j7 tolerance (shaft, IT7)
Shaft tolerance class j7 per ISO 286-1:2010: fundamental deviation ei −4 … −32, grade IT7 (10 µm at ≤ 3 mm to 63 µm at 400–500 mm). For an exact size, open the calculator with j7 selected.
- Type
- Shaft
- Grade
- IT7
- Tolerance
- 10 … 63 µm
- Fund. deviation
- ei −4 … −32 µm
j7 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | +6 | −4 | 3.006 | 2.996 | +0.006 | −0.004 | +0.00024 / −0.00016 |
| 3 – 6 | +8 | −4 | 6.008 | 5.996 | +0.008 | −0.004 | +0.00031 / −0.00016 |
| 6 – 10 | +10 | −5 | 10.010 | 9.995 | +0.010 | −0.005 | +0.00039 / −0.00020 |
| 10 – 14 | +12 | −6 | 14.012 | 13.994 | +0.012 | −0.006 | +0.00047 / −0.00024 |
| 14 – 18 | +12 | −6 | 18.012 | 17.994 | +0.012 | −0.006 | +0.00047 / −0.00024 |
| 18 – 24 | +13 | −8 | 24.013 | 23.992 | +0.013 | −0.008 | +0.00051 / −0.00031 |
| 24 – 30 | +13 | −8 | 30.013 | 29.992 | +0.013 | −0.008 | +0.00051 / −0.00031 |
| 30 – 40 | +15 | −10 | 40.015 | 39.990 | +0.015 | −0.010 | +0.00059 / −0.00039 |
| 40 – 50 | +15 | −10 | 50.015 | 49.990 | +0.015 | −0.010 | +0.00059 / −0.00039 |
| 50 – 65 | +18 | −12 | 65.018 | 64.988 | +0.018 | −0.012 | +0.00071 / −0.00047 |
| 65 – 80 | +18 | −12 | 80.018 | 79.988 | +0.018 | −0.012 | +0.00071 / −0.00047 |
| 80 – 100 | +20 | −15 | 100.020 | 99.985 | +0.020 | −0.015 | +0.00079 / −0.00059 |
| 100 – 120 | +20 | −15 | 120.020 | 119.985 | +0.020 | −0.015 | +0.00079 / −0.00059 |
| 120 – 140 | +22 | −18 | 140.022 | 139.982 | +0.022 | −0.018 | +0.00087 / −0.00071 |
| 140 – 160 | +22 | −18 | 160.022 | 159.982 | +0.022 | −0.018 | +0.00087 / −0.00071 |
| 160 – 180 | +22 | −18 | 180.022 | 179.982 | +0.022 | −0.018 | +0.00087 / −0.00071 |
| 180 – 200 | +25 | −21 | 200.025 | 199.979 | +0.025 | −0.021 | +0.00098 / −0.00083 |
| 200 – 225 | +25 | −21 | 225.025 | 224.979 | +0.025 | −0.021 | +0.00098 / −0.00083 |
| 225 – 250 | +25 | −21 | 250.025 | 249.979 | +0.025 | −0.021 | +0.00098 / −0.00083 |
| 250 – 280 | +26 | −26 | 280.026 | 279.974 | +0.026 | −0.026 | +0.00102 / −0.00102 |
| 280 – 315 | +26 | −26 | 315.026 | 314.974 | +0.026 | −0.026 | +0.00102 / −0.00102 |
| 315 – 355 | +29 | −28 | 355.029 | 354.972 | +0.029 | −0.028 | +0.00114 / −0.00110 |
| 355 – 400 | +29 | −28 | 400.029 | 399.972 | +0.029 | −0.028 | +0.00114 / −0.00110 |
| 400 – 450 | +31 | −32 | 450.031 | 449.968 | +0.031 | −0.032 | +0.00122 / −0.00126 |
| 450 – 500 | +31 | −32 | 500.031 | 499.968 | +0.031 | −0.032 | +0.00122 / −0.00126 |
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 j7
j7 denotes a shaft tolerance zone with transition deviation in the ISO 286 system.
At Ø25 mm j7 is +0.013 / −0.008 mm, i.e. 24.992 to 25.013 mm.
How the limits are calculated
j7 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.