F7 tolerance (hole, IT7)
Hole tolerance class F7 per ISO 286-1:2010: fundamental deviation EI +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
- Hole
- Grade
- IT7
- Tolerance
- 10 … 63 µm
- Fund. deviation
- EI +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 | +16 | +6 | 3.016 | 3.006 | +0.016 | +0.006 | +0.00063 / +0.00024 |
| 3 – 6 | +22 | +10 | 6.022 | 6.010 | +0.022 | +0.010 | +0.00087 / +0.00039 |
| 6 – 10 | +28 | +13 | 10.028 | 10.013 | +0.028 | +0.013 | +0.00110 / +0.00051 |
| 10 – 14 | +34 | +16 | 14.034 | 14.016 | +0.034 | +0.016 | +0.00134 / +0.00063 |
| 14 – 18 | +34 | +16 | 18.034 | 18.016 | +0.034 | +0.016 | +0.00134 / +0.00063 |
| 18 – 24 | +41 | +20 | 24.041 | 24.020 | +0.041 | +0.020 | +0.00161 / +0.00079 |
| 24 – 30 | +41 | +20 | 30.041 | 30.020 | +0.041 | +0.020 | +0.00161 / +0.00079 |
| 30 – 40 | +50 | +25 | 40.050 | 40.025 | +0.050 | +0.025 | +0.00197 / +0.00098 |
| 40 – 50 | +50 | +25 | 50.050 | 50.025 | +0.050 | +0.025 | +0.00197 / +0.00098 |
| 50 – 65 | +60 | +30 | 65.060 | 65.030 | +0.060 | +0.030 | +0.00236 / +0.00118 |
| 65 – 80 | +60 | +30 | 80.060 | 80.030 | +0.060 | +0.030 | +0.00236 / +0.00118 |
| 80 – 100 | +71 | +36 | 100.071 | 100.036 | +0.071 | +0.036 | +0.00280 / +0.00142 |
| 100 – 120 | +71 | +36 | 120.071 | 120.036 | +0.071 | +0.036 | +0.00280 / +0.00142 |
| 120 – 140 | +83 | +43 | 140.083 | 140.043 | +0.083 | +0.043 | +0.00327 / +0.00169 |
| 140 – 160 | +83 | +43 | 160.083 | 160.043 | +0.083 | +0.043 | +0.00327 / +0.00169 |
| 160 – 180 | +83 | +43 | 180.083 | 180.043 | +0.083 | +0.043 | +0.00327 / +0.00169 |
| 180 – 200 | +96 | +50 | 200.096 | 200.050 | +0.096 | +0.050 | +0.00378 / +0.00197 |
| 200 – 225 | +96 | +50 | 225.096 | 225.050 | +0.096 | +0.050 | +0.00378 / +0.00197 |
| 225 – 250 | +96 | +50 | 250.096 | 250.050 | +0.096 | +0.050 | +0.00378 / +0.00197 |
| 250 – 280 | +108 | +56 | 280.108 | 280.056 | +0.108 | +0.056 | +0.00425 / +0.00220 |
| 280 – 315 | +108 | +56 | 315.108 | 315.056 | +0.108 | +0.056 | +0.00425 / +0.00220 |
| 315 – 355 | +119 | +62 | 355.119 | 355.062 | +0.119 | +0.062 | +0.00469 / +0.00244 |
| 355 – 400 | +119 | +62 | 400.119 | 400.062 | +0.119 | +0.062 | +0.00469 / +0.00244 |
| 400 – 450 | +131 | +68 | 450.131 | 450.068 | +0.131 | +0.068 | +0.00516 / +0.00268 |
| 450 – 500 | +131 | +68 | 500.131 | 500.068 | +0.131 | +0.068 | +0.00516 / +0.00268 |
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 hole tolerance zone with close running deviation in the ISO 286 system. It is used in F7/h6 (Shaft-basis equivalent of H7/f7.).
At Ø25 mm F7 is +0.041 / +0.020 mm, i.e. 25.020 to 25.041 mm.
How the limits are calculated
F7 uses grade IT7 (a standard tolerance of 21 µm at 18–30 mm). Fundamental deviation: EI = −es of the same shaft letter; IT7 sets the width above EI. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.