S7 tolerance (hole, IT7)
Hole tolerance class S7 per ISO 286-1:2010: fundamental deviation ES −14 … −229, grade IT7 (10 µm at ≤ 3 mm to 63 µm at 400–500 mm). For an exact size, open the calculator with S7 selected.
- Type
- Hole
- Grade
- IT7
- Tolerance
- 10 … 63 µm
- Fund. deviation
- ES −14 … −229 µm
S7 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | −14 | −24 | 2.986 | 2.976 | −0.014 | −0.024 | −0.00055 / −0.00094 |
| 3 – 6 | −15 | −27 | 5.985 | 5.973 | −0.015 | −0.027 | −0.00059 / −0.00106 |
| 6 – 10 | −17 | −32 | 9.983 | 9.968 | −0.017 | −0.032 | −0.00067 / −0.00126 |
| 10 – 14 | −21 | −39 | 13.979 | 13.961 | −0.021 | −0.039 | −0.00083 / −0.00154 |
| 14 – 18 | −21 | −39 | 17.979 | 17.961 | −0.021 | −0.039 | −0.00083 / −0.00154 |
| 18 – 24 | −27 | −48 | 23.973 | 23.952 | −0.027 | −0.048 | −0.00106 / −0.00189 |
| 24 – 30 | −27 | −48 | 29.973 | 29.952 | −0.027 | −0.048 | −0.00106 / −0.00189 |
| 30 – 40 | −34 | −59 | 39.966 | 39.941 | −0.034 | −0.059 | −0.00134 / −0.00232 |
| 40 – 50 | −34 | −59 | 49.966 | 49.941 | −0.034 | −0.059 | −0.00134 / −0.00232 |
| 50 – 65 | −42 | −72 | 64.958 | 64.928 | −0.042 | −0.072 | −0.00165 / −0.00283 |
| 65 – 80 | −48 | −78 | 79.952 | 79.922 | −0.048 | −0.078 | −0.00189 / −0.00307 |
| 80 – 100 | −58 | −93 | 99.942 | 99.907 | −0.058 | −0.093 | −0.00228 / −0.00366 |
| 100 – 120 | −66 | −101 | 119.934 | 119.899 | −0.066 | −0.101 | −0.00260 / −0.00398 |
| 120 – 140 | −77 | −117 | 139.923 | 139.883 | −0.077 | −0.117 | −0.00303 / −0.00461 |
| 140 – 160 | −85 | −125 | 159.915 | 159.875 | −0.085 | −0.125 | −0.00335 / −0.00492 |
| 160 – 180 | −93 | −133 | 179.907 | 179.867 | −0.093 | −0.133 | −0.00366 / −0.00524 |
| 180 – 200 | −105 | −151 | 199.895 | 199.849 | −0.105 | −0.151 | −0.00413 / −0.00594 |
| 200 – 225 | −113 | −159 | 224.887 | 224.841 | −0.113 | −0.159 | −0.00445 / −0.00626 |
| 225 – 250 | −123 | −169 | 249.877 | 249.831 | −0.123 | −0.169 | −0.00484 / −0.00665 |
| 250 – 280 | −138 | −190 | 279.862 | 279.810 | −0.138 | −0.190 | −0.00543 / −0.00748 |
| 280 – 315 | −150 | −202 | 314.850 | 314.798 | −0.150 | −0.202 | −0.00591 / −0.00795 |
| 315 – 355 | −169 | −226 | 354.831 | 354.774 | −0.169 | −0.226 | −0.00665 / −0.00890 |
| 355 – 400 | −187 | −244 | 399.813 | 399.756 | −0.187 | −0.244 | −0.00736 / −0.00961 |
| 400 – 450 | −209 | −272 | 449.791 | 449.728 | −0.209 | −0.272 | −0.00823 / −0.01071 |
| 450 – 500 | −229 | −292 | 499.771 | 499.708 | −0.229 | −0.292 | −0.00902 / −0.01150 |
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 S7
S7 denotes a hole tolerance zone with heavy interference deviation in the ISO 286 system. It is used in S7/h6 (Shaft-basis equivalent of H7/s6.).
At Ø25 mm S7 is −0.027 / −0.048 mm, i.e. 24.952 to 24.973 mm.
How the limits are calculated
S7 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.