M35
Data verifiedM35 is M2 with about 5% cobalt added, the most popular cobalt high-speed steel worldwide. The cobalt raises red hardness so tools keep cutting at the higher speeds and feeds used on stainless and alloy steels.
Chemical composition
| Element | Content (%) |
|---|---|
| C | 0.87–0.95 |
| Si | ≤0.45 |
| Mn | ≤0.40 |
| Cr | 3.75–4.50 |
| Mo | 4.70–5.20 |
| W | 5.90–6.70 |
| V | 1.70–2.10 |
| Co | 4.50–5.00 |
Weight percent, per the governing standard ranges. Actual values per heat are on the mill certificate.
Properties
| Delivery condition | Annealed |
| Hardness (hardened) | 63–66 HRC |
| Density | 8.10 g/cm³ |
| Red hardness | Higher than M2 (5% cobalt) |
Heat treatment
Preheat 850 °C; harden 1190–1220 °C; triple temper 540–560 °C.
Equivalent grades
| Standard | Designation |
|---|---|
| din | 1.3243 |
| aisi | M35 |
| jis | SKH55 |
| gb | W6Mo5Cr4V2Co5 |
Compare side by side: M35 vs M2 · M35 vs M42
Equivalents overlap in chemistry and use but are not always identical — see our equivalents guide before substituting in certified designs.
Applications & Processing
Applications: Drills and end mills for stainless steel, taps, broaches, saws for difficult alloys.
Processing: Grinds a little harder than M2 and costs more; the step up from M2 when tool life is heat-limited rather than wear-limited.
FAQ
- M35 or M42?
- M42 has more cobalt (~8%) and molybdenum, with higher hardness (67–70 HRC) for the hardest cutting; M35 is tougher and cheaper for general cobalt-HSS duty.
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Ask for a quotationVisit NasteelSource: ASTM A600 / EN ISO 4957 published ranges · Last updated 2026-11-03. Data is indicative — verify critical values against the governing standard and mill certificate before use.