Hello,
These are corrosion resistant so could be used outside.
However, decking tends to move alot (the wood expands when wet/shrinks when hot) because of this movement the screws need to be flexible. Decking screws are a much better option to use as they are designed to withstand the movement of the boards.
Most normal woodscrews may not be flexible enough and could sheer/snap.
Take a look at our decking screw range using the below link:
https://www.screwfix.com/c/screws-nails-fixings/decking-screws/cat840048?cm_sp=managedredirect-_-screwsfixings-_-deckingscrew
Thanks for using Q&A. [DG]
Answered by: DGIFF
Date published: 2020-08-14