Materials & Finishing
Hardness Conversion Chart
Approximate conversions between common hardness scales for steel. These are widely-used approximations (in the style of ASTM E140) — actual conversion depends on material and test conditions, so treat this as a quick-reference guide, not a certified conversion.
| Rockwell C (HRC) | Brinell (HB) | Vickers (HV) |
|---|---|---|
| 20 | 226 | 238 |
| 30 | 286 | 302 |
| 40 | 371 | 392 |
| 50 | 481 | 513 |
| 60 | 613 | 654 |
Reference values only. Verify against the current governing standard (e.g. ISO, ANSI, ASME, DIN) before using in production drawings or manufacturing. Provided by Micro Components as a free engineering resource.
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