K7/h6 fit — Locational transition (shaft basis)

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

Nominal size

Unit

Result

Ø25.000 K7/h6Transition fit

	Upper	Lower	Max	Min	Tol.
Hole K7	+0.006	−0.015	25.006	24.985	0.021
Shaft h6	0	−0.013	25.000	24.987	0.013

Max clearance: 0.019 mm
Max interference: 0.015 mm
Mean: +0.002 mm

Fit diagram (µm · zero line = nominal)

Hole tolerance zoneShaft tolerance zoneClearanceInterference

About K7/h6

Shaft-basis equivalent of H7/k6, e.g. ball-bearing outer rings in housings.

At Ø25 mm the hole K7 measures −0.015 mm to +0.006 mm and the shaft h6 −0.013 mm to 0 mm, giving between 0.015 mm interference and 0.019 mm clearance.

How the limits are calculated

Hole K7: 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.

K7/h6 limits by size range

Size (mm)	Hole K7	Shaft h6	Clearance min	Clearance max
≤ 3	0 / −0.010	0 / −0.006	−0.010	+0.006
3 – 6	+0.003 / −0.009	0 / −0.008	−0.009	+0.011
6 – 10	+0.005 / −0.010	0 / −0.009	−0.010	+0.014
10 – 18	+0.006 / −0.012	0 / −0.011	−0.012	+0.017
18 – 30	+0.006 / −0.015	0 / −0.013	−0.015	+0.019
30 – 50	+0.007 / −0.018	0 / −0.016	−0.018	+0.023
50 – 80	+0.009 / −0.021	0 / −0.019	−0.021	+0.028
80 – 120	+0.010 / −0.025	0 / −0.022	−0.025	+0.032
120 – 180	+0.012 / −0.028	0 / −0.025	−0.028	+0.037
180 – 250	+0.013 / −0.033	0 / −0.029	−0.033	+0.042
250 – 315	+0.016 / −0.036	0 / −0.032	−0.036	+0.048
315 – 400	+0.017 / −0.040	0 / −0.036	−0.040	+0.053
400 – 500	+0.018 / −0.045	0 / −0.040	−0.045	+0.058

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.