H6/k5 fit — Precision transition

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

Nominal size

Unit

Result

Ø25.000 H6/k5Transition fit

	Upper	Lower	Max	Min	Tol.
Hole H6	+0.013	0	25.013	25.000	0.013
Shaft k5	+0.011	+0.002	25.011	25.002	0.009

Max clearance: 0.011 mm
Max interference: 0.011 mm
Mean: 0 mm

Fit diagram (µm · zero line = nominal)

Hole tolerance zoneShaft tolerance zoneClearanceInterference

About H6/k5

Precision push fit, e.g. ball-bearing inner rings in instruments.

At Ø25 mm the hole H6 measures 0 mm to +0.013 mm and the shaft k5 +0.002 mm to +0.011 mm, giving between 0.011 mm interference and 0.011 mm clearance.

How the limits are calculated

Hole H6: fundamental deviation EI = 0, standard tolerance IT6 = 13 µm for 18–30 mm. Shaft k5: fundamental deviation ei = 2 µm, IT5 = 9 µm. Clearance = hole − shaft, evaluated at both extremes. Values per ISO 286-1:2010.

H6/k5 limits by size range

Size (mm)	Hole H6	Shaft k5	Clearance min	Clearance max
≤ 3	+0.006 / 0	+0.004 / 0	−0.004	+0.006
3 – 6	+0.008 / 0	+0.006 / +0.001	−0.006	+0.007
6 – 10	+0.009 / 0	+0.007 / +0.001	−0.007	+0.008
10 – 18	+0.011 / 0	+0.009 / +0.001	−0.009	+0.010
18 – 30	+0.013 / 0	+0.011 / +0.002	−0.011	+0.011
30 – 50	+0.016 / 0	+0.013 / +0.002	−0.013	+0.014
50 – 80	+0.019 / 0	+0.015 / +0.002	−0.015	+0.017
80 – 120	+0.022 / 0	+0.018 / +0.003	−0.018	+0.019
120 – 180	+0.025 / 0	+0.021 / +0.003	−0.021	+0.022
180 – 250	+0.029 / 0	+0.024 / +0.004	−0.024	+0.025
250 – 315	+0.032 / 0	+0.027 / +0.004	−0.027	+0.028
315 – 400	+0.036 / 0	+0.029 / +0.004	−0.029	+0.032
400 – 500	+0.040 / 0	+0.032 / +0.005	−0.032	+0.035

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.