H11 tolerance (hole, IT11)
Hole tolerance class H11 per ISO 286-1:2010: fundamental deviation EI = 0, grade IT11 (60 µm at ≤ 3 mm to 400 µm at 400–500 mm). For an exact size, open the calculator with H11 selected.
- Type
- Hole
- Grade
- IT11
- Tolerance
- 60 … 400 µm
- Fund. deviation
- EI = 0
H11 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | +60 | 0 | 3.060 | 3.000 | +0.060 | 0 | +0.00236 / 0 |
| 3 – 6 | +75 | 0 | 6.075 | 6.000 | +0.075 | 0 | +0.00295 / 0 |
| 6 – 10 | +90 | 0 | 10.090 | 10.000 | +0.090 | 0 | +0.00354 / 0 |
| 10 – 14 | +110 | 0 | 14.110 | 14.000 | +0.110 | 0 | +0.00433 / 0 |
| 14 – 18 | +110 | 0 | 18.110 | 18.000 | +0.110 | 0 | +0.00433 / 0 |
| 18 – 24 | +130 | 0 | 24.130 | 24.000 | +0.130 | 0 | +0.00512 / 0 |
| 24 – 30 | +130 | 0 | 30.130 | 30.000 | +0.130 | 0 | +0.00512 / 0 |
| 30 – 40 | +160 | 0 | 40.160 | 40.000 | +0.160 | 0 | +0.00630 / 0 |
| 40 – 50 | +160 | 0 | 50.160 | 50.000 | +0.160 | 0 | +0.00630 / 0 |
| 50 – 65 | +190 | 0 | 65.190 | 65.000 | +0.190 | 0 | +0.00748 / 0 |
| 65 – 80 | +190 | 0 | 80.190 | 80.000 | +0.190 | 0 | +0.00748 / 0 |
| 80 – 100 | +220 | 0 | 100.220 | 100.000 | +0.220 | 0 | +0.00866 / 0 |
| 100 – 120 | +220 | 0 | 120.220 | 120.000 | +0.220 | 0 | +0.00866 / 0 |
| 120 – 140 | +250 | 0 | 140.250 | 140.000 | +0.250 | 0 | +0.00984 / 0 |
| 140 – 160 | +250 | 0 | 160.250 | 160.000 | +0.250 | 0 | +0.00984 / 0 |
| 160 – 180 | +250 | 0 | 180.250 | 180.000 | +0.250 | 0 | +0.00984 / 0 |
| 180 – 200 | +290 | 0 | 200.290 | 200.000 | +0.290 | 0 | +0.01142 / 0 |
| 200 – 225 | +290 | 0 | 225.290 | 225.000 | +0.290 | 0 | +0.01142 / 0 |
| 225 – 250 | +290 | 0 | 250.290 | 250.000 | +0.290 | 0 | +0.01142 / 0 |
| 250 – 280 | +320 | 0 | 280.320 | 280.000 | +0.320 | 0 | +0.01260 / 0 |
| 280 – 315 | +320 | 0 | 315.320 | 315.000 | +0.320 | 0 | +0.01260 / 0 |
| 315 – 355 | +360 | 0 | 355.360 | 355.000 | +0.360 | 0 | +0.01417 / 0 |
| 355 – 400 | +360 | 0 | 400.360 | 400.000 | +0.360 | 0 | +0.01417 / 0 |
| 400 – 450 | +400 | 0 | 450.400 | 450.000 | +0.400 | 0 | +0.01575 / 0 |
| 450 – 500 | +400 | 0 | 500.400 | 500.000 | +0.400 | 0 | +0.01575 / 0 |
Deviations at the upper end of each range (Ø columns use that size); use the calculator for the exact size. — : not defined by ISO 286 for that size. Upper/Lower (mm) and inch columns are shown on wider screens.
About H11
H11 denotes a hole tolerance zone with zero line deviation in the ISO 286 system. It is used in H11/c11 (Large clearance for parts that must assemble easily despite dirt, heat or poor alignment: agricultural machinery, brake linkages, loose pulleys.) and H11/a11 (Maximum clearance in the standard series; used where parts run hot or where accuracy is irrelevant.).
At Ø25 mm H11 is +0.130 / 0 mm, i.e. 25.000 to 25.130 mm.
How the limits are calculated
H11 uses grade IT11 (a standard tolerance of 130 µm at 18–30 mm). Fundamental deviation: EI = 0: the tolerance zone sits entirely above the nominal size, and IT11 sets its width. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.