Types of Flanges

Businesses in a variety of industries rely on flanges to join pipes or components together or to keep equipment secured to a surface. When it comes to choosing the best types of flange for your processes, you’ll want to take the time to research the different options...

Threaded Flange

Threaded flanges are probably the most recognisable of all flanges due to their screw thread design that is used to connect it to the pipe. Threaded flanges, also known as screwed flanges (for obvious reasons), require a male and female thread to create a connection...

Slip On Flange

A slip-on flange can also be known as a hubbed flange, which, as the name suggests, has a hub with a very low profile. Why is this important? Because this type of ring type joint gasket has an internal diameter larger than the connecting pipe, allowing you to slide it...

Weld Neck Flange

Also known as tapered hub flanges or high hub flanges, weld neck flanges are a specific type of gasket with a protruding ridge and long neck used to connect pipework and provide you with a high-quality seal. Weld neck flanges, in particular, are a popular choice when...

Nitrile vs Viton® – What is the Difference?

As you start to make a decision about what type of O-rings to purchase for your business, you might wonder what material is the most suitable for your unique needs. Every business operation has different requirements for their O-rings, such as the temperature,...

Aflas vs Viton

When it comes to choosing O ring suppliers in the UK, you’ll find that there are a wide range of materials on offer for you to choose from. Many people find that the options can seem quite overwhelming, with some materials having similar properties but offering...

EPDM Gasket

Both the automotive and construction industries have started to use EPDM gaskets more frequently in recent times. This rubber material is UV light resistant and has many fantastic properties that make this part highly effective for a wide range of processes. Keep...

Metal Gaskets

When comparing gaskets for use within your business processes, you’ll find that these can be made from a variety of materials. Metal gaskets are a very popular option, offering many advantages over other materials. When looking at sealing product options, make sure...

AFLAS o ring

O rings come in many different dimensions, thicknesses, and materials. And it is the various different materials that o rings can be manufactured from that make each o ring unique and suitable for specific applications. In fact, there are hundreds of different types...

O Ring Vulcanization Process

With years of o ring knowledge and experience in o ring vulcanization, we're one of the leading experts in providing the right sealing solution for you. To view our full range, visit our O-ring product page, with a wide selection and something to match every...

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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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