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The Vital Guide to Tube Inserts BannerWelcome to the Vital Parts guide to Tube Inserts. Your number one source of information regarding measurements, uses, variations and sizing all found on one page. This guide is aimed to educate you on some of the most common uses of these components, when to use them, as well as how to measure them to ensure you make the best decision every time.

Tube Inserts, Tube Fittings or even Tube End Caps as they can be referred to are a hugely popular product inside many industries and feature as a finishing component inside a majority of consumer products from office appliances to school furniture.

When to use Tube InsertsInserts Finishing Off Tube Ends

  • To finish off a tube or pipe

A widely popular use for these Inserts is for finishing off a tube, pipe or post. As a simple to fit option these are often a go to part for general finishing uses, requiring just a tap to fit each insert comes with ribs which flex to hold it in tightly once installed. Commonly used with metal tubing these can add a sleek, discrete finish.

  • For use as feet with tubular chairs or furniture

Another hugely popular use for these fittings is their use as chair or furniture inserts, slotting into the end of a chair or furniture leg to act as a base/foot. This can produce many benefits such as added grip and stability whilst preventing marked floors thanks to the nonabrasive plastic used. Most frequently used with tubular school chairs our inserts cater specifically for these uses.

  • To protect the internal section

Protecting the internal section of a tube, pipe or post is an often overlooked benefit that these inserts can provide. Easily fitting into the end of your required application these promote a solid structure and provide an air tight fitting when measured properly, this prevent ingress of daily factors such as water, dust etc. Often used with posts these inserts work to pro-long the life of your application.

  • To add a function

Adding a function to a tube is a common use for our inserts, with many different variations available specifically for this. Adding a function to a tube is frequently done through installing some form of threaded insert, this allows for the attachment of external threaded components or even to join two tubes/pipes together.

Why use these Inserts

There are many different reasons as to why you may choose to use Tube Inserts over other alternate solutions, from ease of use to the quality of finish they provide, below are some of the main reasons to use them.

Easy to fit - In comparison to most other solutions these are an extremely easy to fit product, only requiring lining up with the tube before tapping it into position. Each insert comes with ribs to provide a secure fitting and to prevent the need for additional fasteners or adhesives.

Cost effective – As a whole, these inserts are a relatively cost effective part that don’t require too much manufacturing time hence their availability in a huge number of sizes. Therefore it makes sense to use these over potentially more expensive solutions such a stopper or plug.

Huge range of variants and sizes – Due to the huge amount of uses that Tube Inserts are employed for we keep a massive number of sizes and variants in stock to enable us to provide you with the product you require.

How to measure Tube Inserts

When looking to measure Tube Inserts it is essential to have a good idea of the exact measurements that are required, as well as what it is that you are actually measuring. This is both important for a secure fit and a reliable finish/function. Below we have split up some of the key measurements that need to be taken:Outside Diameter inserts guide image

Please refer to the image for a visual representation.

Outside Diameter
Finding the outside diameter (OD) of a tube can be done by measuring the distance between the two outer lips of your application, the distance between them being the OD.
 Internal diameter inserts support image

Internal Diameter
The second step to finding your tube measurement is to find the internal diameter (ID) of your tube, this is done in a similar way to OD however the measurement is taken from the distance between the two inner lips rather than the outer.

Wall ThicknessWall Thickness inserts support guide
Now that you have the two main measurements of your tube you can start to work out the wall thickness that you will require for a secure fitting, this measurement is found by using the following equation:

OD – ID ÷ 2 = Wall Thickness

Finally, once you have all 3 required measurements you can start to look for your required sizing, to do this you want to match up your tubes OD with our inserts OD as this will ensure it fits your tube. You will also want to make sure that the measurement that you came up with for wall thickness fits inside the range disclosed on the relevant insert page, for example if you have an insert with an outside diameter of 30mm and a wall thickness of 1-3mm then this will fit a tube that has a 30mm OD but has a wall thickness between 1 & 3mm.

Our Tube Inserts are able to fit across a range of tube diameters thanks to their flexible ribs which flex when pushed inside, working to hold it securely in place.

How to install Tube Inserts

Installation as displayed below is a quick and simple process, requiring just a tap with your hand or a hammer to provide a tight and secure fitting. Due to the ribbed nature of this product these hold inside the tube without the need for fixings, fasteners or adhesives.

Fitting your insert

Fitting your insert resource

What’s available for Tube Inserts?

Our range of Tube Inserts features a variety of standard and bespoke products to suit a wide number of uses from finishing off a tube to connecting two together. To get a better understanding as well as to give an overview of each range that we offer, we have split them up below into their main categories, outlining their main features, uses etc.


Plastic Inserts are one of the most cost effective fitting options that we provide, coming in the widest range of shapes and sizes to fit a variety of tube, post or pipe styles. Often employed as furniture inserts or to finish off a tube these are a common solution.Plastic tube inserts range image


Threaded Inserts are unique in the sense that they allow for the attachment of male threaded components to a tube, post or pipe. Available in a range of female metric thread sizes and variants between M6 & M20 these are another popular product inside our inventory.


Spring Inserts are a form of threaded insert that are most frequently used with metal tubing, each insert coming with springs rather than ribs that help to hold it in position, getting tighter in place when pulled. Often used to connect two tubes or to attach threaded components, these are a high performance product.Spring Threaded Inserts image example


For our full range of Tube Inserts, Threaded Inserts & Spring Inserts please click here. 

For any custom enquiries, problems or questions related to these inserts then please feel free to contact us or give us a call on 01233 713581.


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