Carbide end mills for hardened steel
The solid carbide end mill series listed in our catalogue for hardened materials (ISO H) – from micro diameters to roughing, with hardness limits and 2026 catalogue cutting data.
For hardened steel, tool choice depends on part hardness, the tool’s catalogue hardness limit, the coating and the reach required. The table below lists the Geppetto end mills whose application range includes hardened materials.
Quick selection guide
- Micro diameters and fine details: MST series (TiSiN).
- Corner-radius precision work: MCR series.
- Roughing: MC, MC (Z4) and MRS (Z6).
- Deep areas: MCL (Z4/Z6) and MRC long-neck roughing series.
Get a quote / Send a drawing
Subject: Carbide end mills for hardened steel. Message us on WhatsApp or by e-mail and attach your drawing or a dimensioned sketch. The product/page name is added automatically – just add material, size and quantity.
- 1Drawing or dimensions
- 2Material and quantity
- 3Quote and feasibility reply
Compare the series
| Series | Diameter | Z | Coating | Helix angle | Hardness | Cutting data · ISO H |
|---|---|---|---|---|---|---|
| MST (Z4)Plain cutting edge, standard length | Ø1,5 - Ø5 | 4 | TiSiN | 45° | <56 HRC | n (rpm): 5330–21600 Vf (mm/min): 165–900 |
| MCRCorner radius, standard length | Ø2 - Ø12 | 3-4 | TiSiN | – | – | – |
| MC (Z6)High-performance roughing end mills | Ø6 - Ø20 | 6 | TiSiN | ~45° | <56 HRC | n (rpm): 300–1600 Vf (mm/min): 60–200 |
| MC (Z4)High-performance roughing end mills | Ø6 - Ø20 | 4 | AlCrN | ~45° | <56 HRC | n (rpm): 300–1600 Vf (mm/min): 60–200 |
| MRS (Z6)Serrated (chip-breaker) roughing end mills | Ø6 - Ø20 | 6 | AlCrN | ~45° | <56 HRC | Vc (m/min): 30–60 fz (mm/tooth): 0.006–0.36 |
| MCL (Z4)Long neck roughing end mills | Ø3 - Ø16 | 4 | AlTiN | ~45° | <56 HRC | n (rpm): 330–1400 Vf (mm/min): 120–250 |
| MCL (Z6)Long neck roughing end mills | Ø6 - Ø20 | 6 | TiSiN | ~45° | <56 HRC | n (rpm): 330–1400 Vf (mm/min): 120–250 |
| MRC (Z4)Long reach roughing, corner radius | Ø6 - Ø20 | 4 | TiSiN | ~45° | <56 HRC | – |
Values are starting recommendations; adjust them to machine rigidity, clamping, tool length and coolant.
MST Series
Plain cutting edge, standard length
MCR Series
Corner radius, standard length
MC Series
High-performance roughing end mills
MC Series (Z4)
High-performance roughing end mills
MRS Series (Z6)
Serrated (chip-breaker) roughing end mills
MCL Series (Z4)
Long neck roughing end mills
MCL Series (Z6)
Long neck roughing end mills
MRC Series (Z4)
Long reach roughing, corner radius
Short video: manufacturing and regrinding
Solid carbide end mills, D32 · D52 · D82 internal coolant drills, reamers, custom step tools and regrinding on Walter Helitronic machines – a 32-second short video.
Frequently asked questions
Which series are suitable for milling hardened steel?
Our catalogue has 8 series for this application: MST (Z4), MCR, MC (Z6), MC (Z4), MRS (Z6), MCL (Z4), MCL (Z6), MRC (Z4). Overall diameter range: Ø1.5–Ø20 mm.
Which coatings are available in these series?
The series on this page are available with: TiSiN (extreme hardness), AlCrN (wear resistance), AlTiN (high heat resistance).
What cutting data does the catalogue give for ISO H?
According to the Product Catalogue 2026 tables (min–max): MRS (Z6): Vc (m/min) 30–60, fz (mm/tooth) 0.006–0.36. Values are starting recommendations; adjust them to your machine, clamping and coolant.
Up to what hardness can these series be used?
Hardness limits in the catalogue: <56 HRC: MST (Z4), MC (Z6), MC (Z4), MRS (Z6), MCL (Z4), MCL (Z6), MRC (Z4).
Which series for hardened steel at micro diameters?
The MST series – Ø1.5–Ø5 mm, Z4, TiSiN coated with a 45° helix – is listed in the catalogue for up to <56 HRC.
How do I get a quote or send a drawing?
Use the “Get a quote / Send a drawing” section on this page to write to us on WhatsApp (+90 537 777 96 44) or by e-mail (info@geppetto-tr.com); you can attach your drawing. The product or page name is added to your message automatically. You can also use the quote form.
Get a quote / Send a drawing
Subject: Carbide end mills for hardened steel. Message us on WhatsApp or by e-mail and attach your drawing or a dimensioned sketch. The product/page name is added automatically – just add material, size and quantity.
- 1Drawing or dimensions
- 2Material and quantity
- 3Quote and feasibility reply