H6/m5 fit — Precision transition

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

Nominal size

Unit

Result

Ø25.000 H6/m5Transition fit

	Upper	Lower	Max	Min	Tol.
Hole H6	+0.013	0	25.013	25.000	0.013
Shaft m5	+0.017	+0.008	25.017	25.008	0.009

Max clearance: 0.005 mm
Max interference: 0.017 mm
Mean: −0.006 mm

Fit diagram (µm · zero line = nominal)

Hole tolerance zoneShaft tolerance zoneClearanceInterference

About H6/m5

Precision fit resisting movement, assembled with a light press.

At Ø25 mm the hole H6 measures 0 mm to +0.013 mm and the shaft m5 +0.008 mm to +0.017 mm, giving between 0.017 mm interference and 0.005 mm clearance.

How the limits are calculated

Hole H6: fundamental deviation EI = 0, standard tolerance IT6 = 13 µm for 18–30 mm. Shaft m5: fundamental deviation ei = 8 µm, IT5 = 9 µm. Clearance = hole − shaft, evaluated at both extremes. Values per ISO 286-1:2010.

H6/m5 limits by size range

Size (mm)	Hole H6	Shaft m5	Clearance min	Clearance max
≤ 3	+0.006 / 0	+0.006 / +0.002	−0.006	+0.004
3 – 6	+0.008 / 0	+0.009 / +0.004	−0.009	+0.004
6 – 10	+0.009 / 0	+0.012 / +0.006	−0.012	+0.003
10 – 18	+0.011 / 0	+0.015 / +0.007	−0.015	+0.004
18 – 30	+0.013 / 0	+0.017 / +0.008	−0.017	+0.005
30 – 50	+0.016 / 0	+0.020 / +0.009	−0.020	+0.007
50 – 80	+0.019 / 0	+0.024 / +0.011	−0.024	+0.008
80 – 120	+0.022 / 0	+0.028 / +0.013	−0.028	+0.009
120 – 180	+0.025 / 0	+0.033 / +0.015	−0.033	+0.010
180 – 250	+0.029 / 0	+0.037 / +0.017	−0.037	+0.012
250 – 315	+0.032 / 0	+0.043 / +0.020	−0.043	+0.012
315 – 400	+0.036 / 0	+0.046 / +0.021	−0.046	+0.015
400 – 500	+0.040 / 0	+0.050 / +0.023	−0.050	+0.017

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.