t7 tolerance (shaft, IT7)
Shaft tolerance class t7 per ISO 286-1:2010: fundamental deviation ei +41 … +360, grade IT7 (10 µm at ≤ 3 mm to 63 µm at 400–500 mm). For an exact size, open the calculator with t7 selected.
- Type
- Shaft
- Grade
- IT7
- Tolerance
- 10 … 63 µm
- Fund. deviation
- ei +41 … +360 µm
t7 limits by size range
| Size (mm) | Upper (µm) | Lower (µm) | Ø max (mm) | Ø min (mm) | Upper (mm) | Lower (mm) | Dev. (in) |
|---|---|---|---|---|---|---|---|
| ≤ 3 | — | — | — | — | — | — | — |
| 3 – 6 | — | — | — | — | — | — | — |
| 6 – 10 | — | — | — | — | — | — | — |
| 10 – 14 | — | — | — | — | — | — | — |
| 14 – 18 | — | — | — | — | — | — | — |
| 18 – 24 | — | — | — | — | — | — | — |
| 24 – 30 | +62 | +41 | 30.062 | 30.041 | +0.062 | +0.041 | +0.00244 / +0.00161 |
| 30 – 40 | +73 | +48 | 40.073 | 40.048 | +0.073 | +0.048 | +0.00287 / +0.00189 |
| 40 – 50 | +79 | +54 | 50.079 | 50.054 | +0.079 | +0.054 | +0.00311 / +0.00213 |
| 50 – 65 | +96 | +66 | 65.096 | 65.066 | +0.096 | +0.066 | +0.00378 / +0.00260 |
| 65 – 80 | +105 | +75 | 80.105 | 80.075 | +0.105 | +0.075 | +0.00413 / +0.00295 |
| 80 – 100 | +126 | +91 | 100.126 | 100.091 | +0.126 | +0.091 | +0.00496 / +0.00358 |
| 100 – 120 | +139 | +104 | 120.139 | 120.104 | +0.139 | +0.104 | +0.00547 / +0.00409 |
| 120 – 140 | +162 | +122 | 140.162 | 140.122 | +0.162 | +0.122 | +0.00638 / +0.00480 |
| 140 – 160 | +174 | +134 | 160.174 | 160.134 | +0.174 | +0.134 | +0.00685 / +0.00528 |
| 160 – 180 | +186 | +146 | 180.186 | 180.146 | +0.186 | +0.146 | +0.00732 / +0.00575 |
| 180 – 200 | +212 | +166 | 200.212 | 200.166 | +0.212 | +0.166 | +0.00835 / +0.00654 |
| 200 – 225 | +226 | +180 | 225.226 | 225.180 | +0.226 | +0.180 | +0.00890 / +0.00709 |
| 225 – 250 | +242 | +196 | 250.242 | 250.196 | +0.242 | +0.196 | +0.00953 / +0.00772 |
| 250 – 280 | +270 | +218 | 280.270 | 280.218 | +0.270 | +0.218 | +0.01063 / +0.00858 |
| 280 – 315 | +292 | +240 | 315.292 | 315.240 | +0.292 | +0.240 | +0.01150 / +0.00945 |
| 315 – 355 | +325 | +268 | 355.325 | 355.268 | +0.325 | +0.268 | +0.01280 / +0.01055 |
| 355 – 400 | +351 | +294 | 400.351 | 400.294 | +0.351 | +0.294 | +0.01382 / +0.01157 |
| 400 – 450 | +393 | +330 | 450.393 | 450.330 | +0.393 | +0.330 | +0.01547 / +0.01299 |
| 450 – 500 | +423 | +360 | 500.423 | 500.360 | +0.423 | +0.360 | +0.01665 / +0.01417 |
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 t7
t7 denotes a shaft tolerance zone with heavy interference deviation in the ISO 286 system.
At Ø25 mm t7 is +0.062 / +0.041 mm, i.e. 25.041 to 25.062 mm.
How the limits are calculated
t7 uses grade IT7 (a standard tolerance of 21 µm at 18–30 mm). Fundamental deviation: ei is tabulated directly by ISO 286-1 Table 2; es = ei + IT7. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.