ISO 898-2: Carbon Steel and Alloy Steel - Nuts - AF Ltd.
Andrews Fasteners Limited
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ISO 898-2: Carbon Steel and Alloy Steel – Nuts

Chemical composition as per ISO 898-2 for typical grades

CLASS MATERIAL AND TREATMENT C
MAX.
MN
MIN.
P
MAX.
S
MAX.
8 (M16 AND BELOW) CARBON STEEL (MAY BE QUENCHED AND TEMPERED) 0.58 0.25 0.060 0.150
8 (ABOVE M16) CARBON STEEL QUENCHED AND TEMPERED 0.58 0.30 0.048 0.058
10 CARBON STEEL QUENCHED AND TEMPERED 0.58 0.30 0.048 0.058
12 CARBON STEEL QUENCHED AND TEMPERED 0.58 0.45 0.048 0.058

Hardness requirement as per ISO 898-2 for typical grades

HARDNESS SCALE SIZE CLASS 8
MIN.
CLASS 8
MAX.
CLASS 10
MIN.
CLASS 10
MAX.
CLASS 12
MIN.
CLASS 12
MAX.
VICKERS, HV M5 TO M16 200 302 272 353 295 353
ABOVE M16 TO M39 233 353 272
BRINELL, HB M5 TO M16 190 287 259 336 280 336
ABOVE M16 TO M39 221 336 259
ROCKWELL, HRC M5 TO M16 30 26 36 29 36

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

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