Hi. I am building some raised beds using pressure treated 100mm deep sleepers. I am looking for 150mm screws to secure each row of sleepers into the row below, but want a countersunk screw so the head does not foul the next row which will go on top. Was looking at 150mm countersunk goldscrews. I know they're not really outdoor rated, but does this really matter? If they rust will it really be a problem? Stainless steel are so £££! Thank you
Have a look at ... https://www.screwfix.com/c/screws-n...cat7020001&productlength=150_mm|160_mm|180_mm Dont worry too much about countersinking, just make a small counterbore and the top will drive in. Or use wafer heads - teh 1mm will make no noticeable difference.
Do you believe everything you see on there? Have you never heard about using teh right tools for a job?
The OP was asking about corrosion. That video addresses the issue. I have observed similar corrosion resistance myself in my garden with Goldscrews.