I bought these 4 years ago and haven't had an issue with rust. I live in an extremely salty environment year round.
M5-0.8 x 10mm Flanged Washer Button Head Socket Cap Screws, 304 Stainless Steel 18-8, Allen Hex Drive, Full Thread Coarse Thread UNC, 50 PCS https://a.co/d/9HT3v7j