Caps & Closures Guide - A Buyer's Guide For Furniture Hardware

Caps & Closures Guide

In today’s blog we will investigate the world of caps & closures, Aerobolt has a comprehensive range of these decorative shape caps including square, round, rectangle, etc. with different design features such as dome, or angle head. These are also known as protective caps; tubing inserts or tube end caps and are ideal to close the end of a tube for a finished look that also seals and protects. Clever huh! Predominately made from hard wearing polyethylene, they are designed to be press fit into tubing with a finish that include gloss, matte or textured with a choice of a smooth shank or a rib design that allows for small fluctuations in tube diameter. These caps and closures are part of the Maumac® Component's furniture hardware range such as levelling feet, threaded tube inserts, furniture castors, control knobs and so much more.

What are the benefit of plastic end caps and closures?

Caps & closures main benefit is to seal and protect whilst providing a neat  attractive finish, plus;   

  • Easy to use as most are designed for a push fit installation that avoids messy adhesives.
  • A cost-efficient massed produced component that seals, protects and finishes off tubing.
  • Wide range of options and sizes, so there is bound to be one that suits your application.

How do I measure end caps?

End Caps are a relatively simple product to measure with a Vernier, (sometimes known as a caliper) or ruler. The most important measurements to consider are the Outside Diameter, Internal Diameter and the difference between the two, Wall Thickness (Gauge). Here's a quick run-down of how you can get the required measurements for a secure fit.

Outside Diameter (OD)

Firstly, you will want to find the Outer Diameter of your application. This is done by working out the distance between both outer edges of your object. For external fitting caps and closures this is the key measurement. You don't need any other measurement.

Outer Diameter

Internal Diameter (ID)

Secondly, you will need the Internal Diameter, especially if your cap or closure is an internal fitting option, these type of fittings are the most popular option. Measure the distance between the inner edges of your object This measurement is most important because most of our fitting dimensions are this size, double check to ensure a tight and secure fitting.

Internal Diameter

Wall Thickness (WT). Internal fitting cap & closure only.

Once you have the measurements of your tube (OD + ID) you can commence working out the wall thickness or the gauge, this will be required for a firm fit. You can establish this by the following formula (OD minus ID divide by 2 = Wall Thickness).

Wall Thickness

Once you have all three measurements, you can start looking for the right size cap or closure to suit.       

Due to the materials used, you may find that certain products have the ability to stretch across a range of diameters, preventing the need for an exact measurement.

What size cap or closure do I need?

When buying any caps & closures, the important thing you need to do is measure the tube correctly. Depending on which type of fitting you decide on there are 2 measurements you will need to know; the outside / external dimensions, and for internal fitting tube inserts you will also need to measure the wall thickness / gauge size. Refer to the images below for guidance.

How to measure Caps & Closures

Internal & External Fitting Caps and Closures

Internal vs. External

What type of tube end cap fitting do I need?

The final thing to decide is which type of fitting you need. Here at Aerobolt, we have a range of different plastic ends caps. 

Internal Fitting Plastic End Cap & Closures. 

Internal Standard Flat Head

Standard Flat Heads: Ideal for applications where you just want to cap an end, or a tube is at 90 degrees to the floor.

Internal Domed Head

Domed Heads: Offers a aesthetic enhancement/detail, as well as a different option to an angled insert.

Internal Angled Head

Angled Heads: Pre-Set angled ends, perfect for splayed legs or tubes where an angle is required.

Internal Threaded

Threaded Tube Inserts: Similar to the flat headed insert but with a threaded hole, enabling you to add a levelling foot, or furniture castors. 

External Fitting Furniture End Caps.  

External Standard Flat Heads

Standard Flat Heads: Perfect for capping tube & projections, whilst offering a degree of protection to paintwork.

External Domed Head

Domed Heads: Can be used as a universal angled cap, as well as offering a cosmetic enhancement.

External Angled Head

Angled Heads: Pre-Set angled ends, perfect for splayed legs or tubes where an angle is required.

How do you install caps and closures? 

Installation is straightforward. Step 1; Place cap at the end of tube. Step 2; Tap by hand or rubber mallet the cap or closure into the tube up to the fascia rim for a tight and secure fitting. Step 3; Congratulate yourself. Job well done! Due to the nature of these you will find these don't need for fasteners or adhesives.

Tube End Caps and Closures Summary.

These products are widely used to seal and protect, preventing damage to floors, as well as excessive wearing of furniture or chair legs themselves, providing 'like new' levels of grip, stability and anti marking properties. All of our caps and closures inserts are made to an extremely high standard, ensuring they are fit for purpose and in most applications make good contact with floors and sit flush on the end of the chair. A flush fitment enables their use for stacking and increases the longevity of your installation.

We stock a comprehensive range of furniture hardware, including caps and closures furniture inserts in a range of types for Round, Square (Including Box Sections), Rectangular and even Oval Chair Legs. Each shape and style has many different solutions to suit all kinds of chair and furniture uses, such as to raise height, improve grip, or ease movement. Please click here to your required fitments to see all possible options.

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