Questions & Answers

… find answers on most common questions we get


An undercut anchor is a mechanical shape interlock provided by the undercut in the panel.
The mechanical interlock is formed by anchor’s sleeve, which opens in the “cavern” – undercut shape using IFSeT impact free setting tool. The undercut is formed by a special drilling technology (daVIDmyBOBGoliatH v1 or GoliatH v2) or by special construction of the anchor “self undercut anchors” (more information on request).

Note: Undercut anchors do not create stress in the material during installation.
Undercut anchors are NOT expansion bolts.


Blick offers undercut anchors for nearly all materials of a thickness of min 8mm (under some conditions from 6mm):
-hard stones: granites (Kashmir White), quarzites, basalt, porphir,
-soft stones: sandstone, limestone (Moca CreamJura Beige), marbles (Snow Ray Light), slate (Welsch Slate or Spanish Slate),
ceramic and porcelainMosa, Petraluxe, Mirage, TheSize, Laminam,
-solid surface: HiMacs, Corian, Staron, Akrilika,
-fibrecements: equitoneSVK,
-concrete: GRC, UHPCVHCTFCC, Stella Stone, Steinblau, ReiderCBtB Radzymin, Yerg, BoMAbeton, Taktl, Microbeton…,
-ceramic glass: Structuran, Decoran,
-glass: cristal clear VSG-TVGopaque VSG-ESGfusing,
-and other materials (Rockpanel, Richlite, Neopariesaluminium honey comb) based on Material Recommendation.

Which type of undercut anchor should I use?

There are two main types of constructions of undercut anchors in general:
– STUD – these with external screw type BSA-S or HDA, which are more economic and used on site,
– FLUSH – these with internal thread, by example – BSA-SQ or BSA-C, these were used by fabricators, when installed in factory,
Find out which suits you best.

There are many options among both FLUSH and STUD groups, individual constructions made on request and special applications like INFILL or Skylight.
On a separate site you can see Material Recommendations presenting variety of applications and test results.

If you are still not sure, which anchor you need, just ask, sending us more details re material type & thickness and application by our contact form.

How much torque should I use?

Proper anchor fixing is a an important case especially when fragile materail is fixed.
Blick spent much time to choose right tools.
Find out how to and which tools should be used for a safe installation.

Why should I use mechanical fixings ?

Blick recommends mechanical fixings above adhesives because of following reasons:

– mechanical fixings are easy to controll and calculate,
– structural design made by approved designer is fully corelated with fixing’s tigheted with torque wrenches,
– mechanical fixing is independent to temperatures of application,
– mechanical fixings are longlasting, uppon the time parameters stay the sam,
– mechanical fixings are resistant to UV.

How Blicksystem panels are tested PART 1/2?

Within years our solutions were tested ina variety of ways.
A very good example is presented during CWCT tests.
Check how we do this.

How Blicksystem panels are tested PART 2/2?

Here we present how complete facade system with large panels are tested.
Check how we care about safety.

Blick system anchors are ETA approved.

Would you like to know more about testing procedure and ETA requirements.
Here we uncover some little part we found out about this process.

How to set up IFSeT?

Imact Free Setting Tool.
Take a look at how to set up IFSeT in an easy way.

How to build fireplace mantle within an hour?

Use Blick technology for high speed installation.
Usually fireplace mantle installation take a couple of days, moreover is based on adhesives.
Blick system technology secures all elements, that expand and shring freely, which is crucial in fireplace branch.

How to replace facade panel?

Sometimes we got questions how to replace broken panel.
Such situation happens very rarely.
Anyway, if happens, this is our solution how to do this in a proper way.

What is the minimal overhang?

Fixing panels interior requires less space.
The minimum overhang may be 26mm only if the wall is flat.
26mm equals to two AS45 rails put together.
Here is how we do this.

How to cover columns?

Covering columns in an elegant way is always good question.
One of answers is to use solutions existing in stone branch, which seems to be most economic way.
Front panels meets reveal under 90º angle.

How to equalize surface of different thickness panels? Part 1 of 2

There are details, when panels of different thickness are used.

