R7/h6 fit — Medium drive fit (shaft basis)

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

Nominal size

Unit

Result

Ø25.000 R7/h6Interference fit

	Upper	Lower	Max	Min	Tol.
Hole R7	−0.020	−0.041	24.980	24.959	0.021
Shaft h6	0	−0.013	25.000	24.987	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 R7/h6

Shaft-basis equivalent of H7/r6.

At Ø25 mm the hole R7 measures −0.041 mm to −0.020 mm and the shaft h6 −0.013 mm to 0 mm, giving an interference of 0.007 mm to 0.041 mm.

How the limits are calculated

Hole R7: 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.

R7/h6 limits by size range

Size (mm)	Hole R7	Shaft h6	Clearance min	Clearance max
≤ 3	−0.010 / −0.020	0 / −0.006	−0.020	−0.004
3 – 6	−0.011 / −0.023	0 / −0.008	−0.023	−0.003
6 – 10	−0.013 / −0.028	0 / −0.009	−0.028	−0.004
10 – 18	−0.016 / −0.034	0 / −0.011	−0.034	−0.005
18 – 30	−0.020 / −0.041	0 / −0.013	−0.041	−0.007
30 – 50	−0.025 / −0.050	0 / −0.016	−0.050	−0.009
50 – 80	−0.032 / −0.062	0 / −0.019	−0.062	−0.013
80 – 120	−0.041 / −0.076	0 / −0.022	−0.076	−0.019
120 – 180	−0.053 / −0.093	0 / −0.025	−0.093	−0.028
180 – 250	−0.067 / −0.113	0 / −0.029	−0.113	−0.038
250 – 315	−0.078 / −0.130	0 / −0.032	−0.130	−0.046
315 – 400	−0.093 / −0.150	0 / −0.036	−0.150	−0.057
400 – 500	−0.109 / −0.172	0 / −0.040	−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.