- The choice of material for a metal-to-oil seal depends on the specific requirements of the application. Some of the most commonly used materials include
- Nitrile Rubber (NBR): This is the most frequently used material for sealing elements, boasting good heat resistance properties and resistance to salt solutions, oils, hydraulic oils, and gasoline. Its recommended operating temperature range is from -40 to 248°F (-40 to 120°C). Nitrile functions adequately in a dry environment but only for intermittent periods.
This is almost similar to that of ‘A’ type seal. But this has the metal case placed outside. When the housing is rough, temperature is high and working conditions are severe, this type is preferred
Rubber or rubber fabric
- In addition to preventing oil leaks, motor oil seals also help to keep out dirt, water, and other contaminants that could cause damage to the engine. By creating a tight seal, these seals ensure that the engine remains clean and protected from harmful particles that could affect its performance.
- One of the key advantages of radial oil seals is their ability to adapt to variations in shaft speed and diameter. The flexibility of the lip allows it to conform to changes in the shaft, ensuring a tight seal even when the shaft is not perfectly straight or has slight variations in diameter. This makes radial oil seals highly effective in a wide range of operating conditions.
- Rubber or Elastomeric Sealing Lip: The sealing lip typically encloses the shaft in a tight seal formed of rubber or elastomeric material.
- In the engine, oil seals are crucial for preventing oil from leaking out of the crankshaft, camshaft, or other moving parts. Without these seals, oil leakage can lead to damage to the engine, decreased performance, and increased maintenance costs. Similarly, in the transmission, oil seals prevent the leakage of transmission fluid, which is essential for the proper functioning of gears and other components.
The rubber material used in the oil seal should be selected based on the operational temperature and substance to be sealed.
Table 5 lists the major rubber materials along with their operational temperature ranges.
Note that it is necessary to check the compatibility with fluids.
<N.B.>
Extreme pressure additives are compounds added to the lubricant. They are activated by heat and chemically react against rubber, which deteriorates rubber properties. For this reason, it is necessary to check for compatibility with rubber materials.Type 6
Box: If a BX appears at the end of the part number, that oil seal will be in a box.
Clean sediment out of the sump with petrol and a stiff brush . Dry with a lint-free cloth.
Without minor lip
Type code
• Rubber material
• Seal type, etc.

oil seal 50 * 72 * 10.