I want to screw a hook in to an internal door - which is the usual crap of hardboard like material on the outsides and corrugated cardboard on the inside.
The hook is screwed - outside diameter of screw is 5mm.
It will not be taking much weight but I do want it to be secure.
Any specific suggestions - a particular type of cavity wall fixing?
A small version of the "collapsing cage" type fixings is available for this problem. They come with there own screws which may or may not fit your hook.
Fix a solid timber strip across the door (screwed into the peripheral solid timber) to carry one or more hooks.
Known as a "cavity door fixing" in Focus IIRC. Same as plastic plasterboard plugs but tightens to 5mm.
I wouldn't start from there . . .
You can get plastic door hooks with a built-in fixing, especially for hollow doors. You drill a single hole (about 3/8" I think) through the hardboard, push the shank of the hook in, and tighten the screw. The shank expands inside the door and provides a firm fixing.
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