P7/h6 fit — Locational interference (shaft basis)

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

Nominal size

Unit

Result

Ø25.000 P7/h6Interference fit

	Upper	Lower	Max	Min	Tol.
Hole P7	−0.014	−0.035	24.986	24.965	0.021
Shaft h6	0	−0.013	25.000	24.987	0.013

Max interference: 0.035 mm
Min interference: 0.001 mm
Mean: −0.018 mm

Fit diagram (µm · zero line = nominal)

Hole tolerance zoneShaft tolerance zoneInterference

About P7/h6

Shaft-basis equivalent of H7/p6.

At Ø25 mm the hole P7 measures −0.035 mm to −0.014 mm and the shaft h6 −0.013 mm to 0 mm, giving an interference of 0.001 mm to 0.035 mm.

How the limits are calculated

Hole P7: 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.

P7/h6 limits by size range

Size (mm)	Hole P7	Shaft h6	Clearance min	Clearance max
≤ 3	−0.006 / −0.016	0 / −0.006	−0.016	0
3 – 6	−0.008 / −0.020	0 / −0.008	−0.020	0
6 – 10	−0.009 / −0.024	0 / −0.009	−0.024	0
10 – 18	−0.011 / −0.029	0 / −0.011	−0.029	0
18 – 30	−0.014 / −0.035	0 / −0.013	−0.035	−0.001
30 – 50	−0.017 / −0.042	0 / −0.016	−0.042	−0.001
50 – 80	−0.021 / −0.051	0 / −0.019	−0.051	−0.002
80 – 120	−0.024 / −0.059	0 / −0.022	−0.059	−0.002
120 – 180	−0.028 / −0.068	0 / −0.025	−0.068	−0.003
180 – 250	−0.033 / −0.079	0 / −0.029	−0.079	−0.004
250 – 315	−0.036 / −0.088	0 / −0.032	−0.088	−0.004
315 – 400	−0.041 / −0.098	0 / −0.036	−0.098	−0.005
400 – 500	−0.045 / −0.108	0 / −0.040	−0.108	−0.005

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.