Comparison
| Defining property | AISI-SAE grade | Significant characteristics |
|---|---|---|
| Water-hardening | W | |
| Cold-working | O | Oil-hardening |
| A | Air-hardening; medium alloy | |
| D | High carbon; high chromium | |
| Shock resisting | S | |
| High speed | T | Tungsten base |
| M | Molybdenum base | |
| Hot-working | H | H1–H19: chromium base H20–H39: tungsten base H40–H59: molybdenum base |
| Plastic mold | P | |
| Special purpose | L | Low alloy |
| F | Carbon tungsten |
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