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High Speed Steel Equivalent Chart
High Speed Steel KS Specifications — 2 sizes
KS D 3522
SKH51 (KS/JIS) = HS6-5-2 (DIN) = M2 (ANSI): equivalent high-speed tool steels. The global standard material for drills, end mills, and taps.
Practical Notes
- SKH51 (M2) maintains hardness at ~550°C — suitable for high-speed cutting. Standard material for drills, end mills, and taps.
- Higher toughness than carbide (WC) — advantageous in interrupted cuts or vibration. Consider HSS where carbide fractures.
KSHigh Speed Steel
2 sizes| KS | JIS | DIN | ANSI/ASTM | Category | Note |
|---|---|---|---|---|---|
| SKH51 | SKH51 | HS6-5-2 | M2 | Tool Steel | Drilling·· |
| SKH55 | SKH55 | HS6-5-2-5 | M35 | Tool Steel | Cobalt Containing High Hardness |
Key Features
- SKH51 (M2) representative; W/Mo/V/Co alloys maintain HRC 60+ at 600 °C (red hardness)
- Cutting edge hardness persists without softening from friction heat during high-speed cutting
- Powder metallurgy HSS (PM-HSS) uniformly disperses carbides, improving both toughness and tool life
Key Applications
Drills, taps, end mills, hobs, broaches, metal saw blades, punch pins, thread rolling dies
FAQ
Difference between HSS and carbide (WC)?
HSS has higher toughness (shock-resistant) but lower hardness and heat resistance than carbide. Carbide is harder and heat-resistant but brittle. Interrupted cuts→HSS; continuous high-speed→carbide.