Rotary Shaft Seals

Rotary shaft seals are the more formal name for this type of seal; however, we also know them as oil, grease, fluid, or dirt seals. Whatever you call them however, they all perform the same function – to close the space between stationary and moving parts in machinery...

Silicone O Rings

As a leading O ring UK manufacturer and supplier of high quality seals and gaskets, offering a wide range of types, sizes, and sealing solutions that suit various applications across all industries, we work hard to ensure you get the best sealing solution for your...

Viton O Rings

Viton o rings bring with them numerous advantages, especially for applications within high-tech and critical industries. Providing great resistance to wide fluctuations in temperature and chemical ranges as well as being wholly suitable for pressure applications,...

How are O Rings made?

O rings are one of the most common components within manufacturing. Suitable for a range of applications and found in numerous everyday appliances, o rings are a vital piece of equipment to provide the perfect sealing solution. Ring-shaped seals, o rings are made up...

Pipe Gasket

A pipe gasket is designed to seal a space between two sections of a pipe. Many pipes have flanged surfaces where they join, which means it isn’t smooth or flat to make this connection secure. In order to overcome this flared area, a flange gasket will be used to...

Spiral Wound Graphite Fill Gasket

With so many different gasket options on offer today, we know it can be difficult deciding which ones have the right features for your needs. Each type of gasket is suitable for a variety of applications or uses, and the material that your gasket is made from will...

Gasket Cutting

Using the latest technology and equipment, gasket cutting today offers incredible precision. Achieving customised gaskets that meet your sealing requirements, today we’re now seeing various gasket cutting techniques used as we move away from the standard dimensions...

What are Bonded Seals?

As you start to compare the seals on offer on our site, you’ll find that there are many different options for a variety of uses. Bonded seals are a great solution for some applications, offering many benefits over other types of seals. Specialist Sealing Products...

Rubber Gasket Material

Rubber gaskets are a very valuable solution for a variety of uses, however, you’ll want to make sure you always choose the right option for your unique business operations. There are a variety of rubber gasket materials on offer, which provide you with an effective...

Installation of Spiral Wound Gaskets

Spiral wound gaskets are crucial in the prevention of leaks. Used across various industries, we know that spiral wound gaskets can provide the perfect sealing solution.  We also understand that your ultimate goal when working with gaskets is to ensure they fit...

See our latest catalogue for all the services we offer.

Oil Seal Types

We can’t emphasise enough how important it is to choose the right oil seal to keep your application functioning, and functioning well.

Not every oil seal is the same. Manufactured using various material elastomers and to suit a range of dimensions, seals are as unique as the application they are intended for.

However, oil seals do all aim to perform the same function – to prevent leaks and stop contamination entering the application.

These seals also typically have a single or double lip, and the most common materials used in the makeup of these types of sealing products include Nitrile, Viton, or rubber.

What is Oil Seal Types and its importance

Seals and Gaskets

Helping to close (seal) the gap between stationary and moving parts, oil seals prevent leaks and stop contamination due to the flexible lip rubbing against the shaft as it rotates.

The DIN is the standard that specifies a seal’s dimensions, requirements for materials, use and installation, and more.

Therefore, helping to find the right seal for the intended application, all seals and gaskets come with a unique coding system to help identify the type of seal and its features and properties. This is necessary to allow you to choose the correct seal and to record what seals work best in certain applications.

The most popular types of oil seals that we see are the single lip 21 and the double lip 23.

A single lip seal is what contains the oil, grease, or lubricant. Primarily, it does exactly what it is intended to do as an oil seal. A standard oil ring will consist of a metal ring as the inner to provide stability, with the spring on the lip providing additional support and preventing leaks from occurring.

A double-lip seal is a seal that has an additional rubber lip to prevent dust or dirt from entering the shaft, increasing the seal’s longevity. This second additional layer will feel like a ridge along the inner diameter at the top of the seal itself, ultimately providing extra protection.

Type of Oil Seals

The most common types of oil seals are rubber or metal cases.

Rubber-cased seals (A) = an excellent sealing solution encompassing a rubber-covered lip seal, with the oil seal fully enclosed. This type of oil seal is the most popular as it provides great thermal resistance, as well as temperature and chemical resistance. Often used when metal-cased seals have the potential to fail, this type of seal can’t rust, provides a tight fit as it is fast expanding, and can seal even when housing is slightly damaged.

Metal-cased seals (B) = a seal with a metal outer diameter; this type of seal is suitable for more standard applications. As the metal is exposed on one side, you can achieve a closer fit; when used with the same material application, it can provide equal contraction and expansion, and this type of seal can be more cost-effective than rubber seals. However, these seals should be used cautiously as they aren’t suitable for sealing thin liquids or gases.

C = with a reinforced metal insert, similar to seal type B, this seal has the extra benefit of an additional inner case, making it incredibly robust. Often found in heavy-duty machinery or equipment that requires a larger-size sealing solution.

F = a seal that operates as a stainless-steel garter spring, with a similar design to seal type A, but with the added benefit of a metal case that provides corrosion protection; this type of seal is most suitable for a range of fuels and chemicals. Connected at each shaft end to create a circular shape, garter springs help maintain the radial force around a shaft’s surface.

R = a rubber seal with a carbon steel insert and a rubber outer; this type of seal provides an effective sealing solution; with press fitting, it can also provide static sealing and comes with a good lifespan.

Bearing isolators = a dynamic seal that offers protection from a range of external contaminants.

Seal Specifications

There are various lip materials available for oil seals, some of the most common:

  • EPDM
  • Nitrile
  • Fluorosilicone
  • Fluoreslastomer
  • Polychloroprene
  • Natural Rubber
  • Stainless Steel
  • And so much more.

Installation of oil seals depends on the seal aim, direction, intention and also placement within the shaft and housing itself.

You will also need to consider dimension requirements. For example, inner and outer diameters, diameter of the housing, seal thickness, cross sections, and more.

Then, there are also service limits such as application operating speed, applied pressure, vacuum rotation, fluctuating temperatures, external influences etc.

Sealing products

There are various types of oil seals to fit a range of applications, and it’s vital that you find the right oil seal for you.

For specific requirements, speak to a member of the SSP team today, call 01535 274 776, or email your requirements to; we’d be happy to help.


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