Tool Steel
O1 · 1.2510
Also known as 95MnWCr5 / SKS3
Oil-hardening cold-work tool steel for gauges and cutting tools.
O1 (material 1.2510, 95MnWCr5) is a manganese oil-hardening cold-work tool steel with good dimensional stability on hardening and good machinability. Used for gauges, cutting tools, dies and woodworking tools. Supplied as round and flat bar.
International equivalents.
The same steel by country and standard — near matches; mill certificate governs.
Chemical composition.
Indicative, % by weight per EN ISO 4957. Mill certificate governs.
| Element | % |
|---|---|
| C | 0.90 – 1.00 |
| Si | ≤ 0.35 |
| Mn | 1.00 – 1.20 |
| Cr | 0.50 – 0.70 |
| W | 0.50 – 0.70 |
| V | ≤ 0.10 |
Mechanical properties.
Indicative; depends on dimension and heat treatment.
Available forms.
Size range: Ø 8 – 300 mm
Typical applications.
- Gauges
- Cutting tools
- Blanking dies
- Woodworking tools
FAQ.
What is O1?
O1 (material 1.2510, 95MnWCr5) is a manganese oil-hardening cold-work tool steel with good dimensional stability on hardening and good machinability. Used for gauges, cutting tools, dies and woodworking tools. Supplied as round and flat bar.
Is O1 the same as 95MnWCr5?
Yes — O1 is the European (EN) designation, while 95MnWCr5, SKS3 are the matching names used in other countries and standards (for example AISI/SAE in the USA, JIS in Japan, GB in China, former DIN in Germany). They are near equivalents and may differ slightly in chemistry; the mill certificate governs the exact specification.
What are the international equivalents of O1?
O1 corresponds to O1 (AISI), 95MnWCr5 (1.2510) (EN), SKS3 (JIS). Equivalents are nearest matches by country/standard; the mill certificate governs the exact specification.
In which forms is O1 available?
O1 is supplied as Round bar, Flat bar, in Ø 8 – 300 mm.
What is O1 used for?
Typical applications include Gauges, Cutting tools, Blanking dies, Woodworking tools.