k6 tolerance (shaft, IT6)
Shaft tolerance class k6 per ISO 286-1:2010: fundamental deviation ei 0 … +5, grade IT6 (6 µm at ≤ 3 mm to 40 µm at 400–500 mm). For an exact size, open the calculator with k6 selected.
- Type
- Shaft
- Grade
- IT6
- Tolerance
- 6 … 40 µm
- Fund. deviation
- ei 0 … +5 µm
k6 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | +6 | 0 | 3.006 | 3.000 | +0.006 | 0 | +0.00024 / 0 |
| 3 – 6 | +9 | +1 | 6.009 | 6.001 | +0.009 | +0.001 | +0.00035 / +0.00004 |
| 6 – 10 | +10 | +1 | 10.010 | 10.001 | +0.010 | +0.001 | +0.00039 / +0.00004 |
| 10 – 14 | +12 | +1 | 14.012 | 14.001 | +0.012 | +0.001 | +0.00047 / +0.00004 |
| 14 – 18 | +12 | +1 | 18.012 | 18.001 | +0.012 | +0.001 | +0.00047 / +0.00004 |
| 18 – 24 | +15 | +2 | 24.015 | 24.002 | +0.015 | +0.002 | +0.00059 / +0.00008 |
| 24 – 30 | +15 | +2 | 30.015 | 30.002 | +0.015 | +0.002 | +0.00059 / +0.00008 |
| 30 – 40 | +18 | +2 | 40.018 | 40.002 | +0.018 | +0.002 | +0.00071 / +0.00008 |
| 40 – 50 | +18 | +2 | 50.018 | 50.002 | +0.018 | +0.002 | +0.00071 / +0.00008 |
| 50 – 65 | +21 | +2 | 65.021 | 65.002 | +0.021 | +0.002 | +0.00083 / +0.00008 |
| 65 – 80 | +21 | +2 | 80.021 | 80.002 | +0.021 | +0.002 | +0.00083 / +0.00008 |
| 80 – 100 | +25 | +3 | 100.025 | 100.003 | +0.025 | +0.003 | +0.00098 / +0.00012 |
| 100 – 120 | +25 | +3 | 120.025 | 120.003 | +0.025 | +0.003 | +0.00098 / +0.00012 |
| 120 – 140 | +28 | +3 | 140.028 | 140.003 | +0.028 | +0.003 | +0.00110 / +0.00012 |
| 140 – 160 | +28 | +3 | 160.028 | 160.003 | +0.028 | +0.003 | +0.00110 / +0.00012 |
| 160 – 180 | +28 | +3 | 180.028 | 180.003 | +0.028 | +0.003 | +0.00110 / +0.00012 |
| 180 – 200 | +33 | +4 | 200.033 | 200.004 | +0.033 | +0.004 | +0.00130 / +0.00016 |
| 200 – 225 | +33 | +4 | 225.033 | 225.004 | +0.033 | +0.004 | +0.00130 / +0.00016 |
| 225 – 250 | +33 | +4 | 250.033 | 250.004 | +0.033 | +0.004 | +0.00130 / +0.00016 |
| 250 – 280 | +36 | +4 | 280.036 | 280.004 | +0.036 | +0.004 | +0.00142 / +0.00016 |
| 280 – 315 | +36 | +4 | 315.036 | 315.004 | +0.036 | +0.004 | +0.00142 / +0.00016 |
| 315 – 355 | +40 | +4 | 355.040 | 355.004 | +0.040 | +0.004 | +0.00157 / +0.00016 |
| 355 – 400 | +40 | +4 | 400.040 | 400.004 | +0.040 | +0.004 | +0.00157 / +0.00016 |
| 400 – 450 | +45 | +5 | 450.045 | 450.005 | +0.045 | +0.005 | +0.00177 / +0.00020 |
| 450 – 500 | +45 | +5 | 500.045 | 500.005 | +0.045 | +0.005 | +0.00177 / +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 k6
k6 denotes a shaft tolerance zone with transition deviation in the ISO 286 system. It is used in H7/k6 (The standard "push fit" for gears, pulleys and ball-bearing inner rings on shafts; assembles with a light press or mallet, transmits torque only with a key.).
At Ø25 mm k6 is +0.015 / +0.002 mm, i.e. 25.002 to 25.015 mm.
How the limits are calculated
k6 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.