BS EN ISO 3506-1
Mechanical properties of corrosion-resistant stainless steel fasteners
Part 1: Bolts, screws and studs
Mechanical properties of corrosion-resistant stainless steel fasteners
Part 1: Bolts, screws and studs
for austenitic steel
for martensitic steel
for ferritic steel
-Similar to C1
-Intended for machining
May be included later
Are duplex steels. Have better properties than A4 and A5, especially concerning strength. Exhibit superior resistance to pitting and crack corrosion
Soft
Cold worked
High-strength
Soft
Hardened and tempered
Hardened and tempered
Hardened and tempered
Soft
Hardened and tempered
Soft
Cold worked
Fasteners that do not fulfill the tensile or torsional requirements because of the geometry may
be marked with the steel grade, but shall not be marked with the property class
See ISO 16048
For maximum corrosion resistance, passivation is recommended. Fasteners may be marked with the symbol "P" after the symbols for steel grade and property class