ISO 898-2 Carbon Steel and Alloy Steel - Nuts

Chemical composition as per ISO 898-2 for typical grades

ClassMaterial and TreatmentC
max.
Mn
min.
P
max.
S
max.
8
(M16 and below)
carbon steel (may be quenched and tempered)0.580.250.0600.150
8
(above <16)
carbon steel quenched and tempered0.580.300.0480.058
10carbon steel quenched and tempered0.580.300.0480.058
12carbon steel quenched and tempered0.580.450.0480.058

Hardness requirement as per ISO 898-2 for typical grades

Hardness scaleSizeClass 8
min.
Class 8
max.
Class 10
min.
Class 10
max.
Class 12
min.
Class 12
max.
Vickers, HVM5 to M16200302272353295353
Vickers, HVabove M16 to M39233353272353272353
Brinell, HBM5 to M16190287259336280336
Brinell, HBabove M16 to M39221336259336259336
Rockwell, HRCM5 to M163026362936

ISO 898-2:2012 Mechanical properties of fasteners made of carbon steel and alloy steel – Part 2: Nuts with specified property classes – Coarse thread and fine pitch thread

Whilst the information is provided in good faith, Andrews Fasteners Ltd are not under any responsibility or liability in respect of errors or information that was found to be incorrect or for any reliance the user may place on it.

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