O-Ring Guide

Everyone who works in the industry is surrounded by them, but many may still question what exactly an O-Ring is, what they do, and what makes them different from other types of seals. What makes them different from other types of seals?

O-rings are seals that are used to protect equipment and ensure its proper operation and come in a wide variety. They come in different sizes and can be made from a variety of materials through a variety of processes, including molding or extrusion. However, they all serve the same basic purpose. o-rings serve to seal the connection of two pieces to ensure that no air, gas, or liquid can pass through. Typically, they are installed in a groove and designed to resist pressure.

The resistance is what prevents air or liquid from escaping or entering the joint. Whenever two parts of a machine are joined together, there is a danger that some liquid – water, oil, or other substance – will seep out from where the two edges intersect. In some cases, even the passage of air can affect the pressure inside the pipe and thus endanger the function of the machine.

In cases where the two connections are round, such as pipes, O-rings are the solution. A properly installed ring will ensure that nothing escapes from the joint and nothing enters. Joints can be the weakest point in a machine, and it is critical to protect them with a high-quality O-ring made of a substance suitable for the application.

PYG-type End-face Sealing Ring

PYG-type End-face Sealing Ring

O-rings are the most widely used seals in the industry because they offer amazing value. They are inexpensive and very effective. They are also very versatile. They are suitable for both static and dynamic applications. If you are buying these seals, be sure to ask about the material of the O-ring before you buy. They are made from a variety of elastomeric materials suitable for different environments and temperatures, and it is important to choose one that is made from a material that is suitable for the application.

O-rings are ideal for static applications such as piping, cylinders, flanges, and plates. Their static applications include industrial and personal use. In addition to machinery, they can be used for cameras, refrigerators, diving gear, and even taps at the local bar.

O-rings are solid rubber, ring-shaped seals used to stop the passage of gases or liquids when pressed between two mating surfaces.

PY-type End-face Sealing Ring

PY-type End-face Sealing Ring

They are one of the most widely used seal designs in the world. Because of the many ways they can be used, there are essentially countless O-ring sizes.

However, despite the wide range of O-ring sizes, every O-ring has the same two dimensions: the inside diameter (ID) and the cross section (CS). In order to obtain an adequate seal, it must achieve proper compression with a cross-sectional characteristic of approximately 18-20%. This creates a boundary to prevent fluid entry and contaminant ingress.

Various ID size ranges for O-Rings have been developed around standard inch fraction sizes. This sizing system is referred to as the AS-568 sizing standard. For those looking for Japanese Standard Sizing (JIS), download the JIS O-Ring Sizing Guide here. There is also a standard metric sizing system and a DIN sizing system. This applies to standard industrial hardware shaft and hole sizes.

P-type Plain Washer End-face Sealing

P-type Plain Washer End-face Sealing

O-ring bore stretch levels are application dependent.

Another factor related to O-Ring sizing is the cross-section. The proper cross-sectional design depends on the size of the gland. To ensure the proper amount of squeeze required for adequate sealing, the O-ring cross section needs to be larger than the height of the gland.

The “radial gap” is the clearance between the two mating hardware surfaces, also known as the extrusion gap. o-ring extrusion focuses on the extrusion gap and sealing.

Depending on whether the application is static or dynamic, there are important differences in determining the size of the O-Ring cross-section. For dynamic applications, a smaller cross-section is required.

JIANKE offers O-Rings for a variety of industries. If you would like to learn more about O-Rings, please contact us.