The type of installation also influences the fixing selection. The different installation types are:  flush, through and spaced installation  (Fig. 1 to 3).

With flush installation, the fixing is flush with the building material surface. Note: the drill hole is larger than the hole in the object to be mounted.  The screw, therefore, fixes the component and when tightening the screw, the fixing cannot be pulled outwards through the hole in the component.

The disadvantage with this procedure: the spacing of the holes on the part to be mounted must be transferred exactly to the anchor base.

In through installation, this stage is omitted. The hole is drilled in one step through the holes of the part to be mounted. 

Therefore, both have, the same diameter. The fixing is pushed through the part to be mounted into the drilled hole and anchored.

Spaced installation is applied, e.g. for façade elements that must be fixed at a certain distance to the anchoring surface due to the insulation between, and the air space required. A further frequent application is when components to be connected have to be carefully levelled on an uneven subsurface.


 
 
Flush installation:
In flush installation, the fixing forms a flush fitting with the building material surface.
   
 
 
Through installation:
When the fixing is pushed through the object to be mounted into the drilled hole, this is known as through installation. 
   
 
 
Spaced installation:
In spaced installation, the part to be mounted is fixed with defined spacing.