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Tube Inserts

We supply a huge selection of Tube Inserts, Plastic Inserts & Tube End Caps to suit each use that you may have, from our standard plastic styles to metal threaded ones. Inserts like the variations seen below are regularly used to ‘cap’ or ‘plug’ the end of a tube, hence the name ‘Tube End Cap’ which is what these products are often referred to within consumer industries. Offering long term protection against ingress and leakage to the internal section of a tube these inserts can also, for example aid the attachment and installation of a threaded product, pairing perfectly with an adjustable foot for a quick and easy desk raising solution. Alongside their functional uses these Tube Inserts can be employed for their many finishing properties, providing a high end finish at a low cost, aiding the production or enhancement of a tubular product. Suited towards all kinds of industry standard tube and box section sizes (12.7mm, 19mm, 25.4mm) these Tube Inserts & Tube End Caps offer an easy to fit and use option for the end of your tube.  

As an extremely popular range for us these inserts are stocked in a variety of tube types and diameters as displayed below, offering many different solutions for round tubes, box sections as well as less conventional shapes. Feel free to view our selection below, offering free sampling, bulk pricing and measurement guides across our full inventory of products.

As one of the largest suppliers of Tube Inserts into the UK we are able to offer Round, Square, Oval & Rectangular shaped styles. 

Why Use Our Tube Insert Products?
  • To prevent the rapid ingress of dirt or moisture on the inside of a tube or box section
  • To provide a strong fitting for the insertion of externally threaded components
  • For providing structural integrity to a tube, pipe, pole or internal section 
  • Coming in plastic, metal, threaded, connector and spring styles
Each Range Has A Number Of Uses, Some Of Which Include: Check out our measurement guide for installation and measuring tips, or give us a call on -01233 713 581

See our full range of Inserts, Plastic Tube Inserts & Tube End Caps below. 

