Anchor screw for heavy setup on drywall+OSB?

[Krilleman]

Do plumbers know how to use any other screw than construction screws? haha. But they actually work damn well!

Why would you need any other screw than construction screws and VVS screws? They work for everything! :wow:

 

[frihopper]

Do these work? They are admittedly 5.5 mm instead of 6 mm but maybe that's enough?

http://www.jula.se/catalog/bygg-och-farg/spik-och-skruv/skruv/specialskruv/vvs-skruvar-302277/

 

[tommib]

Well, they probably work but then you'll need a tray. They are also unnecessarily expensive since they are stainless, which your bracket screws don't need to be. Here is the one krilleman suggests http://www.bauhaus.se/byggskruv-6-5x50a-6kf-fzb-150.html
Admittedly a bit expensive for the six screws you need, but Bauhaus usually offers them in bulk as well.