Oil Seals

Both oil seals and grease seals have a flexible lip that prevents fluids and dirt from leaking or coming through by rubbing up against a shaft or housing, To install it properly, the seal of the lip should be pointing towards whatever is being contained. Some grease seals and oil seals include a spring to help keep the lip touching the shaft. The orientation and direction of the sealing is an important consideration for oil seals and grease seals. The direction and orientation could be rod seal or internal, piston seal or external, symmetric seal, or axial seal. Rod or internal seals are radial seals. The seal is pressed into a housing bore with the sealing lip in contact with the shaft. This is also called a shaft seal. Piston seals are radial seals. In this case, the seal fits onto a shaft with the sealing lip in contact with the housing bore. V-rings are considered to be external lip seals. A symmetric seal is like its name suggests, symmetrical and works just as well as an internal or external seal. An axial seal will seal axially up against a machine or housing component.

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The type of seal for grease seals and oil seals can be an oil seal or another types.  An oil seal is also sometimes called a flexible lip, a radial lip, or a rotary shaft seal.  Grease and oi seals are utilized to keep lubricants or fluids in or keep them separate.  These type of seals are pretty much used only for rotary applications.   Some of the more common configurations would be single lip, double lip, triple lip, and also ones that have four or more lips.  Other type of seal choices would be the U ring or  the block vee ring, the V ring, labyrinth or clearance seals, and bearing isolators.  U ring or block vee ring seals are sometimes referred to as U-packings or Block Vee packings. National Oil Seal or National Oil Seals is a popular brand as well as Nok Oil Seals.