HS6-5-2
1.3343The most widely used high-speed steel worldwide, known as AISI M2. Contains 6% W, 5% Mo and 2% V providing excellent red hardness (retains cutting ability at 600°C+), high wear resistance and good toughness. Hardened to 62–65 HRC. Standard material for twist drills, milling cutters, taps, reamers, broaches, saw blades, cold forming tools and punches. PM (powder metallurgy) variants available for improved toughness and grindability.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | AISI | USA | M2 | T11302 | REF |
| 🇯🇵 | JIS | Japan | SKH51 | — | 95% |
Sources: ASTM A600, JIS G4403
Mechanical properties
Compatibility verdict
HS6-5-2 and SKH51: 95% composition match
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