H6/n5 fit — Precision interference

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

Nominal size

Unit

Result

Ø25.000 H6/n5Interference fit

	Upper	Lower	Max	Min	Tol.
Hole H6	+0.013	0	25.013	25.000	0.013
Shaft n5	+0.024	+0.015	25.024	25.015	0.009

Max interference: 0.024 mm
Min interference: 0.002 mm
Mean: −0.013 mm

Fit diagram (µm · zero line = nominal)

Hole tolerance zoneShaft tolerance zoneInterference

About H6/n5

Light press fit for precision parts that must not move.

At Ø25 mm the hole H6 measures 0 mm to +0.013 mm and the shaft n5 +0.015 mm to +0.024 mm, giving an interference of 0.002 mm to 0.024 mm.

How the limits are calculated

Hole H6: fundamental deviation EI = 0, standard tolerance IT6 = 13 µm for 18–30 mm. Shaft n5: fundamental deviation ei = 15 µm, IT5 = 9 µm. Clearance = hole − shaft, evaluated at both extremes. Values per ISO 286-1:2010.

H6/n5 limits by size range

Size (mm)	Hole H6	Shaft n5	Clearance min	Clearance max
≤ 3	+0.006 / 0	+0.008 / +0.004	−0.008	+0.002
3 – 6	+0.008 / 0	+0.013 / +0.008	−0.013	0
6 – 10	+0.009 / 0	+0.016 / +0.010	−0.016	−0.001
10 – 18	+0.011 / 0	+0.020 / +0.012	−0.020	−0.001
18 – 30	+0.013 / 0	+0.024 / +0.015	−0.024	−0.002
30 – 50	+0.016 / 0	+0.028 / +0.017	−0.028	−0.001
50 – 80	+0.019 / 0	+0.033 / +0.020	−0.033	−0.001
80 – 120	+0.022 / 0	+0.038 / +0.023	−0.038	−0.001
120 – 180	+0.025 / 0	+0.045 / +0.027	−0.045	−0.002
180 – 250	+0.029 / 0	+0.051 / +0.031	−0.051	−0.002
250 – 315	+0.032 / 0	+0.057 / +0.034	−0.057	−0.002
315 – 400	+0.036 / 0	+0.062 / +0.037	−0.062	−0.001
400 – 500	+0.040 / 0	+0.067 / +0.040	−0.067	0

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.