End cap or plug, which one to choose?

The differences between an insert and a cap

Inserts

An insert is inserted into the end of a hollow tube or a chair leg, for example. Once installed, the insert is perfectly flush (no overhang) with the outer walls of the tube or leg into which it is inserted. Of course, it is essential to measure correctly (see our article on this subject) so that the chosen insert has the same external dimensions as the tube.

The insert consists of a part with fins (also called ribs) which is positioned inside the tube and a visible part which remains outside the tube, the base. The part of the insert with the fins ensures it is held securely in the tube and allows it to adapt to various tube thicknesses. The outer part with the base serves as protection between the end of the tube and the floor (leg insert) or people (finishing insert).

➜ All our inserts

Caps

A cap, meanwhile, fits over the end of a tube or chair or table leg. These tubes or legs can be hollow or solid depending on the type of cap used. The cap encompasses the end of the tube and is more visible than an insert. It can be made from dense plastic as well as rubber. If it is rubber, the cap will generally be non-slip for increased safety and will provide good noise and vibration reduction for greater comfort.

The shape of the cap is slightly smaller than the dimensions of the outer walls of the tube or chair leg. This allows the cap to grip the tube strongly and stay in place long-term. When you choose a cap, select one that has the same external dimensions as those of the outer walls of the leg or tube on which it will be installed.

➜ All our caps

Plastic insert models

In the range of inserts, there are 2 main types: leg inserts and finishing inserts.

Leg inserts

Leg inserts are more resistant with a thick outer base that rests on the floor. Their design and the materials used are sized to support heavy loads intensively. They can also be made with polymers (complex plastics) or rubber, making them non-slip, noise-dampening, or vibration-dampening.

➜ See our leg inserts

Finishing inserts

Finishing inserts are used to protect the ends of tubes that do not rest on the floor or support weight. They have a thinner outer base, making them more discreet. These finishing inserts protect people from potential injury due to the sharp ends of the tubes. They also prevent moisture or insects from getting into the profile.

➜ See our finishing inserts

Under what conditions should an insert be used?

An insert will be more appropriate for aesthetic reasons when you want a discreet solution. In this case, you can choose between standard finishing or leg inserts (in HDPE, for example). Or also non-slip and reinforced inserts for furniture that rests on an uneven or abrasive surface (stone, pool decking…). Finally, an insert is also a good option for a leg insert that rests on a hard surface like parquet or tile. The insert will not mark the floor and will ensure smooth sliding.

Plastic cap models?

In the range of caps, there are 2 main types: leg caps and finishing caps. The main difference between these two types of caps lies in the materials used for their manufacture. Leg caps are very robust and often non-slip. Finishing caps can be flexible or rigid and are suitable for protecting ends that do not rest on the floor.

It should be noted that caps installed on solid profiles have a completely smooth inner surface. On the other hand, caps for hollow profiles have a retaining groove on the inner part that is in direct contact with the profile.

Foot ferrules

In general, foot ferrules are made of rubber or flexible plastic. They offer excellent resistance to the most demanding conditions (heavy loads, difficult floor surfaces, daily use). These tips are also non-slip and adapt to any type of floor, even the most uneven ones. Furthermore, they offer very good grip, making them particularly useful on smooth and slippery surfaces such as tiles or outdoor flooring.

➜ See our foot ferrules

Finishing plugs

Regarding finishing plugs, they are manufactured from low-density plastic (LDPE) and are used on hollow profiles or posts. Their rigidity provides them with a secure friction fit on the posts they cover. They are highly resistant to harsh outdoor conditions (sun, moon, frost, intense heat), especially in the black color version. Indeed, black plugs are the most resistant to the effects of the sun and moon.

➜ See our finishing plugs

Under what conditions should an external cap be used?

External caps are well-suited for solid tubes, of course. But they are also used when looking for strong adhesion and optimal floor protection. Their large contact surface perfectly conforms to uneven floors and ensures good floor grip for better stability and reduced risk of falling.

External caps may also be chosen for aesthetic reasons. Notably on chair legs for children or in schools that use these types of tips.

Another essential article:

How to properly measure a profile or tube to find the end cap with the right dimensions