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Flange Gasket materials – What you need to know

Getting the most out of flange gasket materials and ensuring the performance of the gasket is not affected when you come to use it, means several things must be taken into consideration.  For example, factors such as their design, how they’re manufactured, installed,...

Spiral Wound Gaskets and Sheet Gaskets

Gaskets come in a range of different shapes and sizes.  All are offering similar functionality; gaskets are produced using a range of different materials to suit a range and a variety of environmental factors, industrial uses, and product requirements.  When it comes...

Benefits of Kammprofile Gaskets

Used to prevent leakage, gaskets are constructed to fit between a range of different sizes and types of surfaces in order to provide the perfect seal.  Typically used in pipes and heat exchangers, gaskets are widely used as industrial sealants.  Kammprofile gaskets,...

Purpose of a Kammprofile Gasket

The ultimate purpose of a gasket is to stop leaks while being able to deal with varying levels of compression.  When it comes to Kammprofile gaskets, these are ideal for standard pipeline and heat exchanger applications.  As due to their grooved metalcore, with a...

Are your gaskets completely compliant?

In industries where gaskets are not just important but essential, there are numerous challenges to be faced and considerations to take on board.  This is especially true when it comes to making sure this “essential” element is also compliant.  With the implementation...

Everything you need to know about Manway Gaskets

When it comes to manway gaskets, we want to keep things simple, introducing them as the small sealing ring found in hatches/openings that are constructed for large tanks. Openings which give people access to the inside of the aforementioned tanks and vessels. The...

Why Colour Matters When Choosing Gaskets?

Gasket manufacturers have turned to colour coding gaskets to make the selection and categorisation of the product more accessible.   It is possible to identify the winding and filler materials that were used for fabrication by the colouring of the outer top side of...

Choosing the Perfect Gasket for Your Needs

The perfect gasket choice and fit is an essential component of engines, appliances, and industrial machinery projects. They are a fundamental part when engineering anything from power tools to oil drills. A high-quality manufacturer of gaskets and seals will use only...

How Do You Recognise a Quality Gasket?

A gasket is a very simple item that is reasonably inexpensive. Considering how gaskets work, you may be facing a costly bill should a gasket fail. Choosing a quality gasket from Specialist Sealing Products helps to create a seal that will last until well after the...

5 Common Gasket Failures

When it comes to manway gaskets, we want to keep things simple, introducing them as the small sealing ring found in hatches/openings that are constructed for large tanks. Openings which give people access to the inside of the aforementioned tanks and vessels. 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. 

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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