Screws

[Bodgejob]

I know brass screws are normally recommended for use with Oak to prevent the tannins corroding the fastener and causing staining.
Is this based on old types of protective coatings or do modern coatings still have the same problems? For example would passivated coated screws still stain?
The reason I ask is because I am having trouble finding a supplier of good quality solid brass screws that preferably have either a square or torks style drive (I never seem to get on very well with slotted screws even after drilling pilot holes and using another screw beforehand to reduce camming out)
If anyone could point me in the right direction that would be great thanks

[thatsnotafestool]

Stainless steel works fine