t6 tolerance (shaft, IT6)
Shaft tolerance class t6 per ISO 286-1:2010: fundamental deviation ei +41 … +360, grade IT6 (6 µm at ≤ 3 mm to 40 µm at 400–500 mm). For an exact size, open the calculator with t6 selected.
- Type
- Shaft
- Grade
- IT6
- Tolerance
- 6 … 40 µm
- Fund. deviation
- ei +41 … +360 µm
t6 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 | +54 | +41 | 30.054 | 30.041 | +0.054 | +0.041 | +0.00213 / +0.00161 |
| 30 – 40 | +64 | +48 | 40.064 | 40.048 | +0.064 | +0.048 | +0.00252 / +0.00189 |
| 40 – 50 | +70 | +54 | 50.070 | 50.054 | +0.070 | +0.054 | +0.00276 / +0.00213 |
| 50 – 65 | +85 | +66 | 65.085 | 65.066 | +0.085 | +0.066 | +0.00335 / +0.00260 |
| 65 – 80 | +94 | +75 | 80.094 | 80.075 | +0.094 | +0.075 | +0.00370 / +0.00295 |
| 80 – 100 | +113 | +91 | 100.113 | 100.091 | +0.113 | +0.091 | +0.00445 / +0.00358 |
| 100 – 120 | +126 | +104 | 120.126 | 120.104 | +0.126 | +0.104 | +0.00496 / +0.00409 |
| 120 – 140 | +147 | +122 | 140.147 | 140.122 | +0.147 | +0.122 | +0.00579 / +0.00480 |
| 140 – 160 | +159 | +134 | 160.159 | 160.134 | +0.159 | +0.134 | +0.00626 / +0.00528 |
| 160 – 180 | +171 | +146 | 180.171 | 180.146 | +0.171 | +0.146 | +0.00673 / +0.00575 |
| 180 – 200 | +195 | +166 | 200.195 | 200.166 | +0.195 | +0.166 | +0.00768 / +0.00654 |
| 200 – 225 | +209 | +180 | 225.209 | 225.180 | +0.209 | +0.180 | +0.00823 / +0.00709 |
| 225 – 250 | +225 | +196 | 250.225 | 250.196 | +0.225 | +0.196 | +0.00886 / +0.00772 |
| 250 – 280 | +250 | +218 | 280.250 | 280.218 | +0.250 | +0.218 | +0.00984 / +0.00858 |
| 280 – 315 | +272 | +240 | 315.272 | 315.240 | +0.272 | +0.240 | +0.01071 / +0.00945 |
| 315 – 355 | +304 | +268 | 355.304 | 355.268 | +0.304 | +0.268 | +0.01197 / +0.01055 |
| 355 – 400 | +330 | +294 | 400.330 | 400.294 | +0.330 | +0.294 | +0.01299 / +0.01157 |
| 400 – 450 | +370 | +330 | 450.370 | 450.330 | +0.370 | +0.330 | +0.01457 / +0.01299 |
| 450 – 500 | +400 | +360 | 500.400 | 500.360 | +0.400 | +0.360 | +0.01575 / +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 t6
t6 denotes a shaft tolerance zone with heavy interference deviation in the ISO 286 system. It is used in H7/t6 (Heavier press fit than H7/s6 for permanent shaft-hub joints carrying substantial torque without a key; only defined above 24 mm by ISO 286 — use H7/s6 or H7/u6 below that.).
At Ø25 mm t6 is +0.054 / +0.041 mm, i.e. 25.041 to 25.054 mm.
How the limits are calculated
t6 uses grade IT6 (a standard tolerance of 13 µm at 18–30 mm). Fundamental deviation: ei is tabulated directly by ISO 286-1 Table 2; es = ei + IT6. See the fundamental deviation table for every letter. Values per ISO 286-1:2010.