1.2842

Data verified

1.2842 (90MnCrV8) is the DIN designation of the O2 oil-hardening manganese tool steel — one of the most stocked tool steels in Europe and Asia for general-purpose dies and cutting tools.

Hardness57–62 HRC

DIN1.2842

AISIO2

JISSKS31 (near)

CategoryTool Steel

Chemical composition

Element	Content (%)
C	0.85–0.95
Si	0.10–0.40
Mn	1.80–2.20
Cr	0.20–0.50
V	0.05–0.15

Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.

Properties

Delivery condition	Annealed
Hardness (hardened)	57–62 HRC
Density	7.85 g/cm³

Heat treatment

Harden 790–820 °C oil; temper 150–250 °C.

Equivalent grades

Standard	Designation
din	1.2842
aisi	O2
jis	SKS31 (near)
gb	9Mn2V

Compare side by side: 1.2842 vs O2 · 1.2842 vs O1

Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.

Applications & Processing

Applications: Punches, blanking dies, taps, reamers, gauges, ejector pins, forming tools.

Processing: Easy to machine and harden; keep quench distortion in mind versus air-hardening A2 for precision dies.

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Source: EN ISO 4957 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.