- Lastly, the 7% signifies the recommended maximum allowable radial deflection for an oil seal
- An oil seal, also known as a lip seal, is a mechanical device designed to prevent the passage of oil or other fluids while allowing the rotation or linear movement of shafts and axles. The Oil Seal 20 34 7, with its specific dimensions of 20mm inner diameter, 34mm outer diameter, and a 7mm width, is tailored to fit various applications where precise sealing is required.
Seals, including oil seals, have undergone a great development in recent years and are totally unlike the original product. PTFE has taken over the oil seals market for modern engines mainly because traditional oil seals started causing more and more problems. Such as evaporation of chemical plasticisers from the elastomeric material, which eventually caused engine oil leakage. Now, the focus is more on durability and frequency of servicing.
Ensuring Proper Installation and Maintenance


Figure 4: JTEKT oil seal features
The most common oil seals are the ERIKS types R, RST, M and MST, which correspond respectively to types A, AS, B and BS according to DIN 3760/ISO 6194.
Before installing the oil seal, it is important to lubricate it to reduce friction and prevent damage during installation. A silicone-based lubricant is recommended for most applications. If the oil seal is to be installed in a high-temperature or high-pressure environment, a more specialized lubricant may be required.
Construction of an Oil Seal
