R7 tolerance (hole, IT7)
Hole tolerance class R7 per ISO 286-1:2010: fundamental deviation ES −10 … −109, 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
- Hole
- Grade
- IT7
- Tolerance
- 10 … 63 µm
- Fund. deviation
- ES −10 … −109 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 | −10 | −20 | 2.990 | 2.980 | −0.010 | −0.020 | −0.00039 / −0.00079 |
| 3 – 6 | −11 | −23 | 5.989 | 5.977 | −0.011 | −0.023 | −0.00043 / −0.00091 |
| 6 – 10 | −13 | −28 | 9.987 | 9.972 | −0.013 | −0.028 | −0.00051 / −0.00110 |
| 10 – 14 | −16 | −34 | 13.984 | 13.966 | −0.016 | −0.034 | −0.00063 / −0.00134 |
| 14 – 18 | −16 | −34 | 17.984 | 17.966 | −0.016 | −0.034 | −0.00063 / −0.00134 |
| 18 – 24 | −20 | −41 | 23.980 | 23.959 | −0.020 | −0.041 | −0.00079 / −0.00161 |
| 24 – 30 | −20 | −41 | 29.980 | 29.959 | −0.020 | −0.041 | −0.00079 / −0.00161 |
| 30 – 40 | −25 | −50 | 39.975 | 39.950 | −0.025 | −0.050 | −0.00098 / −0.00197 |
| 40 – 50 | −25 | −50 | 49.975 | 49.950 | −0.025 | −0.050 | −0.00098 / −0.00197 |
| 50 – 65 | −30 | −60 | 64.970 | 64.940 | −0.030 | −0.060 | −0.00118 / −0.00236 |
| 65 – 80 | −32 | −62 | 79.968 | 79.938 | −0.032 | −0.062 | −0.00126 / −0.00244 |
| 80 – 100 | −38 | −73 | 99.962 | 99.927 | −0.038 | −0.073 | −0.00150 / −0.00287 |
| 100 – 120 | −41 | −76 | 119.959 | 119.924 | −0.041 | −0.076 | −0.00161 / −0.00299 |
| 120 – 140 | −48 | −88 | 139.952 | 139.912 | −0.048 | −0.088 | −0.00189 / −0.00346 |
| 140 – 160 | −50 | −90 | 159.950 | 159.910 | −0.050 | −0.090 | −0.00197 / −0.00354 |
| 160 – 180 | −53 | −93 | 179.947 | 179.907 | −0.053 | −0.093 | −0.00209 / −0.00366 |
| 180 – 200 | −60 | −106 | 199.940 | 199.894 | −0.060 | −0.106 | −0.00236 / −0.00417 |
| 200 – 225 | −63 | −109 | 224.937 | 224.891 | −0.063 | −0.109 | −0.00248 / −0.00429 |
| 225 – 250 | −67 | −113 | 249.933 | 249.887 | −0.067 | −0.113 | −0.00264 / −0.00445 |
| 250 – 280 | −74 | −126 | 279.926 | 279.874 | −0.074 | −0.126 | −0.00291 / −0.00496 |
| 280 – 315 | −78 | −130 | 314.922 | 314.870 | −0.078 | −0.130 | −0.00307 / −0.00512 |
| 315 – 355 | −87 | −144 | 354.913 | 354.856 | −0.087 | −0.144 | −0.00343 / −0.00567 |
| 355 – 400 | −93 | −150 | 399.907 | 399.850 | −0.093 | −0.150 | −0.00366 / −0.00591 |
| 400 – 450 | −103 | −166 | 449.897 | 449.834 | −0.103 | −0.166 | −0.00406 / −0.00654 |
| 450 – 500 | −109 | −172 | 499.891 | 499.828 | −0.109 | −0.172 | −0.00429 / −0.00677 |
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 hole tolerance zone with press deviation in the ISO 286 system. It is used in R7/h6 (Shaft-basis equivalent of H7/r6.).
At Ø25 mm R7 is −0.020 / −0.041 mm, i.e. 24.959 to 24.980 mm.
How the limits are calculated
R7 uses grade IT7 (a standard tolerance of 21 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); IT7 sets the width below ES. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.