Hi Ian,
Here is a source for zinc plated 1/4 BSF raised countersunk slotted screws. Obviously they would have to be plated.
https://www.ebay.co.uk/itm/1-4-X-5-8-BSF...1813613969
I just received some stainless 1/4 BSF raised countersunk slotted screws from Middleton. I can't find them on the site right now, but know they have them.
https://www.stainlessmiddleton.co.uk
Erich in Seattle
Here is a source for zinc plated 1/4 BSF raised countersunk slotted screws. Obviously they would have to be plated.
https://www.ebay.co.uk/itm/1-4-X-5-8-BSF...1813613969
I just received some stainless 1/4 BSF raised countersunk slotted screws from Middleton. I can't find them on the site right now, but know they have them.
https://www.stainlessmiddleton.co.uk
Erich in Seattle