A11 tolerance (hole, IT11)
Hole tolerance class A11 per ISO 286-1:2010: fundamental deviation EI +270 … +1650, grade IT11 (60 µm at ≤ 3 mm to 400 µm at 400–500 mm). For an exact size, open the calculator with A11 selected.
- Type
- Hole
- Grade
- IT11
- Tolerance
- 60 … 400 µm
- Fund. deviation
- EI +270 … +1650 µm
A11 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | +330 | +270 | 3.330 | 3.270 | +0.330 | +0.270 | +0.01299 / +0.01063 |
| 3 – 6 | +345 | +270 | 6.345 | 6.270 | +0.345 | +0.270 | +0.01358 / +0.01063 |
| 6 – 10 | +370 | +280 | 10.370 | 10.280 | +0.370 | +0.280 | +0.01457 / +0.01102 |
| 10 – 14 | +400 | +290 | 14.400 | 14.290 | +0.400 | +0.290 | +0.01575 / +0.01142 |
| 14 – 18 | +400 | +290 | 18.400 | 18.290 | +0.400 | +0.290 | +0.01575 / +0.01142 |
| 18 – 24 | +430 | +300 | 24.430 | 24.300 | +0.430 | +0.300 | +0.01693 / +0.01181 |
| 24 – 30 | +430 | +300 | 30.430 | 30.300 | +0.430 | +0.300 | +0.01693 / +0.01181 |
| 30 – 40 | +470 | +310 | 40.470 | 40.310 | +0.470 | +0.310 | +0.01850 / +0.01220 |
| 40 – 50 | +480 | +320 | 50.480 | 50.320 | +0.480 | +0.320 | +0.01890 / +0.01260 |
| 50 – 65 | +530 | +340 | 65.530 | 65.340 | +0.530 | +0.340 | +0.02087 / +0.01339 |
| 65 – 80 | +550 | +360 | 80.550 | 80.360 | +0.550 | +0.360 | +0.02165 / +0.01417 |
| 80 – 100 | +600 | +380 | 100.600 | 100.380 | +0.600 | +0.380 | +0.02362 / +0.01496 |
| 100 – 120 | +630 | +410 | 120.630 | 120.410 | +0.630 | +0.410 | +0.02480 / +0.01614 |
| 120 – 140 | +710 | +460 | 140.710 | 140.460 | +0.710 | +0.460 | +0.02795 / +0.01811 |
| 140 – 160 | +770 | +520 | 160.770 | 160.520 | +0.770 | +0.520 | +0.03031 / +0.02047 |
| 160 – 180 | +830 | +580 | 180.830 | 180.580 | +0.830 | +0.580 | +0.03268 / +0.02283 |
| 180 – 200 | +950 | +660 | 200.950 | 200.660 | +0.950 | +0.660 | +0.03740 / +0.02598 |
| 200 – 225 | +1030 | +740 | 226.030 | 225.740 | +1.030 | +0.740 | +0.04055 / +0.02913 |
| 225 – 250 | +1110 | +820 | 251.110 | 250.820 | +1.110 | +0.820 | +0.04370 / +0.03228 |
| 250 – 280 | +1240 | +920 | 281.240 | 280.920 | +1.240 | +0.920 | +0.04882 / +0.03622 |
| 280 – 315 | +1370 | +1050 | 316.370 | 316.050 | +1.370 | +1.050 | +0.05394 / +0.04134 |
| 315 – 355 | +1560 | +1200 | 356.560 | 356.200 | +1.560 | +1.200 | +0.06142 / +0.04724 |
| 355 – 400 | +1710 | +1350 | 401.710 | 401.350 | +1.710 | +1.350 | +0.06732 / +0.05315 |
| 400 – 450 | +1900 | +1500 | 451.900 | 451.500 | +1.900 | +1.500 | +0.07480 / +0.05906 |
| 450 – 500 | +2050 | +1650 | 502.050 | 501.650 | +2.050 | +1.650 | +0.08071 / +0.06496 |
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 A11
A11 denotes a hole tolerance zone with large clearance deviation in the ISO 286 system. It is used in A11/h11 (Shaft-basis equivalent of H11/a11.).
At Ø25 mm A11 is +0.430 / +0.300 mm, i.e. 25.300 to 25.430 mm.
How the limits are calculated
A11 uses grade IT11 (a standard tolerance of 130 µm at 18–30 mm). Fundamental deviation: EI = −es of the same shaft letter; IT11 sets the width above EI. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.