ISO 898-1 Carbon Steel and Alloy Steel - Bolts, screws and studs

Chemical composition as per ISO 898-1 for typical grades

ClassMaterial and TreatmentC
min.
C
max.
P
max.
S
max.
B
max.
Tempering temp.
[°C]
8.8carbon steel with additives (e.g. b, mn or cr) quenched and tempered0.15 (d)0.400.0250.0250.003425
8.8carbon steel quenched and tempered0.250.550.0350.0250.003425
10.9carbon steel with additives (e.g. b, mn or cr) quenched and tempered0.15 (d)0.350.0250.0250.003340
10.9carbon steel quenched and tempered0.250.550.0250.0250.003425
10.9carbon steel with additives (e.g. b, mn or cr) quenched and tempered0.20 (d)0.550.0250.0250.003425
10.9alloy steel quenched and tempered (g)0.200.550.0250.0250.003425
12.9alloy steel quenched and tempered (g)0.280.500.0250.0250.003380

(d) in case of plain carbon boron steel with a carbon content below 0.25% (ladle analysis), min manganese 0.6% for 8.8 and 0.7% for 10.9
(g) alloy steel shall contain one of the following elements: chromium 0.30%, nickel 0.30%, molybdenum 0.20%, vanadium 0.10%

Mechanical and physical properties as per ISO 898-1 for typical grades

Mechanical or Physical PropertyClass 8.8
(M16 and below)
Class 8.8
(above M16)
Class 10.9Class 12.9
Tensile strength
(MPa)
nom.80080010001200
Tensile strength
(MPa)
min.80083010401220
Stress at 0.2% non-proportional elongation (yield)
(MPa)
nom.6406409001080
Stress at 0.2% non-proportional elongation (yield)
(MPa)
min.6406609401100
Stress under proof load
(MPa)
nom.580600830970
Elongation after fracture for machined test piece
(%)
min.1212108
Reduction of area after fracture for machined test piece
(%)
min.52524844
Impact strength, charpy v-notch
(J)
min.272727(under investigation)

Hardness requirement as per ISO 898-1 for typical grades

Hardness ScaleClass 8.8
(M16 and below)
Class 8.8
(above M16)
Class 10.9Class 12.9
Vickers, HV250-320255-335320-380385-435
Brinell, HB238-304242-318304-361366-414
Rockwell, HRC22-3223-3432-3939-44

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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