M7/h6 fit — Locational transition (shaft basis)

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

Nominal size

Unit

Result

Ø25.000 M7/h6Transition fit

	Upper	Lower	Max	Min	Tol.
Hole M7	0	−0.021	25.000	24.979	0.021
Shaft h6	0	−0.013	25.000	24.987	0.013

Max clearance: 0.013 mm
Max interference: 0.021 mm
Mean: −0.004 mm

Fit diagram (µm · zero line = nominal)

Hole tolerance zoneShaft tolerance zoneClearanceInterference

About M7/h6

Shaft-basis equivalent of H7/m6.

At Ø25 mm the hole M7 measures −0.021 mm to 0 mm and the shaft h6 −0.013 mm to 0 mm, giving between 0.021 mm interference and 0.013 mm clearance.

How the limits are calculated

Hole M7: 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.

M7/h6 limits by size range

Size (mm)	Hole M7	Shaft h6	Clearance min	Clearance max
≤ 3	−0.002 / −0.012	0 / −0.006	−0.012	+0.004
3 – 6	0 / −0.012	0 / −0.008	−0.012	+0.008
6 – 10	0 / −0.015	0 / −0.009	−0.015	+0.009
10 – 18	0 / −0.018	0 / −0.011	−0.018	+0.011
18 – 30	0 / −0.021	0 / −0.013	−0.021	+0.013
30 – 50	0 / −0.025	0 / −0.016	−0.025	+0.016
50 – 80	0 / −0.030	0 / −0.019	−0.030	+0.019
80 – 120	0 / −0.035	0 / −0.022	−0.035	+0.022
120 – 180	0 / −0.040	0 / −0.025	−0.040	+0.025
180 – 250	0 / −0.046	0 / −0.029	−0.046	+0.029
250 – 315	0 / −0.052	0 / −0.032	−0.052	+0.032
315 – 400	0 / −0.057	0 / −0.036	−0.057	+0.036
400 – 500	0 / −0.063	0 / −0.040	−0.063	+0.040

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.