r7 tolerance (shaft, IT7)
Shaft tolerance class r7 per ISO 286-1:2010: fundamental deviation ei +10 … +132, grade IT7 (10 µm at ≤ 3 mm to 63 µm at 400–500 mm). For an exact size, open the calculator with r7 selected.
- Type
- Shaft
- Grade
- IT7
- Tolerance
- 10 … 63 µm
- Fund. deviation
- ei +10 … +132 µm
r7 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | +20 | +10 | 3.020 | 3.010 | +0.020 | +0.010 | +0.00079 / +0.00039 |
| 3 – 6 | +27 | +15 | 6.027 | 6.015 | +0.027 | +0.015 | +0.00106 / +0.00059 |
| 6 – 10 | +34 | +19 | 10.034 | 10.019 | +0.034 | +0.019 | +0.00134 / +0.00075 |
| 10 – 14 | +41 | +23 | 14.041 | 14.023 | +0.041 | +0.023 | +0.00161 / +0.00091 |
| 14 – 18 | +41 | +23 | 18.041 | 18.023 | +0.041 | +0.023 | +0.00161 / +0.00091 |
| 18 – 24 | +49 | +28 | 24.049 | 24.028 | +0.049 | +0.028 | +0.00193 / +0.00110 |
| 24 – 30 | +49 | +28 | 30.049 | 30.028 | +0.049 | +0.028 | +0.00193 / +0.00110 |
| 30 – 40 | +59 | +34 | 40.059 | 40.034 | +0.059 | +0.034 | +0.00232 / +0.00134 |
| 40 – 50 | +59 | +34 | 50.059 | 50.034 | +0.059 | +0.034 | +0.00232 / +0.00134 |
| 50 – 65 | +71 | +41 | 65.071 | 65.041 | +0.071 | +0.041 | +0.00280 / +0.00161 |
| 65 – 80 | +73 | +43 | 80.073 | 80.043 | +0.073 | +0.043 | +0.00287 / +0.00169 |
| 80 – 100 | +86 | +51 | 100.086 | 100.051 | +0.086 | +0.051 | +0.00339 / +0.00201 |
| 100 – 120 | +89 | +54 | 120.089 | 120.054 | +0.089 | +0.054 | +0.00350 / +0.00213 |
| 120 – 140 | +103 | +63 | 140.103 | 140.063 | +0.103 | +0.063 | +0.00406 / +0.00248 |
| 140 – 160 | +105 | +65 | 160.105 | 160.065 | +0.105 | +0.065 | +0.00413 / +0.00256 |
| 160 – 180 | +108 | +68 | 180.108 | 180.068 | +0.108 | +0.068 | +0.00425 / +0.00268 |
| 180 – 200 | +123 | +77 | 200.123 | 200.077 | +0.123 | +0.077 | +0.00484 / +0.00303 |
| 200 – 225 | +126 | +80 | 225.126 | 225.080 | +0.126 | +0.080 | +0.00496 / +0.00315 |
| 225 – 250 | +130 | +84 | 250.130 | 250.084 | +0.130 | +0.084 | +0.00512 / +0.00331 |
| 250 – 280 | +146 | +94 | 280.146 | 280.094 | +0.146 | +0.094 | +0.00575 / +0.00370 |
| 280 – 315 | +150 | +98 | 315.150 | 315.098 | +0.150 | +0.098 | +0.00591 / +0.00386 |
| 315 – 355 | +165 | +108 | 355.165 | 355.108 | +0.165 | +0.108 | +0.00650 / +0.00425 |
| 355 – 400 | +171 | +114 | 400.171 | 400.114 | +0.171 | +0.114 | +0.00673 / +0.00449 |
| 400 – 450 | +189 | +126 | 450.189 | 450.126 | +0.189 | +0.126 | +0.00744 / +0.00496 |
| 450 – 500 | +195 | +132 | 500.195 | 500.132 | +0.195 | +0.132 | +0.00768 / +0.00520 |
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 r7
r7 denotes a shaft tolerance zone with press deviation in the ISO 286 system.
At Ø25 mm r7 is +0.049 / +0.028 mm, i.e. 25.028 to 25.049 mm.
How the limits are calculated
r7 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.