Oil Seals and Grease Seals Information

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Oil Seals and Grease Seals

Oil seals and grease seals have a flexible lip that rubs against a shaft or housing to prevent the leakage or ingress of fluids and dirt.

For proper installation, the seal lip should point towards the medium being contained. Some oil seals and grease seals have a spring to help keep the lip in contact with the shaft.

Oil and grease seals are used to retain or separate lubricants or fluids. These seals are primarily used for rotary applications only.


The seal type for oil seals and grease seals can be oil seals or other types. An oil seal can also called flexible lip, radial lip, or rotary shaft seal. Common configurations include single lip, double lip, triple lip, and four or more lips.

Bearing Isolator

Oil Seals and Grease SealsBearing isolators are dynamic seals designed to protect bearings from outside contaminants. They are comprised of a rotor (rotating) and stator (stationary) member. Some bearing isolators are of labyrinth construction while others use O-rings or other positive seals.

Other types of oil seals and grease seals include:

  • Single lip oil seals
  • Double lip oil seals
  • Metal cased
  • All rubber or polymer
  • Internal orientation
  • External orientation
  • Axial orientation
  • Spring-energized


Common specifications include sealing orientation, construction parameters, dimensions, service limits and lip materials.

Sealing Orientation

The sealing orientation and direction is important to consider for oil seals and grease seals.

  • Rod seals, also referred to as shaft seals, are radial seals. The seal is press-fit into a housing bore with the sealing lip contacting the shaft.
  • Piston seals are radial seals. The seal is fit onto a shaft with the sealing lip contacting the housing bore. V-rings are considered external lip seals.
  • A symmetric seal is symmetrical and works equally well as a rod or a piston seal.
  • An axial seal seals axially against a housing or machine component.

Construction Parameters

Oil Seals and Grease SealsImportant seal construction parameters to consider include metal casings, and dual lip elements.


  • Shaft outer diameter or seal inner diameter
  • Housing bore diameter or seal outer diameter
  • Axial cross section or thickness
  • Radial cross section

Service Limits

  • Maximum operating speed
  • Maximum operating pressure
  • Vacuum rating
  • Operating temperature

Lip Materials

  • Ethylene acrylic
  • EDPM
  • Fluoroelastomer
  • Fluorosilicone
  • Nitrile
  • Nylon or polyamide
  • Polychloroprene
  • Polyetheretherkeytone
  • Polyoxymethylene
  • Polytetrafluoroethylene
  • Polyurethane
  • Urethane
  • Natural rubber
  • Sintered bronze
  • Cast iron
  • Stainless steel
  • Felt
  • Leather

Many seal manufacturers use their own proprietary material. Consult with manufacturer for proprietary material specifications.


Common features for oil seals and grease seals include spring loaded, integral wiper, and split seal.


FORD ESE-M8G66-A - Oil seal, polyacrylic rubber

MIL-S-21558 - Oil seals, plain or plain encased

Image Credits:

SKF/North America | KC Seals, Inc. | Daemar Inc.

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Related Products & Services

  • Back-up Rings

    Back-up rings or anti-extrusion rings are washer-like devices used to prevent seals from extruding through gaps while under pressure. Seals are installed in the downstream side of the gland.

  • Bearing Isolators

    Bearing isolators are dynamic seals designed to protect bearings from outside contaminants.  They are comprised of a rotor (rotating) and stator (stationary) member.

  • Dynamic Seals

    Dynamic seals include oil seals, hydraulic and pneumatic seals, exclusion seals, labyrinth seals, bearing isolators, and piston rings. They create a barrier between moving and stationary surfaces in applications such as rotating shafts and pistons rings.  This is a general search form; more detailed search forms are available.

  • Exclusion Seals

    Exclusion seals are comprised of wipers, scrapers and V-ring seals.

  • Hydraulic Seals and Pneumatic Seals

    Hydraulic seals and pneumatic seals include piston seals, rod seals, U-cups, vee, cup, and flange packings.

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