f6 tolerance (shaft, IT6)
Shaft tolerance class f6 per ISO 286-1:2010: fundamental deviation es −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
- Shaft
- Grade
- IT6
- Tolerance
- 6 … 40 µm
- Fund. deviation
- es −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 | −6 | −12 | 2.994 | 2.988 | −0.006 | −0.012 | −0.00024 / −0.00047 |
| 3 – 6 | −10 | −18 | 5.990 | 5.982 | −0.010 | −0.018 | −0.00039 / −0.00071 |
| 6 – 10 | −13 | −22 | 9.987 | 9.978 | −0.013 | −0.022 | −0.00051 / −0.00087 |
| 10 – 14 | −16 | −27 | 13.984 | 13.973 | −0.016 | −0.027 | −0.00063 / −0.00106 |
| 14 – 18 | −16 | −27 | 17.984 | 17.973 | −0.016 | −0.027 | −0.00063 / −0.00106 |
| 18 – 24 | −20 | −33 | 23.980 | 23.967 | −0.020 | −0.033 | −0.00079 / −0.00130 |
| 24 – 30 | −20 | −33 | 29.980 | 29.967 | −0.020 | −0.033 | −0.00079 / −0.00130 |
| 30 – 40 | −25 | −41 | 39.975 | 39.959 | −0.025 | −0.041 | −0.00098 / −0.00161 |
| 40 – 50 | −25 | −41 | 49.975 | 49.959 | −0.025 | −0.041 | −0.00098 / −0.00161 |
| 50 – 65 | −30 | −49 | 64.970 | 64.951 | −0.030 | −0.049 | −0.00118 / −0.00193 |
| 65 – 80 | −30 | −49 | 79.970 | 79.951 | −0.030 | −0.049 | −0.00118 / −0.00193 |
| 80 – 100 | −36 | −58 | 99.964 | 99.942 | −0.036 | −0.058 | −0.00142 / −0.00228 |
| 100 – 120 | −36 | −58 | 119.964 | 119.942 | −0.036 | −0.058 | −0.00142 / −0.00228 |
| 120 – 140 | −43 | −68 | 139.957 | 139.932 | −0.043 | −0.068 | −0.00169 / −0.00268 |
| 140 – 160 | −43 | −68 | 159.957 | 159.932 | −0.043 | −0.068 | −0.00169 / −0.00268 |
| 160 – 180 | −43 | −68 | 179.957 | 179.932 | −0.043 | −0.068 | −0.00169 / −0.00268 |
| 180 – 200 | −50 | −79 | 199.950 | 199.921 | −0.050 | −0.079 | −0.00197 / −0.00311 |
| 200 – 225 | −50 | −79 | 224.950 | 224.921 | −0.050 | −0.079 | −0.00197 / −0.00311 |
| 225 – 250 | −50 | −79 | 249.950 | 249.921 | −0.050 | −0.079 | −0.00197 / −0.00311 |
| 250 – 280 | −56 | −88 | 279.944 | 279.912 | −0.056 | −0.088 | −0.00220 / −0.00346 |
| 280 – 315 | −56 | −88 | 314.944 | 314.912 | −0.056 | −0.088 | −0.00220 / −0.00346 |
| 315 – 355 | −62 | −98 | 354.938 | 354.902 | −0.062 | −0.098 | −0.00244 / −0.00386 |
| 355 – 400 | −62 | −98 | 399.938 | 399.902 | −0.062 | −0.098 | −0.00244 / −0.00386 |
| 400 – 450 | −68 | −108 | 449.932 | 449.892 | −0.068 | −0.108 | −0.00268 / −0.00425 |
| 450 – 500 | −68 | −108 | 499.932 | 499.892 | −0.068 | −0.108 | −0.00268 / −0.00425 |
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 shaft tolerance zone with close running deviation in the ISO 286 system. It is used in H7/f6 (Tighter running clearance than H7/f7 for precision-ground shafts in plain bearings: measuring-instrument spindles, small precision pumps, optical mechanisms.) and H6/f6 (High-precision running clearance for ground shafts in instrument and machine-tool plain bearings where H7/f7-class play is too loose: spindle bearings, precision slides.).
At Ø25 mm f6 is −0.020 / −0.033 mm, i.e. 24.967 to 24.980 mm.
How the limits are calculated
f6 uses grade IT6 (a standard tolerance of 13 µm at 18–30 mm). Fundamental deviation: es is tabulated directly by ISO 286-1 Table 2; ei = es − IT6. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.