H6/p5 fit — Precision interference

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

Nominal size

Unit

Result

Ø25.000 H6/p5Interference fit

	Upper	Lower	Max	Min	Tol.
Hole H6	+0.013	0	25.013	25.000	0.013
Shaft p5	+0.031	+0.022	25.031	25.022	0.009

Max interference: 0.031 mm
Min interference: 0.009 mm
Mean: −0.020 mm

Fit diagram (µm · zero line = nominal)

Hole tolerance zoneShaft tolerance zoneInterference

About H6/p5

Precision locational press fit, e.g. bushes in instrument housings.

At Ø25 mm the hole H6 measures 0 mm to +0.013 mm and the shaft p5 +0.022 mm to +0.031 mm, giving an interference of 0.009 mm to 0.031 mm.

How the limits are calculated

Hole H6: fundamental deviation EI = 0, standard tolerance IT6 = 13 µm for 18–30 mm. Shaft p5: fundamental deviation ei = 22 µm, IT5 = 9 µm. Clearance = hole − shaft, evaluated at both extremes. Values per ISO 286-1:2010.

H6/p5 limits by size range

Size (mm)	Hole H6	Shaft p5	Clearance min	Clearance max
≤ 3	+0.006 / 0	+0.010 / +0.006	−0.010	0
3 – 6	+0.008 / 0	+0.017 / +0.012	−0.017	−0.004
6 – 10	+0.009 / 0	+0.021 / +0.015	−0.021	−0.006
10 – 18	+0.011 / 0	+0.026 / +0.018	−0.026	−0.007
18 – 30	+0.013 / 0	+0.031 / +0.022	−0.031	−0.009
30 – 50	+0.016 / 0	+0.037 / +0.026	−0.037	−0.010
50 – 80	+0.019 / 0	+0.045 / +0.032	−0.045	−0.013
80 – 120	+0.022 / 0	+0.052 / +0.037	−0.052	−0.015
120 – 180	+0.025 / 0	+0.061 / +0.043	−0.061	−0.018
180 – 250	+0.029 / 0	+0.070 / +0.050	−0.070	−0.021
250 – 315	+0.032 / 0	+0.079 / +0.056	−0.079	−0.024
315 – 400	+0.036 / 0	+0.087 / +0.062	−0.087	−0.026
400 – 500	+0.040 / 0	+0.095 / +0.068	−0.095	−0.028

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.