# Blind joints, how do they work?

{% hint style="info" %}
The page will be updated with detailed information in the future. We have included the basic details for now to make sure we have some information on the website.
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## What is a Blind Joint?

A blind joint on an extrusion involves a through hole on the side of the extrusion. This hole will be used to tighten a bolt that will screw together with another piece of extrusion. This other piece most likely has a threaded hole on the end.

This setup secures two extrusions at a right angle without exposing any parts externally, providing a clean look and robust connection.

## Enlarging images

Click the image to enlarge them, giving you a more detailed view.

## How do they work

{% stepper %}
{% step %}

### Take a threaded extrusion

Insert a bolt (depending on the frame size) into the threaded part of the extrusion.

<img src="/files/iwJAazTtbSfEwD1pnwXd" alt="" data-size="original">
{% endstep %}

{% step %}

### Screw bolt in

Leave 2.5 to 3mm of space between the bolt head and the extrusion end. This helps in sliding another extrusion on later.

<img src="/files/GZCzjZ97GjM4WTruhPkc" alt="" data-size="original">
{% endstep %}

{% step %}

### Slide in extrusion

Slide another piece of extrusion over the bolt we just added.

<img src="/files/5q0EwgXs5oR9a7tzSzEC" alt="" data-size="original">

Here is another view of the extrusion sliding over the bolt.

<img src="/files/Ilj9QqIGCQbdFH94xfrA" alt="" data-size="original">

{% endstep %}

{% step %}

### Making sure the surface is Flush

Ensure the surfaces are perfectly aligned. This is crucial, especially when we're trying to get a square frame.

See the red arrows: one shows a cut surface, the other the extrusion's side. Place this on a flat surface and find the edge on the mating surfaces with your fingers to align them. Keep them aligned for the next step.

<img src="/files/IhLJTiLAXadfAxaQjDvT" alt="" data-size="original">

{% endstep %}

{% step %}

### Tightening the bolt

Ensure the surfaces remain flush and tighten the bolt further. This will strengthen the 'blind joint' connection.

<img src="/files/eoNslWXpzqgtblKnigYx" alt="" data-size="original">

Great job! You've successfully created a blind joint. Congratulations!

<img src="/files/wLPtXZSxvJKlRbdy7dQ2" alt="" data-size="original">

{% endstep %}
{% endstepper %}


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