n6 tolerance (shaft, IT6)
Shaft tolerance class n6 per ISO 286-1:2010: fundamental deviation ei +4 … +40, grade IT6 (6 µm at ≤ 3 mm to 40 µm at 400–500 mm). For an exact size, open the calculator with n6 selected.
- Type
- Shaft
- Grade
- IT6
- Tolerance
- 6 … 40 µm
- Fund. deviation
- ei +4 … +40 µm
n6 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | +10 | +4 | 3.010 | 3.004 | +0.010 | +0.004 | +0.00039 / +0.00016 |
| 3 – 6 | +16 | +8 | 6.016 | 6.008 | +0.016 | +0.008 | +0.00063 / +0.00031 |
| 6 – 10 | +19 | +10 | 10.019 | 10.010 | +0.019 | +0.010 | +0.00075 / +0.00039 |
| 10 – 14 | +23 | +12 | 14.023 | 14.012 | +0.023 | +0.012 | +0.00091 / +0.00047 |
| 14 – 18 | +23 | +12 | 18.023 | 18.012 | +0.023 | +0.012 | +0.00091 / +0.00047 |
| 18 – 24 | +28 | +15 | 24.028 | 24.015 | +0.028 | +0.015 | +0.00110 / +0.00059 |
| 24 – 30 | +28 | +15 | 30.028 | 30.015 | +0.028 | +0.015 | +0.00110 / +0.00059 |
| 30 – 40 | +33 | +17 | 40.033 | 40.017 | +0.033 | +0.017 | +0.00130 / +0.00067 |
| 40 – 50 | +33 | +17 | 50.033 | 50.017 | +0.033 | +0.017 | +0.00130 / +0.00067 |
| 50 – 65 | +39 | +20 | 65.039 | 65.020 | +0.039 | +0.020 | +0.00154 / +0.00079 |
| 65 – 80 | +39 | +20 | 80.039 | 80.020 | +0.039 | +0.020 | +0.00154 / +0.00079 |
| 80 – 100 | +45 | +23 | 100.045 | 100.023 | +0.045 | +0.023 | +0.00177 / +0.00091 |
| 100 – 120 | +45 | +23 | 120.045 | 120.023 | +0.045 | +0.023 | +0.00177 / +0.00091 |
| 120 – 140 | +52 | +27 | 140.052 | 140.027 | +0.052 | +0.027 | +0.00205 / +0.00106 |
| 140 – 160 | +52 | +27 | 160.052 | 160.027 | +0.052 | +0.027 | +0.00205 / +0.00106 |
| 160 – 180 | +52 | +27 | 180.052 | 180.027 | +0.052 | +0.027 | +0.00205 / +0.00106 |
| 180 – 200 | +60 | +31 | 200.060 | 200.031 | +0.060 | +0.031 | +0.00236 / +0.00122 |
| 200 – 225 | +60 | +31 | 225.060 | 225.031 | +0.060 | +0.031 | +0.00236 / +0.00122 |
| 225 – 250 | +60 | +31 | 250.060 | 250.031 | +0.060 | +0.031 | +0.00236 / +0.00122 |
| 250 – 280 | +66 | +34 | 280.066 | 280.034 | +0.066 | +0.034 | +0.00260 / +0.00134 |
| 280 – 315 | +66 | +34 | 315.066 | 315.034 | +0.066 | +0.034 | +0.00260 / +0.00134 |
| 315 – 355 | +73 | +37 | 355.073 | 355.037 | +0.073 | +0.037 | +0.00287 / +0.00146 |
| 355 – 400 | +73 | +37 | 400.073 | 400.037 | +0.073 | +0.037 | +0.00287 / +0.00146 |
| 400 – 450 | +80 | +40 | 450.080 | 450.040 | +0.080 | +0.040 | +0.00315 / +0.00157 |
| 450 – 500 | +80 | +40 | 500.080 | 500.040 | +0.080 | +0.040 | +0.00315 / +0.00157 |
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 n6
n6 denotes a shaft tolerance zone with tight transition deviation in the ISO 286 system. It is used in H7/n6 (Firm fit assembled with a press; parts rarely dismantled, e.g. gear rims on hubs, bushes in housings.).
At Ø25 mm n6 is +0.028 / +0.015 mm, i.e. 25.015 to 25.028 mm.
How the limits are calculated
n6 uses grade IT6 (a standard tolerance of 13 µm at 18–30 mm). Fundamental deviation: ei is tabulated directly by ISO 286-1 Table 2; es = ei + IT6. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.