D9 tolerance (hole, IT9)
Hole tolerance class D9 per ISO 286-1:2010: fundamental deviation EI +20 … +230, grade IT9 (25 µm at ≤ 3 mm to 155 µm at 400–500 mm). For an exact size, open the calculator with D9 selected.
- Type
- Hole
- Grade
- IT9
- Tolerance
- 25 … 155 µm
- Fund. deviation
- EI +20 … +230 µm
D9 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | +45 | +20 | 3.045 | 3.020 | +0.045 | +0.020 | +0.00177 / +0.00079 |
| 3 – 6 | +60 | +30 | 6.060 | 6.030 | +0.060 | +0.030 | +0.00236 / +0.00118 |
| 6 – 10 | +76 | +40 | 10.076 | 10.040 | +0.076 | +0.040 | +0.00299 / +0.00157 |
| 10 – 14 | +93 | +50 | 14.093 | 14.050 | +0.093 | +0.050 | +0.00366 / +0.00197 |
| 14 – 18 | +93 | +50 | 18.093 | 18.050 | +0.093 | +0.050 | +0.00366 / +0.00197 |
| 18 – 24 | +117 | +65 | 24.117 | 24.065 | +0.117 | +0.065 | +0.00461 / +0.00256 |
| 24 – 30 | +117 | +65 | 30.117 | 30.065 | +0.117 | +0.065 | +0.00461 / +0.00256 |
| 30 – 40 | +142 | +80 | 40.142 | 40.080 | +0.142 | +0.080 | +0.00559 / +0.00315 |
| 40 – 50 | +142 | +80 | 50.142 | 50.080 | +0.142 | +0.080 | +0.00559 / +0.00315 |
| 50 – 65 | +174 | +100 | 65.174 | 65.100 | +0.174 | +0.100 | +0.00685 / +0.00394 |
| 65 – 80 | +174 | +100 | 80.174 | 80.100 | +0.174 | +0.100 | +0.00685 / +0.00394 |
| 80 – 100 | +207 | +120 | 100.207 | 100.120 | +0.207 | +0.120 | +0.00815 / +0.00472 |
| 100 – 120 | +207 | +120 | 120.207 | 120.120 | +0.207 | +0.120 | +0.00815 / +0.00472 |
| 120 – 140 | +245 | +145 | 140.245 | 140.145 | +0.245 | +0.145 | +0.00965 / +0.00571 |
| 140 – 160 | +245 | +145 | 160.245 | 160.145 | +0.245 | +0.145 | +0.00965 / +0.00571 |
| 160 – 180 | +245 | +145 | 180.245 | 180.145 | +0.245 | +0.145 | +0.00965 / +0.00571 |
| 180 – 200 | +285 | +170 | 200.285 | 200.170 | +0.285 | +0.170 | +0.01122 / +0.00669 |
| 200 – 225 | +285 | +170 | 225.285 | 225.170 | +0.285 | +0.170 | +0.01122 / +0.00669 |
| 225 – 250 | +285 | +170 | 250.285 | 250.170 | +0.285 | +0.170 | +0.01122 / +0.00669 |
| 250 – 280 | +320 | +190 | 280.320 | 280.190 | +0.320 | +0.190 | +0.01260 / +0.00748 |
| 280 – 315 | +320 | +190 | 315.320 | 315.190 | +0.320 | +0.190 | +0.01260 / +0.00748 |
| 315 – 355 | +350 | +210 | 355.350 | 355.210 | +0.350 | +0.210 | +0.01378 / +0.00827 |
| 355 – 400 | +350 | +210 | 400.350 | 400.210 | +0.350 | +0.210 | +0.01378 / +0.00827 |
| 400 – 450 | +385 | +230 | 450.385 | 450.230 | +0.385 | +0.230 | +0.01516 / +0.00906 |
| 450 – 500 | +385 | +230 | 500.385 | 500.230 | +0.385 | +0.230 | +0.01516 / +0.00906 |
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 D9
D9 denotes a hole tolerance zone with running clearance deviation in the ISO 286 system. It is used in D9/h9 (Shaft-basis equivalent of H9/d9, used when several parts with different fits sit on one plain shaft.).
At Ø25 mm D9 is +0.117 / +0.065 mm, i.e. 25.065 to 25.117 mm.
How the limits are calculated
D9 uses grade IT9 (a standard tolerance of 52 µm at 18–30 mm). Fundamental deviation: EI = −es of the same shaft letter; IT9 sets the width above EI. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.