time matter. When in doubt, contact Extreme Bearing for a tailored recommendation.