H7/r6 fit — Medium drive fit

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

Nominal size

Unit

Result

Ø25.000 H7/r6Interference fit

	Upper	Lower	Max	Min	Tol.
Hole H7	+0.021	0	25.021	25.000	0.021
Shaft r6	+0.041	+0.028	25.041	25.028	0.013

Max interference: 0.041 mm
Min interference: 0.007 mm
Mean: −0.024 mm

Fit diagram (µm · zero line = nominal)

Hole tolerance zoneShaft tolerance zoneInterference

About H7/r6

Press fit transmitting moderate torque; can be dismantled with a press, e.g. bushes, gear rims, shaft collars.

At Ø25 mm the hole H7 measures 0 mm to +0.021 mm and the shaft r6 +0.028 mm to +0.041 mm, giving an interference of 0.007 mm to 0.041 mm.

How the limits are calculated

Hole H7: fundamental deviation EI = 0, standard tolerance IT7 = 21 µm for 18–30 mm. Shaft r6: fundamental deviation ei = 28 µm, IT6 = 13 µm. Clearance = hole − shaft, evaluated at both extremes. Values per ISO 286-1:2010.

H7/r6 limits by size range

Size (mm)	Hole H7	Shaft r6	Clearance min	Clearance max
≤ 3	+0.010 / 0	+0.016 / +0.010	−0.016	0
3 – 6	+0.012 / 0	+0.023 / +0.015	−0.023	−0.003
6 – 10	+0.015 / 0	+0.028 / +0.019	−0.028	−0.004
10 – 18	+0.018 / 0	+0.034 / +0.023	−0.034	−0.005
18 – 30	+0.021 / 0	+0.041 / +0.028	−0.041	−0.007
30 – 50	+0.025 / 0	+0.050 / +0.034	−0.050	−0.009
50 – 80	+0.030 / 0	+0.062 / +0.043	−0.062	−0.013
80 – 120	+0.035 / 0	+0.076 / +0.054	−0.076	−0.019
120 – 180	+0.040 / 0	+0.093 / +0.068	−0.093	−0.028
180 – 250	+0.046 / 0	+0.113 / +0.084	−0.113	−0.038
250 – 315	+0.052 / 0	+0.130 / +0.098	−0.130	−0.046
315 – 400	+0.057 / 0	+0.150 / +0.114	−0.150	−0.057
400 – 500	+0.063 / 0	+0.172 / +0.132	−0.172	−0.069

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.