F6 tolerance (hole, IT6)
Hole tolerance class F6 per ISO 286-1:2010: fundamental deviation EI +6 … +68, grade IT6 (6 µm at ≤ 3 mm to 40 µm at 400–500 mm). For an exact size, open the calculator with F6 selected.
- Type
- Hole
- Grade
- IT6
- Tolerance
- 6 … 40 µm
- Fund. deviation
- EI +6 … +68 µm
F6 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | +12 | +6 | 3.012 | 3.006 | +0.012 | +0.006 | +0.00047 / +0.00024 |
| 3 – 6 | +18 | +10 | 6.018 | 6.010 | +0.018 | +0.010 | +0.00071 / +0.00039 |
| 6 – 10 | +22 | +13 | 10.022 | 10.013 | +0.022 | +0.013 | +0.00087 / +0.00051 |
| 10 – 14 | +27 | +16 | 14.027 | 14.016 | +0.027 | +0.016 | +0.00106 / +0.00063 |
| 14 – 18 | +27 | +16 | 18.027 | 18.016 | +0.027 | +0.016 | +0.00106 / +0.00063 |
| 18 – 24 | +33 | +20 | 24.033 | 24.020 | +0.033 | +0.020 | +0.00130 / +0.00079 |
| 24 – 30 | +33 | +20 | 30.033 | 30.020 | +0.033 | +0.020 | +0.00130 / +0.00079 |
| 30 – 40 | +41 | +25 | 40.041 | 40.025 | +0.041 | +0.025 | +0.00161 / +0.00098 |
| 40 – 50 | +41 | +25 | 50.041 | 50.025 | +0.041 | +0.025 | +0.00161 / +0.00098 |
| 50 – 65 | +49 | +30 | 65.049 | 65.030 | +0.049 | +0.030 | +0.00193 / +0.00118 |
| 65 – 80 | +49 | +30 | 80.049 | 80.030 | +0.049 | +0.030 | +0.00193 / +0.00118 |
| 80 – 100 | +58 | +36 | 100.058 | 100.036 | +0.058 | +0.036 | +0.00228 / +0.00142 |
| 100 – 120 | +58 | +36 | 120.058 | 120.036 | +0.058 | +0.036 | +0.00228 / +0.00142 |
| 120 – 140 | +68 | +43 | 140.068 | 140.043 | +0.068 | +0.043 | +0.00268 / +0.00169 |
| 140 – 160 | +68 | +43 | 160.068 | 160.043 | +0.068 | +0.043 | +0.00268 / +0.00169 |
| 160 – 180 | +68 | +43 | 180.068 | 180.043 | +0.068 | +0.043 | +0.00268 / +0.00169 |
| 180 – 200 | +79 | +50 | 200.079 | 200.050 | +0.079 | +0.050 | +0.00311 / +0.00197 |
| 200 – 225 | +79 | +50 | 225.079 | 225.050 | +0.079 | +0.050 | +0.00311 / +0.00197 |
| 225 – 250 | +79 | +50 | 250.079 | 250.050 | +0.079 | +0.050 | +0.00311 / +0.00197 |
| 250 – 280 | +88 | +56 | 280.088 | 280.056 | +0.088 | +0.056 | +0.00346 / +0.00220 |
| 280 – 315 | +88 | +56 | 315.088 | 315.056 | +0.088 | +0.056 | +0.00346 / +0.00220 |
| 315 – 355 | +98 | +62 | 355.098 | 355.062 | +0.098 | +0.062 | +0.00386 / +0.00244 |
| 355 – 400 | +98 | +62 | 400.098 | 400.062 | +0.098 | +0.062 | +0.00386 / +0.00244 |
| 400 – 450 | +108 | +68 | 450.108 | 450.068 | +0.108 | +0.068 | +0.00425 / +0.00268 |
| 450 – 500 | +108 | +68 | 500.108 | 500.068 | +0.108 | +0.068 | +0.00425 / +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 F6
F6 denotes a hole tolerance zone with close running deviation in the ISO 286 system.
At Ø25 mm F6 is +0.033 / +0.020 mm, i.e. 25.020 to 25.033 mm.
How the limits are calculated
F6 uses grade IT6 (a standard tolerance of 13 µm at 18–30 mm). Fundamental deviation: EI = −es of the same shaft letter; IT6 sets the width above EI. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.