As others have shown, they do exist.
Try FC Lane / Lane Electronics, on
They do a lot of connectors, and whilst I think Huber & Suhner are overrated, FC Lane are the official distributors for H&S. I paid £35 a couple of years ago for stainless steel N that are hermetically sealed. H&S were the only manufacturer I could find for them - or at least were obtainable. Lane Electronics were the only source I could find. They are single hole mounting though. I would have preferred 4-hole myself, but could not find any N hermetically sealed. But since you don’t require hermetically sealed, you should have a far wider choice.
If anyone can help it would be appreciated!