O1 / 100MnCrW4
1.2510Oil-hardening cold-work tool steel. Good balance of wear resistance, toughness, and machinability at moderate cost. Very predictable heat treatment response. The standard choice for hand tools, gauges, jigs, fixtures, taps, reamers, and general precision tooling.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | AISI O1 | T31501 | REF |
| 🇪🇺 | EN | Europe | 100MnCrW4 | 1.2510 | 100% |
| 🇯🇵 | JIS | Japan | SKS3 | — | 90% |
Sources: ASTM A681, EN ISO 4957, JIS G4404
Mechanical properties
Compatibility verdict
O1 / 100MnCrW4 and SKS3: 90% composition match
Related materials
X210Cr12
1.2080High-carbon high-chromium cold-work tool steel. Excellent wear resistance and dimensional stability after heat treatment. Used for blanking and forming dies, drawing mandrels, gauges, shear blades, and thread rolling dies. Not suitable for impact loading.
D2 / X155CrVMo12-1
1.2379Premium high-carbon high-chromium cold-work tool steel with vanadium and molybdenum. Air-hardening with minimal distortion. Superior wear resistance and edge retention. The global benchmark for cold stamping dies, blanking tools, shear blades, and forming tools.
P20 / 40CrMnMo7
1.2311Pre-hardened plastic mold steel (usually delivered at 28-34 HRC). The most widely used mold base steel globally. Good machinability in pre-hardened condition, good polishability. Used for injection molds, die-casting dies, extrusion tooling, and structural mold components.
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