In article , mike
writes
"fred" wrote in message ...
In article , mike
writes

Try hammer fixings:
http://www.screwfix.com/app/sfd/cat/cat.jsp;?cId=101150
8x80 or 8x100 would be my choice, codes 17286 & 19356 respectively.
Don't buy these from B&Q as they are a real rip off there.


you really think I need screws that long? If left unadvised I would have
chose 50mm ones

For a high value or heavy item yes. I would want to make sure the screws
are in shear and have no risk of pulling in any other direction. In a situation
like this I would discount any grip achieved in the first inch of a hole
because:
1. If the wall is plastered then is it is only after the first inch you are in the
wall proper.
2. The action of your hammer/sds drill may weaken the outer shell of the
plaster/brick(*) causing a little cone to spall out (fail) in the future.
If you accept my discounting the first inch then a 2" rawlplug only gives an
inch of grip, 75mm hammer fixing gives 2" and so on, so it is worth going
for the extra length of a 75mm at least.

Bear in mind that an 8mm hammer fixing does not use an 8mm screw,
that is just the dim of the hole for the plug, the screw head will be no
bigger than a 2x10 that you might use in your 2" rawlplug.

This is based on my experience with brick walls covered in an inch 100yr
old plaster, you learn not to rely on that first inch from bitter experience :-)

(*) I know yours is breeze block, but I reckon if you were to pull on a well
anchored plug sitting only 1" in a breeze block you would get the plug in
your hand with a neat little cone of breeze block sitting on it.

HTH
--
fred