A Comprehensive Guide to Selecting Custom O-Ring Supplier

A Comprehensive Guide to Selecting Custom O-Ring Supplier
4 min read

Selecting the appropriate O-rings is crucial. These are employed in sealing applications and are referred to as toric joints. As its name implies, O-rings have a round cross-section and a round, o-shaped design. These can be secured to the mating surfaces of passages that convey gases or liquids. Although they are all made of the same design, O-rings come in several varieties. When selecting O-rings from a reliable custom O-ring supplier, consider the following six factors.

PSI Rating

An O-ring's pounds-per-square (PSI) value indicates the maximum pressure it can bear without leaking. In sealing applications, O-rings are all utilized. Pipes, hoses, and other passages that transport pressurized materials are sealed on their mating surfaces by them. Ensure the O-rings you select have a high enough PSI rating to prevent leakage.

Internal Diameter

The internal diameter is something to take into account while selecting O-rings. The distance between an O-ring's two largest points is known as its internal diameter. In essence, it shows the size of an O-ring. For an O-ring to be used, its internal diameter must accommodate the openings it is used with. For example, if you want to seal a pipe with an O-ring, the internal diameter must be the same as the pipe. At a minimum, it won't fit without leaking if it's too large or too little.


A variety of materials are available for O-rings. There are those composed of rubber. Other O-rings are created from higher-quality materials, such as thermoplastic or polyethylene. Undoubtedly, the characteristics of various materials vary. They can all stop leaks in gases and liquids. Before deciding, examine the material and if O-rings are appropriate for your sealing application.

Cross Section

When selecting O-rings, be sure to look at the cross-section size and the internal diameter. What precise cross-section is it? If an O-ring is thick, its cross section shows that. A ring may be turned on its side, and its thickness can be measured to determine its cross-section. You should expect better protection against leaks with a wider cross-section. Thus, the cross-section still needs to allow for the passages utilized with it. When selecting O-rings, you must consider the cross-section to ensure they fit.


The operating temperatures that O-rings are exposed to have increased overall due to advancements in chemical processes and the efficiency of consumer goods like motors and electronics. There is also an increased necessity to use these devices in extremely cold situations.
O-rings made of various materials have been specially designed to perform effectively in various temperature conditions. Knowing its temperature range might aid the appropriate O-ring for a potential application.


A factor to keep in mind while selecting O-rings is their hardness. Typically, a Shore A Durometer is used to test hardness. The O-ring is comparatively soft when its hardness rating is 40 and comparatively hard when it is 90.


Choosing the appropriate O-rings is essential in successful sealing applications. The PSI rating, internal diameter, cross-section, material, temperature, and hardness are the six primary factors to consider when deciding if O-rings are suitable for a certain application. Furthermore, optimum performance is ensured by comprehending temperature requirements and selecting O-rings from reliable custom O-ring suppliers.
Sealing solutions will function more effectively if you carefully consider these factors and choose the right O-ring provider.

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