VT machining offers CNC Turning for O1 Tool Steel (UNS T31501 / 1.2510 / SKS3), typically supplied annealed or hardened. Oil-hardening, easiest tool steel to machine.
CNC Turning Notes for O1 Tool Steel
O1 Tool Steel turns with good chip control at standard cutting data.
For estimating, a 100 × 100 × 10 mm block of O1 Tool Steel weighs about 0.78 kg.
Starting Parameters for CNC Turning O1 Tool Steel
| Cutting speed (carbide) | 160-290 m/min |
|---|---|
| Feed | 0.08-0.25 mm/rev |
| Spindle speed, Ø25 mm bar | 2040-3690 rpm |
| Insert / tool class | ISO P — CVD-coated carbide |
| Coolant | Emulsion; neat oil for tapping |
Starting values for O1 Tool Steel, Annealed or hardened; optimised on the first article.
O1 Tool Steel Data Relevant to CNC Turning
| 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 Turning Alloy Steel
Finishing options, quality documentation and general cnc turning guidance for all alloy steel grades are on our CNC Turning Alloy Steel page.
No drawing yet? Sketch the part in our free 3D + 2D builder and send it with your RFQ.
Quoting CNC Turning 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
Related
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
Why is O1 Tool Steel a good choice for CNC Turning?
O1 Tool Steel is wear-resistant and hardenable for tooling, which makes it well suited to CNC Turning. We tune the process to the alloy so the finished O1 Tool Steel turning part meets your dimensional and functional requirements.
Does CNC Turning O1 Tool Steel require dedicated tooling?
Most O1 Tool Steel turning work uses standard cutting tools and CNC programs; dedicated fixtures are made only when geometry or volume requires them.
Which industries use CNC Turning O1 Tool Steel parts?
CNC Turning O1 Tool Steel parts are used across aerospace, medical, automotive, electronics, semiconductor and general industrial sectors — anywhere precise O1 Tool Steel components are required.
What material thickness or size range suits CNC Turning O1 Tool Steel?
Turned O1 Tool Steel parts are produced from bar or chuck stock across a wide diameter range.
Can VT machining make custom O1 Tool Steel parts to my drawing?
Yes. O1 Tool Steel turning 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.