e7 tolerance (shaft, IT7)
Shaft tolerance class e7 per ISO 286-1:2010: fundamental deviation es −14 … −135, grade IT7 (10 µm at ≤ 3 mm to 63 µm at 400–500 mm). For an exact size, open the calculator with e7 selected.
- Type
- Shaft
- Grade
- IT7
- Tolerance
- 10 … 63 µm
- Fund. deviation
- es −14 … −135 µm
e7 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | −14 | −24 | 2.986 | 2.976 | −0.014 | −0.024 | −0.00055 / −0.00094 |
| 3 – 6 | −20 | −32 | 5.980 | 5.968 | −0.020 | −0.032 | −0.00079 / −0.00126 |
| 6 – 10 | −25 | −40 | 9.975 | 9.960 | −0.025 | −0.040 | −0.00098 / −0.00157 |
| 10 – 14 | −32 | −50 | 13.968 | 13.950 | −0.032 | −0.050 | −0.00126 / −0.00197 |
| 14 – 18 | −32 | −50 | 17.968 | 17.950 | −0.032 | −0.050 | −0.00126 / −0.00197 |
| 18 – 24 | −40 | −61 | 23.960 | 23.939 | −0.040 | −0.061 | −0.00157 / −0.00240 |
| 24 – 30 | −40 | −61 | 29.960 | 29.939 | −0.040 | −0.061 | −0.00157 / −0.00240 |
| 30 – 40 | −50 | −75 | 39.950 | 39.925 | −0.050 | −0.075 | −0.00197 / −0.00295 |
| 40 – 50 | −50 | −75 | 49.950 | 49.925 | −0.050 | −0.075 | −0.00197 / −0.00295 |
| 50 – 65 | −60 | −90 | 64.940 | 64.910 | −0.060 | −0.090 | −0.00236 / −0.00354 |
| 65 – 80 | −60 | −90 | 79.940 | 79.910 | −0.060 | −0.090 | −0.00236 / −0.00354 |
| 80 – 100 | −72 | −107 | 99.928 | 99.893 | −0.072 | −0.107 | −0.00283 / −0.00421 |
| 100 – 120 | −72 | −107 | 119.928 | 119.893 | −0.072 | −0.107 | −0.00283 / −0.00421 |
| 120 – 140 | −85 | −125 | 139.915 | 139.875 | −0.085 | −0.125 | −0.00335 / −0.00492 |
| 140 – 160 | −85 | −125 | 159.915 | 159.875 | −0.085 | −0.125 | −0.00335 / −0.00492 |
| 160 – 180 | −85 | −125 | 179.915 | 179.875 | −0.085 | −0.125 | −0.00335 / −0.00492 |
| 180 – 200 | −100 | −146 | 199.900 | 199.854 | −0.100 | −0.146 | −0.00394 / −0.00575 |
| 200 – 225 | −100 | −146 | 224.900 | 224.854 | −0.100 | −0.146 | −0.00394 / −0.00575 |
| 225 – 250 | −100 | −146 | 249.900 | 249.854 | −0.100 | −0.146 | −0.00394 / −0.00575 |
| 250 – 280 | −110 | −162 | 279.890 | 279.838 | −0.110 | −0.162 | −0.00433 / −0.00638 |
| 280 – 315 | −110 | −162 | 314.890 | 314.838 | −0.110 | −0.162 | −0.00433 / −0.00638 |
| 315 – 355 | −125 | −182 | 354.875 | 354.818 | −0.125 | −0.182 | −0.00492 / −0.00717 |
| 355 – 400 | −125 | −182 | 399.875 | 399.818 | −0.125 | −0.182 | −0.00492 / −0.00717 |
| 400 – 450 | −135 | −198 | 449.865 | 449.802 | −0.135 | −0.198 | −0.00531 / −0.00780 |
| 450 – 500 | −135 | −198 | 499.865 | 499.802 | −0.135 | −0.198 | −0.00531 / −0.00780 |
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 e7
e7 denotes a shaft tolerance zone with running clearance deviation in the ISO 286 system. It is used in H7/e7 (Generous running clearance for plain bearings on shafts turning at moderate-to-high speed with average lubrication: pump and fan shafts, multi-bearing line shafting.).
At Ø25 mm e7 is −0.040 / −0.061 mm, i.e. 24.939 to 24.960 mm.
How the limits are calculated
e7 uses grade IT7 (a standard tolerance of 21 µm at 18–30 mm). Fundamental deviation: es is tabulated directly by ISO 286-1 Table 2; ei = es − IT7. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.