The Importance of O-Rings in the Automotive Industry

September 2, 2022 – by Eastern Seals

An O-ring, or a toric joint, is a gasket with a circular-looped design and is used to seal two operating surfaces. For example, the valve stems in automobile engines use O-rings to keep oil from finding its way to the combustion chamber.

An O-ring helps create an air-tight lock between the valve guide and the valve stem. In the absence of this small and simple contraption, the oil could leak into the valve guide.

O-rings have revolutionised the automotive industry and are an important part of the sector. In this post, we look at some of the applications of O-rings in the automotive industry.

Importance of O-Rings in the Automotive Industry

O-rings are used to create a barrier to ensure a gas or liquid does not escape. The O-ring is typically placed into a groove for a secure placement before being compressed between the two surfaces. When the O-ring is squeezed, there’s no space for it to move, blocking the pathway of the gas/liquid you want to secure.

When the system experiences pressure, the O-ring gets squeezed against the groove’s opposite wall, ensuring an excellent seal no matter how high or low the pressure. O-rings are made of materials that are naturally springy and tend to return to their original shape.

When the pressure eases, the O-ring springs back to its original position, still maintaining a seal and ready for the next pressure cycle.

  • Braking Circuits – The braking system is one of the most important systems of an automobile. The fluid used inside a braking circuit is a glycol-based synthetic oil, which ensures consistent performance. It’s important to ensure the system stays efficient in all types of temperatures ranging from –40°C to 150°C. An O-ring is used here to ensure optimum performance no matter the temperature while handling pressure variations in the circuit. It must do all of this without modifying itself.
  • Lubricant Circuits – When it comes to lubricating transmission systems and engines, mineral oils with different levels of additives are typically used. The fluid’s temperature varies with usage. Again, O-rings must bear extreme temperatures and pressure levels. O-rings made of different materials such as FPM, NBR or ACM are used depending on the temperature the O-ring must endure.
  • Air-conditioning Systems – This is another important area in the automotive industry where O-rings play a crucial role. The gaseous fluids circulating inside an air conditioner undergo various states depending on the part of the circuit they are in and the temperature. O-rings play a crucial role in ensuring they remain in the designated area without flowing into areas the gases are not supposed to flow into.

Eastern Seals – One Stop Shop for Automotive O-Rings and More

Online store

We are one of the largest suppliers of British Standard, Metric series O-rings and sealing solutions.

Visit Store Now

Eastern Seals (UK) Ltd
Unit 3 Sovereign Business Park
Jubilee Industrial Estate
Ashington | Northumberland
NE63 8UG

+44 (0) 1670 840529
Contact us


If you have any queries, or would like any more information,
don’t hesitate to get in touch


Generic filters
Exact matches only
Filter by Custom Post Type