2021NF E25-026*NF ISO 3506-6:2021 Fasteners - Mechanical properties of corrosion-resistant stainless steel fasteners - Part 6 : general rules for the selection of stainless steels and nickel alloys for fasteners
2010NF E25-400-6:2010 Mechanical properties of corrosion-resistant stainless steel fasteners - Part 2 : nuts.
1998NF E25-400-6:1998 Mechanical properties of corrosion-resistant stainless-steel fasteners. Part 2 : nuts.