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O-Rings

O-rings, often called toroidal seals, packing, or toric joints, are one of the most common seals used in machine design. That is because O-rings are inexpensive, easy to manufacture, reliable, and have simple mounting requirements. O-rings are produced either by extrusion, machining, injection moulding, pressure moulding or transfer moulding. As you will see from our comprehensive range below, O-rings are available in a vast range of standard O-ring sizes, specified by the inside diameter and the cross section diameter or thickness.

O-rings can be used for a wide range of applications and come under the seal category. You can buy O-rings from our new online store from a selection of 10,000 different sizes. O-rings are simply a looped elastomer with a circular cross section that sits in an O-ring grove. O-rings are designed in a way that, when forced into its intended groove, it deforms to ensure contact with the inner and outer walls of the gland, creating an exceptional seal at the interface.

As quality O-ring manufacturers, we can fabricate various O-rings, O-ring kits, large O-rings and specialised rubber O-rings, all in-house. We are also able to mould complex seals with an O-ring cross section.

Please view our handy guide, which details the preferred sizes from the accepted British, American, DIN, and European standards.

What types of O-ring material are available?

O-rings are renowned for their excellent sealing properties and are commonly used to stop air or liquids from seeping out of a given area. O-rings can be supplied in a range of O-ring materials, one of which is silicone. Silicone O-ring seals are widely used in high temperature settings, as they are able to withstand temperatures of up to 200°C.

Our wide selection of rubber O-ring materials includes:

  • Silicone
  • Nitrile (NBR)
  • EPDM
  • Viton (FKM)

Choose from our range of O-ring materials available to purchase from stock.

Where can O-rings be used?

Standard O-rings can be used in a number of applications. In circumstances where you are in a demanding environment, or have special performance requirements, we can also manufacture O-rings in a range of specialised materials.

At Monomer, we are more than happy to provide you with guidance on housing designs. If you would like to speak to one of our technical experts, please call us on 023 8022 6330. We can help you to choose housing designs for your specific application.

What O-ring sizes are available?

We have a range of O-ring sizes, available in both metric and imperial types. Our imperial O-ring sizes are supplied in BS1806 and our metric sizes are in BS4518.

What are O-ring cords and kits?

O-ring cord is useful if you require a certain length of extruded cord with an o-profile. We supply O-ring cord in all of our O-ring materials, in a range of lengths or coils. O-ring cord is often used as a static seal for when certain sizes are out of stock, unavailable or too expensive.

Our O-ring kits include a ready to fit set of parts for repair or OEM applications. These high quality O-ring kits contain a selection of hard-wearing, durable rubber O-rings. Our O-ring repair kits come in a handy organized box, for easy access at all times.

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  1. O-Ring Seals 443.36mm x 6.99mm

    Click to view material type and hardness within this range!
    Material:
    • FKM
    • Nitrile
    Hardness:
    • 70 A
    • 75 A
    BS Code:
    • BS 464
    £36.36

  2. O-Ring Seals 46.00mm x 1.50mm

    Click to view material type and hardness within this range!
    Material:
    • FKM
    Hardness:
    • 75 A
    BS Code:
    • BS 442
    £30.77

  3. O-Ring Seals 47.00mm x 2.00mm

    Click to view material type and hardness within this range!
    Material:
    • FKM
    • Nitrile
    Hardness:
    • 70 A
    • 75 A
    £9.09

  4. O-Ring Seals 47.00mm x 5.00mm

    Click to view material type and hardness within this range!
    Material:
    • Nitrile
    Hardness:
    • 70 A
    £15.38

  5. O-Ring Seals 5.00mm x 3.00mm

    Click to view material type and hardness within this range!
    Material:
    • FKM
    • Nitrile
    • Silicone
    Hardness:
    • 70 A
    • 75 A
    BS Code:
    • BS 368
    £7.69

  6. O-Ring Seals 5.28mm x 1.78mm

    Click to view material type and hardness within this range!
    Material:
    • FKM
    • EPDM
    • Nitrile
    • Silicone
    Hardness:
    • 70 A
    • 75 A
    BS Code:
    • BS 009
    £7.69

  7. O-Ring Seals 5.50mm x 3.00mm

    Click to view material type and hardness within this range!
    Material:
    • Nitrile
    • Silicone
    Hardness:
    • 70 A
    £7.69

  8. O-Ring Seals 55.00mm x 1.50mm

    Click to view material type and hardness within this range!
    Material:
    • FKM
    • Nitrile
    Hardness:
    • 70 A
    • 75 A
    £9.23

  9. O-Ring Seals 56.00mm x 8.00mm

    Click to view material type and hardness within this range!
    Material:
    • Nitrile
    Hardness:
    • 70 A
    £14.55

  10. O-Ring Seals 57.00mm x 2.00mm

    Click to view material type and hardness within this range!
    Material:
    • FKM
    • Nitrile
    • Silicone
    Hardness:
    • 70 A
    • 75 A
    £3.64

  11. O-Ring Seals 57.00mm x 4.50mm

    Click to view material type and hardness within this range!
    Material:
    • FKM
    • Nitrile
    Hardness:
    • 70 A
    • 75 A
    £13.64

  12. O-Ring Seals 75.80mm x 3.53mm

    Click to view material type and hardness within this range!
    Material:
    • FKM
    • EPDM
    • Nitrile
    • Silicone
    Hardness:
    • 70 A
    • 75 A
    • 90 A
    BS Code:
    • BS 234
    £11.54

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