M7 tolerance (hole, IT7)
Hole tolerance class M7 per ISO 286-1:2010: fundamental deviation ES −2 … 0, grade IT7 (10 µm at ≤ 3 mm to 63 µm at 400–500 mm). For an exact size, open the calculator with M7 selected.
- Type
- Hole
- Grade
- IT7
- Tolerance
- 10 … 63 µm
- Fund. deviation
- ES −2 … 0 µm
M7 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | −2 | −12 | 2.998 | 2.988 | −0.002 | −0.012 | −0.00008 / −0.00047 |
| 3 – 6 | 0 | −12 | 6.000 | 5.988 | 0 | −0.012 | 0 / −0.00047 |
| 6 – 10 | 0 | −15 | 10.000 | 9.985 | 0 | −0.015 | 0 / −0.00059 |
| 10 – 14 | 0 | −18 | 14.000 | 13.982 | 0 | −0.018 | 0 / −0.00071 |
| 14 – 18 | 0 | −18 | 18.000 | 17.982 | 0 | −0.018 | 0 / −0.00071 |
| 18 – 24 | 0 | −21 | 24.000 | 23.979 | 0 | −0.021 | 0 / −0.00083 |
| 24 – 30 | 0 | −21 | 30.000 | 29.979 | 0 | −0.021 | 0 / −0.00083 |
| 30 – 40 | 0 | −25 | 40.000 | 39.975 | 0 | −0.025 | 0 / −0.00098 |
| 40 – 50 | 0 | −25 | 50.000 | 49.975 | 0 | −0.025 | 0 / −0.00098 |
| 50 – 65 | 0 | −30 | 65.000 | 64.970 | 0 | −0.030 | 0 / −0.00118 |
| 65 – 80 | 0 | −30 | 80.000 | 79.970 | 0 | −0.030 | 0 / −0.00118 |
| 80 – 100 | 0 | −35 | 100.000 | 99.965 | 0 | −0.035 | 0 / −0.00138 |
| 100 – 120 | 0 | −35 | 120.000 | 119.965 | 0 | −0.035 | 0 / −0.00138 |
| 120 – 140 | 0 | −40 | 140.000 | 139.960 | 0 | −0.040 | 0 / −0.00157 |
| 140 – 160 | 0 | −40 | 160.000 | 159.960 | 0 | −0.040 | 0 / −0.00157 |
| 160 – 180 | 0 | −40 | 180.000 | 179.960 | 0 | −0.040 | 0 / −0.00157 |
| 180 – 200 | 0 | −46 | 200.000 | 199.954 | 0 | −0.046 | 0 / −0.00181 |
| 200 – 225 | 0 | −46 | 225.000 | 224.954 | 0 | −0.046 | 0 / −0.00181 |
| 225 – 250 | 0 | −46 | 250.000 | 249.954 | 0 | −0.046 | 0 / −0.00181 |
| 250 – 280 | 0 | −52 | 280.000 | 279.948 | 0 | −0.052 | 0 / −0.00205 |
| 280 – 315 | 0 | −52 | 315.000 | 314.948 | 0 | −0.052 | 0 / −0.00205 |
| 315 – 355 | 0 | −57 | 355.000 | 354.943 | 0 | −0.057 | 0 / −0.00224 |
| 355 – 400 | 0 | −57 | 400.000 | 399.943 | 0 | −0.057 | 0 / −0.00224 |
| 400 – 450 | 0 | −63 | 450.000 | 449.937 | 0 | −0.063 | 0 / −0.00248 |
| 450 – 500 | 0 | −63 | 500.000 | 499.937 | 0 | −0.063 | 0 / −0.00248 |
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 M7
M7 denotes a hole tolerance zone with tight transition deviation in the ISO 286 system. It is used in M7/h6 (Shaft-basis equivalent of H7/m6.).
At Ø25 mm M7 is 0 / −0.021 mm, i.e. 24.979 to 25.000 mm.
How the limits are calculated
M7 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.