k7 tolerance (shaft, IT7)
Shaft tolerance class k7 per ISO 286-1:2010: fundamental deviation ei 0 … +5, grade IT7 (10 µm at ≤ 3 mm to 63 µm at 400–500 mm). For an exact size, open the calculator with k7 selected.
- Type
- Shaft
- Grade
- IT7
- Tolerance
- 10 … 63 µm
- Fund. deviation
- ei 0 … +5 µm
k7 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | +10 | 0 | 3.010 | 3.000 | +0.010 | 0 | +0.00039 / 0 |
| 3 – 6 | +13 | +1 | 6.013 | 6.001 | +0.013 | +0.001 | +0.00051 / +0.00004 |
| 6 – 10 | +16 | +1 | 10.016 | 10.001 | +0.016 | +0.001 | +0.00063 / +0.00004 |
| 10 – 14 | +19 | +1 | 14.019 | 14.001 | +0.019 | +0.001 | +0.00075 / +0.00004 |
| 14 – 18 | +19 | +1 | 18.019 | 18.001 | +0.019 | +0.001 | +0.00075 / +0.00004 |
| 18 – 24 | +23 | +2 | 24.023 | 24.002 | +0.023 | +0.002 | +0.00091 / +0.00008 |
| 24 – 30 | +23 | +2 | 30.023 | 30.002 | +0.023 | +0.002 | +0.00091 / +0.00008 |
| 30 – 40 | +27 | +2 | 40.027 | 40.002 | +0.027 | +0.002 | +0.00106 / +0.00008 |
| 40 – 50 | +27 | +2 | 50.027 | 50.002 | +0.027 | +0.002 | +0.00106 / +0.00008 |
| 50 – 65 | +32 | +2 | 65.032 | 65.002 | +0.032 | +0.002 | +0.00126 / +0.00008 |
| 65 – 80 | +32 | +2 | 80.032 | 80.002 | +0.032 | +0.002 | +0.00126 / +0.00008 |
| 80 – 100 | +38 | +3 | 100.038 | 100.003 | +0.038 | +0.003 | +0.00150 / +0.00012 |
| 100 – 120 | +38 | +3 | 120.038 | 120.003 | +0.038 | +0.003 | +0.00150 / +0.00012 |
| 120 – 140 | +43 | +3 | 140.043 | 140.003 | +0.043 | +0.003 | +0.00169 / +0.00012 |
| 140 – 160 | +43 | +3 | 160.043 | 160.003 | +0.043 | +0.003 | +0.00169 / +0.00012 |
| 160 – 180 | +43 | +3 | 180.043 | 180.003 | +0.043 | +0.003 | +0.00169 / +0.00012 |
| 180 – 200 | +50 | +4 | 200.050 | 200.004 | +0.050 | +0.004 | +0.00197 / +0.00016 |
| 200 – 225 | +50 | +4 | 225.050 | 225.004 | +0.050 | +0.004 | +0.00197 / +0.00016 |
| 225 – 250 | +50 | +4 | 250.050 | 250.004 | +0.050 | +0.004 | +0.00197 / +0.00016 |
| 250 – 280 | +56 | +4 | 280.056 | 280.004 | +0.056 | +0.004 | +0.00220 / +0.00016 |
| 280 – 315 | +56 | +4 | 315.056 | 315.004 | +0.056 | +0.004 | +0.00220 / +0.00016 |
| 315 – 355 | +61 | +4 | 355.061 | 355.004 | +0.061 | +0.004 | +0.00240 / +0.00016 |
| 355 – 400 | +61 | +4 | 400.061 | 400.004 | +0.061 | +0.004 | +0.00240 / +0.00016 |
| 400 – 450 | +68 | +5 | 450.068 | 450.005 | +0.068 | +0.005 | +0.00268 / +0.00020 |
| 450 – 500 | +68 | +5 | 500.068 | 500.005 | +0.068 | +0.005 | +0.00268 / +0.00020 |
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 k7
k7 denotes a shaft tolerance zone with transition deviation in the ISO 286 system. It is used in H8/k7 (Coarser transition for general machinery where H7/k6 is unnecessarily accurate.).
At Ø25 mm k7 is +0.023 / +0.002 mm, i.e. 25.002 to 25.023 mm.
How the limits are calculated
k7 uses grade IT7 (a standard tolerance of 21 µm at 18–30 mm). Fundamental deviation: ei is tabulated directly by ISO 286-1 Table 2; es = ei + IT7. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.