Alloy & tool steel
1.2510 oil-hardening tool steel (100MnCrW4 / O1)
Oil-hardening cold-work tool steel for gauges, punches, small dies and blades; round bar.
1.2510, EN ISO 4957 name 100MnCrW4, is an oil-hardening cold-work tool steel; its American equivalent is O1. In the Iranian market it is known as 'amutit', a name taken from a manufacturer's trade name.
It reaches a high hardness with good dimensional stability when oil-quenched, and machines easily in the annealed state, which is why it is common for precision tools and smaller parts.
Equivalents
- Material number (DIN)
- 1.2510
- EN name
- 100MnCrW4
- Standard
- EN ISO 4957
- AISI/SAE (approx.)
- O1
- Iranian market name
- amutit, 2510
- Nominal density
- 7.85 kg/dm³
Chemical composition
| Element | Range (%) |
|---|---|
| C | 0.90–1.05 |
| Si | 0.10–0.40 |
| Mn | 1.00–1.20 |
| Cr | 0.50–0.70 |
| V | 0.05–0.15 |
| W | 0.50–0.70 |
Mass %, ranges of EN ISO 4957; the heat certificate of the delivered material is what the contract relies on.
Hardness and delivery state
Supplied annealed at 230 HB maximum; after machining it is oil-hardened and tempered. Round bar is usually cut to the length you need.
Heat treatment
Hardening with an oil quench, then low-temperature tempering; the working hardness is chosen for the tool.
Typical uses
- Gauges and measuring tools
- Punches and small blanking dies
- Industrial blades and knives
- Precision workshop tools
Delivery forms and size ranges
- Round bar
- Ø 57–100+ mm
The ranges the market offers, not a stock list. Rounds above about 100 mm are usually forged and traded in diameter bands.
Sizes and weights
Nominal weights at a density of 7.85 kg/dm³ (1.2510). The actual weight is weighed, and tool steel is usually sold by the weight of the cut piece.
| Diameter (mm) | kg per metre |
|---|---|
| Ø 60 | 22.2 |
| Ø 70 | 30.21 |
| Ø 80 | 39.46 |
| Ø 90 | 49.94 |
| Ø 100 | 61.65 |
What to include in your request
- Grade and material number, and the standard if your drawing requires one
- Form: round, flat or block, square or plate
- Exact size: diameter, width × thickness, or plate thickness
- Cut length, or the number and size of pieces, or full bars
- Delivery state: normalised, annealed, pre-hardened or quenched and tempered, turned
- Quantity in kg or tonnes, place and date of delivery
- Preferred origin (made in Iran or imported), if it matters to you
Documents you can ask for
- EN 10204 type 3.1 inspection certificate (heat analysis and hardness)
- Ultrasonic test (UT) report for forged sizes
- Hardness report for pre-hardened or quenched and tempered material
Frequently asked questions
What is 1.2510 steel?
1.2510, EN ISO 4957 name 100MnCrW4, is an oil-hardening cold-work tool steel; its American equivalent is O1. In the Iranian market it is known as 'amutit', a name taken from a manufacturer's trade name.
What is the density of 1.2510?
The nominal density of 1.2510 is about 7.85 kg/dm³ (g/cm³); the weight table on this page and the weight calculator use this value. The actual weight is weighed.
What is the equivalent of 1.2510?
1.2510 is listed in EN ISO 4957 as 100MnCrW4; its closest American equivalent is AISI O1. Equivalents are approximate: if your drawing requires a specific standard, name it in the request.
Is 'amutit' the same as 1.2510?
Yes: in the Iranian market 'amutit' is the usual name of the tool steel 1.2510 (100MnCrW4, O1). Give the material number when you order.
How do I get a quote for 1.2510?
Send the grade, form and size, the cut length or number of pieces, the delivery state and the documents you need. We review the request and send you an offer.