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Optimum squeezing force for an o ring

It is true that the more squeeze you place on an o ring, the tighter the seal it will provide. In essence, the more squeeze (compression) you apply, the greater the force between the o ring and its mating hardware.  And ensuring you have the perfect seal is all...

O Ring Squeeze

The squeeze and shrinkage on an o ring are vital to understanding as these factors stand in the way of your application either experiencing a perfect seal or your application suffering from leaks.  You can measure the shrinkage of an o ring during...

Keeping your o rings bonded

EMI o rings. Those seal ring gaskets are made of silicone compounds, combining environmental sealing with electromagnetic interference protection.  Consisting of metal or metal-coated particles, silicone o rings are filled with silver, silver aluminium, or nickel...

The importance of mechanical seals when reducing water consumption in mining

Environmental considerations are at the top of most industry's agendas in the 21st century as companies evaluate and improve operations, processes, and systems.  Conserving water in mining is one such area that is now being investigated further with the rotation of...

How choosing the correct gasket reduces risks

Health and Safety across any industry are vital, especially so in industrial facilities and settings.  Why?  Because harmful leaks and emissions must be avoided at all costs to avoid serious accidents or injury to your teams and property.  That’s why having the right...

How to tighten your bolts perfectly

How to tighten your bolts and which tools you should use to achieve the perfect seal is not as seamless and straightforward as we would like. Various factors come into play in these situations, such as bolt grade, size, and even application type.  Tightening torques...

Static and Dynamic o rings

A range of factors and application dynamics come into play when choosing a particular type of o ring.  You need to understand the type of seal exert you require, the dimensions, and even compounds.  Due to the nature of an o ring and its overall design, o rings use...

Gasket Sealants

Fortunately, no one gasket suits a range of applications, but rather we have a multitude of gasket sealants available to meet various specifications and requirements.  Ultimately, sealants are used to effectively ensure gasket seals.  Helping to extend a gasket's life...

Types of industrial gasket material

Different industry sectors will use different types of gaskets and different types of gasket materials.   And of course!  Different industrial gasket materials will be much better suited to some industrial processes and applications compared to others.  As different...

Keeping a close eye on the gaskets your applications use

Gaskets are vital elements to any piping system and application that requires creating the perfect seal in order to prevent leaks.  This is the main role of a gasket, to provide a good seal, with some gasket materials sealing better than others in certain...

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. 

Find Out More Here!

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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