Here you can see how to do this using different brackets of AluStructure 45.


How to equalize surface of different thickness panels? Part 2 of 2

There are details, when panels of different thickness are used.

Here you can see how to do this using extra packers. Based on AluStructure 45.


How to install undermount sink in a safe way?

Blick was growing based on stone branch experience. One of dept. is supplyign kitchen countertops.
Mechanical fixings are the only way we install sinks to kitchen countertops.
Here is how we do this.

How do I know anchor is deformed correctly?

Good question, especially if you do not see it. Anchor is set inside the material.
However on site technical manager may require QC.
BSA-SQ anchors allow to controll if anchor is properly deformed.
Check how we do this.

What’s drilling depth tolerance for Blick’s anchors?

Recommended drilling depth tolerance: 2-3 mm.
Total maximum drilling depth tolerance: 4.5 mm.
It is a very important question especially for fabricators and installers.
15mm anchor is installed in undercut holes min 15mm deep, but it also can be installed in 18mm undercut holes, which gives 3mm tolerance. From the other hand the anchor may go out from the material not more than clamp thickness, let’s say 1.5mm (clamp thickness is 2mm). Remember that setting anchor in the clamp requires to make different diameter hole in the clamp, usually ∅10mm (check technical data before drilling). Alternative options is to use washer/packer. Both tolerances give total tolerance depth of 4.5mm.

We strongly recommend to drill undercut holes 1-2mm deepet than reference depth. So 15mm anchors are usually set in undrecut holes 16-17mm deep.

Here we present some way of solving this detail, take a look and see the solution.
NOTE: please note that the performance of undercut anchor (pull out and shear load depend on setting depth, any changes have significant impact on pull out). Blick’s Material Recommendations refer to embedment depths of anchors only. In case of any question, please contact Blick for more explanation.

What’s the relationship between anchor setting depth and pull out?

Considering the same material, setting anchor deeper delivers higher pull out and shear load values.
Here we present what results we can get setting 10, 15 and 20mm anchor in Jura limestone.

NOTE: please note that Material Recommendations by Blick refer to specific embedment depth. Installing anchors deeper is allowed, while it delivers higher loads, so you stay on safe site. All applications, where anchors are installed shallower require Blick’s apporval.

Can I use Blick undercut technology on my CNC machine?

To use Blick technology you do not need to buy drilling machines if you own CNC.
Here is how we make undercut holes on Blick’s CNC machine.

Will the panel withstand 10J hard body impact?

Metal ball hits the facade. Does not matter who throw it. This is a theory or practice?
-but if it happens, panel fells off and what then?

What is 10J?
1kg stainless steel ball hits the ground from height of 102cm with energy of 10J.

How 500J soft body test is made?

Here we speak about 500J soft body impact energy hit in glass panel installed on AluStructure 45.
Check by yourself if the panels will stay on it’s place.
What is 500J?
– it is when 50kg impactor hits the ground from height of 102cm.
This is really strong impact.

Where to locate undercut anchors on large facade panel?

This is a very difficult question, because of responsibility, which should be taken under consideration.
Here we present EXAMPLE ONLY of typical layouts of undercut anchor locations on large facade panels to uncover some part of this uncommon knowledge.

IMPORTANT NOTE: please note that there are many different conditions, loads and material characteristics.
To confirm the layout a proper tests and calculations have to be made, therefore the movie has to be considered as an EXAMPLE ONLY and Blick does not bears any responisbility for improper use without our formal confirmation written and signed by approved structural designer and proper for particular project and described loads.

What galvanic corrosion is?

Galvanic corrosion takes place when amterials of a different electric potential are in contact espoecially in wet conditions, which leads to material destruction and failure.

Here you can see a small example of galvanic corrosion, when stainless steel construction is fixed by zink plated screws.

How to install hinges in solid surface?

Blick ofers secret fixings not only for facade industry.
Based on requirements from site of furniture fabricators we have developed a safe solution, which warrants that panels will be fixed surely.

Here is how we do this.