O1 Tool Steel | DIN 1.2510 | Supplier & Exporter – Nifty Alloys

We supply and export O1 Tool Steel in plates, sheets, bars, blocks, and flats to industries across the world. A cold-work oil-hardening tool steel, O1 has good wear resistance, toughness, and machinability, as well as high dimensional stability following heat treatment.

If you're searching for a reliable steel grade for gauges, punches, knives, or dies, O1 Tool Steel is your affordable option. With ISO-certified quality, fast delivery, and custom sizes, Nifty Alloys is the partner of choice for O1 Tool Steel.

What is O1 Tool Steel?

O1 Tool Steel is a cold-work, oil-hardening tool steel that delivers a balance of toughness, wear resistance, and machinability. Unlike air-hardening grades such as A2, O1 hardens in oil, which minimizes distortion and provides excellent dimensional stability.

Because of its affordable cost and ease of machining, O1 is one of the most widely used tool steels for general-purpose tooling.

• Also known as: DIN 1.2510, JIS SKS3, EN 90MnCrV8
• Category: Cold Work Tool Steel
• Hardness: 57–62 HRC after heat treatment
   

Key Features & Properties of O1 Tool Steel

• Hardness – Can achieve up to 62 HRC after heat treatment.
• Excellent Wear Resistance – Ensures long tool life under high-friction applications.
• Good Machinability – Easy to machine in the annealed condition.
• Dimensional Stability – Retains shape and size after heat treatment.
• Balanced Toughness & Strength – Suitable for demanding applications like cutting tools and dies.

These properties make O1 Tool Steel a go-to choice for precision toolmakers.
 

Comparison: O1 Tool Steel vs D2 Tool Steel

• O1 Tool Steel → Easier to machine, oil-hardening, economical, moderate wear resistance.
• D2 Tool Steel → Air-hardening, superior wear resistance, higher chromium content, better for heavy-duty tools.

Depending on your application, our experts at Nifty Alloys can recommend the best tool steel grade for your requirement.