C11 tolerance (hole, IT11)
Hole tolerance class C11 per ISO 286-1:2010: fundamental deviation EI +60 … +480, grade IT11 (60 µm at ≤ 3 mm to 400 µm at 400–500 mm). For an exact size, open the calculator with C11 selected.
- Type
- Hole
- Grade
- IT11
- Tolerance
- 60 … 400 µm
- Fund. deviation
- EI +60 … +480 µm
C11 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | +120 | +60 | 3.120 | 3.060 | +0.120 | +0.060 | +0.00472 / +0.00236 |
| 3 – 6 | +145 | +70 | 6.145 | 6.070 | +0.145 | +0.070 | +0.00571 / +0.00276 |
| 6 – 10 | +170 | +80 | 10.170 | 10.080 | +0.170 | +0.080 | +0.00669 / +0.00315 |
| 10 – 14 | +205 | +95 | 14.205 | 14.095 | +0.205 | +0.095 | +0.00807 / +0.00374 |
| 14 – 18 | +205 | +95 | 18.205 | 18.095 | +0.205 | +0.095 | +0.00807 / +0.00374 |
| 18 – 24 | +240 | +110 | 24.240 | 24.110 | +0.240 | +0.110 | +0.00945 / +0.00433 |
| 24 – 30 | +240 | +110 | 30.240 | 30.110 | +0.240 | +0.110 | +0.00945 / +0.00433 |
| 30 – 40 | +280 | +120 | 40.280 | 40.120 | +0.280 | +0.120 | +0.01102 / +0.00472 |
| 40 – 50 | +290 | +130 | 50.290 | 50.130 | +0.290 | +0.130 | +0.01142 / +0.00512 |
| 50 – 65 | +330 | +140 | 65.330 | 65.140 | +0.330 | +0.140 | +0.01299 / +0.00551 |
| 65 – 80 | +340 | +150 | 80.340 | 80.150 | +0.340 | +0.150 | +0.01339 / +0.00591 |
| 80 – 100 | +390 | +170 | 100.390 | 100.170 | +0.390 | +0.170 | +0.01535 / +0.00669 |
| 100 – 120 | +400 | +180 | 120.400 | 120.180 | +0.400 | +0.180 | +0.01575 / +0.00709 |
| 120 – 140 | +450 | +200 | 140.450 | 140.200 | +0.450 | +0.200 | +0.01772 / +0.00787 |
| 140 – 160 | +460 | +210 | 160.460 | 160.210 | +0.460 | +0.210 | +0.01811 / +0.00827 |
| 160 – 180 | +480 | +230 | 180.480 | 180.230 | +0.480 | +0.230 | +0.01890 / +0.00906 |
| 180 – 200 | +530 | +240 | 200.530 | 200.240 | +0.530 | +0.240 | +0.02087 / +0.00945 |
| 200 – 225 | +550 | +260 | 225.550 | 225.260 | +0.550 | +0.260 | +0.02165 / +0.01024 |
| 225 – 250 | +570 | +280 | 250.570 | 250.280 | +0.570 | +0.280 | +0.02244 / +0.01102 |
| 250 – 280 | +620 | +300 | 280.620 | 280.300 | +0.620 | +0.300 | +0.02441 / +0.01181 |
| 280 – 315 | +650 | +330 | 315.650 | 315.330 | +0.650 | +0.330 | +0.02559 / +0.01299 |
| 315 – 355 | +720 | +360 | 355.720 | 355.360 | +0.720 | +0.360 | +0.02835 / +0.01417 |
| 355 – 400 | +760 | +400 | 400.760 | 400.400 | +0.760 | +0.400 | +0.02992 / +0.01575 |
| 400 – 450 | +840 | +440 | 450.840 | 450.440 | +0.840 | +0.440 | +0.03307 / +0.01732 |
| 450 – 500 | +880 | +480 | 500.880 | 500.480 | +0.880 | +0.480 | +0.03465 / +0.01890 |
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 C11
C11 denotes a hole tolerance zone with large clearance deviation in the ISO 286 system. It is used in C11/h11 (Shaft-basis equivalent of H11/c11 for plain drawn shafting.).
At Ø25 mm C11 is +0.240 / +0.110 mm, i.e. 25.110 to 25.240 mm.
How the limits are calculated
C11 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.