Which screw and plug for this?

[snowjim]

Hello,

I'm going to set up 3 brackets for a shelf of 40x20 cm that should hold up to 20 KG on a lightweight concrete (hollow block) wall in the basement.

Here's what the bracket looks like with the included plug (the plug is 6 mm and the screw seems to be 4 mm:



The mount actually comes with 2 screws, but I have installed similar brackets for the same weight in a drywall with Molly screws (1 in each) and it has worked excellently.

The hole in the bracket itself is 5-6 mm, so I can choose a larger screw with a countersunk head. The question is, what should I choose? I guess I need a better plug? Please give examples from Harald-Nyborg, Biltema, or Jula as they are the closest.

I have these plugs at home:

http://www.clasohlson.com/se/Pluggsats/30-6295

But maybe they're not great, I'm open to buying other brand plugs, preferably in some type of kit so that I have them for the future as well.

 

[snowjim]

I see now that it says Fisher UX6 on the plugs included, they might be good enough for this purpose? It will then be 3 of those holding MAX 20 KG.

 

[slacker]

It will probably be fine with those that come along - Generally, I think that plugs that come with various shelves and such are too short.
I always choose to toss them over my shoulder and go with Essve Nylon Plug NL8x65, a good length that definitely grips in lightweight concrete - Countless kitchens have been installed with them in lightweight concrete walls. It’s a good compromise between length and hole size. For that, I choose a 6mm screw at 70-80mm, like Essve.

The larger hardware stores sell good plugs in various sizes.

 

[ensamresande]

It was generous of the shelf manufacturer to include Fischer UX plugs; often the plugs that come with are just junk. However, in your other thread, there seems to be uncertainty about whether you have hollow block of "real" concrete or some form of lightweight concrete/lightweight clinker. This makes a big difference when it comes to which plug you need to use.

If you have hollow block of real concrete, Fischer UX works excellently. According to the load table (here), a UX6 in "Hollow sand lime stone" (close enough to concrete hollow block) is rated for 0.40 kN = about 40 kg.

But if you have hollow block in some form of lightweight concrete/lightweight clinker, that's a completely different matter, and in that case, I would have used a longer plug than that. Essve NL 8x65 would probably be good in that case; and these actually seem to be sold (probably as no-name) at Harald Nyborg, which you preferred: http://www.harald-nyborg.se/nylonplugg-8x65.html.

 

[ensamresande]

You might add that Essve NL 8x65 of course works excellently even in hollow stone of real concrete; so if you're unsure, go with these (and follow slackers' screw recommendation) and it will be fine.

 

[snowjim]

Sounds like I should go for Essve NL 8x65, are they available at Byggmax, Harald, Clas Ohlson, or Jula? Tried to find them without success.

 

[snowjim]

Traveling alone, the link to harald doesn't seem to work? Do I need another screw as well?

 

[ensamresande]

Ensamresande, the link to Harald doesn't seem to work? Do I also need another screw?

I have fixed the link above. However, I see now that they are quite small packages.

It might also be worth looking for Fischer SX 8x65; it is even nicer than Essve NL 8x65. These are sold, among other places, in bulk on Amazon in Germany link; should be about 160 SEK including shipping.

 

[slacker]

Sounds like I should go with Essve NL 8x65, are they available at byggmax, harald, classe, or jula? Tried to find without success.

Unfortunately, I'd probably say that none of them sell Essve's product range - I know that Bauhaus carries Essve.

 

[snowjim]

This is what I found, what do you say about it?

 

[ensamresande]

Looks like the right plug. If you can fit the 6x80 screw in the bracket, go with it, otherwise 5x70.

 

[slacker]

I found this, what do you think about it?
[image]

Perfect! That should work!

 

[KnockOnWood]

Hello,

I will set up 3 brackets for a shelf measuring 40x20 cm, which should support up to 20 KG on a lightweight concrete (hollow) wall in the basement.
...

A small comment in passing:
Oversize significantly! Don't just think about the planned static load.
Suddenly, someone careless might lean the back against a shelf edge,
or a child might grab and pull themselves up using their hands to see what's there.
And then those 20 kilos might not be enough.
So: Long screws, and as thick as can fit in the bracket

 

[snowjim]

The larger screws fit if you screw them into the bracket; a larger screw won't fit. You can see that they will protrude a few mm into the plug, but as I understand it, it doesn't matter. However, this probably means I need to drill a slightly deeper hole than the plug is.

Here you can see how big the screw is and how it compares to the one that came with it.




A bit misleading since the accompanying screw is on the bench and thus looks even smaller.

The wall is ready to be drilled into, just hoping the screw doesn't find its way out the other side of the wall (pannerum)

 

[ensamresande]

The larger screws fit if you screw them into the bracket, larger screw won't fit.

Perfect, just the right size then, in short.

You can see that they will stick out a few mm in the plug but as I understand it, that doesn't matter. However, this probably means I need to drill a slightly deeper hole than the plug is.

On the contrary, a screw should stick out through the plug. And you should always drill a hole that is deeper than the screw/plug.