d9 tolerance (shaft, IT9)
Shaft tolerance class d9 per ISO 286-1:2010: fundamental deviation es −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
- Shaft
- Grade
- IT9
- Tolerance
- 25 … 155 µm
- Fund. deviation
- es −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 | −20 | −45 | 2.980 | 2.955 | −0.020 | −0.045 | −0.00079 / −0.00177 |
| 3 – 6 | −30 | −60 | 5.970 | 5.940 | −0.030 | −0.060 | −0.00118 / −0.00236 |
| 6 – 10 | −40 | −76 | 9.960 | 9.924 | −0.040 | −0.076 | −0.00157 / −0.00299 |
| 10 – 14 | −50 | −93 | 13.950 | 13.907 | −0.050 | −0.093 | −0.00197 / −0.00366 |
| 14 – 18 | −50 | −93 | 17.950 | 17.907 | −0.050 | −0.093 | −0.00197 / −0.00366 |
| 18 – 24 | −65 | −117 | 23.935 | 23.883 | −0.065 | −0.117 | −0.00256 / −0.00461 |
| 24 – 30 | −65 | −117 | 29.935 | 29.883 | −0.065 | −0.117 | −0.00256 / −0.00461 |
| 30 – 40 | −80 | −142 | 39.920 | 39.858 | −0.080 | −0.142 | −0.00315 / −0.00559 |
| 40 – 50 | −80 | −142 | 49.920 | 49.858 | −0.080 | −0.142 | −0.00315 / −0.00559 |
| 50 – 65 | −100 | −174 | 64.900 | 64.826 | −0.100 | −0.174 | −0.00394 / −0.00685 |
| 65 – 80 | −100 | −174 | 79.900 | 79.826 | −0.100 | −0.174 | −0.00394 / −0.00685 |
| 80 – 100 | −120 | −207 | 99.880 | 99.793 | −0.120 | −0.207 | −0.00472 / −0.00815 |
| 100 – 120 | −120 | −207 | 119.880 | 119.793 | −0.120 | −0.207 | −0.00472 / −0.00815 |
| 120 – 140 | −145 | −245 | 139.855 | 139.755 | −0.145 | −0.245 | −0.00571 / −0.00965 |
| 140 – 160 | −145 | −245 | 159.855 | 159.755 | −0.145 | −0.245 | −0.00571 / −0.00965 |
| 160 – 180 | −145 | −245 | 179.855 | 179.755 | −0.145 | −0.245 | −0.00571 / −0.00965 |
| 180 – 200 | −170 | −285 | 199.830 | 199.715 | −0.170 | −0.285 | −0.00669 / −0.01122 |
| 200 – 225 | −170 | −285 | 224.830 | 224.715 | −0.170 | −0.285 | −0.00669 / −0.01122 |
| 225 – 250 | −170 | −285 | 249.830 | 249.715 | −0.170 | −0.285 | −0.00669 / −0.01122 |
| 250 – 280 | −190 | −320 | 279.810 | 279.680 | −0.190 | −0.320 | −0.00748 / −0.01260 |
| 280 – 315 | −190 | −320 | 314.810 | 314.680 | −0.190 | −0.320 | −0.00748 / −0.01260 |
| 315 – 355 | −210 | −350 | 354.790 | 354.650 | −0.210 | −0.350 | −0.00827 / −0.01378 |
| 355 – 400 | −210 | −350 | 399.790 | 399.650 | −0.210 | −0.350 | −0.00827 / −0.01378 |
| 400 – 450 | −230 | −385 | 449.770 | 449.615 | −0.230 | −0.385 | −0.00906 / −0.01516 |
| 450 – 500 | −230 | −385 | 499.770 | 499.615 | −0.230 | −0.385 | −0.00906 / −0.01516 |
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 shaft tolerance zone with running clearance deviation in the ISO 286 system. It is used in H9/d9 (Shafts running in plain bearings with wide temperature variation, high speed or heavy journal pressure.) and H8/d9 (Wide clearance on an IT8/IT9 pair for rough-service shafts and bushings where easy running matters more than alignment or finish: agricultural and construction equipment.).
At Ø25 mm d9 is −0.065 / −0.117 mm, i.e. 24.883 to 24.935 mm.
How the limits are calculated
d9 uses grade IT9 (a standard tolerance of 52 µm at 18–30 mm). Fundamental deviation: es is tabulated directly by ISO 286-1 Table 2; ei = es − IT9. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.