VT machining offers CNC Milling for O1 Tool Steel (UNS T31501 / 1.2510 / SKS3), typically supplied annealed or hardened. Oil-hardening, easiest tool steel to machine.
CNC Milling Notes for O1 Tool Steel
O1 Tool Steel mills well with conventional strategies; finishing passes are planned to meet flatness and finish callouts.
For estimating, a 100 × 100 × 10 mm block of O1 Tool Steel weighs about 0.78 kg.
Starting Parameters for CNC Milling O1 Tool Steel
| Cutting speed (carbide) | 135-245 m/min |
|---|---|
| Feed per tooth | 0.028-0.088 mm |
| Spindle speed, Ø10 mm end mill | 4300-7800 rpm |
| Insert / tool class | ISO P — CVD-coated carbide |
| Coolant | Emulsion; neat oil for tapping |
| Thermal growth, 100 mm part, +10 °C | 11 µm (CTE 11 µm/m·K) |
Starting values for O1 Tool Steel, Annealed or hardened; optimised on the first article.
O1 Tool Steel Data Relevant to CNC Milling
| Equivalent designations | UNS T31501 / 1.2510 / SKS3 |
|---|---|
| Key composition | C ~0.9%, Mn ~1.2%, Cr, W |
| Typical supply condition | Annealed or hardened |
| Hardness (typical) | ~200 HB annealed; 57-62 HRC hardened |
| Machinability rating | 90% (AISI B1112 = 100%) |
Typical values; we work to your drawing and mill certificate.
How O1 Tool Steel Differs
Oil-hardening, easiest tool steel to machine.
Typical applications: Gauges, punches, knives, short-run dies.
O1 Tool Steel vs Similar Grades
| O1 Tool Steel | H13 Tool Steel | D3 Tool Steel | D2 Tool Steel | |
|---|---|---|---|---|
| Key composition | C ~0.9%, Mn ~1.2%, Cr, W | C ~0.4%, Cr ~5%, Mo ~1.3%, V ~1% | C ~2.1%, Cr ~12% | C ~1.5%, Cr ~12%, Mo, V |
| Hardness | ~200 HB annealed; 57-62 HRC hardened | ~230 HB annealed; 44-52 HRC hardened | Up to ~64 HRC | ~255 HB annealed; 58-62 HRC hardened |
| Machinability % | 90 | 70 | 40 | 45 |
| Typical use | Gauges, punches, knives, short-run dies | Die-casting dies, extrusion tools, forging dies | Drawing dies, shear blades | Cutting dies, slitters, wear parts |
More on CNC Milling Alloy Steel
Finishing options, quality documentation and general cnc milling guidance for all alloy steel grades are on our CNC Milling Alloy Steel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Milling O1 Tool Steel
Send a STEP/IGES model or PDF drawing, confirm O1 Tool Steel and its condition (we usually see it supplied annealed or hardened), the quantity, critical tolerances and any finish or certificate requirements.
O1 Tool Steel in Other Processes
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Send the drawing, the O1 Tool Steel condition and the quantity — pricing and lead time come back the same or next business day.
Request a QuoteFrequently Asked Questions
How clean are the edges produced by CNC Milling on O1 Tool Steel?
Machined O1 Tool Steel edges are clean and to specification; edge-break or deburring is added when your drawing calls for it.
What is the typical lead time and minimum order for CNC Milling O1 Tool Steel?
CNC Milling prototypes for O1 Tool Steel can be produced quickly and scaled to series production. Send your drawing and quantity and we will advise lead time and any minimum order.
What is CNC Milling O1 Tool Steel and how is it done?
CNC Milling O1 Tool Steel refers to multi-axis milling cutters remove material to produce prismatic features, pockets, slots and contoured 3D surfaces. Applied to O1 Tool Steel — wear-resistant and hardenable for tooling — VT machining produces each part to your CAD drawing, selecting parameters from your tolerance, finish and quantity requirements.
What surface finish is achievable on O1 Tool Steel with CNC Milling?
Surface finish on O1 Tool Steel is controlled to your specification; we confirm the achievable Ra against your callout.
Does CNC Milling O1 Tool Steel require dedicated tooling?
Most O1 Tool Steel machining work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.
Can VT machining make custom O1 Tool Steel parts to my drawing?
Yes. O1 Tool Steel machining is made to order from your CAD/2D drawing. Share your geometry, material grade, tolerance and quantity and we will confirm feasibility, lead time and pricing.