ISO 3506 — Mechanical Properties of Corrosion-Resistant Stainless Steel Fasteners

ISO 3506 defines the grades of stainless fasteners — A1, A2, A3, A4, A5 — and their strength designations such as A2-70 and A4-80.

What It Covers

• A1/A2/A3/A4/A5 steel groups
• A2-70, A4-80 strength grades
• Corrosion resistance by environment
• Marking requirements

Related Fasteners

• Hex Bolt
• Hex Nut
• Lock Nut
• Machine Screw