M42 High-Speed Steel
1.3247 (M42)
Sourced upon request
- EN1.3247
- ENHS2-9-1-8
- AISIM42
Molybdenum-based super high-speed steel with 8% cobalt. Hardens to 66–70 HRC; hot hardness and wear resistance exceed M2 and M35. Preferred for cutting hard and difficult-to-machine materials. Sourced upon request.
01Material Properties
- Superior hot hardness thanks to high cobalt content
- Working hardness 66–70 HRC
- High wear resistance
- Lower toughness than M2; care needed in interrupted cutting
- Suitable for PVD coating
02Applications
- Machining of hard and heat-treated materials
- Drills and end mills for stainless and titanium alloys
- Taps, reamers, broaches
- High-performance saw blades
03Delivery Condition
- Annealed approx. 260–300 HB; 66–70 HRC after heat treatment
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