Roll-fast is bigger diameter bolts & nuts in stainless steel grades in A4-70, A4-80, B8, B8M Class 1 and class 2, SS316S31, A4-70L and A4-80L as per ISO 3506-1 & B7, B16, B8, B8M as per ISO ASTM A193. The Stainless Steel Bolts are specified for high temperature and high pressure services. Roll-fast is a leading manufacturer and supplier of the different stainless steel fasteners. https://www.roll-fast.com/products/standard-bolts/stainless-steel-bolts.html