Stainless steel rivets combined with either u003ca href=u0022https://www.rapiddirect.com/blog/stainless-steel-types/u0022 target=u0022_blanku0022 rel=u0022noreferrer noopeneru0022u003estainless steelu003c/au003e or steel mandrels are the strongest. However, steel rivets combined with steel mandrels are also solid. This is also the case with aluminum rivets combined with steel mandrels.