H7/g6 fit — Close running / sliding fit

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

Nominal size

Unit

Result

Ø25.000 H7/g6Clearance fit

	Upper	Lower	Max	Min	Tol.
Hole H7	+0.021	0	25.021	25.000	0.021
Shaft g6	−0.007	−0.020	24.993	24.980	0.013

Max clearance: 0.041 mm
Min clearance: 0.007 mm
Mean: +0.024 mm

Fit diagram (µm · zero line = nominal)

Hole tolerance zoneShaft tolerance zoneClearance

About H7/g6

Precision sliding parts that must move without perceptible play: spindles, sliding gears, guide pins, plungers.

At Ø25 mm the hole H7 measures 0 mm to +0.021 mm and the shaft g6 −0.020 mm to −0.007 mm, giving a clearance 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 g6: fundamental deviation es = -7 µm, IT6 = 13 µm. Clearance = hole − shaft, evaluated at both extremes. Values per ISO 286-1:2010.

H7/g6 limits by size range

Size (mm)	Hole H7	Shaft g6	Clearance min	Clearance max
≤ 3	+0.010 / 0	−0.002 / −0.008	+0.002	+0.018
3 – 6	+0.012 / 0	−0.004 / −0.012	+0.004	+0.024
6 – 10	+0.015 / 0	−0.005 / −0.014	+0.005	+0.029
10 – 18	+0.018 / 0	−0.006 / −0.017	+0.006	+0.035
18 – 30	+0.021 / 0	−0.007 / −0.020	+0.007	+0.041
30 – 50	+0.025 / 0	−0.009 / −0.025	+0.009	+0.050
50 – 80	+0.030 / 0	−0.010 / −0.029	+0.010	+0.059
80 – 120	+0.035 / 0	−0.012 / −0.034	+0.012	+0.069
120 – 180	+0.040 / 0	−0.014 / −0.039	+0.014	+0.079
180 – 250	+0.046 / 0	−0.015 / −0.044	+0.015	+0.090
250 – 315	+0.052 / 0	−0.017 / −0.049	+0.017	+0.101
315 – 400	+0.057 / 0	−0.018 / −0.054	+0.018	+0.111
400 – 500	+0.063 / 0	−0.020 / −0.060	+0.020	+0.123

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.