What Mounting Bolts to Use?

[carlyai]

SWMBO bought this shade awning, but where she wants it mounted means the bolts will be in QCon blocks.

I don't think you can use these type of bolts in QCon blocks.

They are fairly heafty bolts.

Any mounting bolts suggestions?

[Skipalongcassidy]

Actually the expansion bolts work very well in block walls

[sammieuk1]

Yes got one installed over the back door for the last year and its still there with those bolts ????

[OneMoreFarang]

Something like this should work, obviously in the correct size.

 

SLEEVE ANCHOR DEXZON 8X35MM 8EA (homepro.co.th)

 

[sometimewoodworker]

1 hour ago, carlyai said:

SWMBO bought this shade awning, but where she wants it mounted means the bolts will be in QCon blocks.

I don't think you can use these type of bolts in QCon blocks.

They are fairly heafty bolts.

Any mounting bolts suggestions?

My opinion is that those expansion bolts are not the best option. The reason is that QCon and other AAC blocks are soft and so compressible. Those expansion bolts are great for concrete that is virtually incompressible. 
 

So while the compression bolts have just a smooth surface that since AAC is soft it here is a potential for them loosening. 
 

The best fitting for AAC blocks are the Saw Steel Anchors 

They are available from DoHome or online. (EDIT the local HomePro doesn’t have them despite @OneMoreFarang having found them) the requirement is for 8 x 60,  and 12 x 3” screws (gold above) or 10 x 60 (silver above) the 10 x 60 are not available AFIK except by online shopping, FWIW I have never used the 10 x 60 I only got them a couple of weeks ago.

 

I have used several hundred in my workshop over the years. These two cabinets are a small example they have physics and 3 screws and 1 rail for each cabinet holding them up

 

unlike the smooth expansion fittings the have about 90 teeth that bite into the blocks.

 

The disadvantages are that you need to fit them into a slightly tighter hole that is usual for wall plugs so that needs to be tight but not to tight as when you hammer them in they can deform, and if they can be just pushed in they will not be able to expand enough. The other disadvantage is that if too tight the impact driver is perfectly capable of snapping off even a No. 3 x 3” screw (yes I have done that a few times) and you absolutely need an impact driver for that size and length screw.

 

EDIT AGAIN if using the 10 x 60 and lag bolts I think it unlikely that you can snap the head off and you have more options, though an impact wrench is definitely the easiest way to drive them in.

Edited February 25, 2023 by sometimewoodworker