Bearing Isolator is a sealing component developed to protect the rolling bearings used in rotating equipment, replacing the conventional rubber lip seal. Its labyrinth structure resolves the sealing issues commonly seen with lip seals.
Conventional lip seals can wear the shaft surface and allow lubricant degradation, contamination, and moisture ingress. Bearing Isolator protects the bearing and shaft from these problems and effectively extends service life. Because the mating surfaces never make contact, there is no wear or contamination at the interface. With an FKM (Viton®) O-ring and a PTFE body offering excellent heat resistance, lubricity and strength, it is well suited to the harsh conditions of rotating bearing equipment.
Inner and outer labyrinth paths provide complete sealing performance.
No contact with the shaft during operation, so no torque or power loss occurs.
A light, simple structure makes installation and maintenance very easy.
Highly chemical-resistant materials suit a wide range of applications.
Available in standard sizes as well as custom, non-standard sizes with fast lead times.
Especially well suited to rotating equipment exposed to prolonged high humidity, dust, or moisture — such as cooling towers, wastewater treatment, and acid/alkali processing equipment.
| Component | Standard Material | Options |
|---|---|---|
| Seal | PTFE filler | FDA-compliant option available |
| O-ring | FKM (Viton®) | NBR, FDA, Silicone, FFKM available |
| Type | Structure | Material | Pressure | Temp(°C) | Speed(m/s) | Displacement |
|---|---|---|---|---|---|---|
| THBI-01 |  | PTFE/FKM | 0 | -40/120 | 25 max | 0.3mm |
| THBI-02 |  | PTFE/FKM | 0 | -40/120 | 25 max | 0.3mm |
| THBI-03 |  | PTFE/FKM | 0 | -40/120 | 25 max | 0.3mm |
| THBI-04 |  | PTFE/SUS/FKM | 0.3 | -40/120 | 25 max | 0.3mm |
Seal material | Standard: PTFE filler → FDA-compliant option availableO-ring material | Standard: FKM → NBR, FDA, Silicone, FFKM available
Contact us for the full dimensional spec sheet and technical catalog.
