H7/js6 fit — Locational transition

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

Nominal size

Unit

Result

Ø25.000 H7/js6Transition fit

	Upper	Lower	Max	Min	Tol.
Hole H7	+0.021	0	25.021	25.000	0.021
Shaft js6	+0.0065	−0.0065	25.0065	24.9935	0.013

Max clearance: 0.0275 mm
Max interference: 0.0065 mm
Mean: +0.0105 mm

Fit diagram (µm · zero line = nominal)

Hole tolerance zoneShaft tolerance zoneClearanceInterference

About H7/js6

Parts that need accurate location and easy assembly with a light hammer: pulleys, hand-wheels, couplings.

At Ø25 mm the hole H7 measures 0 mm to +0.021 mm and the shaft js6 −0.0065 mm to +0.0065 mm, giving between 0.0065 mm interference and 0.0275 mm clearance.

How the limits are calculated

Hole H7: fundamental deviation EI = 0, standard tolerance IT7 = 21 µm for 18–30 mm. Shaft js6: fundamental deviation ei = -6.5 µm, IT6 = 13 µm. Clearance = hole − shaft, evaluated at both extremes. Values per ISO 286-1:2010.

H7/js6 limits by size range

Size (mm)	Hole H7	Shaft js6	Clearance min	Clearance max
≤ 3	+0.010 / 0	+0.003 / −0.003	−0.003	+0.013
3 – 6	+0.012 / 0	+0.004 / −0.004	−0.004	+0.016
6 – 10	+0.015 / 0	+0.0045 / −0.0045	−0.0045	+0.0195
10 – 18	+0.018 / 0	+0.0055 / −0.0055	−0.0055	+0.0235
18 – 30	+0.021 / 0	+0.0065 / −0.0065	−0.0065	+0.0275
30 – 50	+0.025 / 0	+0.008 / −0.008	−0.008	+0.033
50 – 80	+0.030 / 0	+0.0095 / −0.0095	−0.0095	+0.0395
80 – 120	+0.035 / 0	+0.011 / −0.011	−0.011	+0.046
120 – 180	+0.040 / 0	+0.0125 / −0.0125	−0.0125	+0.0525
180 – 250	+0.046 / 0	+0.0145 / −0.0145	−0.0145	+0.0605
250 – 315	+0.052 / 0	+0.016 / −0.016	−0.016	+0.068
315 – 400	+0.057 / 0	+0.018 / −0.018	−0.018	+0.075
400 – 500	+0.063 / 0	+0.020 / −0.020	−0.020	+0.083

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.