ISO-based standards and tolerances for critical dimensional features of the evaluated gear
| Feature | ISO standard | Symbol | Tolerance class | Tolerance (±mm) |
|---|---|---|---|---|
| Upper hub diameter | ISO 2768–1 | da | Medium (m) | ±0.2–0.3 |
| Lower hub diameter | ISO 2768–1 | df | Medium (m) | ±0.2–0.3 |
| Gear height | ISO 2768–1 | b | Medium (m) | ±0.2–0.3 |
| Bore diameter | ISO 286–1 / 2 | dB | H7 (hole), h6 (shaft) | ±0.021 (H7) |
| Tooth thickness at pitch circle | ISO 1328–1 | s | Quality Grade 8–10 | ±0.02–0.1 |
| Circular pitch | ISO 1328–1 | p | Quality Grade 8–10 | ±0.02–0.1 |
| Upper hub height | ISO 2768–1 | h | Medium (m) | ±0.2–0.3 |
| Lower hub height | ISO 2768–1 | df | Medium (m) | ±0.1–0.2 |
| Keyway width | ISO 286–2 | wk | P9 (shaft keyway) | ±0.043 |
| Keyway length | ISO 2768–1 | lk | Medium (m) | ±0.2–0.3 |
| Feature | Symbol | Tolerance class | Tolerance (±mm) | |
|---|---|---|---|---|
| da | Medium (m) | ±0.2–0.3 | ||
| df | Medium (m) | ±0.2–0.3 | ||
| b | Medium (m) | ±0.2–0.3 | ||
| dB | H7 (hole), h6 (shaft) | ±0.021 (H7) | ||
| s | Quality Grade 8–10 | ±0.02–0.1 | ||
| p | Quality Grade 8–10 | ±0.02–0.1 | ||
| h | Medium (m) | ±0.2–0.3 | ||
| df | Medium (m) | ±0.1–0.2 | ||
| wk | P9 (shaft keyway) | ±0.043 | ||
| lk | Medium (m) | ±0.2–0.3 |
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