f7 tolerance (shaft, IT7)
Shaft tolerance class f7 per ISO 286-1:2010: fundamental deviation es −6 … −68, grade IT7 (10 µm at ≤ 3 mm to 63 µm at 400–500 mm). For an exact size, open the calculator with f7 selected.
- Type
- Shaft
- Grade
- IT7
- Tolerance
- 10 … 63 µm
- Fund. deviation
- es −6 … −68 µm
f7 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | −6 | −16 | 2.994 | 2.984 | −0.006 | −0.016 | −0.00024 / −0.00063 |
| 3 – 6 | −10 | −22 | 5.990 | 5.978 | −0.010 | −0.022 | −0.00039 / −0.00087 |
| 6 – 10 | −13 | −28 | 9.987 | 9.972 | −0.013 | −0.028 | −0.00051 / −0.00110 |
| 10 – 14 | −16 | −34 | 13.984 | 13.966 | −0.016 | −0.034 | −0.00063 / −0.00134 |
| 14 – 18 | −16 | −34 | 17.984 | 17.966 | −0.016 | −0.034 | −0.00063 / −0.00134 |
| 18 – 24 | −20 | −41 | 23.980 | 23.959 | −0.020 | −0.041 | −0.00079 / −0.00161 |
| 24 – 30 | −20 | −41 | 29.980 | 29.959 | −0.020 | −0.041 | −0.00079 / −0.00161 |
| 30 – 40 | −25 | −50 | 39.975 | 39.950 | −0.025 | −0.050 | −0.00098 / −0.00197 |
| 40 – 50 | −25 | −50 | 49.975 | 49.950 | −0.025 | −0.050 | −0.00098 / −0.00197 |
| 50 – 65 | −30 | −60 | 64.970 | 64.940 | −0.030 | −0.060 | −0.00118 / −0.00236 |
| 65 – 80 | −30 | −60 | 79.970 | 79.940 | −0.030 | −0.060 | −0.00118 / −0.00236 |
| 80 – 100 | −36 | −71 | 99.964 | 99.929 | −0.036 | −0.071 | −0.00142 / −0.00280 |
| 100 – 120 | −36 | −71 | 119.964 | 119.929 | −0.036 | −0.071 | −0.00142 / −0.00280 |
| 120 – 140 | −43 | −83 | 139.957 | 139.917 | −0.043 | −0.083 | −0.00169 / −0.00327 |
| 140 – 160 | −43 | −83 | 159.957 | 159.917 | −0.043 | −0.083 | −0.00169 / −0.00327 |
| 160 – 180 | −43 | −83 | 179.957 | 179.917 | −0.043 | −0.083 | −0.00169 / −0.00327 |
| 180 – 200 | −50 | −96 | 199.950 | 199.904 | −0.050 | −0.096 | −0.00197 / −0.00378 |
| 200 – 225 | −50 | −96 | 224.950 | 224.904 | −0.050 | −0.096 | −0.00197 / −0.00378 |
| 225 – 250 | −50 | −96 | 249.950 | 249.904 | −0.050 | −0.096 | −0.00197 / −0.00378 |
| 250 – 280 | −56 | −108 | 279.944 | 279.892 | −0.056 | −0.108 | −0.00220 / −0.00425 |
| 280 – 315 | −56 | −108 | 314.944 | 314.892 | −0.056 | −0.108 | −0.00220 / −0.00425 |
| 315 – 355 | −62 | −119 | 354.938 | 354.881 | −0.062 | −0.119 | −0.00244 / −0.00469 |
| 355 – 400 | −62 | −119 | 399.938 | 399.881 | −0.062 | −0.119 | −0.00244 / −0.00469 |
| 400 – 450 | −68 | −131 | 449.932 | 449.869 | −0.068 | −0.131 | −0.00268 / −0.00516 |
| 450 – 500 | −68 | −131 | 499.932 | 499.869 | −0.068 | −0.131 | −0.00268 / −0.00516 |
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 f7
f7 denotes a shaft tolerance zone with close running deviation in the ISO 286 system. It is used in H8/f7 (Accurate machines and shafts in plain bearings at moderate speeds and pressures: machine tool spindles, gearbox shafts.) and H7/f7 (Sliding parts and journals at moderate speeds with noticeable but small play.).
At Ø25 mm f7 is −0.020 / −0.041 mm, i.e. 24.959 to 24.980 mm.
How the limits are calculated
f7 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.