G7 tolerance (hole, IT7)
Hole tolerance class G7 per ISO 286-1:2010: fundamental deviation EI +2 … +20, grade IT7 (10 µm at ≤ 3 mm to 63 µm at 400–500 mm). For an exact size, open the calculator with G7 selected.
- Type
- Hole
- Grade
- IT7
- Tolerance
- 10 … 63 µm
- Fund. deviation
- EI +2 … +20 µm
G7 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | +12 | +2 | 3.012 | 3.002 | +0.012 | +0.002 | +0.00047 / +0.00008 |
| 3 – 6 | +16 | +4 | 6.016 | 6.004 | +0.016 | +0.004 | +0.00063 / +0.00016 |
| 6 – 10 | +20 | +5 | 10.020 | 10.005 | +0.020 | +0.005 | +0.00079 / +0.00020 |
| 10 – 14 | +24 | +6 | 14.024 | 14.006 | +0.024 | +0.006 | +0.00094 / +0.00024 |
| 14 – 18 | +24 | +6 | 18.024 | 18.006 | +0.024 | +0.006 | +0.00094 / +0.00024 |
| 18 – 24 | +28 | +7 | 24.028 | 24.007 | +0.028 | +0.007 | +0.00110 / +0.00028 |
| 24 – 30 | +28 | +7 | 30.028 | 30.007 | +0.028 | +0.007 | +0.00110 / +0.00028 |
| 30 – 40 | +34 | +9 | 40.034 | 40.009 | +0.034 | +0.009 | +0.00134 / +0.00035 |
| 40 – 50 | +34 | +9 | 50.034 | 50.009 | +0.034 | +0.009 | +0.00134 / +0.00035 |
| 50 – 65 | +40 | +10 | 65.040 | 65.010 | +0.040 | +0.010 | +0.00157 / +0.00039 |
| 65 – 80 | +40 | +10 | 80.040 | 80.010 | +0.040 | +0.010 | +0.00157 / +0.00039 |
| 80 – 100 | +47 | +12 | 100.047 | 100.012 | +0.047 | +0.012 | +0.00185 / +0.00047 |
| 100 – 120 | +47 | +12 | 120.047 | 120.012 | +0.047 | +0.012 | +0.00185 / +0.00047 |
| 120 – 140 | +54 | +14 | 140.054 | 140.014 | +0.054 | +0.014 | +0.00213 / +0.00055 |
| 140 – 160 | +54 | +14 | 160.054 | 160.014 | +0.054 | +0.014 | +0.00213 / +0.00055 |
| 160 – 180 | +54 | +14 | 180.054 | 180.014 | +0.054 | +0.014 | +0.00213 / +0.00055 |
| 180 – 200 | +61 | +15 | 200.061 | 200.015 | +0.061 | +0.015 | +0.00240 / +0.00059 |
| 200 – 225 | +61 | +15 | 225.061 | 225.015 | +0.061 | +0.015 | +0.00240 / +0.00059 |
| 225 – 250 | +61 | +15 | 250.061 | 250.015 | +0.061 | +0.015 | +0.00240 / +0.00059 |
| 250 – 280 | +69 | +17 | 280.069 | 280.017 | +0.069 | +0.017 | +0.00272 / +0.00067 |
| 280 – 315 | +69 | +17 | 315.069 | 315.017 | +0.069 | +0.017 | +0.00272 / +0.00067 |
| 315 – 355 | +75 | +18 | 355.075 | 355.018 | +0.075 | +0.018 | +0.00295 / +0.00071 |
| 355 – 400 | +75 | +18 | 400.075 | 400.018 | +0.075 | +0.018 | +0.00295 / +0.00071 |
| 400 – 450 | +83 | +20 | 450.083 | 450.020 | +0.083 | +0.020 | +0.00327 / +0.00079 |
| 450 – 500 | +83 | +20 | 500.083 | 500.020 | +0.083 | +0.020 | +0.00327 / +0.00079 |
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 G7
G7 denotes a hole tolerance zone with sliding deviation in the ISO 286 system. It is used in G7/h6 (Shaft-basis equivalent of H7/g6 for sliding parts on a ground plain shaft.).
At Ø25 mm G7 is +0.028 / +0.007 mm, i.e. 25.007 to 25.028 mm.
How the limits are calculated
G7 uses grade IT7 (a standard tolerance of 21 µm at 18–30 mm). Fundamental deviation: EI = −es of the same shaft letter; IT7 sets the width above EI. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.