H7/h6 fit: locational clearance fit
Parts that must be located accurately but can still be assembled and taken apart freely: stationary bushings, fixture locators, hubs that are clamped separately.
| Nominal size (mm) | Hole H7 (µm) | Shaft h6 (µm) | Max. clearance (µm) | Min. clearance (µm) |
|---|---|---|---|---|
| 1–3 | +10 / 0 | 0 / -6 | +16 | 0 |
| >3–6 | +12 / 0 | 0 / -8 | +20 | 0 |
| >6–10 | +15 / 0 | 0 / -9 | +24 | 0 |
| >10–18 | +18 / 0 | 0 / -11 | +29 | 0 |
| >18–30 | +21 / 0 | 0 / -13 | +34 | 0 |
| >30–50 | +25 / 0 | 0 / -16 | +41 | 0 |
| >50–80 | +30 / 0 | 0 / -19 | +49 | 0 |
| >80–120 | +35 / 0 | 0 / -22 | +57 | 0 |
Negative clearance means interference. Example: a Ø20 H7/h6 fit has a hole of 20.000–20.021 mm and a shaft of 19.987–20.000 mm.
On the drawing
Write the fit after the size: Ø20 H7 on the hole and Ø20 h6 on the shaft. Shops ream H7 holes routinely; tight shaft grades usually need fine turning or grinding.
Draw your own part
Drop a STEP file into DrawMyPart. It finds every body, asks you to confirm threads, fits and tolerances, and draws a sheet your manufacturer can build from.
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