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The job of an anti-extrusion ring

O rings perform an essential job supporting various applications. Creating a tight seal between the two housing parts that hold it, o rings help prevent liquids and gases from escaping from an application, preventing any detrimental harm and defects from occurring....

What Gaskets Are Best for High-Pressure Vessels?

When it comes to the choice of gaskets on the market today, it can feel quite overwhelming to know which is the right option to use alongside high-pressure vessels. The pressure in these types of vessels can be extremely dangerous and explosive when they are not...

O-Ring Squeeze Ratios – Everything You Need to Know

If you need to install an O-ring seal, you might be wondering what you need to know about squeeze ratios. Specialist Sealing Products offers a wide range of products for your needs, and we’ll be here to help you when selecting the right design and material for your...

Spiral Wound Gaskets and Their Use in the Power Generation Industry

Within the power generation industry today, there are constant challenges to face. Over the past decades, many changes have occurred in this industry, with different fuels used to produce energy. In order to withstand the high temperatures and the conditions of this...

Shelf life of an o ring

It may seem a surprising topic of conversation, but when it comes to o rings and seals, it's important to note that they do have a shelf life, which, if not monitored and regularly checked, can affect their quality and overall performance.  How and where you store...

What are Encapsulated O-Rings?

When discussing the various o-ring options on offer, you might hear encapsulated o rings being discussed. This type of o-ring offers many advantages to manufacturers, but you’ll want to ensure you understand its proper application before purchasing...

Everything You Need to Know About Large O-Rings

Large O-rings, which are often referred to as giant o-rings, are used in a wide variety of applications. They are primarily needed for jobs where heavy machinery or equipment are used, but you’ll find there are a variety of options on the market when choosing large...

How to Avoid Pipeline Flange Corrosion

Our team is all too aware of the risks of corrosion, but it’s something that you can work to avoid in your home and workplace. Preventing corrosion isn’t always an easy task, which is why it’s such a common problem within buildings in the UK. Visit our homepage for...

O-rings suitable for the pharmaceutical industry

O rings are widely used across various industries to support a variety of different pieces of equipment and applications.  They provide an essential function and are ultimately moulded and manufactured to ensure they provide a continually high level of quality through...

The Best Chemical Resistant Gaskets for Sulfuric Acid

If you are using sulfuric acid on a regular basis within your industry, you might be aware of how corrosive it can be. While it can be useful for dyes, explosives, fertilisers, and many more applications, finding a chemical resistant gasket can often be one of the...

O-ring Size Guidelines

O-ring Size GuidelinesThe performance of an O-ring seal depends largely on two factors the right material and the right size. However, determining the right size O-ring is usually the hardest part when it comes to choosing the right O-ring for an application.  

Unfortunately, selecting the right O-ring size is paramount to avoid leakage and other costly damages that may occur in the long run.  Additionally, If you’re unsure what O-ring size you need, you’ll have a difficult time purchasing an O-ring that will work for your application.  

So, here’s a guide that will help you size an O-ring properly.  

Measuring O-ring Cross Section and Inside Diameter 

To identify the right O ring sizes for your application, you need to know the required cross-sectional (CS) diameter and the inside diameter (ID). The CS can be best measured using a calliper, but you can also get a close estimate using any other sizing tool.  

When it comes to measuring the ID, it is advisable to use a calliper for very small IDs and a Pi-Tape or O-Sizer for larger IDs. Once you’ve determined the CS and ID, you can use an O-ring size chart to determine if the dimensions correspond with the recommended O-ring size for your application. 

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Understanding O-ring Sizes and Tolerances 

O-rings are normally described by either standard (inch) or metric (mm) dimensions. There normally exists some variance in the O-ring dimensions as a result of manufacturing limitations. These variances are referred to as tolerances.  

Aerospace Standard AS568B defines standard O-ring sizes. The CS of these O-rings range from 0.040 to 0.275 inches, and their ID range from 0.029 to 25.940 inches.  

Metric O-ring sizes, on the other hand, are defined by International Standard ISO 3601-1, which classifies metric sizes into two categories, G and A. The G series O-rings are available in a wide range of ID and are ideal for general purpose applications. The A series O-rings, on the other hand, are ideal for aerospace applications, which require tighter tolerances.  

Choosing the Right Cross-sectional Diameter 

Generally, O-rings with a larger CS offer better resistance to compression set. Moreover, they have less volume swell in fluids and won’t leak easily if their surface is scratched.  

Orings with smaller CS boast superior physical properties. They also can resist explosive decompression better than their larger CS counterparts. Moreover, these O-rings are more space-efficient. 

When it comes to dynamic applications, you would want to go for O-rings with large CS as they are more resistant to rolling in a groove. Smaller CS O-rings will normally slide and roll in a groove, resulting in leakages due to the ring’s spiral failure.  

Now that you have some knowledge of O-ring size selection, you can go shopping for your O-rings at Specialist Sealing Products, one of the leading O-ring suppliers in the UK. The company offers a wide range of high-quality O-rings. For more information on O-rings and other sealing products offered by Special Sealing Products, click here 

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