F7/h6 fit — Close running fit (shaft basis)

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

Nominal size

Unit

Result

Ø25.000 F7/h6Clearance fit

	Upper	Lower	Max	Min	Tol.
Hole F7	+0.041	+0.020	25.041	25.020	0.021
Shaft h6	0	−0.013	25.000	24.987	0.013

Max clearance: 0.054 mm
Min clearance: 0.020 mm
Mean: +0.037 mm

Fit diagram (µm · zero line = nominal)

Hole tolerance zoneShaft tolerance zoneClearance

About F7/h6

Shaft-basis equivalent of H7/f7.

At Ø25 mm the hole F7 measures +0.020 mm to +0.041 mm and the shaft h6 −0.013 mm to 0 mm, giving a clearance of 0.020 mm to 0.054 mm.

How the limits are calculated

Hole F7: fundamental deviation ES/EI per ISO 286-1 Table 2, standard tolerance IT7 = 21 µm for 18–30 mm. Shaft h6: fundamental deviation es = 0, IT6 = 13 µm. Clearance = hole − shaft, evaluated at both extremes. Values per ISO 286-1:2010.

F7/h6 limits by size range

Size (mm)	Hole F7	Shaft h6	Clearance min	Clearance max
≤ 3	+0.016 / +0.006	0 / −0.006	+0.006	+0.022
3 – 6	+0.022 / +0.010	0 / −0.008	+0.010	+0.030
6 – 10	+0.028 / +0.013	0 / −0.009	+0.013	+0.037
10 – 18	+0.034 / +0.016	0 / −0.011	+0.016	+0.045
18 – 30	+0.041 / +0.020	0 / −0.013	+0.020	+0.054
30 – 50	+0.050 / +0.025	0 / −0.016	+0.025	+0.066
50 – 80	+0.060 / +0.030	0 / −0.019	+0.030	+0.079
80 – 120	+0.071 / +0.036	0 / −0.022	+0.036	+0.093
120 – 180	+0.083 / +0.043	0 / −0.025	+0.043	+0.108
180 – 250	+0.096 / +0.050	0 / −0.029	+0.050	+0.125
250 – 315	+0.108 / +0.056	0 / −0.032	+0.056	+0.140
315 – 400	+0.119 / +0.062	0 / −0.036	+0.062	+0.155
400 – 500	+0.131 / +0.068	0 / −0.040	+0.068	+0.171

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.