Imperial O-Rings

Imperial O-Rings are circular sealing components manufactured to imperial sizing standards, commonly measured in inches rather than metric dimensions. These seals are designed to fit between two mating surfaces to create a secure barrier against liquids, gases and pressure loss. Imperial O rings are commonly used across industries where older equipment, American-standard machinery or imperial-sized components are present. Manufactured from materials including NBR, FKM, HNBR, PTFE and AFLAS®, imperial O-rings provide excellent resistance to oils, fuels, chemicals and high-pressure environments depending on the material selected.

There are many types of imperial O-rings available to suit different sealing requirements and operating conditions. Common material options include NBR70 for general-purpose oil and hydraulic applications, NBR90 for higher pressure systems, FKM for chemical and high-temperature resistance, and PTFE for aggressive media and low-friction applications. Customers can purchase individual seals in a wide range of imperial O ring sizes or choose an imperial O ring set for workshops, engineers and maintenance teams requiring multiple sizes in one collection. An imperial O ring kit is also a practical solution for on-site repairs and servicing, ensuring commonly used sizes are always readily available.

Imperial O-rings are used across a broad range of industries including automotive, oil and gas, manufacturing, hydraulics, pneumatics and heavy engineering. Their ability to provide dependable sealing performance makes them ideal for pumps, valves, cylinders, compressors and pipe fittings. In oil and gas environments, specialist imperial O-rings such as FKM95 AED variants are used in high-pressure applications where resistance to explosive decompression is required. Imperial O ring kits are commonly used by maintenance engineers and technicians who require quick access to multiple seal sizes during servicing and emergency repairs.

Choosing the correct imperial O-ring depends on several important factors including seal size, operating pressure, temperature range and media compatibility. Selecting the appropriate imperial O ring size is essential for achieving an effective seal and preventing leaks or premature wear. Material selection is equally important, with NBR suited to oils and fuels, FKM ideal for high temperatures and chemicals, and PTFE offering superior chemical resistance. For maintenance teams and workshops, an imperial O ring set or imperial O ring kit can provide a convenient and cost-effective solution for covering a wide range of sealing applications. Swan Seals offers an extensive range of imperial O-rings and specialist sealing solutions to support industrial, hydraulic and engineering requirements