P6 tolerance (hole, IT6)
Hole tolerance class P6 per ISO 286-1:2010: fundamental deviation ES −6 … −55, grade IT6 (6 µm at ≤ 3 mm to 40 µm at 400–500 mm). For an exact size, open the calculator with P6 selected.
- Type
- Hole
- Grade
- IT6
- Tolerance
- 6 … 40 µm
- Fund. deviation
- ES −6 … −55 µm
P6 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | −6 | −12 | 2.994 | 2.988 | −0.006 | −0.012 | −0.00024 / −0.00047 |
| 3 – 6 | −9 | −17 | 5.991 | 5.983 | −0.009 | −0.017 | −0.00035 / −0.00067 |
| 6 – 10 | −12 | −21 | 9.988 | 9.979 | −0.012 | −0.021 | −0.00047 / −0.00083 |
| 10 – 14 | −15 | −26 | 13.985 | 13.974 | −0.015 | −0.026 | −0.00059 / −0.00102 |
| 14 – 18 | −15 | −26 | 17.985 | 17.974 | −0.015 | −0.026 | −0.00059 / −0.00102 |
| 18 – 24 | −18 | −31 | 23.982 | 23.969 | −0.018 | −0.031 | −0.00071 / −0.00122 |
| 24 – 30 | −18 | −31 | 29.982 | 29.969 | −0.018 | −0.031 | −0.00071 / −0.00122 |
| 30 – 40 | −21 | −37 | 39.979 | 39.963 | −0.021 | −0.037 | −0.00083 / −0.00146 |
| 40 – 50 | −21 | −37 | 49.979 | 49.963 | −0.021 | −0.037 | −0.00083 / −0.00146 |
| 50 – 65 | −26 | −45 | 64.974 | 64.955 | −0.026 | −0.045 | −0.00102 / −0.00177 |
| 65 – 80 | −26 | −45 | 79.974 | 79.955 | −0.026 | −0.045 | −0.00102 / −0.00177 |
| 80 – 100 | −30 | −52 | 99.970 | 99.948 | −0.030 | −0.052 | −0.00118 / −0.00205 |
| 100 – 120 | −30 | −52 | 119.970 | 119.948 | −0.030 | −0.052 | −0.00118 / −0.00205 |
| 120 – 140 | −36 | −61 | 139.964 | 139.939 | −0.036 | −0.061 | −0.00142 / −0.00240 |
| 140 – 160 | −36 | −61 | 159.964 | 159.939 | −0.036 | −0.061 | −0.00142 / −0.00240 |
| 160 – 180 | −36 | −61 | 179.964 | 179.939 | −0.036 | −0.061 | −0.00142 / −0.00240 |
| 180 – 200 | −41 | −70 | 199.959 | 199.930 | −0.041 | −0.070 | −0.00161 / −0.00276 |
| 200 – 225 | −41 | −70 | 224.959 | 224.930 | −0.041 | −0.070 | −0.00161 / −0.00276 |
| 225 – 250 | −41 | −70 | 249.959 | 249.930 | −0.041 | −0.070 | −0.00161 / −0.00276 |
| 250 – 280 | −47 | −79 | 279.953 | 279.921 | −0.047 | −0.079 | −0.00185 / −0.00311 |
| 280 – 315 | −47 | −79 | 314.953 | 314.921 | −0.047 | −0.079 | −0.00185 / −0.00311 |
| 315 – 355 | −51 | −87 | 354.949 | 354.913 | −0.051 | −0.087 | −0.00201 / −0.00343 |
| 355 – 400 | −51 | −87 | 399.949 | 399.913 | −0.051 | −0.087 | −0.00201 / −0.00343 |
| 400 – 450 | −55 | −95 | 449.945 | 449.905 | −0.055 | −0.095 | −0.00217 / −0.00374 |
| 450 – 500 | −55 | −95 | 499.945 | 499.905 | −0.055 | −0.095 | −0.00217 / −0.00374 |
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 P6
P6 denotes a hole tolerance zone with press deviation in the ISO 286 system. It is used in P6/h5 (Shaft-basis equivalent of H6/p5; a firm precision press fit for instrument components located on a common ground shaft.).
At Ø25 mm P6 is −0.018 / −0.031 mm, i.e. 24.969 to 24.982 mm.
How the limits are calculated
P6 uses grade IT6 (a standard tolerance of 13 µm at 18–30 mm). Fundamental deviation: ES = −ei + Δ (Δ = ITn − IT(n−1), applied up to IT8 for K/M/N and IT7 otherwise); IT6 sets the width below ES. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.