H5 tolerance (hole, IT5)
Hole tolerance class H5 per ISO 286-1:2010: fundamental deviation EI = 0, grade IT5 (4 µm at ≤ 3 mm to 27 µm at 400–500 mm). For an exact size, open the calculator with H5 selected.
- Type
- Hole
- Grade
- IT5
- Tolerance
- 4 … 27 µm
- Fund. deviation
- EI = 0
H5 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | +4 | 0 | 3.004 | 3.000 | +0.004 | 0 | +0.00016 / 0 |
| 3 – 6 | +5 | 0 | 6.005 | 6.000 | +0.005 | 0 | +0.00020 / 0 |
| 6 – 10 | +6 | 0 | 10.006 | 10.000 | +0.006 | 0 | +0.00024 / 0 |
| 10 – 14 | +8 | 0 | 14.008 | 14.000 | +0.008 | 0 | +0.00031 / 0 |
| 14 – 18 | +8 | 0 | 18.008 | 18.000 | +0.008 | 0 | +0.00031 / 0 |
| 18 – 24 | +9 | 0 | 24.009 | 24.000 | +0.009 | 0 | +0.00035 / 0 |
| 24 – 30 | +9 | 0 | 30.009 | 30.000 | +0.009 | 0 | +0.00035 / 0 |
| 30 – 40 | +11 | 0 | 40.011 | 40.000 | +0.011 | 0 | +0.00043 / 0 |
| 40 – 50 | +11 | 0 | 50.011 | 50.000 | +0.011 | 0 | +0.00043 / 0 |
| 50 – 65 | +13 | 0 | 65.013 | 65.000 | +0.013 | 0 | +0.00051 / 0 |
| 65 – 80 | +13 | 0 | 80.013 | 80.000 | +0.013 | 0 | +0.00051 / 0 |
| 80 – 100 | +15 | 0 | 100.015 | 100.000 | +0.015 | 0 | +0.00059 / 0 |
| 100 – 120 | +15 | 0 | 120.015 | 120.000 | +0.015 | 0 | +0.00059 / 0 |
| 120 – 140 | +18 | 0 | 140.018 | 140.000 | +0.018 | 0 | +0.00071 / 0 |
| 140 – 160 | +18 | 0 | 160.018 | 160.000 | +0.018 | 0 | +0.00071 / 0 |
| 160 – 180 | +18 | 0 | 180.018 | 180.000 | +0.018 | 0 | +0.00071 / 0 |
| 180 – 200 | +20 | 0 | 200.020 | 200.000 | +0.020 | 0 | +0.00079 / 0 |
| 200 – 225 | +20 | 0 | 225.020 | 225.000 | +0.020 | 0 | +0.00079 / 0 |
| 225 – 250 | +20 | 0 | 250.020 | 250.000 | +0.020 | 0 | +0.00079 / 0 |
| 250 – 280 | +23 | 0 | 280.023 | 280.000 | +0.023 | 0 | +0.00091 / 0 |
| 280 – 315 | +23 | 0 | 315.023 | 315.000 | +0.023 | 0 | +0.00091 / 0 |
| 315 – 355 | +25 | 0 | 355.025 | 355.000 | +0.025 | 0 | +0.00098 / 0 |
| 355 – 400 | +25 | 0 | 400.025 | 400.000 | +0.025 | 0 | +0.00098 / 0 |
| 400 – 450 | +27 | 0 | 450.027 | 450.000 | +0.027 | 0 | +0.00106 / 0 |
| 450 – 500 | +27 | 0 | 500.027 | 500.000 | +0.027 | 0 | +0.00106 / 0 |
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 H5
H5 denotes a hole tolerance zone with zero line deviation in the ISO 286 system.
At Ø25 mm H5 is +0.009 / 0 mm, i.e. 25.000 to 25.009 mm.
How the limits are calculated
H5 uses grade IT5 (a standard tolerance of 9 µm at 18–30 mm). Fundamental deviation: EI = 0: the tolerance zone sits entirely above the nominal size, and IT5 sets its width. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.