H9/d9 fit — Free running fit
ISO 286 hole-basis clearance fit. Enter a nominal size to get the limits.
Result
| Upper | Lower | Max | Min | Tol. | |
|---|---|---|---|---|---|
| Hole H9 | +0.052 | 0 | 25.052 | 25.000 | |
| Shaft d9 | −0.065 | −0.117 | 24.935 | 24.883 |
- Max clearance
- 0.169 mm
- Min clearance
- 0.065 mm
- Mean
- +0.117 mm
Fit diagram (µm · zero line = nominal)
About H9/d9
Shafts running in plain bearings with wide temperature variation, high speed or heavy journal pressure.
At Ø25 mm the hole H9 measures 0 mm to +0.052 mm and the shaft d9 −0.117 mm to −0.065 mm, giving a clearance of 0.065 mm to 0.169 mm.
How the limits are calculated
Hole H9: fundamental deviation EI = 0, standard tolerance IT9 = 52 µm for 18–30 mm. Shaft d9: fundamental deviation es = -65 µm, IT9 = 52 µm. Clearance = hole − shaft, evaluated at both extremes. Values per ISO 286-1:2010.
H9/d9 limits by size range
| Size (mm) | Hole H9 | Shaft d9 | Clearance min | Clearance max |
|---|---|---|---|---|
| ≤ 3 | +0.025 / 0 | −0.020 / −0.045 | +0.020 | +0.070 |
| 3 – 6 | +0.030 / 0 | −0.030 / −0.060 | +0.030 | +0.090 |
| 6 – 10 | +0.036 / 0 | −0.040 / −0.076 | +0.040 | +0.112 |
| 10 – 18 | +0.043 / 0 | −0.050 / −0.093 | +0.050 | +0.136 |
| 18 – 30 | +0.052 / 0 | −0.065 / −0.117 | +0.065 | +0.169 |
| 30 – 50 | +0.062 / 0 | −0.080 / −0.142 | +0.080 | +0.204 |
| 50 – 80 | +0.074 / 0 | −0.100 / −0.174 | +0.100 | +0.248 |
| 80 – 120 | +0.087 / 0 | −0.120 / −0.207 | +0.120 | +0.294 |
| 120 – 180 | +0.100 / 0 | −0.145 / −0.245 | +0.145 | +0.345 |
| 180 – 250 | +0.115 / 0 | −0.170 / −0.285 | +0.170 | +0.400 |
| 250 – 315 | +0.130 / 0 | −0.190 / −0.320 | +0.190 | +0.450 |
| 315 – 400 | +0.140 / 0 | −0.210 / −0.350 | +0.210 | +0.490 |
| 400 – 500 | +0.155 / 0 | −0.230 / −0.385 | +0.230 | +0.540 |
Deviations in mm at the upper end of each range; negative clearance = interference. Clearance columns are shown on wider screens. Sub-ranges (e.g. 18–24 / 24–30) can differ for r, s, t, u, v, x, y, z — use the calculator for the exact size.