Our Selection of Tube Inserts

Round Tube Inserts
These Plastic Tube Inserts for Round Tubes & Sections are made from a strong and reliable LDPE Plastic which has been manufactured / produced to meet strict standards that ensures their long-term reliability. Working well as a finishing product for open tube ends, each insert that we offer here comes with ribs to hold them in tightly whilst the head sits flush at the end of your application. These Round versions come suited to industry standard sizes both in metric and imperial, ranging from half inch and inch sizes, along with common metric sizes such as 19mm / 22mm / 25mm. This type of product is used for capping or as a ' cap' for the end of a tube, hence why they are sometimes called 'tube caps' where they are placed over the exposed end. Upon doing so you negate the issues that can come along in regards to ingress, something which can cause the internal area of an un-covered tube to rust or erode or rust, meaning that the pole or post would need to be replaced long before it would have otherwise. We supply a huge selection of fittings and inserts for round tubes / tubing, whether you have a metal, plastic or rubber one. Coming in a large range of different size and styles to suit, these have excellent versatility for use with almost all applications, coming in alternate styles such as Domed, Chromed, Angled and Standard.
Square Tube Inserts
Our Square Inserts or quite simply put, Plastic Tube Inserts for box sections are manufactured using a handful of premium quality materials such as LDPE. Using such materials help to provide a solid insert that can easily provide a number of functional finishes to a tube or box section, these come in a range of variations including angled, domed, chromed and standard. When used as 'Tube End Bungs' to seal off and protect the end of a tube or box section, these have an extremely long life span thanks to their reduced movement. This allows them to sit inside the tube tightly over a long period of time, rather than some of our other plug / cap solutions which are easily removable or will fall off over time. Also known as plastic tube ends, these are a widely used solution for a number of uses including finishing or adding a functional finish such as our threaded inserts which allow for further external attachment of components such as a threaded foot. Being such popular forms of Plastic Inserts these are a go-to product for anyone looking to insert something into their square box section, whether it is metal tubing or plastic. Common inside the Hospitality industry, square tubing often makes up many desk type pieces of furniture, acting as leg inserts to protect the flooring and internal section that you have.
Rectangular Tube Inserts
Rectangular Inserts or Plastic Tube Inserts as they are also referred to as, are made from a strong and resilient LDPE (Low density polyethylene). They work great as a finishing product for rectangular tube sections as the ribs hold them in tightly whilst the head sits on the end flush. Although relatively un-common, rectangular shaped inserts are still extremely popular due to their ability to blank off and customize the end of an otherwise useless piece of tubing. When used as Tube End Caps these can easily 'cap' or 'plug' the end of a rectangular area, preventing ingress and providing a water tight seal to stop any excess water or unwanted liquids from working their way onto the inside of your tube. Available in standard plastic, aluminium and a number of styled options. We supply a huge selection of rectangular shaped inserts in a number of variants to provide you with the best possible choice for your application, these range from chrome finished Plastic tube fittings to our threaded fittings which are ideal for adding external threaded components to a rectangular tube. Also referred to as End Caps these are a lesser known form of Plastic Insert, slotting into Rectangular tubes which aren't anywhere near as common as their Round or Square counter-parts, because of this we aren't able to offer as many variations in this shape.
Oval Tube Inserts
Our Oval Inserts for tubes or simply put, Plastic Inserts are extremely popular inside a number of industries, most commonly inside the furniture industry where they are used as feet for chairs, desks or other assorted furniture. Alternatively they can also be used as finishing type inserts, this means they are used to provide a clean look and finish, something which they provide excellently due to the minimalist black design and clean finish that comes with these inserts. Along with their use as furniture inserts, these can be used to cap off or plug the end of an oval section, acting as a tube end cap to cover and protect the tube that it sits on. Coming in styles such as straight and angled, these are used mainly for chair or furniture legs where the shape is an un-conventional oval. Each of these oval plastic tube fittings or oval tube end bungs comes with ribs which help it sit inside the tube tightly and prevent it from moving excessively or even from falling out over time. As the least common variation of Plastic Tube inserts that we offer, we only offer oval shaped inserts in either a chromed or standard style.
Metal Tube Inserts
At Vital Parts we supply a huge array of different metal tube inserts and tube end caps solutions, these include square, rectangular and round variations to ensure we have the ideal product for you. Being made from high end Aluminium and Steel, these Inserts are widely used across a number of different industries for metal tubing and box sections, providing a thread and structural integrity simultaneously. Each of the Tube End Bungs inside this range comes with a few different thread types and sizes, often going from M6 up to M12. These Metal Fittings come with ribs on the exterior to provide a superior fitting in comparison to other products available, providing a simple yet efficient tap to fit experience. These work best with heavy duty applications due to the strong thread capabilities and ribbed stature, providing unbeatable strength ratings when inside of the tube or fitting. Perfectly suited to threaded products such as our Adjusting Feet, these Metal versions of our Plastic Tube Inserts are ideal for use with Metal Tubes, providing the ability to screw straight into place, making them an ideal pairing when looking for feet to support a table, furniture or appliances.
Threaded Tube Inserts
