S7/h6 fit — Medium drive fit (shaft basis)

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

Nominal size

Unit

Result

Ø25.000 S7/h6Interference fit

	Upper	Lower	Max	Min	Tol.
Hole S7	−0.027	−0.048	24.973	24.952	0.021
Shaft h6	0	−0.013	25.000	24.987	0.013

Max interference: 0.048 mm
Min interference: 0.014 mm
Mean: −0.031 mm

Fit diagram (µm · zero line = nominal)

Hole tolerance zoneShaft tolerance zoneInterference

About S7/h6

Shaft-basis equivalent of H7/s6.

At Ø25 mm the hole S7 measures −0.048 mm to −0.027 mm and the shaft h6 −0.013 mm to 0 mm, giving an interference of 0.014 mm to 0.048 mm.

How the limits are calculated

Hole S7: 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.

S7/h6 limits by size range

Size (mm)	Hole S7	Shaft h6	Clearance min	Clearance max
≤ 3	−0.014 / −0.024	0 / −0.006	−0.024	−0.008
3 – 6	−0.015 / −0.027	0 / −0.008	−0.027	−0.007
6 – 10	−0.017 / −0.032	0 / −0.009	−0.032	−0.008
10 – 18	−0.021 / −0.039	0 / −0.011	−0.039	−0.010
18 – 30	−0.027 / −0.048	0 / −0.013	−0.048	−0.014
30 – 50	−0.034 / −0.059	0 / −0.016	−0.059	−0.018
50 – 80	−0.048 / −0.078	0 / −0.019	−0.078	−0.029
80 – 120	−0.066 / −0.101	0 / −0.022	−0.101	−0.044
120 – 180	−0.093 / −0.133	0 / −0.025	−0.133	−0.068
180 – 250	−0.123 / −0.169	0 / −0.029	−0.169	−0.094
250 – 315	−0.150 / −0.202	0 / −0.032	−0.202	−0.118
315 – 400	−0.187 / −0.244	0 / −0.036	−0.244	−0.151
400 – 500	−0.229 / −0.292	0 / −0.040	−0.292	−0.189

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.