Spax Single Thread Woodscrews 3.5 x 50mm Pack of 200
This is not the cheapest wood screw but it is well worth the extra cost - it drives fast and self drills without splitting materials even at the edge of MDF. This saves time and effort, once you try these you won't go back to the cheaper alternatives.
19 Dec 2014
Better than a the rest
Eye wateringly expensive to buy in
Super strong and don't cam out.
Can be driven into oak without risk of breaking
I've gone over to only using Spax screws because they are head and shoulders better than all the others.
25 Jan 2015
Spax: always outstanding
Accurate fit on Posi screwdriver, drives really well, sharp self drilling point and excellent grip.
Pilot hole needed on oak and other dense hardwoods as you'd expect.
3.5mm is about the same as the old number 6 woodscrew - as far as I can tell, only Spax is available at 50mm long: Turbogolds and Goldscrews are not, at least not from Screwfix.
Only down side is the priice but as ever you get what you pay for. Highly recommended.
17 Nov 2014
Ideal power driver screw
These screws are easy to drive with a power drill without the need for a pilot hole. The heads do not snap off under pressure and the bits retain their grip on the head without rounding. I could not find any information on resistance to rusting so will have to wait and see how they perform outdoors.
20 Nov 2014