As a Plastic, Rubber & Metal product manufacturer we supply a huge array of threaded fittings or inserts to suit a massive variety of applications and uses. Our threaded section covers our standard plastic range as well as our heavy duty range which are some of our most popular and useful products that we offer here thanks to their high load rating. Each of these Tube End Caps / Plastic Tube Inserts is available in a range of popular and uncommon thread sizes, each featuring a female threaded nut for easy installation. Coming complete with ribs on the external section to create a tight fitting every time. We keep a huge stock of plastic threaded tube inserts as they are one of our most popular ranges that we offer thanks to their functional uses, along with their wide usage inside many designs and products all over the UK. Each product that we offer here fits on the internal section of a tube, pipe, post or pole, being held in place via versatile ribs. We offer a huge number of thread options with a vast array of metals available for your choice, these vary depending on the heavy duty and standard options however our stock covers Brass, Stainless Steel, Aluminium & Standard Steel type threads.
Threaded Spring Inserts
Our Threaded Spring Inserts and Metal Connectors for tubes are excellent options for adding a thread to an application, preventing the need for technical methods such as Flowdrilling or other Fabrication methods. As an advanced component these are excellent for use where a standard threaded tube end bungs wouldn't suffice, such as with metal tubing or posts. These kinds of connectors are excellent for connecting two tubes through a thread, this opens up a whole load of options for a number of projects which require two tubes to be connected by a thread. Our spring inserts are spring loaded and available in both square and round variants to suit, once placed on the inside of the tube these spring into place providing an extremely tight and secure fitting, only requiring tapping into position initially. Only available in Steel finishes these are not recommended for lightweight uses, therefore are suggested for use with heavy appliances or machinery. Although not typical Tube End Caps, these can work in the same way to add functionality to a tube. Although fitting differently, these act similarly in the sense that they can be installed to a tube or box section before having a foot or threaded component being screwed into place. Used over Plastic Tube Inserts for their strength and versatility, these Spring type inserts have the ability to hold themselves in position better when put under heavy load, making them a perfect pairing for threaded type feet.
Heavy Duty Threaded Inserts
Heavy duty type inserts are a commonly featured solution for use with heavier applications that require a lot more stability and structure. As threaded type Tube Inserts these are available with either a brass or stainless steel thread which is one of the strongest thread types available, this ensures that no matter what is attached, it will always stay sturdy and strong inside of the insert. These are one of the widest used heavy duty options due to their round or square shape which allows for their use inside a huge array of different tubes and fittings (such as round tubes, poles or box sections). Each of our heavy duty options are available with a solid load weight rating and maximum supporting load, especially high for round variants. For all relevant information regarding these products or to view a line drawing guide, please see the full product listing by clicking through.
Inserts For Furniture Legs
As a fairly unknown use for these Tube End Bungs. installation in to furniture legs is another one that often comes up as relatively unknown. It just so happens that these type of plugs / caps are perfect for the internal attachment to a hollow chair, appliance or furniture leg. Acting as a base or support for mounting, promoting stability with heavier applications. These come in a number of styles which are perfectly suited for this particular usage, as desk, chair or appliance feet. Coming in styles such as standard, angled and domed, these are all ideal for use with chairs as they can work to support the chair leg when it is in contact with the ground. Most commonly perceived as normal tube end caps / tube end bungs, these are often used in conjunction with school chairs or school furniture which are often round tubular or a square box section. These work in the exact same way as our standard inserts by simply requiring a push fit, preventing the need for advanced installation methods or adhesives.
Tube Connectors
As some of our newest forms of Plastic Tube Inserts, these Tube Connectors are suited mainly towards Square Tubing / Box Sections. Fitting together to provide structural integrity and to aid a tube system, these are a popular product for the creation or production of metal frames, helping them to fit together and extend. As less popular forms of Tube End Caps these aren't used for finishing, rather for their functional use to connect or join two tubes.
Fitting Guide
Installation of these Plastic Inserts / Tube End Caps type products are relatively easy, requiring just a tap with a hammer or mallet for a long term fitting. Especially easy to fit are the Plastic Tube Inserts variants which come with push fitting ribs (or shank) which can even be fitted by hand if required. This insert installation guide is aimed to educate on measuring as well as installation, along with detailing the many different options that we have available for your particular tube, pole or box section. Detailed with diagrams for measuring, this is an involved guide which should point you in the right direction.

Please click through to find all available product sizes.
For all relevant product information, or to view our available guides, please see the full category description above.


Welcome to Vital Parts
One of the largest and most trusted Plastic & Rubber Component Manufacturers in the UK.


Being one of the most trusted components manufacturers and distributors in the UK, we pride ourselves on providing our customers with the best services and products possible. Ensuring that we stay competetive by providing you with the best deal, along with free samples and secondary finishing services to give you the best outcome possible. As well as offering an excellent range of components we are able to manufacture to your specific requirements with a range of dip moulding, injection moulding, extrusions, rotational moulding and overmoulding techniques.


Why you should choose us for your Plastic, Rubber & Metal Component needs
Fast packaging and shipping at all times
Bulk discounts available on all products
Free sampling available on most products
Excellent, friendly customer support on 01233 713581

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