D9/h9 fit — Free running fit (shaft basis)

ISO 286 shaft-basis clearance fit. Enter a nominal size to get the limits.

Nominal size

Unit

Result

Ø25.000 D9/h9Clearance fit

	Upper	Lower	Max	Min	Tol.
Hole D9	+0.117	+0.065	25.117	25.065	0.052
Shaft h9	0	−0.052	25.000	24.948	0.052

Max clearance: 0.169 mm
Min clearance: 0.065 mm
Mean: +0.117 mm

Fit diagram (µm · zero line = nominal)

Hole tolerance zoneShaft tolerance zoneClearance

About D9/h9

Shaft-basis equivalent of H9/d9, used when several parts with different fits sit on one plain shaft.

At Ø25 mm the hole D9 measures +0.065 mm to +0.117 mm and the shaft h9 −0.052 mm to 0 mm, giving a clearance of 0.065 mm to 0.169 mm.

How the limits are calculated

Hole D9: fundamental deviation ES/EI per ISO 286-1 Table 2, standard tolerance IT9 = 52 µm for 18–30 mm. Shaft h9: fundamental deviation es = 0, IT9 = 52 µm. Clearance = hole − shaft, evaluated at both extremes. Values per ISO 286-1:2010.

D9/h9 limits by size range

Size (mm)	Hole D9	Shaft h9	Clearance min	Clearance max
≤ 3	+0.045 / +0.020	0 / −0.025	+0.020	+0.070
3 – 6	+0.060 / +0.030	0 / −0.030	+0.030	+0.090
6 – 10	+0.076 / +0.040	0 / −0.036	+0.040	+0.112
10 – 18	+0.093 / +0.050	0 / −0.043	+0.050	+0.136
18 – 30	+0.117 / +0.065	0 / −0.052	+0.065	+0.169
30 – 50	+0.142 / +0.080	0 / −0.062	+0.080	+0.204
50 – 80	+0.174 / +0.100	0 / −0.074	+0.100	+0.248
80 – 120	+0.207 / +0.120	0 / −0.087	+0.120	+0.294
120 – 180	+0.245 / +0.145	0 / −0.100	+0.145	+0.345
180 – 250	+0.285 / +0.170	0 / −0.115	+0.170	+0.400
250 – 315	+0.320 / +0.190	0 / −0.130	+0.190	+0.450
315 – 400	+0.350 / +0.210	0 / −0.140	+0.210	+0.490
400 – 500	+0.385 / +0.230	0 / −0.155	+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.